NullPointerException Deploying App with One To Many Reltions
jcrume Feb 24, 2005 8:11 PMI am using JBoss 4.0.1 and EJB 3.0 preview 3.
I have developed a simple app that has a container managed one to many relationship. When I try to deploy it, I get a NullPointerException. Following are snippets from my two classes:
In Analyst:
<snipped code>
private Collection stocks;
<snipped code>
@OneToMany(mappedBy="analyst")
public Collection getStocks()
{
return stocks;
}
public void setStocks(Collection stocks)
{
this.stocks = stocks;
}
In Stock:
<snipped code>
private Analyst analyst;
<snipped code>
@ManyToOne(targetEntity="beans.Analyst")
public Analyst getAnalyst() {
return analyst;
}
public void setAnalyst(Analyst analyst) {
this.analyst = analyst;
}
Here is the stack trace:
19:42:01,209 ERROR [Ejb3Module] Starting failed jboss.j2ee:service=EJB3,module=S
tockListCmrApp.ejb3
java.lang.NullPointerException
at org.jboss.ejb3.entity.EntityToHibernateXml.mapManyToOne(EntityToHiber
nateXml.java:979)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleManyToOne(EntityToHi
bernateXml.java:956)
at org.jboss.ejb3.entity.EntityToHibernateXml.processProperty(EntityToHi
bernateXml.java:505)
at org.jboss.ejb3.entity.EntityToHibernateXml.iterateProperties(EntityTo
HibernateXml.java:251)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleBasicClass(EntityToH
ibernateXml.java:1846)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleClass(EntityToHibern
ateXml.java:1457)
at org.jboss.ejb3.entity.EntityToHibernateXml.convert(EntityToHibernateX
ml.java:161)
at org.jboss.ejb3.entity.HibernateSessionFactory.createSessionFactory(Hi
bernateSessionFactory.java:144)
at org.jboss.ejb3.Ejb3Module.createHibernateSessionFactory(Ejb3Module.ja
va:213)
at org.jboss.ejb3.Ejb3Module.startService(Ejb3Module.java:225)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanS
upport.java:272)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMB
eanSupport.java:222)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceControl
ler.java:891)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:416)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy16.start(Unknown Source)
at org.jboss.ejb3.EJB3Deployer.start(EJB3Deployer.java:166)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:964)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:775)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:738)
at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractIntercept
or.java:122)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelM
BeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy8.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymen
tScanner.java:305)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentS
canner.java:481)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
doScan(AbstractDeploymentScanner.java:204)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
loop(AbstractDeploymentScanner.java:215)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
run(AbstractDeploymentScanner.java:194)
19:42:01,219 WARN [ServiceController] Problem starting service jboss.j2ee:servi
ce=EJB3,module=StockListCmrApp.ejb3
java.lang.NullPointerException
at org.jboss.ejb3.entity.EntityToHibernateXml.mapManyToOne(EntityToHiber
nateXml.java:979)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleManyToOne(EntityToHi
bernateXml.java:956)
at org.jboss.ejb3.entity.EntityToHibernateXml.processProperty(EntityToHi
bernateXml.java:505)
at org.jboss.ejb3.entity.EntityToHibernateXml.iterateProperties(EntityTo
HibernateXml.java:251)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleBasicClass(EntityToH
ibernateXml.java:1846)
at org.jboss.ejb3.entity.EntityToHibernateXml.handleClass(EntityToHibern
ateXml.java:1457)
at org.jboss.ejb3.entity.EntityToHibernateXml.convert(EntityToHibernateX
ml.java:161)
at org.jboss.ejb3.entity.HibernateSessionFactory.createSessionFactory(Hi
bernateSessionFactory.java:144)
at org.jboss.ejb3.Ejb3Module.createHibernateSessionFactory(Ejb3Module.ja
va:213)
at org.jboss.ejb3.Ejb3Module.startService(Ejb3Module.java:225)
at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanS
upport.java:272)
at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMB
eanSupport.java:222)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceControl
ler.java:891)
at $Proxy0.start(Unknown Source)
at org.jboss.system.ServiceController.start(ServiceController.java:416)
at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy16.start(Unknown Source)
at org.jboss.ejb3.EJB3Deployer.start(EJB3Deployer.java:166)
at org.jboss.deployment.MainDeployer.start(MainDeployer.java:964)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:775)
at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:738)
at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatch
er.java:144)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractIntercept
or.java:122)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelM
BeanOperationInterceptor.java:131)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.
java:249)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:642)
at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:177)
at $Proxy8.deploy(Unknown Source)
at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymen
tScanner.java:305)
at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentS
canner.java:481)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
doScan(AbstractDeploymentScanner.java:204)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
loop(AbstractDeploymentScanner.java:215)
at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.
run(AbstractDeploymentScanner.java:194)