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David Harkness
 Post subject: Embedded object containing another embedded object gives NPE
PostPosted: Mon Sep 27, 2010 12:12 pm 
Newbie

Joined: Thu Nov 04, 2004 6:00 pm
Posts: 8
Location: Palo Alto, CA
I have an embeddable object YearModel that gets embedded into Impression which is itself an embeddable object. In Impression I map YearModel's columns to the correct names and mark all fields as allowing null. Finally, Impression is embedded in Lead.
Code:
@Embeddable
public class YearModel implements Serializable {
    ... fields: make, model, year, yearModelId ...
}

@Embeddable
public class Impression implements Serializable
{
    ...
    @Embedded
    @AttributeOverrides({
        @AttributeOverride(name = "make", column = @Column(name = "make_name", nullable = true)),
        @AttributeOverride(name = "model", column = @Column(name = "model_name", nullable = true)),
        @AttributeOverride(name = "year", column = @Column(name = "year_id", nullable = true)),
        @AttributeOverride(name = "yearModelId", column = @Column(name = "year_model_id", nullable = true))
    })
    private YearModel yearModel;
    ...
}

@Entity
@Table(name = "lead")
public class Lead implements Serializable
{
    ...
    @Embedded
    private Impression impression = null;
    ...
}
This works fine as long as both impression and its yearModel are non-null. But when the lead inside the impression is null, I get a NPE when persisting the Lead:
Code:
org.hibernate.PropertyAccessException: could not get a field value by reflection getter of com.hgm.leads.model.YearModel.make   org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:35)
   org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:64)
   org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:70)
   org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:86)
   org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:353)
   org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:348)
   org.hibernate.type.TypeFactory.replaceAssociations(TypeFactory.java:556)
   org.hibernate.type.TypeFactory.replaceAssociations(TypeFactory.java:557)
   org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:366)
   org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:195)
   org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener.entityIsTransient(IdTransferringMergeEventListener.java:59)
   org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:123)
   org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53)
   org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
   org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
   org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665)
   com.hgm.leads.dao.hibernate.LeadDaoHibernate.storeLead(LeadDaoHibernate.java:29)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   $Proxy56.storeLead(Unknown Source)
   com.hgm.leads.LeadServiceImpl.createLead(LeadServiceImpl.java:58)
   com.hgm.leads.LeadServiceAbstract.createLead(LeadServiceAbstract.java:20)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
   $Proxy60.createLead(Unknown Source)
   com.hgm.leads.http.CreateLeadServlet.testCreateLeadWithoutYearModel(CreateLeadServlet.java:65)
   com.hgm.leads.http.CreateLeadServlet.doGet(CreateLeadServlet.java:33)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

root cause

java.lang.NullPointerException
   sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:36)
   sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:18)
   java.lang.reflect.Field.get(Field.java:358)
   org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:32)
   org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:64)
   org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:70)
   org.hibernate.tuple.component.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:86)
   org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:353)
   org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:348)
   org.hibernate.type.TypeFactory.replaceAssociations(TypeFactory.java:556)
   org.hibernate.type.TypeFactory.replaceAssociations(TypeFactory.java:557)
   org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:366)
   org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:195)
   org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener.entityIsTransient(IdTransferringMergeEventListener.java:59)
   org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:123)
   org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:53)
   org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:677)
   org.hibernate.impl.SessionImpl.merge(SessionImpl.java:661)
   org.hibernate.impl.SessionImpl.merge(SessionImpl.java:665)
   com.hgm.leads.dao.hibernate.LeadDaoHibernate.storeLead(LeadDaoHibernate.java:29)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
   org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
   org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
   org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
   $Proxy56.storeLead(Unknown Source)
   com.hgm.leads.LeadServiceImpl.createLead(LeadServiceImpl.java:58)
   com.hgm.leads.LeadServiceAbstract.createLead(LeadServiceAbstract.java:20)
   sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   java.lang.reflect.Method.invoke(Method.java:597)
   org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
   org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:196)
   $Proxy60.createLead(Unknown Source)
   com.hgm.leads.http.CreateLeadServlet.testCreateLeadWithoutYearModel(CreateLeadServlet.java:65)
   com.hgm.leads.http.CreateLeadServlet.doGet(CreateLeadServlet.java:33)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
   javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
Impression was originally an @Entity itself, but I could not get the @OneToOne association between it and Lead to work and embedded it inside Lead. Before that, YearModel worked fine embedded inside Impression even when it was null. The problem only arose once I changed Impression to be emdedded.

I tried copying the @AttributeOverrides from Impression to Lead and even prefixing their names with "yearModel." but no dice. It seems that Hibernate does not realize that all of YearModel's fields can be null and doesn't think to check if yearModel itself is null before accessing them.
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nile
 Post subject: Re: Embedded object containing another embedded object gives NPE
PostPosted: Tue Oct 12, 2010 5:04 am 
Newbie

Joined: Tue Oct 12, 2010 4:05 am
Posts: 2
Hi,

I am new to hibernate and JPA annotation world. I have the same scenario as you describe but in place of class which you have embedded i have interface. where i am failing is when i embed the other interface within another embedded class, it tells declared interface property not found while building entity manager.

For example:
@Entity
@Name ("myEntity")
public class MyEntity{
......
@Embedded
@Target(MyTestClass.class)
private MyTest myTest;
.....
}

public interface MyTest {
......
}

@Embeddable
public class MyTestClass implements MyTest {
......
@Embedded
@Target(MyTestClass2.class)
private MyTest2 myTest2;
}

public interface MyTest2 {
......
}

@Embeddable
public class MyTestClass2 implements MyTest {
......
}

when executing test cases, i am getting "org.hibernate.PropertyNotFoundException: field [myTest2] not found"
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