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java.lang.UnsupportedOperationException: Result lists are read-only.	at org.apache.openjpa.lib.rop.AbstractResultList.readOnly(AbstractResultList.java:43)	at org.apache.openjpa.lib.rop.AbstractResultList.clear(AbstractResultList.java:80)	at org.apache.openjpa.kernel.DelegatingResultList.clear(DelegatingResultList.java:250)	at controller.TransactionListController.reset(TransactionListController.java:33)