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How does JUnit find the eclipse plug-in being tested? [message #606377] Thu, 29 July 2010 19:14
kcassell2001 is currently offline kcassell2001
Messages: 18
Registered: May 2010
Junior Member
I am writing a plug-in (ClassRefactoringPlugin) that examines source code in Eclipse 3.6.1. The plug-in contains a CallData class that examines a Java source file and figures out which Java elements are called from a method using JDT operations. I wrote a JUnit 4 test for this class that also resides in the ClassRefactoringPlugin project. When I ran it as a JUnit plug-in test, I got:

Java Model Exception: Java Model Status [ClassRefactoringPlugin does not exist]

What have I done wrong? The configuration specifies to launch with all workspace and enabled target plug-ins, and ClassRefactoringPlugin is in my dropins directory. (Although shouldn't the project's version of the plug-in be recognized by the spawned workspace?)

Here's the stack trace:

!MESSAGE CallData.calculateCalledMethods: Java Model Exception: Java Model Status [ClassRefactoringPlugin does not exist]
Java Model Exception: Java Model Status [ClassRefactoringPlugin does not exist]
        at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:502)
        at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:246)
        at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
        at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
        at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
        at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
        at org.eclipse.jdt.internal.core.Openable.openAncestors(Openable.java:504)
        at org.eclipse.jdt.internal.core.CompilationUnit.openAncestors(CompilationUnit.java:1170)
        at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:240)
        at org.eclipse.jdt.internal.core.SourceRefElement.generateInfos(SourceRefElement.java:107)
        at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515)
        at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:252)
        at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238)
        at org.eclipse.jdt.internal.core.JavaElement.getChildren(JavaElement.java:193)
        at org.eclipse.jdt.internal.core.JavaElement.getChildrenOfType(JavaElement.java:207)
        at org.eclipse.jdt.internal.core.SourceType.getMethods(SourceType.java:403)
        at nz.ac.vuw.ecs.kcassell.utils.EclipseSearchUtils.addDesiredMethods(EclipseSearchUtils.java:333)
        at nz.ac.vuw.ecs.kcassell.utils.EclipseSearchUtils.getMethods(EclipseSearchUtils.java:210)
        at nz.ac.vuw.ecs.kcassell.callgraph.CallData.collectMethodCallData(CallData.java:203)
        at nz.ac.vuw.ecs.kcassell.callgraph.CallData.calculateCalledMethods(CallData.java:176)
        at nz.ac.vuw.ecs.kcassell.callgraph.CallData.collectCallData(CallData.java:151)
        at nz.ac.vuw.ecs.kcassell.callgraph.CallDataTest.testCollectCallData(CallDataTest.java:67)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at junit.framework.TestCase.runTest(TestCase.java:168)
        at junit.framework.TestCase.runBare(TestCase.java:134)
        at junit.framework.TestResult$1.protect(TestResult.java:110)
        at junit.framework.TestResult.runProtected(TestResult.java:128)
        at junit.framework.TestResult.run(TestResult.java:113)
        at junit.framework.TestCase.run(TestCase.java:124)
        at junit.framework.TestSuite.runTest(TestSuite.java:232)
        at junit.framework.TestSuite.run(TestSuite.java:227)
        at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
        at org.eclipse.pde.internal.junit.runtime.RemotePluginTestRunner.main(RemotePluginTestRunner.java:62)
        at org.eclipse.pde.internal.junit.runtime.UITestApplication$1.run(UITestApplication.java:116)
        at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
        at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)
        at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3515)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3164)
        at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2640)
        at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
        at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2438)
        at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:671)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:664)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
        at org.eclipse.pde.internal.junit.runtime.UITestApplication.start(UITestApplication.java:47)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1383)


I am wondering if the error message might be a red herring. The error occurs when making a call to

IMethod[] methods = type.getMethods();


If I set a breakpoint there and look at type in the Variables view of the debugger, I see:

CallDataTest (not open) [in CallDataTest.java [in nz.ac.vuw.ecs.kcassell.callgraph [in test [in ClassRefactoringPlugin]]]]


I wonder if I am omitting some important preliminary step to make the project available for examination. First, I attempt to activate the workbench, like so:

public static void activateWorkbench() {
    // possible for PlatformUI.getWorkbench to throw an IllegalStateException
    // if the workbench is not yet started e.g createAndRunWorkbench() has not yet been called
    IWorkbench workbench = PlatformUI.getWorkbench();
    IWorkbenchWindow workbenchWindow =
        workbench.getActiveWorkbenchWindow();
    workbenchWindow.getActivePage();
}


Then I try to get type using its handle:

protected IType iType = EclipseUtils.getTypeFromHandle(
        "=ClassRefactoringPlugin/test<nz.ac.vuw.ecs.kcassell.callgraph{CallDataTest.java[CallDataTest");

public static IType getTypeFromHandle(String handle) {
IType type = null;
IJavaElement element = JavaCore.create(handle);
if (element == null) {
    System.err.println("  No element created from " + handle);
} else if (element instanceof IType) {
    type = (IType) element;
}
    return type;
}


I am new to plug-in development, so any help would be much appreciated.

Cheers, Keith

[Updated on: Wed, 13 April 2011 22:29]

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