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

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This exception has no message.
java.lang.NullPointerException:
at com.solarmetric.kodo.impl.jdbc.runtime.JDBCQuery.getExpression(JDBCQuery.java:184)
at com.solarmetric.kodo.query.QueryImpl.executeWithMap(QueryImpl.java:575)
at com.solarmetric.kodo.query.QueryImpl.execute(QueryImpl.java:428)
at com.solarmetric.kodo.query.QueryImpl$SynchronizedQuery.execute(QueryImpl.java:1331)
at com.ysoft.jdo.book.rental.ejb.service.impl.ReservationServiceEJB.getAvailableRentals(ReservationServiceEJB.java:119)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:77)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:107)
at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:178)
at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:60)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:313)
at org.jboss.ejb.Container.invoke(Container.java:712)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:517)
at java.lang.reflect.Method.invoke(Native Method)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:241)
at sun.rmi.transport.Transport$1.run(Transport.java:152)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:148)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:465)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:706)
at java.lang.Thread.run(Thread.java:484)

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