Jsp call success, http 500 servlet not display

in the project, i have a HelloServlet in application sources
SayHello.jsp in Web content in JDeveloper, i successfully run them
result is sayhello pass parameter through get in form action called HelloServlet
But, After deployed to OC4J standalone
http://computer_name:8888/Helloworld-Exercise-root/SayHello.jsp
can successfully call, i type the name in field box
it appear http 500 when change to
http://computer_name:8888/Helloworld-Exercise-root/SayHello?person=baby
What's wrong with this? how to fix it?

I can successfully run in embedded oc4j and display the parameter i passed through text field, but error in standalone oc4j
http://192.168.0.1:8988/Helloworld-Exercise-root/SayHello.jsp
http://192.168.0.1:8988/Helloworld-Exercise-root/SayHello?person=mandy
The servlet has received a GET. This is the reply.
Hello, mandy!

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Hi, thanks for your help. However I think the problem his more complex than it seems. Here is my doPost method (the important parts anyway):
response.setCharacterEncoding("UTF-8"); //Not necessary because the next line should take care of it, but anyways...
response.setContentType("text/html; charset=UTF-8; pageEncoding=UTF-8");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<meta http-equiv='Content-Language' content='en-us'>");
out.println("<meta http-equiv='Content-Type' content='text/html; charset=utf-8; pageEncoding=utf-8'>"); //Again not necessary line, but anyways
out.println("<title>Servlet</title>");
out.println("</head>");
out.println("<body>");
out.println("this is a test 你好 this is a test");
out.println("</body>");
out.println("</html>");
out.close();
This servlet is called from a html file. Also, when I load this in the browser, I right click on the screen and I can see that UTF-8 is setup allright. Doing some detective job I found that:
- If the editor displays the characters perfectly and...
- Other html pages (no servlets) in the same application can display chinese characters well and...
- I have configured the encoding as UTF-8 in the servlet properties and in general properties and...
- The file "web.xml" contains the encoding UTF-8 in its first line then...
...my only guess is that something goes wrong during the building of the project itself (ant?). Unfortunately I have no idea about configuring ant to that level, but I began to think that the problem may be there, during the compilation...
Any ideas?
Once more, thanks for any help or advice provided.
Aral.

Jsp call success, http 500 servlet not display

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