NPE beim Persistieren einer Entität

Raphalon · 19. Jan 2013

Beim Persistieren eines neues Customer wird eine NPE geworfen und ich finde den Grund nicht. Warum wird hier toString aufgerufen? Wenn ich im Customer das "getId()" aus der toString()-Methode nehme, dann geht es. Aber das kann nicht die Ursache des Problems sein.

Java:

java.lang.NullPointerException
	at de.org.grp.domain.Customer.getId(Customer.java:35)
	at de.org.grp.domain.Customer.toString(Customer.java:60)
	at java.text.MessageFormat.subformat(MessageFormat.java:1246)
	at java.text.MessageFormat.format(MessageFormat.java:836)
	at java.text.Format.format(Format.java:140)
	at java.text.MessageFormat.format(MessageFormat.java:812)
	at org.eclipse.persistence.internal.localization.EclipseLinkLocalization.buildMessage(EclipseLinkLocalization.java:77)
	at org.eclipse.persistence.internal.localization.TraceLocalization.buildMessage(TraceLocalization.java:30)
	at org.eclipse.persistence.logging.AbstractSessionLog.formatMessage(AbstractSessionLog.java:852)
	at org.eclipse.persistence.logging.JavaLog.internalLog(JavaLog.java:275)
	at org.eclipse.persistence.logging.JavaLog.log(JavaLog.java:261)
	at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:3100)
	at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4218)
	at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4190)
	at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4166)
	at org.eclipse.persistence.internal.sessions.AbstractSession.log(AbstractSession.java:4088)
	at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.logDebugMessage(UnitOfWorkImpl.java:5527)
	at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNotRegisteredNewObjectForPersist(UnitOfWorkImpl.java:4220)
	at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.registerNotRegisteredNewObjectForPersist(RepeatableWriteUnitOfWork.java:513)
	at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:4176)
	at org.eclipse.persistence.internal.jpa.EntityManagerImpl.persist(EntityManagerImpl.java:440)
	at com.sun.enterprise.container.common.impl.EntityManagerWrapper.persist(EntityManagerWrapper.java:269)
	at de.org.grp.sl.CustomerService.createCustomer(CustomerService.java:29)
	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.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)
	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)
	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5388)
	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
	at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:42)
	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 com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)
	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)
	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)
	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 com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:861)
	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:800)
	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:370)
	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5360)
	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5348)
	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)
	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:89)
	at $Proxy252.createCustomer(Unknown Source)
	at de.org.grp.sl.__EJB31_Generated__CustomerService__Intf____Bean__.createCustomer(Unknown Source)
	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.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:267)
	at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:52)
	at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:137)
	at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:263)
	at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:110)
	at org.jboss.weld.bean.proxy.EnterpriseTargetBeanInstance.invoke(EnterpriseTargetBeanInstance.java:56)
	at org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:105)
	at de.org.grp.sl.CustomerService$Proxy$_$$_Weld$Proxy$.createCustomer(CustomerService$Proxy$_$$_Weld$Proxy$.java)
	at de.org.grp.back.Initializer.executeCustomerActivities(Initializer.java:43)
	at de.org.grp.back.Initializer$Proxy$_$$_WeldClientProxy.executeCustomerActivities(Initializer$Proxy$_$$_WeldClientProxy.java)
	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 com.sun.el.parser.AstValue.invoke(AstValue.java:254)
	at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
	at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:39)
	at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
	at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
	at javax.faces.component.UICommand.broadcast(UICommand.java:315)
	at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
	at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
	at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
	at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
	at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
	at java.lang.Thread.run(Thread.java:680)

Java:

package de.org.grp.back;

import de.org.grp.domain.Customer;
import de.org.grp.sl.CustomerService;
import javax.enterprise.inject.Model;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import java.util.Collection;

@Model
public class Initializer {

    @Inject
    CustomerService custService;

    public void executeCustomerActivities() {
        Customer customer = null;
        customer = custService.createCustomer("Michael Green", 54321);
}

Java:

package de.org.grp.sl;
import de.org.grp.domain.Customer;
import javax.ejb.Stateless;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import java.util.Collection;

@Stateless
public class CustomerService {

    @PersistenceContext(unitName = "CustomerService")
    private EntityManager em;

    public Customer createCustomer(String name, long salary) {
        Customer customer = new Customer();
        customer.setName(name);
        customer.setSalary(salary);
        em.persist(customer);
        return customer;
    }

}

[XML]<persistence-unit name="CustomerService" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<jta-data-source>jdbc/DerbyJPACertDB</jta-data-source>
<properties>
<property name="eclipselink.target-server" value="SunAS9"/>
<property name="eclipselink.target-database"
value="org.eclipse.persistence.platform.database.DerbyPlatform"/>
<property name="eclipselink.logging.level" value="ALL"/>
<property name="eclipselink.ddl-generation" value="drop-and-create-tables"/>
<property name="eclipselink.ddl-generation.output-mode" value="both"/>
</properties>
</persistence-unit>
</persistence>[/XML]

Marcinek · 20. Jan 2013

Wie sieht die Methode getId () aus?

KSG9|sebastian · 20. Jan 2013

Vermutlich ist die ID null und durch dein Format-Pattern wird versucht null als (int) zu behandeln, was wiederum beu null zu einer NPE führt

Raphalon · 20. Jan 2013

Die Entität Customer sieht folgendermaßen aus.

Java:

package de.org.grp.domain;
import javax.persistence.*;
import java.io.Serializable;

@Entity
@NamedQuery(name = "findCustomerByName",
        query = "SELECT c FROM Customer c WHERE c.name = :nameParam")
public class Customer implements Serializable {

    @Id
    @TableGenerator(name="CustIdGen",
            table="ID_CUSTOMER",
            pkColumnName="GEN_NAME",
            valueColumnName="GEN_VAL")
    @GeneratedValue(generator="CustIdGen")
    private Long id;

    @Column
    private String name;

    @Column
    private long salary;

    public Customer() { }

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public long getSalary() {
        return salary;
    }
    public void setSalary(long salary) {
        this.salary = salary;
    }
    @Override
    public String toString() {
        return "Customer id: " + getId() + " name: " + getName() + " salary: " + getSalary();
    }
}

Sym · 20. Jan 2013

Deine Getter/Setter sollen mit Long und nicht mit long arbeiten.

Raphalon · 20. Jan 2013

Ja, mit Long läuft es. Kannst Du mir noch erläutern, warum ein Primitive an dieser Stelle einen solchen Fehler hervorruft?

KSG9|sebastian · 20. Jan 2013

ID istvom Typ Long, der getter vom Typ long. Dadurch findet ein Ato-Unboxing statt, wass bei ID=null. zu einer NPE führt

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NPE beim Persistieren einer Entität

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