[GROOVY-8434] ClassCastException: Class cannot be cast to type-of-with's-delegate

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 2.4.12
• Component/s: Compiler
• Environment: Windows 10, Gradle 4.2.1
• Assignee: Unassigned
• Reporter: Robert Papp
• Created: 08/Jan/18 01:16
• Updated: 17/Jan/19 12:52
• Resolved: 17/Jan/19 12:52

Description

I'm sorry for the hard repro, but I couldn't figure it out with a smaller one.
1. https://github.com/TWiStErRob/net.twisterrob.gradle.quality/tree/groovy-cast-bug
2. gradlew test (if you're lucky it runs and fails, otherwise don't fret there's an other way)

Test fails:

Caused by: java.lang.ClassCastException: java.lang.Class cannot be cast to org.gradle.api.reporting.ConfigurableReport
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig$_setupReports_closure2$_closure3.doCall(CheckStyleTask.groovy:95)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig$_setupReports_closure2$_closure3.call(CheckStyleTask.groovy)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig$_setupReports_closure2.doCall(CheckStyleTask.groovy:94)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig$_setupReports_closure2.call(CheckStyleTask.groovy)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig.setupReports(CheckStyleTask.groovy:91)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig.execute(CheckStyleTask.groovy:42)
	at net.twisterrob.gradle.checkstyle.CheckStyleTask$TaskConfig.execute(CheckStyleTask.groovy)
	at org.gradle.api.internal.tasks.DefaultTaskContainer.create(DefaultTaskContainer.java:148)

Now, that's obviously not my error, because 1) it worked in the previous commit (when the class wasn't an inner class) and 2) I'm using ast(groovy.transform.CompileStatic) to build.

Another way: gradlew groovyCompile, and then observe the build directory:

static def setupReports(CheckStyleTask task) {
	task.reports.with {
		def reportsDir = task.project.extensions.findByType(ReportingExtension).baseDir
		xml.with {
			enabled = true
			setDestination(new File(reportsDir, 'checkstyle.xml'))

compiles to

public Object doCall(Object it) {
                            boolean var2 = true;
                            ((ConfigurableReport)CheckStyleTask.class).setEnabled(var2);
                            Object var10001 = null;
                            ((ConfigurableReport)((_closure4)this).getDelegate()).setDestination(new File((File)ScriptBytecodeAdapter.castToType(this.reportsDir.get(), File.class), "checkstyle.html"));
                            Object var10000 = null;

Note: the first cast is wrong, the second one is using getDelegate properly.

Issue Links

• duplicates: GROOVY-8873 Fails at runtime with @CompileStatic and two nested with