javax.jdo.JDOUserException: An instance was concurrently modified in another tra nsaction (optimistic lock #: 5). FailedObject:91653

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Optimistic transactions

An instance was concurrently modified in another tra nsaction (optimistic lock #: 5). FailedObject:91653

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Concurrent modification jdo exception

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javax.jdo.JDOUserException: An instance was concurrently modified in
another tra
nsaction (optimistic lock #: 5).
FailedObject:91653	at com.solarmetric.kodo.impl.jdbc.ormapping.ClassMapping$1.afterUpdate(ClassMapping.java:611)	at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatementNonBatch(SQLExecutionManagerImpl.java:563)	at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executePreparedStatement(SQLExecutionManagerImpl.java:512)	at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.executeInternal(SQLExecutionManagerImpl.java:406)	at com.solarmetric.kodo.impl.jdbc.SQLExecutionManagerImpl.flush(SQLExecutionManagerImpl.java:273)	at com.solarmetric.kodo.impl.jdbc.runtime.JDBCStoreManager.flush(JDBCStoreManager.java:421)	at com.solarmetric.kodo.runtime.PersistenceManagerImpl.flush(PersistenceManagerImpl.java:549)	at com.solarmetric.kodo.runtime.PersistenceManagerImpl.commit(PersistenceManagerImpl.java:412)	at com.factor3.aml.util.Thomson.process02Line(Thomson.java:184)	at com.factor3.aml.util.Thomson.parseFile(Thomson.java:67)	at com.factor3.aml.util.Thomson.main(Thomson.java:479)