Generate listener manager methods into own interfaces

build.gradle

@@ -96,5 +96,6 @@ apply from: 'gradle/jars.gradle'
 apply from: 'gradle/java9.gradle'
 apply from: 'gradle/tests.gradle'
 apply from: 'gradle/javadoc.gradle'
+apply from: 'gradle/listener-manager-generation.gradle'
 apply from: 'gradle/readme.gradle'
 apply from: 'gradle/publishing.gradle'

config/checkstyle/suppressions.xml

@@ -1,9 +1,11 @@
 <?xml version="1.0"?>
 
 <!DOCTYPE suppressions PUBLIC
-        "-//Puppy Crawl//DTD Suppressions 1.1//EN"
-        "http://checkstyle.sourceforge.net/dtds/suppressions_1_1.dtd">
+        "-//Puppy Crawl//DTD Suppressions 1.2//EN"
+        "http://checkstyle.sourceforge.net/dtds/suppressions_1_2.dtd">
 
 <suppressions>
     <suppress id="finalizer" files=".*[\\/]DiscordApiImpl.java$" />
+    <suppress checks="LineLength|CustomImportOrder|OverloadMethodsDeclarationOrder|Indentation"
+              files="[\\/]build[\\/][^\\/]+[\\/]generated[\\/]" />
 </suppressions>

gradle/dependencies.gradle

@@ -11,6 +11,14 @@ allprojects {
     }
 }
 
+project(':javacord-api') {
+    dependencies {
+        // For old Generated annotation in Java 9
+        // can be replaced by javax.annotation.processing.Generated if Java 9 is minimum requirement
+        compileOnly 'javax.annotation:javax.annotation-api:1.3.2'
+    }
+}
+
 project(':javacord-core') {
     dependencies {
         // OkHttp for REST-calls

gradle/java9.gradle

@@ -21,7 +21,8 @@ buildscript {
 
 if (JavaVersion.current().java9Compatible) {
     subprojects {
-        task compileJava9(type: JavaCompile, dependsOn: sourceSets.main.runtimeClasspath) {
+        task compileJava9(type: JavaCompile, dependsOn: [sourceSets.main.compileClasspath,
+                                                         sourceSets.main.runtimeClasspath]) {
             description 'Compiles main Java 9 source'
             source sourceSets.main.java
             source 'src/main/java9/'
@@ -33,7 +34,7 @@ if (JavaVersion.current().java9Compatible) {
                 // access SourceDirectorySet#asPath in afterEvaluate
                 // or projects get evaluated before all configuration is done
                 options.compilerArgs << '--module-path'
-                options.compilerArgs << sourceSets.main.runtimeClasspath.asPath
+                options.compilerArgs << (sourceSets.main.compileClasspath + sourceSets.main.runtimeClasspath).asPath
             }
         }
 
@@ -49,6 +50,11 @@ if (JavaVersion.current().java9Compatible) {
     }
 
     project(':javacord-api') {
+        compileJava9 {
+            options.compilerArgs << '--add-modules' << 'java.annotation'
+            options.compilerArgs << '--add-reads' << 'org.javacord.api=java.annotation'
+        }
+
         task generateModuleInfo {
             ext.outputDirectory = "$buildDir/generated/module-info"