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| Re: EMF, Java 8 and sun.misc.Unsafe.ensureClassInitialized( [message #1494174 is a reply to message #1492134] |
Mon, 01 December 2014 08:38   |
 Ed Merks
Messages: 30372
Registered: July 2009 |
Senior Member |
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Andreas,
Comments below.
On 29/11/2014 4:25 PM, Andreas Graf wrote:
> Dear all,
>
> we have a EMF project that builds fine with JDK 1.7 and Tycho (test
> cases in surefire) when mvn/Tycho runs with a Java 1.7.
The stack you show below looks like a workspace job. Is this really
running as an Eclipse application or some for of stand-alone where
Surefire sets the classpath? Certainly it looks like a registry
reader is involved so it looks like a real Eclipse application running,
but in that case, how is Surefire needed?
Also note that the exception might look like the class can't be found,
but it could instead be a case that there is an exception initializing
the package class instance and you don't see the stack trace for that.
That could be an issue of threading. E.g., several threads trying to
load the same class at the same time. The behavior of the class loader
is a bit funky is such cases where it might return null for static final
constants you'd never expect could ever be null.
>
> However, running Tycho with a JDK 1.8 used to work, and now it breaks
>
> mavenrc:
> export JAVA_HOME="C:\\Program Files\\Java\\jdk1.8.0_25"
>
> Now the test cases fail because we see:
>
>
> ava.lang.NoClassDefFoundError: Could not initialize class
> com.x.x.x.XPackage
> at sun.misc.Unsafe.ensureClassInitialized(Native Method)
> at
> sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
> at
> sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:142)
> at java.lang.reflect.Field.acquireFieldAccessor(Field.java:1082)
> at java.lang.reflect.Field.getFieldAccessor(Field.java:1063)
> at java.lang.reflect.Field.get(Field.java:387)
> at
> org.eclipse.emf.ecore.plugin.RegistryReader$EPackageDescriptor.getEPackage(RegistryReader.java:273)
> at
> org.eclipse.emf.ecore.impl.EPackageImpl$1.getEPackage(EPackageImpl.java:163)
> at
> org.eclipse.emf.ecore.impl.EPackageRegistryImpl.getEPackage(EPackageRegistryImpl.java:127)
> at
> org.eclipse.emf.ecore.impl.EPackageRegistryImpl.delegatedGetEPackage(EPackageRegistryImpl.java:190)
> at
> org.eclipse.emf.ecore.impl.EPackageRegistryImpl.getEPackage(EPackageRegistryImpl.java:143)
> at
> org.eclipse.emf.ecore.util.BasicExtendedMetaData.getPackage(BasicExtendedMetaData.java:113)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.getPackageForURI(XMLHandler.java:2494)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.getFactoryForPrefix(XMLHandler.java:2458)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.createObjectByType(XMLHandler.java:1335)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.createTopObject(XMLHandler.java:1504)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:1026)
> at
> org.eclipse.emf.ecore.xmi.impl.XMIHandler.processElement(XMIHandler.java:77)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:1008)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:719)
> at
> org.eclipse.emf.ecore.xmi.impl.XMIHandler.startElement(XMIHandler.java:163)
> at
> org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
> at
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(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
> org.eclipse.sphinx.emf.resource.ExtendedXMLLoadImpl.load(ExtendedXMLLoadImpl.java:194)
> at
> org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:253)
> at
> org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1518)
> at
> org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1297)
> at
> org.eclipse.sphinx.emf.util.EcoreResourceUtil.loadResource(EcoreResourceUtil.java:1152)
> at
> org.eclipse.sphinx.emf.util.EcoreResourceUtil.loadResource(EcoreResourceUtil.java:788)
> at
> org.eclipse.sphinx.emf.util.EcorePlatformUtil$7.run(EcorePlatformUtil.java:690)
> at
> org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328)
> at
> org.eclipse.emf.transaction.util.TransactionUtil.runExclusive(TransactionUtil.java:328)
> at
> org.eclipse.sphinx.emf.util.EcorePlatformUtil.loadResource(EcorePlatformUtil.java:686)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager$4.run(ModelLoadManager.java:774)
> at
> org.eclipse.emf.transaction.impl.TransactionalEditingDomainImpl.runExclusive(TransactionalEditingDomainImpl.java:328)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager.loadModelFilesInEditingDomain(ModelLoadManager.java:749)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager.runLoadModelFiles(ModelLoadManager.java:731)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager.runDetectAndLoadModelFiles(ModelLoadManager.java:712)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager.runLoadProjects(ModelLoadManager.java:591)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager.access$0(ModelLoadManager.java:568)
> at
> org.eclipse.sphinx.emf.workspace.loading.ModelLoadManager$2.run(ModelLoadManager.java:541)
> at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
>
>
> Any ideas what the reason could be?
>
> Thanks in advance,
>
> Andreas
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