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simple JSP program, error 500 file not found problem

7 replies on 1 page. Most recent reply: Sep 2, 2002 12:18 PM by Charles Bell

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Sid Northfield

Posts: 20
Nickname: northfield
Registered: Aug, 2002

simple JSP program, error 500 file not found problem

Posted: Aug 29, 2002 11:36 AM

Reply

Advertisement

Below is a simple JSP file,
the file is located at D:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\Hour8

<HTML><HEAD>&l t;TITLE>Overriding toString() Method</TITLE></HEAD><BODY>
<%@ page import="Hour8.OverridingToString"%>
<%! OverridingToString ots1 = new OverridingToString();
OverridingToString ots2 = new OverridingToString("New Message");
%>
<UL>
<LI>ots1 = <%=ots1%>
<LI>ots2 = <%=ots2%>
</UL>
</BODY></HEAD>
Below is simple Java file.
The file has been complied so thus both the source file and .class file is located at
D:\tomcat\jakarta-tomcat-3.3.1\webapps\ROOT\WEB-INF\classes\Hour8

Here is the source code:
public class OverridingToString{
String message = "Default Message";
public OverridingToString(){}
public OverridingToString(String msg){message = msg;}
public String toString(){ return message; }
}

Please note previous all inclusive JSP programs worked, that is java code and JSP code were all in one file.
Now I have a simple JSP and a Java file, this does not work.

I have started tomcat and accessing the jsp file at browser address:
http://localhost:8080/myJSPs/Hour8/overridingToString.jsp

Error: 500
Location: /myJSPs/Hour8/overridingToString.jsp
Internal Servlet Error:

org.apache.jasper.JasperException: Unable to compile D:\tomcat\jakarta-tomcat-3.3.1\work\DEFAULT\myJSPs\Hour8\overridingToString_1.j ava:6: Class Hour8.OverridingToString not found in import.
import Hour8.OverridingToString;
^
1 error

at org.apache.tomcat.facade.JasperLiaison.javac(JspInterceptor.java:898)
at org.apache.tomcat.facade.JasperLiaison.processJspFile(JspInterceptor.java:733)
at org.apache.tomcat.facade.JspInterceptor.requestMap(JspInterceptor.java:506)
at org.apache.tomcat.core.ContextManager.processRequest(ContextManager.java:968)
a t org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:875)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:833)
at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Http10Inte rceptor.java:176)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:494)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:5 16)
at java.lang.Thread.run(Thread.java:484)

Ana

Posts: 12
Nickname: anika
Registered: Aug, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Aug 30, 2002 4:10 AM

Reply

Hi northfield, you may try locating your .class file in another directory, since it seems that it is not found.
If you have a web application called "myJSPs", and two different directories:

D:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\jsp\Hour8
and
D:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\WEB-INF\classes\Hour8

Place your jsp in the first one, your .class in the second one, import the .class just as previously done and try:
http://127.0.0.1:8080/myJSPs/jsp/Hour8/overridingToString.jsp

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Aug 30, 2002 2:53 PM

Reply

Hey,
I noted that you have the class file located at:
D:\tomcat\jakarta-tomcat-3.3.1\webapps\ROOT\WEB-INF\classes\Hour8
That would work if your class was a member of the Hour8 package.

I think you have to either:

move the OverridingToString.class to the directory one up from Hour8 to
D:\tomcat\jakarta-tomcat-3.3.1\webapps\ROOT\WEB-INF\classes\

or

add the package command to your java source and recompile:
*******


package Hour8
public class OverridingToString{
String message = "Default Message";
public OverridingToString(){}
public OverridingToString(String msg){message = msg;}
public String toString(){ return message; }
}

Sid Northfield

Posts: 20
Nickname: northfield
Registered: Aug, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Aug 31, 2002 5:36 PM

Reply

it doesn't work.

Sid Northfield

Posts: 20
Nickname: northfield
Registered: Aug, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Aug 31, 2002 7:24 PM

Reply

My question is why does it seem to be so esotric in dividing JSP and class files seperately?

I am at the end my tether and really frustrated.
As I have tried with every known combinationss of folder combination. Of Webapps, ROOT, WEB-INF, classes etc ...

Here is all the information again:

My JSP File located at: D:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\jsp\Hour8

<HTML><HEAD&g t;<TITLE>Overriding toString() Method</TITLE></HEAD><BODY>
<%@ page import="OverridingToString"%>
<%! OverridingToString ots1 = new OverridingToString();
OverridingToString ots2 = new OverridingToString("New Message");
%>
<UL>
<LI>ots1 = <%=ots1%>
<LI>ots2 = <%=ots2%>
</UL>
</BODY></HEAD>

The class file is at D:\tomcat\jakarta-tomcat-3.3.1\webapps\myJSPs\WEB-INF\classes\Hour8:

package Hour8;
public class OverridingToString{
String message = "Default Message";
public OverridingToString(){}
public OverridingToString(String msg){message = msg;}
public String toString(){ return message; }
}

I start the simple web Application:

http://localhost:8080/myJSPs/jsp/Hour8/overridingToString.jsp

Error: 500
Location: /myJSPs/jsp/Hour8/overridingToString.jsp
Internal Servlet Error:

org.apache.jasper.JasperException: Unable to compile D:\tomcat\jakarta-tomcat-3.3.1\work\DEFAULT\myJSPs\jsp\Hour8\overridingToString _1.java:6: Class OverridingToString not found in import.
import OverridingToString;
^
1 error

at org.apache.tomcat.facade.JasperLiaison.javac(JspInterceptor.java:898)
at org.apache.tomcat.facade.JasperLiaison.processJspFile(JspInterceptor.java:733)
at org.apache.tomcat.facade.JspInterceptor.requestMap(JspInterceptor.java:506)
at org.apache.tomcat.core.ContextManager.processRequest(ContextManager.java:968)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:875)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:833)
at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Http10Inte rceptor.java:176)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:494)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:5 16)
at java.lang.Thread.run(Thread.java:484)

Please try to help?
Some one must be working on similar stuff with JSP???????@???>????@?< <>

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Sep 1, 2002 2:12 PM

Reply

Hey, your server.xml file is supposed to have a context entry in it such as:

<Context path="/"
docBase="webapps/myJSPs"
debug="0"
reloadable="true"
trusted="false" >
</Context>

Your server.xml file is under the conf folder.
You should read up on a Tomcat how to tutorial. There are dozens available on the web. Perhaps searching google or www.ixquick.com would get you going.

For such a basic jsp and java bean example, you could try putting your jsp files in the default ROOT directory, and the class file in the ROOT/WEB-INF/classes/Hour8 folder and skip the server.xml entry above.

I had the same troubles when I first tried to get a jsp example like yours going. Yeah, it was frustrating. The documentation did not seem to make any sense.

Sid Northfield

Posts: 20
Nickname: northfield
Registered: Aug, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Sep 1, 2002 3:33 PM

Reply

Charles Bell,

I have it working now. My book does not tell you were to put the class files (probably expects this as prior knowledge) so it is probably not very good. However I do like the topics.

>Hey, your server.xml file is supposed to have a context entry in it.
I have read about context and server.xml before. Question, when they mention the "context" is this like a path to your web files like jsp, servlets etc?

Charles Bell

Posts: 519
Nickname: charles
Registered: Feb, 2002

Re: simple JSP program, error 500 file not found problem

Posted: Sep 2, 2002 12:18 PM

Reply

Hey, congratulations on getting your jsps going!

As best as I understand it, contexts are like web applications that have a folder under the tomcat webapps folder.

The server.xml file designates where and how to treat these different contexts.

I have a context setup in my Tomcat server.xml file
as follows:
<Context path="/"
docBase="webapps/htdocs"
debug="0"
reloadable="true"
trusted="false" >
</Context>

I put my web and jsp pages in the docBase or "webapps/htdocs" folder
and my class files in the "webapps/htdocs/WEB-INF" folder

When I start my tomcat server running on my pc, I put in the following url in my web browser to see the root index html web page:
http://127.0.0.1/index.html and from there link to subfolders where my jsp files are located. Classes in the "webapps/htdocs/WEB-INF" folder are accessible from jsps.

If a have classes that are part of a package, then a folder structure that reflects the package name relative to webapps/htdocs/WEB-INF must be setup.

The java.sun web site has a Java Web Services tutorial at:
http://java.sun.com/webservices/docs/1.0/tutorial/index.html

They have a whole section on Getting Started With Tomcat at:

http://java.sun.com/webservices/docs/1.0/tutorial/doc/GettingStarted.html

There is a Marty Hall tutorial for Tomcat 4 at:
http://www.moreservlets.com/Using-Tomcat-4.html

I am no expert on all this jsp stuff, but I have managed to get a nice web application working on the internet, nothing as fancy as this site.

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