Runtime classpath issue -- NoClassDefFoundError
Hi,
It shames me to post such a common, everyday problem, but I cannot figure this one out.
I have a class in the package service: service.SynchImage. I have a class in another package as well: vigra.matlab.LOTFClient. In LOTFClient, I am importing service.SynchImage and trying to instantiate it.
All my source code compiles successfully.
When I try to run my program, I get a NoClassDefFoundError telling me it cannot find service/SynchImage.
This is how I am trying to use service.SynchImage (from LOTFClient):
package vigra.matlab;
import service.SynchImage;
publicfinalclass LOTFClientimplements Runnable{
privatestaticbyte[] in;
publicvoid run(){
try{
if (imAq ==null){//imAq is not relevant
thrownew Exception("Proxy to LOTFVigra is invalid");
}else{
System.out.println("Connection to LOTFVigra service successful");
in = imAq.acquireImage();
SynchImage si =new SynchImage(in, 640, 480);
}
}catch (Exception e){
System.err.println(e.getMessage());
}
}
}
Again, this DOES compile successfully. Here is how I am running this class:
package vigra.matlab;
publicclass LOTFDriver{
publicstaticvoid main(String[] args){
LOTFClient client =new LOTFClient();
Thread thread =new Thread(client);
thread.start();
}
}
Alrighty. I'm using an Ant build script to compile all this. In my build script, I set the classpath to the appropriate directories, as follows:
<!-- Define the Java classpath -->
<path id="classpath">
<pathelement location="${CATALINA_HOME}/webapps/kdb/WEB-INF/classes" />
<pathelement location="/u/dgresh/Ice-3.1.0/lib/Ice.jar" />
</path>
<!-- Compile the Java code -->
<target name="compile" depends="init">
<javac srcdir="${src}" destdir="${build}">
<classpath refid="classpath" />
</javac>
</target>
When I browse to $CATALINA_HOME/webapps/kdb/WEB-INF/classes I see the "service" package there. When I browse inside the package, I see "SynchImage.class" there. I found a duplicate "service" package that did not contain the SynchImage.class file and deleted it, but I still get the error.
Is there anything else I should be checking for? What on earth am I missing? It must be something incredibly obvious, but what is it?
Oh, here is SynchImage, if it matters:
package service;
import java.awt.image.BufferedImage;
publicclass SynchImage{
privatestaticbyte[] input;
privatestaticint width;
privatestaticint height;
public SynchImage(byte[] input,int width,int height){
this.input = input;
this.width = width;
this.height = height;
ImageProcessor.createAndSaveImage(input, width, height);
}
publicstatic BufferedImage fetchImage(){
return ImageProcessor.createImage(input, width, height);
}
}
Thanks
