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java.lang.NumberFormatException: ?	at java.lang.Integer.parseInt(Integer.java:409)	at java.lang.Integer.(Integer.java:544)	at org.hsqldb.Column.convertString(Column.java:986)	at org.hsqldb.Expression.getValue(Expression.java:670)	at org.hsqldb.Parser.getValue(Parser.java:851)	at org.hsqldb.Parser.processInsert(Parser.java:420)	at org.hsqldb.Database.execute(Database.java:252)