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[JSP] AssignmentOperator Expression Error


Question

I've got this error when i try to run this JSP file.

type Exception report

message

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

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 17 in the jsp file: /JSP/helloworld.jsp
Syntax error, insert "AssignmentOperator Expression" to complete ForUpdate
14: 	public String writeThis(int x)
15: 	{
16: 		String myText="";
17: 		for (int i = 1; i < x; i)
18: 		{
19: 			myText = myText;
20: 			return myText;


Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:415)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:308)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

AND this is my JSP code.

<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>...</title>
</head>

<body>
<font face="Verdana, Arial, Helvetica, sans-serif" color="darkblue">
JSP Loop
<br /><br />
<%!
	public String writeThis(int x)
	{
		String myText="";
		for (int i = 1; i < x; i)
		{
			myText = myText;
			return myText;
		}
	}
%>
This is an loop example:
<br />
<%= writeThis(8) %>


</font>
</body>
</html>

Anything wrong with this code ?

Thanks..

Nikas

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2 answers to this question

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"i" by itself is not a valid statement in Java. I'm guessing you meant to use i++ for the common for loop. Change

for (int i = 1; i < x; i)

to

for (int i = 1; i < x; i++)

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If i change to i++, another error will occurs.

type Exception report

message

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

exception

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 14 in the jsp file: /JSP/helloworld.jsp
This method must return a result of type String
11: JSP Loop
12: <br /><br />
13: <%!
14: 	public String writeThis( int x )
15: 	{
16: 		String myText="";
17: 		for ( int i = 1; i < x; i++ )


Stacktrace:
	org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85)
	org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
	org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:415)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:308)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:273)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:308)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.10 logs.

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