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<p style="margin: 10px 0 0 0">Today I'm getting the same problem with Hibernate 4.3.8.Final. I have no idea how to reproduce it in a test case.</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">java.lang.NullPointerException
at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:155)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:91)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:55)
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<p style="margin: 10px 0 0 0">Before, I'm deleting a number of entities, evict some from the cache, and then call flush().</p>
<p style="margin: 10px 0 0 0">With assertions enabled, I get following, when evicting entities (one step before the above flush):</p>
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap">Caused by: java.lang.AssertionError
at org.hibernate.engine.internal.EntityEntryContext.removeEntityEntry(EntityEntryContext.java:223)
at org.hibernate.engine.internal.StatefulPersistenceContext.removeEntry(StatefulPersistenceContext.java:436)
at org.hibernate.event.internal.DefaultEvictEventListener.onEvict(DefaultEvictEventListener.java:93)
at org.hibernate.internal.SessionImpl.fireEvict(SessionImpl.java:1174)
at org.hibernate.internal.SessionImpl.evict(SessionImpl.java:1167)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.detach(AbstractEntityManagerImpl.java:1430)
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