java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.hsqldb.Session.execute(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.(Unknown Source)
at org.hsqldb.jdbc.JDBCCallableStatement.(Unknown Source)
at com.acme.HsqlTest.test(HsqlTest.java:42)

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