Fix Signatures URLs added to any task are actually applied to all tasks

src/main/java/de/thetaphi/forbiddenapis/gradle/CheckForbiddenApis.java

@@ -121,6 +121,11 @@ public class CheckForbiddenApis extends DefaultTask implements PatternFilterable
   private FileCollection classpath;
   private String targetCompatibility;
 
+  /** Gives access to internal data of plugin to plugin-init.groovy */
+  CheckForbiddenApisExtension internalTaskData() {
+    return data;
+  }
+
   /**
    * Directories with the class files to check.
    * Defaults to current sourseSet's output directory (Gradle 3) or output directories (Gradle 4.0+).

src/main/java/de/thetaphi/forbiddenapis/gradle/ForbiddenApisPlugin.java

@@ -102,7 +102,7 @@ public Class<? extends DelegatingScript> run() {
               loader.parseClass(csrc, false).asSubclass(DelegatingScript.class);
           return clazz;
         } catch (Exception e) {
-          throw new RuntimeException("Cannot compile Groovy script: " + PLUGIN_INIT_SCRIPT);
+          throw new RuntimeException("Cannot compile Groovy script: " + PLUGIN_INIT_SCRIPT, e);
         }
       }
     });

src/main/resources/de/thetaphi/forbiddenapis/gradle/plugin-init.groovy

@@ -17,6 +17,7 @@
 /** Initializes the plugin and binds it to project lifecycle. */
 
 import org.gradle.api.plugins.JavaBasePlugin;
+import org.gradle.api.file.ConfigurableFileCollection;
 
 project.plugins.apply(JavaBasePlugin.class);
 
@@ -43,12 +44,24 @@ project.sourceSets.all{ sourceSet ->
     description = "Runs forbidden-apis checks on '${sourceSet.name}' classes.";
     dependsOn(sourceSet.output);
     outputs.upToDateWhen { true }
+    def taskData = internalTaskData()
     conventionMapping.with{
       FORBIDDEN_APIS_EXTENSION_PROPS.each{ key ->
-        map(key, { extension[key] });
+        map(key, { 
+          def item = taskData[key]
+          if (item instanceof ConfigurableFileCollection) {
+            return item.from(extension[key])
+          } else if (item instanceof Collection) {
+            item.addAll(extension[key])
+            return item
+          }
+          return extension[key]
+        })
       }
-      classesDirs = { sourceSet.output.hasProperty('classesDirs') ? sourceSet.output.classesDirs : project.files(sourceSet.output.classesDir) }
-      classpath = { sourceSet.compileClasspath }
+      ConfigurableFileCollection templateClassesDirs = project.files();
+      classesDirs = { templateClassesDirs.from(sourceSet.output.hasProperty('classesDirs') ? sourceSet.output.classesDirs : sourceSet.output.classesDir) }
+      ConfigurableFileCollection templateClasspath = project.files();
+      classpath = { templateClasspath.from(sourceSet.compileClasspath) }
       targetCompatibility = targetCompatibilityGetter
     }
   }

src/test/gradle/build.gradle

@@ -38,6 +38,12 @@ sourceSets {
       srcDirs = [new File(forbiddenRootDir, 'src/main/java')]
     }
   }
+  main2 {
+    compileClasspath = files(forbiddenClasspath.tokenize(File.pathSeparator))
+    java {
+      srcDirs = [new File(forbiddenRootDir, 'src/main/java')]
+    }
+  }
   test {
     compileClasspath = files(forbiddenTestClasspath.tokenize(File.pathSeparator))
     java {
@@ -53,6 +59,10 @@ forbiddenApis {
 }
 
 forbiddenApisMain {
+  bundledSignatures.add('jdk-internal')
+}
+
+forbiddenApisMain2 {
   bundledSignatures += 'jdk-system-out'
 }