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error after connecting to external appl running at a different port

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Hi All,

From a java web application, installed on Tomcat 4.018, we are accessing another application which runs on another port (through their API). Our application is developed on MVC based pattern. Now before accessing this external application the web application is working fine, but after accessing the external application we are getting this error if we access the web application:
Sep 21, 2004 4:35:34 PM org.apache.coyote.http11.Http11Processor process
SEVERE: Error processing request java.lang.NullPointerExceptionnull at java.io.Writer.write(Writer.java:126)
null at java.io.PrintWriter.newLine(PrintWriter.java:254)null at java.io.PrintWriter.println(PrintWriter.java:405)null
at java.io.PrintWriter.println(PrintWriter.java:516)null at org.apache.catalina.logger.LoggerBase.log(LoggerBase.java:290)null
at org.apache.coyote.tomcat4.CoyoteAdapter.log(CoyoteAdapter.java:628)null at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:230)null
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:432)null at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:386)null
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:534)null at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)null
at java.lang.Thread.run(Thread.java:536)null


We are not able to trace this, please help.

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How're you accessing this external application? Could you pls be more specific

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