[hibernate-issues] [Hibernate-JIRA] Created: (HHH-7101) NPE when trying to create EntityManagerFactory

[Michael Nascimento Santos (JIRA)]

NPE when trying to create EntityManagerFactory
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                 Key: HHH-7101
                 URL: https://hibernate.onjira.com/browse/HHH-7101
             Project: Hibernate ORM
          Issue Type: Bug
          Components: core
    Affects Versions: 4.1.0
         Environment: hibernate-jpa-2.0-api:1.0.1-Final; hibernate-core:4.1.0.Final; hibernate-entitymanager:4.1.0.Final
            Reporter: Michael Nascimento Santos
         Attachments: npe4cacheable.zip

A NPE is thrown for a simple pure JPA entity annotated with @Cacheable as follows:

@Entity
@Cacheable
public class SampleEntity {
   @Id
   @GeneratedValue(strategy=GenerationType.AUTO)
   private Long id;
}

When Persistence.createEntityManagerFactory(String) is called and such entity is part of the persistence unit, this produces:

java.lang.reflect.InvocationTargetException
	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.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:297)
	at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NullPointerException
	at org.hibernate.annotations.CacheConcurrencyStrategy.fromAccessType(CacheConcurrencyStrategy.java:52)
	at org.hibernate.cfg.AnnotationBinder.determineCacheConcurrencyStrategy(AnnotationBinder.java:1044)
	at org.hibernate.cfg.AnnotationBinder.buildCacheMock(AnnotationBinder.java:1011)
	at org.hibernate.cfg.AnnotationBinder.determineCacheSettings(AnnotationBinder.java:968)
	at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:577)
	at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3431)
	at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3385)
	at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1337)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1727)
	at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:88)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889)
	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
	at org.hibernate.test.npe4cacheable.SampleEntity.main(SampleEntity.java:18)
	... 6 more

Hibernate should either choose some sensible default strategy or produce a clear message indicating the need to set one manually.

Attached is a Maven-powered sample with Derby that can be executed with exec:java .

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