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java.lang.OutOfMemoryError: Java heap space	at java.lang.AbstractStringBuilder.(Unknown Source)	at java.lang.StringBuffer.(Unknown Source)	at org.hsqldb.persist.LockFile$HeartbeatRunner.run(Unknown Source)	at org.hsqldb.lib.HsqlTimer$TaskRunner.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)