1 Reply Latest reply on Mar 22, 2012 7:52 AM by aclavaud

JBoss 7.1 + Hibernate 4.1.1 + Spring 3.1.1 + JPA + JTA : NPE when fetching a revision with a change on a @ManyToOne attribute

aclavaud Mar 20, 2012 10:17 AM

Dear,

This is my configuration (simplified) :

My Entities :

@MappedSuperclass

@Audited

public abstract class BaseObject {

public Boolean isActive;

}

@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)

@Audited

@TableGenerator(name = "AdUserKeyGen", table = "AD_SEQUENCE", pkColumnName = "COLUMN_NAME", pkColumnValue = "AD_USER_ID", valueColumnName = "SEQ_VAL", initialValue = 0, allocationSize = 1)

public final class AdUser extends BaseObject {

@Id

@GeneratedValue(strategy = GenerationType.TABLE, generator = "AdUserKeyGen")

@Column(name = "AD_User_ID", nullable = false, insertable = true, updatable = true, scale = 0)

private Long id;

private String initials;

@ManyToOne

@JoinColumn(name = "REF_OFFICE_ID")

private RefOffice refOffice;

}

@MappedSuperclass

@Audited

public abstract class DefaultObject extends BaseObject {

@Column(nullable = false, unique = true)

private String name;

}

@Cache(usage = CacheConcurrencyStrategy.TRANSACTIONAL)

@Entity

@Audited

@TableGenerator(name = "RefOfficeKeyGen", table = "AD_SEQUENCE", pkColumnName = "COLUMN_NAME", pkColumnValue = "REF_OFFICE_ID", valueColumnName = "SEQ_VAL", initialValue = 0, allocationSize = 1)

public final class RefOffice extends DefaultObject {

@Id

@GeneratedValue(strategy = GenerationType.TABLE, generator = "RefOfficeKeyGen")

@Column(name = "REF_OFFICE_ID", nullable = false, insertable = true, updatable = true, scale = 0)

private Long id;

@ManyToOne

@JoinColumn(name = "FLIGHTS_MANAGER")

private AdUser flightsManager;

}

My persistence.xml

<?xml version="1.0" encoding="UTF-8"?>

<persistence

version="2.0"

xmlns="http://java.sun.com/xml/ns/persistence"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/persistence

http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">

<persistence-unit name="XXXX">

<mapping-file>META-INF/orm.xml</mapping-file>

<class>ch.ilem.XXXX.base.model.AdUser</class>

<class>ch.ilem.XXXX.base.model.BaseObject</class>

<class>ch.ilem.XXXX.base.model.DefaultObject</class>

<class>ch.ilem.XXXX.base.model.RefOffice</class>

<jta-data-source>java:jboss/datasources/XXX</jta-data-source>

<shared-cache-mode>ENABLE_SELECTIVE</shared-cache-mode>

</properties>

</persistence-unit>

</persistence>

Revision access function :

@Service("changeLogService")

@Transactional(propagation = Propagation.REQUIRED, readOnly = true)

public final class ChangeLogServiceImpl implements IChangeLogService {

@Override

public BaseObject fetchRevision(final Class<? extends BaseObject> clazz, final Long id, final Integer revision) {

final AuditReader reader = AuditReaderFactory.get( entityManager );

final BaseObject result = reader.find( clazz, id, revision );

return result;

}

The problem.... :

If I create an AdUser instance, with refOffice = null and initials = 'Some value', I can save and retreive the revision using the fetchRevision function.
If I update the same instance, and change the initials attribute, I have no problem and can retreive the revision using the fetchRevision function.
If I update the instance and set the refOffice attribute, then, when fetching the revision, I have the following error :

14:06:13,382 ERROR [ch.ilem.XXXX.base.service.customDataSource.SmartGwtDataSource] (http-localhost-127.0.0.1-8443-4) execute() :: An unexpected error has occured : null: java.lang.NullPointerException

at org.hibernate.tuple.entity.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:755) [hibernate-core-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:4147) [hibernate-core-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.entities.mapper.relation.ToOneIdMapper.nullSafeMapToEntityFromMap(ToOneIdMapper.java:99) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.entities.mapper.relation.AbstractToOneMapper.mapToEntityFromMap(AbstractToOneMapper.java:38) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.entities.mapper.MultiPropertyMapper.mapToEntityFromMap(MultiPropertyMapper.java:137) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.entities.EntityInstantiator.createInstanceFromVersionsEntity(EntityInstantiator.java:99) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.entities.EntityInstantiator.addInstancesFromVersionsEntities(EntityInstantiator.java:112) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.query.impl.EntitiesAtRevisionQuery.list(EntitiesAtRevisionQuery.java:110) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.query.impl.AbstractAuditQuery.getSingleResult(AbstractAuditQuery.java:107) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.reader.AuditReaderImpl.find(AuditReaderImpl.java:121) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at org.hibernate.envers.reader.AuditReaderImpl.find(AuditReaderImpl.java:96) [hibernate-envers-4.1.1.Final.jar:4.1.1.Final]

at ch.ilem.XXXX.base.service.service.impl.AdChangeLogServiceImpl.fetchRevision(AdChangeLogServiceImpl.java:93) [XXXX-base-service-1.1.13-SNAPSHOT.jar:1.1.13-SNAPSHOT]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [classes.jar:1.6.0_29]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [classes.jar:1.6.0_29]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [classes.jar:1.6.0_29]

at java.lang.reflect.Method.invoke(Method.java:597) [classes.jar:1.6.0_29]

at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) [spring-tx-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at net.bull.javamelody.MonitoringSpringInterceptor.invoke(MonitoringSpringInterceptor.java:73) [javamelody-core-1.35.0.jar:1.35.0]

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) [spring-aop-3.1.1.RELEASE.jar:3.1.1.RELEASE]

at $Proxy200.fetchRevision(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [classes.jar:1.6.0_29]