Why am I getting this NoClassDefFoundError even though the dependency is on my classpath?

Question

Java code throwing the NoClassDefFoundError:

public class Main {
    public static void main(String[] args) {
        try {
            System.out.println("Starting Compiler4..");
            Compiler4.main(args);
            System.out.println("Compiler4 finished successfuly");

        } catch (Throwable ex) {

            System.out.println("Compiler4 threw an exception: " + ex);
            ex.printStackTrace();

            Throwable cause = ex.getCause();

            if (cause != null) {
                System.out.println("Cause: " + cause);
                cause.printStackTrace();                
            }

            System.out.println("End of Compiler4 exception");
        }
    }

}

Compiler4.java imports the right package name for Disposable class:

import com.intellij.openapi.Disposable;

Classpath:

$ echo $CLASSPATH
./tmp/lcc4/util.jar

Disposable is found in jar:

$ jar -tf ./tmp/lcc4/util.jar | grep Disposable.class
Picked up _JAVA_OPTIONS: -Xmx4g
com/intellij/openapi/Disposable.class

Disposable is found by java command (It's OK that it does not have a main() method):

java com/intellij/openapi/Disposable
Picked up _JAVA_OPTIONS: -Xmx4g
Error: Main method not found in class com.intellij.openapi.Disposable, please define the main method as:
   public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application

One would think it should run correctly, but it does not:

java -jar lcc4.jar 
Picked up _JAVA_OPTIONS: -Xmx4g
Starting Compiler4..
Compiler4 threw an exception: java.lang.NoClassDefFoundError: com/intellij/openapi/Disposable
java.lang.NoClassDefFoundError: com/intellij/openapi/Disposable
    at com.dreambox.Main.main(Main.java:12)
Caused by: java.lang.ClassNotFoundException: com.intellij.openapi.Disposable
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 1 more
Cause: java.lang.ClassNotFoundException: com.intellij.openapi.Disposable
java.lang.ClassNotFoundException: com.intellij.openapi.Disposable
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.dreambox.Main.main(Main.java:12)
End of Compiler4 exception

I am on Mac.

I would try adding the complete path of util.jar to the Class-Path manifest entry in your lcc4.jar. See http://docs.oracle.com/javase/6/docs/technotes/guides/jar/jar.html#Main%20Attributes for more info on this. — Jerry Oberle, Nov 15 '16 at 01:57
@JerryOberle, that worked! Now I am confused. Don't Jars use normal $CLASSPATH? — Irina Rapoport, Nov 15 '16 at 02:18
@IrinaRapoport, no, apparently they do not. See the description of the -jar option to the java program itself, in http://docs.oracle.com/javase/7/docs/technotes/tools/windows/java.html It says that "When you use this option, the JAR file is the source of all user classes, and other user class path settings are ignored." — Jerry Oberle, Nov 15 '16 at 02:31
Thank you! That was very valuable. That's the complete answer, in comments. — Irina Rapoport, Nov 15 '16 at 02:35
duplicate http://stackoverflow.com/questions/183292/classpath-including-jar-within-a-jar — Scott Sosna, Nov 15 '16 at 02:59

Why am I getting this NoClassDefFoundError even though the dependency is on my classpath?

0 Answers0