Internal Server Error - Null Pointer

Hi,
I'm trying to modify the FedEX API sample code from an applet to a servlet. I'm running into an error, which I can't decipher at all.
If anyone can point me in the right direction in trying to figure out this error, it would be great.
Some background, the file compiles fine, and I can even import com.fedex.api.*; in my servlet without problems, but when I actually call the FedExAPI method the servlet throws the internal server error.
The method FedExAPI.transact interacts with a server that I am running, and returns a byte array. The server is running fine, since I can run the applet test code and get a response from it.
Here is the code

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.fedex.api.*;
public class handleTransaction extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws IOException, ServletException
    {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
//This is a FedEx Express Ship-A-Package request
//pass: byte array
java.lang.String taggedRequest = new java.lang.String("2016:0,\"021\"4,\"Total Widget Rebuilders\"5,\"445 East Street\"7,\"Dallas\"8,\"TX\"9,\"75247\"10,\"123456789\"498,\"123567\"117,\"US\"183,\"2145558765\"50,\"US\"11,\"ABC Widget\"12,\"Bernard F. Smith\"13,\"322 Latta Woods\"14,\"Suite 26\"15,\"Roanoke\"16,\"VA\"17,\"24012\"18,\"7035551212\"23,\"1\"1401,\"4.0\"1273,\"03\"1274,\"03\"25,\"SPECIAL CALL-IN\"24,\"20000103\"51,\"Y\"1115,\"130555\"1368,\"1\"1369,\"1\"1370,\"5\"1116,\"I\"75,\"LBS\"3025,\"FDXE\"1333,\"1\"99,\"\"");
byte[] sendTaggedRequest = taggedRequest.getBytes();
//This is the UTI (Universal Transaction Code)
//pass: integer
int UTI = 2016;
byte[] ReplyOut = new byte[0];
out.println("Sending Transaction.\n");
try
{
ReplyOut = FedExAPI.transact(UTI, sendTaggedRequest, "mydomain.com", 8190, 125);
}
catch (FedExAPIException e)
{
out.println("Is this the exception??" + e.getMessage());
}

//Print reply here
out.println(ReplyOut.toString());
    }
}

Here is the error I get when I try to access the servlet in my browser.

<html><head><title>Apache Tomcat/4.0.3 - Error report</title><STYLE></STYLE> </head><body><h1>Apache Tomcat/4.0.3 - HTTP Status 500 - Internal Server Error</h1><HR size="1" noshade>type Exception reportmessage Internal Server Errordescription The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.exception <pre>java.lang.NullPointerException
at handleTransaction.doGet(handleTransaction.java:41)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:197)
at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:172)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:429)
at org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:495)
at java.lang.Thread.run(Thread.java:536)
</pre><HR size="1" noshade></body></html>

So - what is in line 41 that could be null??
Why don't you have try/catch provision in your doGet for better error reporting?
Bill

Well, here is line 41 from my text editor.

I don't know how to add a try/catch to my doGet. I just gave it a go and got an exception is never thrown in the body error on compile. I'll hunt around on how to do that, and see what happens.
Thanks!

Adding the correct try/catch got rid of that horrible error that the browser spit out.
Thanks!
Now, in my log file, I see my real problem, I think.

I'm trying to grant all permissions to my webapps with no luck. I'm on an Ensim server, and their setup is custom and hard to follow. I think I'm on the right track though...
Thanks again.

Got the permissions fixed. The FedEx API need all socket permissions granted.
Thanks again!

Thank you very much.The error is where you have said.I tried to find out the error by using a try /catch block.The mistake I have made is I have been using data.put("userid") instead of data.put(userid) and it happens I did not see it all day.Thanx.