java.lang.NoClassDefFoundError: com/db4o/ext/DatabaseFileLockedException

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java.lang.NoClassDefFoundError: com/db4o/ext/DatabaseFileLockedException
at org.springmodules.db4o.ObjectServerUtils.translateException(ObjectServerUtils.java:39)
at org.springmodules.db4o.Db4oAccessor.convertDb4oAccessException(Db4oAccessor.java:51)
at org.springmodules.db4o.Db4oTemplate.execute(Db4oTemplate.java:75)
at org.springmodules.db4o.Db4oTemplate.set(Db4oTemplate.java:160)

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