I try to migrate existing project from Hibernate 2.1.8 to 3.0.5 and I have one problem with subclassing. I beleive that is bug but if I am wrong please point me documentation.
I have parent abstract class
Code:
class abstract Parent{
abstract getField1();
abstract getField2();
}
and set of derived classes
Code:
class First extends Parent{
getField1() {return somevalue};
getField2() {return somevalue};
}
And corresponding mapping class
Code:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class table="XXX" name="com.Parent">
<id unsaved-value="null" name="id">
<generator class="native"/>
</id>
<discriminator column="type"/>
<subclass name="com.First"/>
<subclass name="com.Second"/>
</class>
</hibernate-mapping>
I am not using Field1 and Field2 for mapping. It is just methods that I want to override in derived classes. But on start of application I got AbstractMethodException. See stack trace below. After some researching I found solution: add to class tag
lazy="false" attribute.
Does it right solution??
Exception:
Code:
3516 [http-8080-Processor25] ERROR org.hibernate.proxy.BasicLazyInitializer - CGLIB Enhancement failed: de.kesselweb.mydiablo.data.beans.Character
net.sf.cglib.core.CodeGenerationException: java.lang.AbstractMethodError-->de.kesselweb.mydiablo.data.beans.Character.getInitialStrength()I
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:235)
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:220)
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:216)
at net.sf.cglib.proxy.Enhancer.createUsingReflection(Enhancer.java:606)
at net.sf.cglib.proxy.Enhancer.firstInstance(Enhancer.java:532)
at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:220)
at net.sf.cglib.proxy.Enhancer.createHelper(Enhancer.java:373)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:281)
at net.sf.cglib.proxy.Enhancer.create(Enhancer.java:640)
at org.hibernate.proxy.CGLIBLazyInitializer.getProxyFactory(CGLIBLazyInitializer.java:94)
at org.hibernate.proxy.CGLIBProxyFactory.postInstantiate(CGLIBProxyFactory.java:42)
at org.hibernate.tuple.PojoTuplizer.buildProxyFactory(PojoTuplizer.java:144)
at org.hibernate.tuple.AbstractTuplizer.<init>(AbstractTuplizer.java:83)
at org.hibernate.tuple.PojoTuplizer.<init>(PojoTuplizer.java:54)
at org.hibernate.tuple.TuplizerLookup.create(TuplizerLookup.java:47)
at org.hibernate.tuple.EntityMetamodel.<init>(EntityMetamodel.java:218)
at org.hibernate.persister.entity.BasicEntityPersister.<init>(BasicEntityPersister.java:400)
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:104)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:55)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:211)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1005)
at org.nanocontainer.persistence.hibernate.SessionFactoryDelegator.<init>(SessionFactoryDelegator.java:42)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at org.picocontainer.defaults.InstantiatingComponentAdapter.newInstance(InstantiatingComponentAdapter.java:128)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:154)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:56)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:182)
at org.picocontainer.defaults.DecoratingComponentAdapter.getComponentInstance(DecoratingComponentAdapter.java:43)
at org.picocontainer.defaults.CachingComponentAdapter.getComponentInstance(CachingComponentAdapter.java:38)
at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:341)
at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:324)
at org.picocontainer.alternatives.ImmutablePicoContainer.getComponentInstance(ImmutablePicoContainer.java:40)
at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:347)
at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:324)
at org.picocontainer.alternatives.ImmutablePicoContainer.getComponentInstance(ImmutablePicoContainer.java:40)
at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:347)
at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:324)
at org.picocontainer.defaults.BasicComponentParameter.resolveInstance(BasicComponentParameter.java:80)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:117)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:191)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:151)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:56)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:182)
at org.picocontainer.defaults.DecoratingComponentAdapter.getComponentInstance(DecoratingComponentAdapter.java:43)
at org.picocontainer.defaults.CachingComponentAdapter.getComponentInstance(CachingComponentAdapter.java:38)
at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:341)
at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstance(DefaultPicoContainer.java:324)
at org.picocontainer.defaults.BasicComponentParameter.resolveInstance(BasicComponentParameter.java:80)
at org.picocontainer.defaults.ComponentParameter.resolveInstance(ComponentParameter.java:117)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getConstructorArguments(ConstructorInjectionComponentAdapter.java:191)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter$1.run(ConstructorInjectionComponentAdapter.java:151)
at org.picocontainer.defaults.ThreadLocalCyclicDependencyGuard.observe(ThreadLocalCyclicDependencyGuard.java:56)
at org.picocontainer.defaults.ConstructorInjectionComponentAdapter.getComponentInstance(ConstructorInjectionComponentAdapter.java:182)
at org.picocontainer.defaults.DecoratingComponentAdapter.getComponentInstance(DecoratingComponentAdapter.java:43)
at org.picocontainer.defaults.CachingComponentAdapter.getComponentInstance(CachingComponentAdapter.java:38)
at org.picocontainer.defaults.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:341)
at org.picocontainer.defaults.DefaultPicoContainer.getComponentInstancesOfType(DefaultPicoContainer.java:300)
at org.picocontainer.defaults.DefaultLifecycleManager.start(DefaultLifecycleManager.java:65)
at org.picocontainer.defaults.DefaultPicoContainer.start(DefaultPicoContainer.java:389)
at org.nanocontainer.integrationkit.LifecycleContainerBuilder.autoStart(LifecycleContainerBuilder.java:52)
at org.nanocontainer.integrationkit.LifecycleContainerBuilder.buildContainer(LifecycleContainerBuilder.java:45)
at org.nanocontainer.nanowar.ServletRequestContainerLauncher.startContainer(ServletRequestContainerLauncher.java:41)
at org.nanocontainer.nanowar.ServletRequestContainerFilter.doFilter(ServletRequestContainerFilter.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.AbstractMethodError: de.kesselweb.mydiablo.data.beans.Character.getInitialStrength()I
at de.kesselweb.mydiablo.data.beans.Character$$EnhancerByCGLIB$$cbf7b529.CGLIB$getInitialStrength$22(<generated>)
at de.kesselweb.mydiablo.data.beans.Character$$EnhancerByCGLIB$$cbf7b529$$FastClassByCGLIB$$eff3cee5.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:167)
at org.hibernate.proxy.CGLIBLazyInitializer$1.intercept(CGLIBLazyInitializer.java:174)
at de.kesselweb.mydiablo.data.beans.Character$$EnhancerByCGLIB$$cbf7b529.getInitialStrength(<generated>)
at de.kesselweb.mydiablo.data.beans.Character.<init>(Character.java:57)
at de.kesselweb.mydiablo.data.beans.Character$$EnhancerByCGLIB$$cbf7b529.<init>(<generated>)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
at net.sf.cglib.core.ReflectUtils.newInstance(ReflectUtils.java:228)
... 80 more
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