Removed Deprecated Methods

1.18 + Gradle Updates

build.gradle

@@ -3,8 +3,8 @@ import org.apache.tools.ant.filters.ReplaceTokens
 plugins {
     id "java"
     id "maven-publish"
-    id "org.cadixdev.licenser" version "0.6.0"
-    id "com.github.johnrengelman.shadow" version "7.0.0"
+    id "org.cadixdev.licenser" version "0.6.1"
+    id "com.github.johnrengelman.shadow" version "7.1.0"
 }
 
 group "me.clip"
@@ -18,23 +18,22 @@ repositories {
     mavenCentral()
     mavenLocal()
 
-    maven({ url = "https://repo.codemc.org/repository/maven-public" })
+    maven({ url = "https://repo.codemc.org/repository/maven-public/" })
     maven({ url = "https://hub.spigotmc.org/nexus/content/repositories/snapshots/" })
 }
 
 dependencies {
     implementation "org.bstats:bstats-bukkit:2.2.1"
+    implementation "net.kyori:adventure-platform-bukkit:4.0.1"
 
-    implementation "net.kyori:adventure-platform-bukkit:4.0.0-SNAPSHOT"
+    compileOnly "org.spigotmc:spigot-api:1.18-R0.1-SNAPSHOT"
+    compileOnly "org.jetbrains:annotations:22.0.0"
 
-    compileOnly "org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT"
-    compileOnly "org.jetbrains:annotations:19.0.0"
+    testImplementation "org.openjdk.jmh:jmh-core:1.32"
+    testImplementation "org.openjdk.jmh:jmh-generator-annprocess:1.32"
 
-    testImplementation "org.openjdk.jmh:jmh-core:1.23"
-    testImplementation "org.openjdk.jmh:jmh-generator-annprocess:1.23"
-
-    testImplementation "org.junit.jupiter:junit-jupiter-engine:5.6.2"
-    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.6.2"
+    testImplementation "org.junit.jupiter:junit-jupiter-engine:5.8.1"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.8.1"
 }
 
 processResources {

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradlew

@@ -1,7 +1,7 @@
-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright <20> 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,67 +17,101 @@
 #
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions <20>$var<61>, <20>${var}<7D>, <20>${var:-default}<7D>, <20>${var+SET}<7D>,
+#           <20>${var#prefix}<7D>, <20>${var%suffix}<7D>, and <20>$( cmd )<29>;
+#         * compound commands having a testable exit status, especially <20>case<73>;
+#         * various built-in commands including <20>command<6E>, <20>set<65>, and <20>ulimit<69>.
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
+APP_BASE_NAME=${0##*/}
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
@@ -87,9 +121,9 @@ CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -98,7 +132,7 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
+    JAVACMD=java
     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
@@ -106,80 +140,95 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
-fi
-
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
-
-# For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
-    # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
-        fi
-        i=`expr $i + 1`
-    done
-    case $i in
-        0) set -- ;;
-        1) set -- "$args0" ;;
-        2) set -- "$args0" "$args1" ;;
-        3) set -- "$args0" "$args1" "$args2" ;;
-        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
 fi
 
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=`save "$@"`
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
 
 exec "$JAVACMD" "$@"

src/main/java/me/clip/placeholderapi/PlaceholderAPI.java

@@ -22,22 +22,18 @@ package me.clip.placeholderapi;
 
 import com.google.common.collect.ImmutableSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 import me.clip.placeholderapi.expansion.PlaceholderExpansion;
 import me.clip.placeholderapi.expansion.Relational;
-import me.clip.placeholderapi.expansion.manager.LocalExpansionManager;
 import me.clip.placeholderapi.replacer.CharsReplacer;
 import me.clip.placeholderapi.replacer.Replacer;
 import me.clip.placeholderapi.replacer.Replacer.Closure;
 import me.clip.placeholderapi.util.Msg;
 import org.bukkit.OfflinePlayer;
 import org.bukkit.entity.Player;
-import org.bukkit.plugin.Plugin;
-import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
 public final class PlaceholderAPI {
@@ -288,335 +284,4 @@ public final class PlaceholderAPI {
   public static boolean containsBracketPlaceholders(String text) {
     return text != null && BRACKET_PLACEHOLDER_PATTERN.matcher(text).find();
   }
-
-  // === Deprecated API ===
-
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean registerExpansion(PlaceholderExpansion expansion)
-  {
-    return expansion.register();
-  }
-
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean unregisterExpansion(PlaceholderExpansion expansion)
-  {
-    return expansion.unregister();
-  }
-
-  /**
-   * Get map of registered placeholders
-   * 
-   * @deprecated Use {@link LocalExpansionManager#getExpansions()} instead.
-   *
-   * @return Map of registered placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static Map<String, PlaceholderHook> getPlaceholders() {
-    return PlaceholderAPIPlugin.getInstance().getLocalExpansionManager()
-        .getExpansions().stream()
-        .collect(Collectors.toMap(PlaceholderExpansion::getIdentifier, ex -> ex));
-  }
-
-  /**
-   * @deprecated Please use {@link PlaceholderExpansion} to
-   * register placeholders instead
-   * 
-   * @param plugin The Plugin to register with this {@link PlaceholderHook}
-   * @param placeholderHook The {@link PlaceholderHook} to register
-   * @return always false
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean registerPlaceholderHook(Plugin plugin, PlaceholderHook placeholderHook) {
-    PlaceholderAPIPlugin.getInstance().getLogger().warning(plugin.getName()
-        + " is attempting to register placeholders via a PlaceholderHook class which is no longer supported!"
-        + " Please reach out to " + plugin.getDescription().getAuthors().toString()
-        + " and let them know that they need to update ASAP!");
-    return false;
-  }
-
-  /**
-   * @deprecated Please use {@link PlaceholderExpansion} to
-   * register placeholders instead
-   * 
-   * @param identifier The identifier to use for the {@link PlaceholderHook}
-   * @param placeholderHook The {@link PlaceholderHook} to register
-   * @return always false
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean registerPlaceholderHook(String identifier,
-      PlaceholderHook placeholderHook) {
-    PlaceholderAPIPlugin.getInstance().getLogger().warning(identifier
-        + " is attempting to register placeholders via a PlaceholderHook class which is no longer supported!");
-    return false;
-  }
-
-  /**
-   * @deprecated Please use {@link PlaceholderExpansion} to
-   * unregister placeholders instead
-   * 
-   * @param plugin The plugin to unregister
-   * @return always false
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean unregisterPlaceholderHook(Plugin plugin) {
-    PlaceholderAPIPlugin.getInstance().getLogger().warning(plugin.getName()
-        + " is attempting to unregister placeholders via the PlaceholderAPI class which is no longer supported!"
-        + " Please reach out to " + plugin.getDescription().getAuthors().toString()
-        + " and let them know that they need to update ASAP!");
-    return false;
-  }
-
-  /**
-   * @deprecated Please use {@link PlaceholderExpansion} to
-   * unregister placeholders instead
-   * 
-   * @param identifier The identifier to unregister
-   * @return always false
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static boolean unregisterPlaceholderHook(String identifier) {
-    PlaceholderAPIPlugin.getInstance().getLogger().warning(identifier
-        + " is attempting to unregister placeholders through the PlaceholderAPI class which is no longer supported!");
-    return false;
-  }
-
-  /**
-   * @deprecated Will be removed in a future release.
-   * 
-   * @return Set of registered identifiers
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static Set<String> getRegisteredPlaceholderPlugins() {
-    return getRegisteredIdentifiers();
-  }
-
-  /**
-   * @deprecated Will be removed in a future release.
-   * 
-   * @return always null
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static Set<String> getExternalPlaceholderPlugins() {
-    return null;
-  }
-
-  /**
-   * @deprecated Please use {@link #setPlaceholders(OfflinePlayer, String)} instead
-   * 
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param pattern The Pattern to use
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setPlaceholders(OfflinePlayer player,
-      String text, Pattern pattern, boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Please use {@link #setPlaceholders(OfflinePlayer, List)} instead
-   * 
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param pattern The Pattern to use
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setPlaceholders(OfflinePlayer player,
-      List<String> text, Pattern pattern, boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, List)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setPlaceholders(OfflinePlayer player, List<String> text,
-      boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, List)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param pattern The Pattern to use
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setPlaceholders(OfflinePlayer player, List<String> text,
-      Pattern pattern) {
-    return setPlaceholders(player, text);
-  }
-  /**
-   * @deprecated Will be removed in a future release.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setPlaceholders(Player player, String text, boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Will be removed in a future release.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setPlaceholders(Player player, List<String> text, boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, String)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setPlaceholders(OfflinePlayer player, String text, boolean colorize) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, String)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param pattern The Pattern to use
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setPlaceholders(OfflinePlayer player, String text, Pattern pattern) {
-    return setPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, List)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setBracketPlaceholders(OfflinePlayer player, List<String> text,
-      boolean colorize) {
-    return setBracketPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, String)} instead.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setBracketPlaceholders(OfflinePlayer player, String text, boolean colorize) {
-    return setBracketPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Will be removed in a future release.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setBracketPlaceholders(Player player, String text, boolean colorize) {
-    return setBracketPlaceholders(player, text);
-  }
-
-  /**
-   * @deprecated Will be removed in a future release.
-   *
-   * @param player The offline player to parse the placeholders against
-   * @param text The List of text to parse
-   * @param colorize If PlaceholderAPI should also parse color codes
-   * @return String with the parsed placeholders
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setBracketPlaceholders(Player player, List<String> text,
-      boolean colorize) {
-    return setBracketPlaceholders(player, text);
-  }
-
-  /**
-   * set relational placeholders in the text specified placeholders are matched with the pattern
-   * {@literal %<rel_(identifier)_(params)>%} when set with this method
-   *
-   * @param one Player to compare
-   * @param two Player to compare
-   * @param text Text to parse the placeholders in
-   * @param colorize If color codes ({@literal &[0-1a-fk-o]}) should be translated
-   * @return The text containing the parsed relational placeholders
-   * @deprecated Use {@link #setPlaceholders(OfflinePlayer, String)} instead.
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static String setRelationalPlaceholders(Player one, Player two, String text,
-      boolean colorize) {
-    return setRelationalPlaceholders(one, two, text);
-  }
-
-  /**
-   * Translate placeholders in the provided list based on the relation of the two provided players.
-   * <br>The pattern of a valid placeholder is {@literal %rel_<identifier>_<params>%}.
-   *
-   * @param one First player to compare
-   * @param two Second player to compare
-   * @param text Text to parse the placeholders in
-   * @param colorize If color codes ({@literal &[0-1a-fk-o]}) should be translated
-   * @return The text containing the parsed relational placeholders
-   * @deprecated Use {@link #setRelationalPlaceholders(Player, Player, List)} instead.
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public static List<String> setRelationalPlaceholders(Player one, Player two, List<String> text,
-      boolean colorize) {
-    return setRelationalPlaceholders(one, two, text);
-  }
 }

src/main/java/me/clip/placeholderapi/events/ExpansionRegisterEvent.java

@@ -27,8 +27,11 @@ import org.bukkit.event.HandlerList;
 import org.jetbrains.annotations.NotNull;
 
 /**
- * Indicates that a {@link PlaceholderExpansion} has been registered by
- * PlaceholderAPI.
+ * This event indicates that a <b>single</b> {@link PlaceholderExpansion PlaceholderExpansion} has
+ * been registered in PlaceholderAPI.
+ * 
+ * <p>To know when <b>all</b> Expansions have been registered, use the
+ * {@link me.clip.placeholderapi.events.ExpansionsLoadedEvent ExpansionsLoadedEvent} instead.
  */
 public final class ExpansionRegisterEvent extends Event implements Cancellable {
 
@@ -48,15 +51,25 @@ public final class ExpansionRegisterEvent extends Event implements Cancellable {
   }
   
   /**
-   * The {@link PlaceholderExpansion expansion} that was registered.
+   * The {@link PlaceholderExpansion PlaceholderExpansion} that was registered in PlaceholderAPI.
+   * <br>The PlaceholderExpansion will be available for use when the event
+   * {@link #isCancelled() was not cancelled}!
    * 
-   * @return The {@link PlaceholderExpansion} instance.
+   * @return Current instance of the registered {@link PlaceholderExpansion PlaceholderExpansion}
    */
   @NotNull
   public PlaceholderExpansion getExpansion() {
     return expansion;
   }
 
+  /**
+   * Indicates if this event was cancelled or not.
+   * <br>A cancelled Event will result in the {@link #getExpansion() PlaceholderExpansion} NOT
+   * being added to PlaceholderAPI's internal list and will therefore be considered not registered
+   * anymore.
+   * 
+   * @return Whether the event has been cancelled or not.
+   */
   @Override
   public boolean isCancelled() {
     return cancelled;

src/main/java/me/clip/placeholderapi/events/ExpansionUnregisterEvent.java

@@ -26,15 +26,19 @@ import org.bukkit.event.HandlerList;
 import org.jetbrains.annotations.NotNull;
 
 /**
- * Indicates that a {@link PlaceholderExpansion} had been unregistered by
- * PlaceholderAPI.
+ * This event indicates that a {@link PlaceholderExpansion PlaceholderExpansion} has been
+ * unregistered by PlaceholderAPI.
+ * 
+ * <p>Note that this event is triggered <b>before</b> the PlaceholderExpansion is completely
+ * removed.
+ * <br>This includes removing any Listeners, stopping active tasks and clearing the cache of
+ * the PlaceholderExpansion.
  */
 public final class ExpansionUnregisterEvent extends Event {
 
   @NotNull
   private static final HandlerList HANDLERS = new HandlerList();
-
-
+  
   @NotNull
   private final PlaceholderExpansion expansion;
 
@@ -48,9 +52,9 @@ public final class ExpansionUnregisterEvent extends Event {
   }
   
   /**
-   * The {@link PlaceholderExpansion expansion} that was unregistered.
+   * The {@link PlaceholderExpansion PlaceholderExpansion} that was unregistered.
    * 
-   * @return The {@link PlaceholderExpansion} instance.
+   * @return The {@link PlaceholderExpansion PlaceholderExpansion} instance.
    */
   @NotNull
   public PlaceholderExpansion getExpansion() {

src/main/java/me/clip/placeholderapi/events/ExpansionsLoadedEvent.java

@@ -21,18 +21,42 @@
 package me.clip.placeholderapi.events;
 
 
+import java.util.Collections;
+import java.util.List;
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
 import org.bukkit.event.Event;
 import org.bukkit.event.HandlerList;
 import org.jetbrains.annotations.NotNull;
 
 /**
- * Indicates that <b>all</b> {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlayceholderExpansions}
- * have been loaded.
- * <br/>This event is fired on Server load and when reloading the
- * confiuration.
+ * This event indicated that <b>all</b> {@link PlaceholderExpansion PlaceholderExpansions} have
+ * been registered in PlaceholderAPI and can now be used.
+ * <br>This even will also be triggered whenever PlaceholderAPI gets reloaded.
+ * 
+ * <p>All PlaceholderExpansions, except for those loaded by plugins, are loaded
+ * after Spigot triggered its ServerLoadEvent (1.13+), or after PlaceholderAPI has been enabled.
  */
 public class ExpansionsLoadedEvent extends Event {
+    
+    private final List<PlaceholderExpansion> expansions;
+    
+    public ExpansionsLoadedEvent(List<PlaceholderExpansion> expansions) {
+        this.expansions = Collections.unmodifiableList(expansions);
+    }
 
+    /**
+     * Returns a unmodifiable list of {@link PlaceholderExpansion PlaceholderExpansions} that
+     * have been registered by PlaceholderAPI.
+     * 
+     * <p><b>This list does not include manually registered PlaceholderExpansions.</b>
+     * 
+     * @return List of {@link PlaceholderExpansion registered PlaceholderExpansions}.
+     */
+    @NotNull
+    public final List<PlaceholderExpansion> getExpansions(){
+        return expansions;
+    }
+    
     @NotNull
     private static final HandlerList HANDLERS = new HandlerList();
 

src/main/java/me/clip/placeholderapi/expansion/Cacheable.java

@@ -21,9 +21,11 @@
 package me.clip.placeholderapi.expansion;
 
 /**
- * This interface allows a class which extends a {@link PlaceholderExpansion} to have the clear
- * method called when the implementing expansion is unregistered from PlaceholderAPI. This is useful
- * if we want to do things when the implementing hook is unregistered
+ * Classes implementing this interface will have a {@link #clear() clear void} that is called
+ * by PlaceholderAPI whenever the {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion}
+ * is unregistered.
+ * 
+ * <p>This allows you to execute things such as clearing internal caches, saving data to files, etc.
  *
  * @author Ryan McCarthy
  */

src/main/java/me/clip/placeholderapi/expansion/Cleanable.java

@@ -23,9 +23,11 @@ package me.clip.placeholderapi.expansion;
 import org.bukkit.entity.Player;
 
 /**
- * This interface allows a class which extends a {@link PlaceholderExpansion} to have the cleanup
- * method called every time a player leaves the server. This is useful if we want to clean up after
- * the player
+ * Classes implementing this interface will have a {@link #cleanup(Player) cleanup void} that is
+ * called by PlaceholderAPI whenever a Player leaves the server.
+ * 
+ * <p>This can be useful for cases where you keep data of the player in a cache or similar
+ * and want to free up space whenever they leave.
  *
  * @author Ryan McCarthy
  */

src/main/java/me/clip/placeholderapi/expansion/Configurable.java

@@ -23,18 +23,32 @@ package me.clip.placeholderapi.expansion;
 import java.util.Map;
 
 /**
- * Any {@link PlaceholderExpansion} class which implements configurable will have any options listed
- * in the {@link #getDefaults()} map automatically added to the PlaceholderAPI config.yml file
+ * Implementing this interface allows {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansions}
+ * to set a list of default configuration values through the {@link #getDefaults() getDefaults method}
+ * that should be added to the config.yml of PlaceholderAPI.
+ * 
+ * <p>The entries will be added under {@code expansions} as their own section.
+ * <h2>Example:</h2>
+ * returning a Map with key {@code foo} and value {@code bar} will result in the following config entry:
+ * 
+ * <pre><code>
+ * expansions:
+ *   myexpansion:
+ *     foo: "bar"
+ * </code></pre>
+ * 
+ * <p><b>The configuration is set before the PlaceholderExpansion is registered!</b>
  *
  * @author Ryan McCarthy
  */
 public interface Configurable {
 
   /**
-   * This method will be called before the implementing class is registered to obtain a map of
-   * configuration options that the implementing class needs These paths and values will be added to
-   * the PlaceholderAPI config.yml in the configuration section expansions.(placeholder
-   * identifier).(your key): (your value)
+   * The map returned by this method will be used to set config options in PlaceholderAPI's config.yml.
+   * 
+   * <p>The key and value pairs are set under a section named after your
+   * {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion} in the
+   * {@code expansions} section of the config.
    *
    * @return Map of config path / values which need to be added / removed from the PlaceholderAPI
    * config.yml file

src/main/java/me/clip/placeholderapi/expansion/NMSVersion.java

@@ -42,7 +42,8 @@ public enum NMSVersion {
   SPIGOT_1_16_R1("v1_16_R1"),
   SPIGOT_1_16_R2("v1_16_R2"),
   SPIGOT_1_16_R3("v1_16_R3"),
-  SPIGOT_1_17_R1("v1_17_R1");
+  SPIGOT_1_17_R1("v1_17_R1"),
+  SPIGOT_1_18_R1("v1_18_R1");
 
   private final String version;
 

src/main/java/me/clip/placeholderapi/expansion/PlaceholderExpansion.java

@@ -22,11 +22,11 @@ package me.clip.placeholderapi.expansion;
 
 import java.util.Collections;
 import java.util.List;
+import java.util.logging.Level;
 import me.clip.placeholderapi.PlaceholderAPIPlugin;
 import me.clip.placeholderapi.PlaceholderHook;
 import org.bukkit.Bukkit;
 import org.bukkit.configuration.ConfigurationSection;
-import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -81,7 +81,7 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    */
   @Nullable
   public String getRequiredPlugin() {
-    return getPlugin();
+    return null;
   }
 
   /**
@@ -275,7 +275,6 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
    * @param def The default boolean to return when the ConfigurationSection is null
    * @return boolean from the provided path or the default one provided
    */
-  @NotNull
   public final boolean getBoolean(@NotNull final String path, final boolean def) {
     final ConfigurationSection section = getConfigSection();
     return section == null ? def : section.getBoolean(path, def);
@@ -293,6 +292,71 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
     final ConfigurationSection section = getConfigSection();
     return section != null && section.contains(path);
   }
+
+  /**
+   * Logs the provided message with the provided Level in the console.
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   * 
+   * @param level The Level at which the message should be logged with
+   * @param msg The message to log
+   */
+  public void log(Level level, String msg) {
+    getPlaceholderAPI().getLogger().log(level, "[" + getName() + "] " + msg);
+  }
+
+  /**
+   * Logs the provided message and Throwable with the provided Level in the console.
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   *
+   * @param level The Level at which the message should be logged with
+   * @param msg The message to log
+   * @param throwable The Throwable to log
+   */
+  public void log(Level level, String msg, Throwable throwable) {
+    getPlaceholderAPI().getLogger().log(level, "[" + getName() + "] " + msg, throwable);
+  }
+
+  /**
+   * Logs the provided message with Level "info".
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   *
+   * @param msg The message to log
+   */
+  public void info(String msg) {
+    log(Level.INFO, msg);
+  }
+
+  /**
+   * Logs the provided message with Level "warning".
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   *
+   * @param msg The message to log
+   */
+  public void warning(String msg) {
+    log(Level.WARNING, msg);
+  }
+
+  /**
+   * Logs the provided message with Level "severe" (error).
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   *
+   * @param msg The message to log
+   */
+  public void severe(String msg) {
+    log(Level.SEVERE, msg);
+  }
+
+  /**
+   * Logs the provided message and Throwable with Level "severe" (error).
+   * <br>The message will be prefixed with {@link #getName() <code>[&lt;expansion name&gt;]</code>}
+   *
+   * @param msg The message to log
+   * @param throwable The Throwable to log
+   */
+  public void severe(String msg, Throwable throwable) {
+    log(Level.SEVERE, msg, throwable);
+  }
+  
   
   /**
    * Whether the provided Object is an instance of this PlaceholderExpansion.
@@ -332,39 +396,4 @@ public abstract class PlaceholderExpansion extends PlaceholderHook {
     return String.format("PlaceholderExpansion[name: '%s', author: '%s', version: '%s']", getName(),
         getAuthor(), getVersion());
   }
-
-  // === Deprecated API ===
-
-  /**
-   * @deprecated As of versions greater than 2.8.7, use {@link #getRequiredPlugin()}
-   *
-   * @return The plugin name.
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public String getPlugin() {
-    return null;
-  }
-
-  /**
-   * @deprecated As of versions greater than 2.8.7, use the expansion cloud to show a description
-   *
-   * @return The description of the expansion.
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public String getDescription() {
-    return null;
-  }
-
-  /**
-   * @deprecated As of versions greater than 2.8.7, use the expansion cloud to display a link
-   *
-   * @return The link for the expansion.
-   */
-  @Deprecated
-  @ApiStatus.ScheduledForRemoval(inVersion = "2.11.0")
-  public String getLink() {
-    return null;
-  }
 }

src/main/java/me/clip/placeholderapi/expansion/Relational.java

@@ -22,7 +22,22 @@ package me.clip.placeholderapi.expansion;
 
 import org.bukkit.entity.Player;
 
+/**
+ * Implementing this interface allows your {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion}
+ * to be used as a relational placeholder expansion.
+ * 
+ * <p>Relational placeholders take two Players as input and are always prefixed with {@code rel_},
+ * so {@code %foo_bar%} becomes {@code %rel_foo_bar%}
+ */
 public interface Relational {
 
+  /**
+   * This method is called whenever a placeholder starting with {@code rel_} is called.
+   * 
+   * @param one The first player used for the placeholder.
+   * @param two The second player used for the placeholder.
+   * @param identifier The text right after the expansion's name (%expansion_<b>identifier</b>%)
+   * @return Parsed String from the expansion.
+   */
   String onPlaceholderRequest(Player one, Player two, String identifier);
 }

src/main/java/me/clip/placeholderapi/expansion/Taskable.java

@@ -20,18 +20,24 @@
 
 package me.clip.placeholderapi.expansion;
 
-
+/**
+ * Implementing this interface adds the {@link #start() start} and {@link #stop() stop} void
+ * methods to your {@link me.clip.placeholderapi.expansion.PlaceholderExpansion PlaceholderExpansion}.
+ * 
+ * <p>This can be used to execute methods and tasks whenever the PlaceholderExpansion has been
+ * successfully (un)registered.
+ */
 public interface Taskable {
 
   /**
-   * Called when the implementing class has successfully been registered to the placeholder map
-   * Tasks that need to be performed when this expansion is registered should go here
+   * Called when the implementing class has successfully been registered to the placeholder map.
+   * <br>Tasks that need to be performed when this expansion is registered should go here
    */
   void start();
 
   /**
-   * Called when the implementing class has been unregistered from PlaceholderAPI Tasks that need to
-   * be performed when this expansion has unregistered should go here
+   * Called when the implementing class has been unregistered from PlaceholderAPI.
+   * <br>Tasks that need to be performed when this expansion has unregistered should go here
    */
   void stop();
 }

src/main/java/me/clip/placeholderapi/expansion/manager/LocalExpansionManager.java

@@ -160,7 +160,11 @@ public final class LocalExpansionManager implements Listener {
       @NotNull final Class<? extends PlaceholderExpansion> clazz) {
     try {
       final PlaceholderExpansion expansion = createExpansionInstance(clazz);
-
+      
+      if(expansion == null){
+        return Optional.empty();
+      }
+      
       Objects.requireNonNull(expansion.getAuthor(), "The expansion author is null!");
       Objects.requireNonNull(expansion.getIdentifier(), "The expansion identifier is null!");
       Objects.requireNonNull(expansion.getVersion(), "The expansion version is null!");
@@ -259,7 +263,8 @@ public final class LocalExpansionManager implements Listener {
       Bukkit.getPluginManager().registerEvents(((Listener) expansion), plugin);
     }
 
-    plugin.getLogger().info("Successfully registered expansion: " + expansion.getIdentifier());
+    plugin.getLogger().info("Successfully registered expansion: " + expansion.getIdentifier() + 
+        " [" + expansion.getVersion() + "]");
 
     if (expansion instanceof Taskable) {
       ((Taskable) expansion).start();
@@ -319,18 +324,37 @@ public final class LocalExpansionManager implements Listener {
         plugin.getLogger().log(Level.SEVERE, "failed to load class files of expansions", exception);
         return;
       }
-
-      final long registered = classes.stream()
+      
+      final List<PlaceholderExpansion> registered = classes.stream()
           .filter(Objects::nonNull)
           .map(this::register)
           .filter(Optional::isPresent)
+          .map(Optional::get)
+          .collect(Collectors.toList());
+
+      final long needsUpdate = registered.stream()
+          .map(expansion -> plugin.getCloudExpansionManager().findCloudExpansionByName(expansion.getName()).orElse(null))
+          .filter(Objects::nonNull)
+          .filter(CloudExpansion::shouldUpdate)
           .count();
 
-      Msg.msg(sender,
-          registered == 0 ? "&6No expansions were registered!"
-              : registered + "&a placeholder hooks successfully registered!");
+      StringBuilder message = new StringBuilder(registered.size() == 0 ? "&6" : "&a")
+          .append(registered.size())
+          .append(' ')
+          .append("placeholder hook(s) registered!");
+      
+      if (needsUpdate > 0) {
+        message.append(' ')
+            .append("&6")
+            .append(needsUpdate)
+            .append(' ')
+            .append("placeholder hook(s) have an update available.");
+      }
+      
+      
+      Msg.msg(sender, message.toString());
 
-      Bukkit.getPluginManager().callEvent(new ExpansionsLoadedEvent());
+      Bukkit.getPluginManager().callEvent(new ExpansionsLoadedEvent(registered));
     });
   }
 
@@ -346,7 +370,12 @@ public final class LocalExpansionManager implements Listener {
 
   @NotNull
   public CompletableFuture<@NotNull List<@Nullable Class<? extends PlaceholderExpansion>>> findExpansionsOnDisk() {
-    return Arrays.stream(folder.listFiles((dir, name) -> name.endsWith(".jar")))
+    File[] files = folder.listFiles((dir, name) -> name.endsWith(".jar"));
+    if(files == null){
+      return CompletableFuture.completedFuture(Collections.emptyList());
+    }
+    
+    return Arrays.stream(files)
         .map(this::findExpansionInFile)
         .collect(Futures.collector());
   }