Query Executor Problem

Hi,
Our web based application which is using postgresql version 7.1.3  is
showing an error as follows.

 java.lang.NullPointerException
        at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:61)
        at org.postgresql.Connection.ExecSQL(Connection.java:398)
        at org.postgresql.jdbc2.Statement.execute(Statement.java:130
        at org.postgresql.jdbc2.Statement.executeQuery(Statement.java:54)
        at
com.ebusinessoft.gen.db.DatabaseUtilities.getQueryResults(DatabaseUtilities.java:71)
        at com.ebusinessoft.ifos.rsmt.gentrip.doGet(gentrip.java:124)
        at com.ebusinessoft.ifos.rsmt.gentrip.doPost(gentrip.java:448)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
        at
org.apache.tomcat.service.connector.Ajp12ConnectionHandler.processConnection(Ajp12ConnectionHandler.java:166)
        at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
        at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)


This type of message occurs at random and we could not assess the reason for
this. We greatly  appreciate your help on this.

Thanks
Support
support@ebusinessoft.com