Hello,
> 1. Try em.createQuery("delete from A a")
I've tried this, but the error persists. The trace is:
Exception in thread "main" <openjpa-2.1.0-r422266:1071316 fatal general error>
org.apache.openjpa.persistence.PersistenceException: Multiple concurrent
threads attempted to access a single broker. By default brokers are not thread
safe; if you require and/or intend a broker to be accessed by more than one
thread, set the openjpa.Multithreaded property to true to override the default
behavior.
at
org.apache.openjpa.kernel.BrokerImpl.endOperation(BrokerImpl.java:1935)
at org.apache.openjpa.kernel.BrokerImpl.isActive(BrokerImpl.java:1883)
at
org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:468)
at
org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:668)
at
org.apache.openjpa.persistence.PersistenceExceptions$2.translate(PersistenceExceptions.java:76)
at
org.apache.openjpa.kernel.DelegatingQuery.translate(DelegatingQuery.java:99)
at
org.apache.openjpa.kernel.DelegatingQuery.deleteAll(DelegatingQuery.java:560)
at
org.apache.openjpa.persistence.QueryImpl.executeUpdate(QueryImpl.java:362)
at betriebsdaten.demo.OpenJpaDemo.main(OpenJpaDemo.java:28)
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