I'm having some problems integrating with my colleague's code.
He has an entity class, let's call it FooEntity:
@Entity
@XmlRootElement
@Table(name = "...")
public class FooEntity implements Serializable {
private static final long serialVersionUID = ...;
...
@Lob
@Column(name = "OBJBYTES")
private Serializable objBytes;
...
}
He is creating his DTO object
public class FooDTO implements Serializable {
private static final long serialVersionUID = ...;
...
private Serializable obj;
...
}
via helper class
public class FooHelper {
...
public static Serializable createSBar() {
Bar bar = generateBar();
Serializable sBar = bar;
return sBar;
}
...
}
that creates a Bar object that implements Serializable interface:
public class Bar implements Serializable {
private static final long serialVersionUID = ...;
private String myString;
private byte[] myBytes;
}
In his DAO, he's creating entity object from his DTO object and saving it to database and retrieving entity object and mapping it to a DTO object.
On retrieving the list of entries that match certain criteria via Query#getResultList an InvalidClassException is thrown with this message:
Local Exception Stack:
Exception [EclipseLink-66] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Could not deserialize object from byte array.
Internal Exception: java.io.InvalidClassException: com.my.package.Bar; local class incompatible: stream classdesc serialVersionUID = 4849912519109332230, local class serialVersionUID = -1015090985675288072
Mapping: org.eclipse.persistence.mappings.DirectToFieldMapping[objBytes-->FOO_TABLE.OBJBYTES]
Descriptor: RelationalDescriptor(com.my.package.entity.FooEntity --> [DatabaseTable(FOO_TABLE)])
at org.eclipse.persistence.exceptions.DescriptorException.notDeserializable(DescriptorException.java:1218)
at org.eclipse.persistence.mappings.converters.SerializedObjectConverter.convertDataValueToObjectValue(SerializedObjectConverter.java:72)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.getAttributeValue(AbstractDirectMapping.java:699)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.valueFromRow(AbstractDirectMapping.java:1299)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.buildCloneFromRow(AbstractDirectMapping.java:1258)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1548)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1694)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:664)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:560)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:717)
at org.eclipse.persistence.queries.ReadObjectQuery.registerResultInUnitOfWork(ReadObjectQuery.java:778)
at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:457)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1081)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1040)
at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:418)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1128)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2871)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1516)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1498)
at org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:323)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2098)
at org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1695)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:1987)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.buildCloneFromRow(ForeignReferenceMapping.java:276)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoWorkingCopyClone(ObjectBuilder.java:1548)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneFromRow(ObjectBuilder.java:1694)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:664)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:601)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:560)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:717)
at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:769)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:433)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1081)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1040)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:392)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1128)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2871)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1516)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1498)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1463)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:485)
at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:742)
at com.my.package.dao.FooDAO.getRange(FooDAO.java:584)
...
Caused by: java.io.InvalidClassException: com.my.package.Bar; local class incompatible: stream classdesc serialVersionUID = 4849912519109332230, local class serialVersionUID = -1015090985675288072
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:560)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1599)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1494)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1748)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1327)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
at org.eclipse.persistence.mappings.converters.SerializedObjectConverter.convertDataValueToObjectValue(SerializedObjectConverter.java:70)
... 165 more
It may also be relevant to note that when deploying the app in Glassfish 3.1.2.2, the following messages are displayed in the log:
[#|2014-06-05T12:39:01.301+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.FooEntity actually got transformed|#]
[#|2014-06-05T12:39:01.310+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo2Entity actually got transformed|#]
[#|2014-06-05T12:39:01.316+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo3Entity actually got transformed|#]
[#|2014-06-05T12:39:01.322+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo4Entity actually got transformed|#]
[#|2014-06-05T12:39:01.327+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo5Entity actually got transformed|#]
[#|2014-06-05T12:39:01.332+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo6Entity actually got transformed|#]
[#|2014-06-05T12:39:01.337+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo7Entity actually got transformed|#]
[#|2014-06-05T12:39:01.345+0200|INFO|glassfish3.1.2|javax.enterprise.system.core.classloading.com.sun.enterprise.loader|_ThreadID=28;_ThreadName=Thread-2;|com.my.package.entity.Foo8Entity actually got transformed|#]
Could someone explain why this exception is occurring and how to solve it? Also, I'm assuming it's not a good practice to use entity objects as JAXB objects, right?
As the error message shows:
Internal Exception: java.io.InvalidClassException: com.my.package.Bar; local class incompatible: stream classdesc serialVersionUID = 4849912519109332230, local class serialVersionUID = -1015090985675288072
There seem to be two different serialVersionUIDs, this seems to cause the error. You have to find out why there are different values, maybe the value was changed in the meantime.