I have following entity which has composite primary keys: @Entity @Table(name="TM_X_CD_X_TYPE", schema="APPL_DEV") @IdClass(TemplateXPCodeXTypePK.class) public class TemplateXPCodeXType implements Serializable { @Id @Column(name="TEMPLATE_ID") private long templateId; @Id @Column(name="PP_CODE_ID") private long ppCodeId; @Id @Column(name="PT_CODE") private String planTypeCode; public TemplateXPCodeXType(){} public TemplateXPCodeXType(long templateId, long ppCodeId,String planTypeCode) { this.ppCodeId = ppCodeId; this.planTypeCode = planTypeCode; this.templateId = templateId; } //getters and setters } Here is the Id class: public class TemplateXPCodeXTypePK implements Serializable { private long templateId; private long ppCodeId; private String planTypeCode; public TemplateXPCodeXTypePK(){} public TemplateXPCodeXTypePK(long templateId,long ppCodeId,String planTypeCode) { this.templateId = templateId; this.ppCodeId = ppCodeId; this.planTypeCode= planTypeCode; } public boolean equals(Object obj) { if(obj == null) return false; if(obj == this) return true; if(!(obj instanceof TemplateXPCodeXTypePK)) return false; TemplateXPCodeXTypePK pk = (TemplateXPCodeXTypePK)obj; if(templateId !=pk.getTemplateId()) return false; if(ppCodeId != pk.getPpCodeId()) return false; if(!planTypeCode.equals(pk.getPlanTypeCode())) return false; return true; } public int hashCode() { return (int)templateId + (int)ppCodeId + planTypeCode.hashCode(); } //getters and setters } Upon saving of TemplateXPCodeXType entity bean, I always get the following Invalid Identifier error: Caused by: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:67) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:253) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:237) at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:141) at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:298) at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27) at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000) at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338) at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:515) ... 171 more Caused by: java.sql.BatchUpdateException: ORA-00904: "PLANTYPECODE": invalid identifier at oracle.jdbc.driver.DatabaseError.throwBatchUpdateException(DatabaseError.java:343) at oracle.jdbc.driver.OraclePreparedStatement.executeBatch(OraclePreparedStatement.java:10720) at org.jboss.resource.adapter.jdbc.WrappedStatement.executeBatch(WrappedStatement.java:519) at org.hibernate.jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:48) at org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:246) Any help is greatly appreciated. Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172288#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...