Hi all,
Does anyone know if it's possible to persist generic classes (with JDO, for
example)? I have a class like this:
@PersistenceCapable(identityType = IdentityType.APPLICATION, detachable =
"true")
public class MyClass<T extends IsSerializable> implements IsSerializable {
...
}
but the JDO compiler is having a problem with recognizing "T" (see
transcript below).
Has anyone persisted generic classes with JDO and GAE?
Thanks,
~Owen
LOG:
30-ene-2011 12:33:07 org.datanucleus.enhancer.asm.ASMClassEnhancer enhance
GRAVE: Error thrown enhancing with ASMClassEnhancer
java.lang.IllegalStateException: Unknown type: T
at
org.datanucleus.jdo.metadata.JDOAnnotationReader.processMemberAnnotations(JDOAnnotationReader.java:1659)
at
org.datanucleus.metadata.annotations.AbstractAnnotationReader.getMetaDataForClass(AbstractAnnotationReader.java:169)
at
org.datanucleus.metadata.annotations.AnnotationManagerImpl.getMetaDataForClass(AnnotationManagerImpl.java:136)
at
org.datanucleus.metadata.MetaDataManager.loadAnnotationsForClass(MetaDataManager.java:2278)
at
org.datanucleus.jdo.metadata.JDOMetaDataManager.getMetaDataForClassInternal(JDOMetaDataManager.java:369)
at
org.datanucleus.metadata.MetaDataManager.getMetaDataForClass(MetaDataManager.java:1125)
at
org.datanucleus.enhancer.AbstractClassEnhancer.isPersistenceCapable(AbstractClassEnhancer.java:183)
at
org.datanucleus.enhancer.asm.JdoMethodAdapter.visitFieldInsn(JdoMethodAdapter.java:81)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at org.objectweb.asm.ClassReader.accept(Unknown Source)
at
org.datanucleus.enhancer.asm.ASMClassEnhancer.enhance(ASMClassEnhancer.java:355)
at
org.datanucleus.enhancer.DataNucleusEnhancer.enhanceClass(DataNucleusEnhancer.java:974)
at
org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:570)
at
org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
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 com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:57)
at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:60)
at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:41)
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