Headless exception in test show an unwanted link to graphic elements

[fdagnat]

When executing tests Task :openflexo-diagram:diagram-ta:test, we get headless exceptions :

org.openflexo.technologyadapter.diagram.fml.TestFMLDiagramPrettyPrint1 > loadInitialVersion FAILED
    java.lang.ExceptionInInitializerError at TestFMLDiagramPrettyPrint1.java:112
        Caused by: java.awt.HeadlessException at TestFMLDiagramPrettyPrint1.java:112

org.openflexo.technologyadapter.diagram.fml.TestFMLDiagramPrettyPrint3 > loadInitialVersion FAILED
    java.lang.ExceptionInInitializerError at TestFMLDiagramPrettyPrint3.java:118
        Caused by: java.awt.HeadlessException at TestFMLDiagramPrettyPrint3.java:118

org.openflexo.technologyadapter.diagram.fml.TestFMLDiagramPrettyPrint2 > initServiceManager FAILED
    java.lang.ExceptionInInitializerError at TestFMLDiagramPrettyPrint2.java:133
        Caused by: java.awt.HeadlessException at TestFMLDiagramPrettyPrint2.java:133

For example, the stack trace of test org.openflexo.technologyadapter.diagram.fml > TestFMLDiagramPrettyPrint1 is :

java.lang.ExceptionInInitializerError
	at org.openflexo.diana.DianaModelFactoryImpl.makeMouseDragControlAction(DianaModelFactoryImpl.java:356)
	at org.openflexo.diana.DianaModelFactoryImpl.makeMouseDragControl(DianaModelFactoryImpl.java:330)
	at org.openflexo.diana.DianaModelFactory.makeMouseDragControl(DianaModelFactory.java:1316)
	at org.openflexo.diana.DianaModelFactory.applyBasicControls(DianaModelFactory.java:338)
	at org.openflexo.diana.DianaModelFactory.objectHasBeenCreated(DianaModelFactory.java:212)
	at org.openflexo.pamela.factory.PamelaModelFactory$PAMELAProxyFactory.newInstance(PamelaModelFactory.java:267)
	at org.openflexo.pamela.factory.PamelaModelFactory._newInstance(PamelaModelFactory.java:346)
	at org.openflexo.pamela.xml.XMLSaxDeserializer.buildObjectFromAttributes(XMLSaxDeserializer.java:374)
	at org.openflexo.pamela.xml.XMLSaxDeserializer.startElement(XMLSaxDeserializer.java:233)
	at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
	at javax.xml.parsers.SAXParser.parse(SAXParser.java:195)
	at org.openflexo.pamela.xml.XMLSaxDeserializer.deserializeDocument(XMLSaxDeserializer.java:142)
	at org.openflexo.pamela.factory.PamelaModelFactory.deserialize(PamelaModelFactory.java:826)
	at org.openflexo.pamela.factory.PamelaModelFactory.deserialize(PamelaModelFactory.java:821)
	at org.openflexo.foundation.resource.PamelaXMLSerializableResourceImpl.performLoad(PamelaXMLSerializableResourceImpl.java:81)
	at org.openflexo.foundation.resource.PamelaResourceImpl.loadResourceData(PamelaResourceImpl.java:188)
	at org.openflexo.foundation.resource.PamelaResourceWithPotentialCrossReferencesImpl.performLoadResourceData(PamelaResourceWithPotentialCrossReferencesImpl.java:166)
	at org.openflexo.foundation.resource.FlexoResourceImpl.getResourceData(FlexoResourceImpl.java:173)
	at org.openflexo.foundation.fml.VirtualModelLibrary.getVirtualModel(VirtualModelLibrary.java:133)
	at org.openflexo.foundation.fml.VirtualModelLibrary.getVirtualModel(VirtualModelLibrary.java:112)
	at org.openflexo.technologyadapter.diagram.fml.TestFMLDiagramPrettyPrint1.loadInitialVersion(TestFMLDiagramPrettyPrint1.java:112)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
	at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
	at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
Caused by: java.awt.HeadlessException
	at sun.awt.HeadlessToolkit.createCustomCursor(HeadlessToolkit.java:251)
	at org.openflexo.diana.control.actions.MoveAction.<clinit>(MoveAction.java:74)
	... 75 more