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POCan an @Embeddable class be private?
 

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  1. POCan an @Embeddable class be private?
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    <p>Is there is anything in the JPA specification that describes what a valid @Embeddable class can be? I have looked but cannot find anything.</p> <p>I am using EclipseLink (2.3.0-M7 - full build string 2.3.0.v20110429-r9282) with Hibernate (3.6.4.Final) and Spring (3.0.5) and have set up my application as documented at <a href="http://wiki.eclipse.org/EclipseLink/Examples/MOXy/Spring/JAXBAnnotations" rel="nofollow">EclipseLink/Examples/MOXy/Spring/JAXBAnnotations</a>. Everything else currently works and has been for months. I was adding an @Embeddable class and started getting a NPE.</p> <p>Here is some example code that I hope someone can use to reproduce this if it is a bug with EclipseLink because I remove EclipseLink library and configuration (and revert to Hibernate's implementation) then I no longer get the NPE.</p> <p>Test class <em>Broken.java</em></p> <pre><code>package x.y.z.model; import javax.persistence.*; import javax.xml.bind.annotation.*; import java.io.Serializable; @Entity public class Broken { @EmbeddedId private Pk pk = new Pk(); @Embeddable private static class Pk implements Serializable { @ManyToOne private String foo; public String getFoo() { return this.foo; } public void setFoo(String foo) { this.foo = foo; } } } </code></pre> <p>The Spring bean configuration I have is:</p> <pre><code>&lt;bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"&gt; &lt;property name="contextPath" value="x.y.z.model"/&gt; &lt;/bean&gt; &lt;bean id="xmlHelper" class="x.y.xml.XMLHelper"&gt; &lt;property name="marshaller" ref="jaxbMarshaller"/&gt; &lt;/bean&gt; </code></pre> <p>(see above link for <code>XMLHelper</code> class)</p> <p>Finally I add the following to <em>jaxb.index</em>:</p> <pre><code>Broken </code></pre> <p>When starting the Spring application, I get the following exception:</p> <pre><code>ERROR org.springframework.test.context.TestContextManager 324 - Caught exception while allowing TestExecutionListener [org.springframework.test.context.support.DependencyInjectionTestExecutionListener@9b601d] to prepare test instance [x.y.z.service.AnyTest@198dc19] java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:308) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:321) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:220) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:301) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:303) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180) at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:35) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:115) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:97) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103) at $Proxy0.invoke(Unknown Source) at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150) at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jaxbMarshaller' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.springframework.oxm.UncategorizedMappingException: Unknown JAXB exception; nested exception is javax.xml.bind.JAXBException - with linked exception: [java.lang.NullPointerException] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1420) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:580) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:84) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:1) at org.springframework.test.context.TestContext.loadApplicationContext(TestContext.java:280) at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:304) ... 31 more Caused by: org.springframework.oxm.UncategorizedMappingException: Unknown JAXB exception; nested exception is javax.xml.bind.JAXBException - with linked exception: [java.lang.NullPointerException] at org.springframework.oxm.jaxb.Jaxb2Marshaller.convertJaxbException(Jaxb2Marshaller.java:668) at org.springframework.oxm.jaxb.Jaxb2Marshaller.getJaxbContext(Jaxb2Marshaller.java:335) at org.springframework.oxm.jaxb.Jaxb2Marshaller.afterPropertiesSet(Jaxb2Marshaller.java:317) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417) ... 44 more Caused by: javax.xml.bind.JAXBException - with linked exception: [java.lang.NullPointerException] at org.eclipse.persistence.jaxb.JAXBContext$ContextPathInput.createContextState(JAXBContext.java:661) at org.eclipse.persistence.jaxb.JAXBContext$ContextPathInput.createContextState(JAXBContext.java:621) at org.eclipse.persistence.jaxb.JAXBContext.&lt;init&gt;(JAXBContext.java:134) at org.eclipse.persistence.jaxb.JAXBContextFactory.createContext(JAXBContextFactory.java:108) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:128) at javax.xml.bind.ContextFinder.find(ContextFinder.java:249) at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:372) at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:337) at org.springframework.oxm.jaxb.Jaxb2Marshaller.createJaxbContextFromContextPath(Jaxb2Marshaller.java:355) at org.springframework.oxm.jaxb.Jaxb2Marshaller.getJaxbContext(Jaxb2Marshaller.java:328) ... 47 more Caused by: java.lang.NullPointerException at org.eclipse.persistence.jaxb.javamodel.Helper.isBuiltInJavaType(Helper.java:261) at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.shouldGenerateTypeInfo(AnnotationsProcessor.java:1526) at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processClass(AnnotationsProcessor.java:1029) at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processAdditionalClasses(AnnotationsProcessor.java:994) at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.postBuildTypeInfo(AnnotationsProcessor.java:576) at org.eclipse.persistence.jaxb.compiler.AnnotationsProcessor.processClassesAndProperties(AnnotationsProcessor.java:230) at org.eclipse.persistence.jaxb.compiler.Generator.&lt;init&gt;(Generator.java:104) at org.eclipse.persistence.jaxb.JAXBContext$ContextPathInput.createContextState(JAXBContext.java:658) ... 60 more </code></pre> <p>If I change the @Embeddable class from <em>private</em> to <em>public</em> (and use EclipseLink), the NPE no longer occurs. So I have a solution that works but want to understand why.</p>
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    1. COA nice finding indeed. +1
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      1. USAdeel Ansari
 

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