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Why doesn't this work 1

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SalShaikh

SalShaikh

Programmer
May 15, 2002
16
US
Can anyone tell me why the above code doesn't work and give me the following error and the bottom code does.

Thanks


///////////////////////////////////
NOT WORKING CODE
///////////////////////////////////

<!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0 Transitional//EN&quot;>
<%@ page language=&quot;java&quot; %>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<%! String sal = request.getParameter(&quot;username&quot;); %>
<%= sal%><br/>
</body>
</html>

///////////////////////////////////
THE ERROR RETURNED:
///////////////////////////////////


jrunx.compiler.DefaultCFE: Compiler errors:
Found 1 semantic error compiling &quot;C:/JRun4/servers/scwaLab/default-ear/default-war/WEB-INF/jsp/jrun__test2ejsp9.java&quot;:

63. String sal = request.getParameter(&quot;username&quot;);
<----->
*** Error: &quot;request&quot; is either a misplaced package name or a non-existent entity.

at jrunx.compiler.JavaCompiler.compile(JavaCompiler.java:138)
at jrunx.compiler.JavaCompiler.compile(JavaCompiler.java:97)
at jrun.jsp.Translator.compilePage(Translator.java:176)
at jrun.jsp.Translator.translate(Translator.java:254)
at jrun.jsp.Translator.translate(Translator.java:101)
at jrun.jsp.JSPEngine.translateJSP(JSPEngine.java:693)
at jrun.jsp.JSPServlet.translate(JSPServlet.java:125)
at jrun.jsp.JSPServlet.service(JSPServlet.java:113)
at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)
at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:252)
at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:527)
at jrun.servlet.http.WebService.invokeRunnable(WebService.java:168)
at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:451)
at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)

javax.servlet.ServletException: Translator.CompilationFailedExceptionCompiler errors:
Found 1 semantic error compiling &quot;C:/JRun4/servers/scwaLab/default-ear/default-war/WEB-INF/jsp/jrun__test2ejsp9.java&quot;:

63. String sal = request.getParameter(&quot;username&quot;);
<----->
*** Error: &quot;request&quot; is either a misplaced package name or a non-existent entity.

at jrun.jsp.Translator.compilePage(Translator.java:187)
at jrun.jsp.Translator.translate(Translator.java:254)
at jrun.jsp.Translator.translate(Translator.java:101)
at jrun.jsp.JSPEngine.translateJSP(JSPEngine.java:693)
at jrun.jsp.JSPServlet.translate(JSPServlet.java:125)
at jrun.jsp.JSPServlet.service(JSPServlet.java:113)
at jrun.servlet.ServletInvoker.invoke(ServletInvoker.java:91)
at jrun.servlet.JRunInvokerChain.invokeNext(JRunInvokerChain.java:42)
at jrun.servlet.JRunRequestDispatcher.invoke(JRunRequestDispatcher.java:252)
at jrun.servlet.ServletEngineService.dispatch(ServletEngineService.java:527)
at jrun.servlet.http.WebService.invokeRunnable(WebService.java:168)
at jrunx.scheduler.ThreadPool$ThreadThrottle.invokeRunnable(ThreadPool.java:451)
at jrunx.scheduler.WorkerThread.run(WorkerThread.java:66)


///////////////////////////////////
WORKING CODE
///////////////////////////////////

<!DOCTYPE HTML PUBLIC &quot;-//W3C//DTD HTML 4.0 Transitional//EN&quot;>
<%@ page language=&quot;java&quot; %>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<% String sal = request.getParameter(&quot;username&quot;); %>
<%= sal%><br/>
</body>
</html>
 
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I think that <%! String xx= something %> is converted to a servlet class &quot;field&quot;, therefore the methord call you're referencing is now available yet. Nor is is advisable to program any java class in such a way...
The exclamation mark is the key! do not use it in such situations....
for exmaple here is what you're trying to do:

class foo extends HttpServlet {

//here is where the it refuses to compile
string sal = request.getParameter(&quot;userName&quot;);

public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {

//your declation should be here...
}

Hope that helps....and someone shall correct me if i'm wrong...
 
Upvote 0 Downvote
Good advice libaax.

Essentially what happened is that the declarations appear before the methods are actually available. In your JSP page it may be better to do the following:

<%! //declerations
int x = 0;....
%>

<% //initialisations <-- different from declarations since they don't appear before!

String x = request.getParameter(&quot;x&quot;);
%>

Had a hard time figuring that one out.
 
Upvote 0 Downvote
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