please see the following error..and tell me on what lines should i start thinking. 
This error is coming on a particular users machine ..and doesnt come at other 
locations:


Error: 500

   Location: /servlet/NROptions

   Internal Servlet Error:

   java.lang.OutOfMemoryError:

              at
java.lang.StringBuffer.expandCapacity(StringBuffer.java)

              at java.lang.StringBuffer.append(StringBuffer.java)

              at NRConfig.getMonths(NRConfig.java:4760)

              at NRConfig.printChartTimes(NRConfig.java:3732)

              at NRConfig.getDLTinfo(NRConfig.java:347)

              at NROptions.ListOptions(NROptions.java:426)

              at NROptions.doGet(NROptions.java:29)

              at
javax.servlet.http.HttpServlet.service(HttpServlet.java:740)

              at
javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

              at
org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)

              at
org.apache.tomcat.core.Handler.service(Handler.java:287)

              at
org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)

              at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.jav
a:812)                                             
              at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:758)

              at
org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnec
tion(Ajp13ConnectionHandler.java:160)              
              at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416
)                                                  
              at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:50
1)                                                 
              at java.lang.Thread.run(Thread.java)

 



 
This is really important to me..
i hope to get some mails which will let me analyse the problem well.
regards
anil 
PS:i am newbie to java and tomcat

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