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mdef
 Post subject: Deserialization Exception when mapping to arrays in entities
PostPosted: Wed Apr 23, 2008 7:56 am 
Newbie

Joined: Wed Apr 23, 2008 7:10 am
Posts: 2
Hi everyone!

I'm using a generic object which contains an ID, a name and an Object[].

Code:
@Entity
@Cache(usage = CacheConcurrencyStrategy.READ_ONLY)
@Immutable
public class MyGenericObject {

   @Id
   public Long getId();
   public void setId(Long theID);

   @Basic(optional = true)
   Object[] getData();
   void setData(Object[] data);

   String getName();
   void setName(String name);
}


Now, I want to fill the object with a native query:
Code:
entityManager.createNativeQuery(
   "SELECT lex_fk AS id, lex_name AS name, lex_min as data{0}, lex_max as data{1} FROM `tblex` WHERE lex_name <> '';",
   MyGenericObject.class).getResultList();


As you can see, lex_min should be the first element of the MyGenericObject.data Array, lex_max the second. I'm not sure if the syntax I use is correct, but I've seen it in other posts. Anything else I tried didn't even get me close to the result I see now.

Well, anyways it doesn't work. Here's the stacktrace:

Code:
javax.persistence.PersistenceException: org.hibernate.type.SerializationException: could not deserialize
   at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:630)
   at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:75)
   at ch.....getLex(...DAOImpl.java:77)
   at ch.....ServiceImpl.getLex(...ServiceImpl.java:45)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:296)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:177)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:107)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:166)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   at $Proxy18.getLeadershipExperience(Unknown Source)
   at ch.....HibernateTest.TestStaticTables(...HibernateTest.java:86)
Caused by: org.hibernate.type.SerializationException: could not deserialize
   at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:217)
   at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:240)
   at org.hibernate.type.SerializableType.fromBytes(SerializableType.java:82)
   at org.hibernate.type.SerializableType.get(SerializableType.java:39)
   at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
   at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:154)
   at org.hibernate.type.AbstractType.hydrate(AbstractType.java:81)
   at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2096)
   at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1380)
   at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1308)
   at org.hibernate.loader.Loader.getRow(Loader.java:1206)
   at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:580)
   at org.hibernate.loader.Loader.doQuery(Loader.java:701)
   at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
   at org.hibernate.loader.Loader.doList(Loader.java:2220)
   at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
   at org.hibernate.loader.Loader.list(Loader.java:2099)
   at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289)
   at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695)
   at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
   at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
   at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:66)
   ... 36 more
Caused by: java.io.EOFException
   at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
   at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
   at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
   at java.io.ObjectInputStream.<init>(Unknown Source)
   at org.hibernate.util.SerializationHelper$CustomObjectInputStream.<init>(SerializationHelper.java:252)
   at org.hibernate.util.SerializationHelper.deserialize(SerializationHelper.java:209)


Can anyone help me out here or point me to the relevant section of the documentation? So far my search for this didn't yield any results...

Thanks in advance,
Jan-Philipp
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mdef
 Post subject:
PostPosted: Wed Apr 23, 2008 10:10 am 
Newbie

Joined: Wed Apr 23, 2008 7:10 am
Posts: 2
I still don't know if there is any way to do this automatically, but I have solved the problem by creating a custom mapping like this:

Code:
@SqlResultSetMappings({
   @SqlResultSetMapping(
      name = "MyGenericObjectDataMapping",
      entities = {
         @EntityResult(entityClass = MyGenericObject.class)
      },
      columns = {
         @ColumnResult(name = "data1"),
         @ColumnResult(name = "data2")
      }
   )})


and using a custom conversion method to put the data where it belongs:

Code:
private List<MyGenericObject> createMyGenericObjectList(List<Object[]> results) {
   List<MyGenericObject> genObjects = new ArrayList<MyGenericObject>();
   for (Object[] result : results) {
      MyGenericObject genObject = (MyGenericObject)result[0];
      if (genObject!= null) {
         Object[] data = new Object[] {result[1], result[2]};
         genObject.setData(data);
         genObjects.add(ontObject);
      }
   }
   return genObjects;
}


I don't think that this is really the way it is supposed to be, but it works. I'd still be thankful if anybody comes up with a better solution.

Best regards,
Jan-Philipp
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