}

    private boolean isJreContainer(ClasspathEntry entry) {
        return entry instanceof Container && ((Container) entry).getPath().startsWith("org.eclipse.jdt.launching.JRE_CONTAINER");
    }

    private boolean isOutputLocation(ClasspathEntry entry) {
        return entry instanceof Output;
    }

    /**
     * Creates a new {@link FileReference} instance.

                    this.ecjClasspath = ecjClasspath
                }

                @Override
                List<String> asArguments() {
                    return ["-cp", ecjClasspath.asPath, "org.eclipse.jdt.internal.compiler.batch.Main"]
                 }
            }

            compileJava {
                def customJavaLauncher = javaToolchains.launcherFor {

==== Changed classpath filtering for Eclipse

Gradle 5.6 no longer supplies custom classpath attributes in the Eclipse model.
Instead, it provides the attributes for link:https://www.eclipse.org/eclipse/news/4.8/jdt.php#jdt-test-sources[Eclipse test sources].
This change requires Buildship version 3.1.1 or later.

==== Embedded Kotlin upgraded to 1.3.41

         <artifact name="ec4j-core-0.3.0.jar">
            <pgp value="2E92113263FC31C74CCBAAB20E91C2DE43B72BB1"/>
         </artifact>
      </component>
      <component group="org.eclipse.jdt.core.compiler" name="ecj" version="4.6.1">
         <artifact name="ecj-4.6.1.jar">
            <pgp value="45DAD8AED069092BC7BE9843ECA081A9790D4FC4"/>
         </artifact>
      </component>

Method <org.gradle.plugins.ide.eclipse.model.EclipseModel.jdt(groovy.lang.Closure)> has arguments/return type groovy.lang.Closure that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (EclipseModel.java:0)