I have a class method that works under a container class,
but Tomcat returns NoClassDefFound on the imported class method when it's
called from a servlet (which is nearly identical to the container class)
inside Tomcat. I searched the archive before subscribing here, but
couldn't find any questions on this since Dec 1.
Sorry if this message is lengthy but here goes...
I have a public class (thelper.java) with class method ssiServe.
This method reads a file, replaces keys with new values and outputs the
contents to System.err. I have a test.java that calls the
thelper.ssiserve() class method and it works well.
I now call thelper from a simple servlet (getimage.java), derived
from test.java, changing the thelper class's output object from
System.err to a the servlet's PrintWriter object.
When I run it from my browser, I get a two stack traces
(with http error 500, reported by Tomcat).
The first line of the first (labeled "exception") is:
javax.servlet.ServletException: Servlet execution threw an exception
The first line of the second (labeled "root cause") is:
java.lang.NoClassDefFoundError: classes/thelper
So it would seem to me that the thelper class cannot be "seen" by
tomcat, though it is seen in the JVM otherwise. I've tried
everything I know how, though I'm very new to Java and JSP. I can
incorporate this class method into the calling class and solve the
problem, but I wrote it this way because the method will be used by
quite a few different servlets (>10), and I need it to be centralized
for obvious reasons.
My J2SE is installed in c:\javakit and my J2EE is in c:\javaee.
classpath =
c:\;d:\;c:\javakit\src.jar;c:\javakit\lib\tools.jar;
c:\javaee\lib\j2ee.jar;c:\progra~1\tomcat4\webapps\sqaa\WEB-INF;
java_home =
c:\javakit
Tomcat 4.0.1 is installed in c:\progra~1\tomcat4.
Java -version:
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)
This obviously seems like a problem with my classpath or with pack names and
class locations, but it makes no sense to me that it would work outside of
Tomcat. I deduce that it's a problem with my tomcat configuration (it
doesn't know to look for it) or there's some cardinal rule that I've
overlooked. Any other ideas? I've been up and down the tomcat and apache
docs, finding exactly the same information on configuration everywhere on
the web and in a few books I have (and in the config file comments!).
They're all the same, and my standalone servlets work, so I'm pretty sure I
have those instructions down alright.
Below are my sources and their locations. If you see any mistakes, bear in
mind that I've moved these things from heck to breakfast, always with the
same result no matter what package, path or name I give this import. It's
been in $tomcat_home\webapps\sqaa..classes\,
$tomcat_home\webapps\sqaa\WEB-INF\libs\, c:\, c:\include, etc. Always the
same error, with the NoClassDefFoundError reporting the current class I'm
trying to import.
(Irrelevant code omitted:)
-----------------------------------------------
c:\progra~1\tomcat4\webapps\sqaa\web-inf\classes\test.java:
-----------------------------------------------
//package classes /* I've tried w/ and w/o package spec,
though examples don't use one.
This class works either way. */
import java.io.*;
import java.util.*;
import classes.*;
public class test {
public test(){
}
public static void main(String args[]) {
Vector ssi = new Vector();
ssi.add("<!--SSI:FILENAME-->=c:/sample.tif");
thelper.ssiServe("c:/html/test.html",ssi);
}
}
-----------------------------------------------
c:\progra~1\tomcat4\webapps\sqaa\web-inf\classes\getimage.java:
-----------------------------------------------
//package classes /* I've tried w and w/o package spec,
though all examples don't use one. */
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import classes.*;
public class getimage extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse
response)
throws IOException, ServletException
{
PrintWriter out = response.getWriter();
Vector ssi = new Vector();
ssi.add("<!--SSI:FILENAME-->=c:/sample.tif");
thelper.ssiServe(out,"c:/html/test.html",ssi);
}
}
-----------------------------------------------
c:\progra~1\tomcat4\webapps\sqaa\web-inf\classes\thelper.java:
-----------------------------------------------
package classes;
import java.io.*;
import java.util.*;
public class thelper {
public thelper() {
}
/* When being called by getimage.java, I use this: */
public static void ssiServe(PrintWriter aout, String fname, Vector SSI)
{
}
/* When being called by test.java, I use this: */
public static void ssiServe(/*PrintWriter aout,*/ String fname, Vector
SSI) {
}
}
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