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Difficulty in compiling JSP

renu richard
Ranch Hand

Joined: Oct 06, 2008
Posts: 116
Hi, I have some problem in compiling JSP. Basically what i am trying to do is that 1)a servlet is setting an attribute [attribute name:choice] and then calling a JSP. Which is using that attribute [attribute name:choice]. I am getting an error as shown below.
[code]
HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /welcome.jsp at line 24

21: out.println( date );
22: out.println( "<BR>Your machine's address is " );
23: out.println( request.getRemoteHost());
24: ArrayList al =(ArrayList)request.getAttribute("choice");
25: Iterator it = al.iterator();
26: while (it.hasNext()){
27: %>


Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.example.Sample.doPost(Sample.java:17)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause

java.lang.ClassCastException: [Ljava.lang.String;
org.apache.jsp.welcome_jsp._jspService(welcome_jsp.java:79)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.example.Sample.doPost(Sample.java:17)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
---------------------------------------------------------------------------

Apache Tomcat/6.0.18



----------------------------------------------------------------------------
IN the servelt (code snippet) : String[] multiplechoice = request.getParameterValues("toon"); request.setAttribute("choice",multiplechoice); RequestDispatcher view = request.getRequestDispatcher("welcome.jsp");
--------------------------------------------------------------------------- Can someone please help me


Cheers,
Richard
Amit Ghorpade
Bartender

Joined: Jun 06, 2007
Posts: 2716
    
    6

As you can see from the stack trace and the code, you are setting an attribute of type String [] and then trying to cast it into an ArrayList, which won't do.


SCJP, SCWCD.
|Asking Good Questions|
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39791
    
  28
Appears to be duplicate of this thread. Closing
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39791
    
  28
Oh, it's not a duplicate, sorry.

The thread was moved to JSP and moved back.

Opening it again.
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: Difficulty in compiling JSP