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Hello everyone: 
i configured two entity,mapped with oneToMany and manyToOne。 and i want
merge one enity and the 
another entity could cascade merge. but it didn't work. an exception
occured. i can't confirm this exception whether reasonable! 
@Entity 
@Table(name="point_appcard") 
public class PointAppCardEntity { 
    
        @Id 
        @GeneratedValue(strategy=GenerationType.IDENTITY) 
        private long appid;         
    
  private Date created = Calendar.getInstance().getTime(); 
        
        private Date modified = Calendar.getInstance().getTime(); 
        
       
@OneToMany(mappedBy="appCard",fetch=FetchType.EAGER,cascade=CascadeType.MERGE) 
        private List<PointCardEntity> cards; 
} 

@Entity 
@Table(name="point_card") 
public class PointCardEntity { 
    
    @Id 
    private String cardno; 
    
    
    private Date created = Calendar.getInstance().getTime(); 
    
    private Date modified = Calendar.getInstance().getTime(); 
    
    
    @ManyToOne(fetch=FetchType.EAGER,cascade={CascadeType.MERGE}) 
    @JoinTable(name="point_carddetail", 
        joinColumns=@JoinColumn(name="cardno",
referencedColumnName="cardno"), 
        inverseJoinColumns=@JoinColumn(name="appid",
referencedColumnName="appid")) 
} 


and the full stack trace is: 

<openjpa-2.2.1-runknown nonfatal store error>
org.apache.openjpa.util.StoreException: 

org.apache.openjpa.util.java$util$Date$proxy cannot be cast to 

org.apache.openjpa.enhance.PersistenceCapable 
        at
org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:2000) 
        at org.apache.openjpa.kernel.LocalManagedRuntime.commit 

(LocalManagedRuntime.java:81) 
        at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1516) 
        at
org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:933) 
        at org.apache.openjpa.persistence.EntityManagerImpl.commit 

(EntityManagerImpl.java:570) 
        at 

com.shangquan.test.pm.dao.TestPointAppCardDao.TestUpdatePointAppCardWithPointCard 

(TestPointAppCardDao.java:201) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
        at java.lang.reflect.Method.invoke(Unknown Source) 
        at junit.framework.TestCase.runTest(TestCase.java:154) 
        at junit.framework.TestCase.runBare(TestCase.java:127) 
        at junit.framework.TestResult$1.protect(TestResult.java:106) 
        at junit.framework.TestResult.runProtected(TestResult.java:124) 
        at junit.framework.TestResult.run(TestResult.java:109) 
        at junit.framework.TestCase.run(TestCase.java:118) 
        at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run 

(JUnit3TestReference.java:130) 
        at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests 

(RemoteTestRunner.java:467) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests 

(RemoteTestRunner.java:683) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run 

(RemoteTestRunner.java:390) 
        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main 

(RemoteTestRunner.java:197) 
Caused by: java.lang.ClassCastException:
org.apache.openjpa.util.java$util$Date$proxy 

cannot be cast to org.apache.openjpa.enhance.PersistenceCapable 
        at org.apache.openjpa.jdbc.meta.strats.RelationFieldStrategy.update 

(RelationFieldStrategy.java:374) 
        at
org.apache.openjpa.jdbc.meta.FieldMapping.update(FieldMapping.java:699) 
        at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.update 

(AbstractUpdateManager.java:343) 
        at
org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.populateRowManager 

(AbstractUpdateManager.java:174) 
        at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush 

(AbstractUpdateManager.java:97) 
        at org.apache.openjpa.jdbc.kernel.AbstractUpdateManager.flush 

(AbstractUpdateManager.java:78) 
        at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.flush(JDBCStoreManager.java:735) 
        at org.apache.openjpa.kernel.DelegatingStoreManager.flush 

(DelegatingStoreManager.java:131) 
        at org.apache.openjpa.kernel.BrokerImpl.flush(BrokerImpl.java:2176) 
        at
org.apache.openjpa.kernel.BrokerImpl.flushSafe(BrokerImpl.java:2074) 
        at
org.apache.openjpa.kernel.BrokerImpl.beforeCompletion(BrokerImpl.java:1992) 
        ... 21 more 






if anyone has encountered this exception before,any solutions avaliable? 
thanks very much 



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