Pfthb

I currently try to run java code in Maxmsp using a mxj object, and I want to load some classes inside of the code.
But I always get the errors, although the code runs properly in eclipse.

What is the problem?

This is my code.
If I bang in Maxmsp, call() will be called.

package Load;

import com.cycling74.max.*;

public class Loaded extends MaxObject
 public static void main(String args) 
 //This works properly in eclipse
 call();
 

 public void bang() 
 //This should work in Maxmsp, but get errors
 call();
 

 public static void call() 
 try 
 //this is just a example
 //I want to load some classes which locate the same directory as this class
 Thread.currentThread().getContextClassLoader().loadClass("Load.Loaded");
 catch (ClassNotFoundException e) 
 e.printStackTrace();
 
 

And this is the error message:

java.lang.ClassNotFoundException: Load.Loaded
 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 Load.Loaded.call(Loaded.java:21)
 at Load.Loaded.bang(Loaded.java:16)

MXJ System class path is:

/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/commons-codec-1.11.jar:
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/core.jar:
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/gluegen-rt-natives-macosx-universal.jar:
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/gluegen-rt.jar:
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/jitter.jar:
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/jode-1.1.2-pre-embedded.jar: 
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/jogl-all-natives-macosx-universal.jar: 
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/jogl-all.jar: 
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/max.jar: 
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/lib/sadamLib.jar

MXJ Classloader CLASSPATH is:

/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/classes/
/Applications/Max.app/Contents/Resources/C74/packages/max-mxj/java-classes/
/Users/MyName/Documents/ecllipse-workspace/009_Processing/bin

Loaded.class is in /Users/MyName/Documents/ecllipse-workspace/009_Processing/bin

You need to include any of your dependencies on the classpath:

java -cp "path/to/maxmsp.jar;path/to/dependency2.jar;path/to/your.jar" classpath.of.your.Main

If you are just running directly from a classfile and haven't JARred your project then you can omit the path/to/your.jar and just run from the same directory with the classpath of your Main.

The above is for running java from command line.

Since Max is what is running and what's taking control of the classloading im guessing that sun.misc.Launcher$AppClassLoader is not working. Try debugging and see what it's doing. Also maybe try to find a way to use the Max classloader instead of the Java AppClassLoader.

The problem was what Max cannot load class properly.
So I created class loader method.

public static ClassLoader createClassLoader(String dirname) throws java.io.IOException 
 java.net.URL url = new java.net.URL[1];
 java.io.File file;
 if (dirname.endsWith("/")) 
 file = new java.io.File(dirname);
 
 else 
 file = new java.io.File(dirname + "/");
 
 url[0]= file.toURI().toURL();

 ClassLoader parent = ClassLoader.getSystemClassLoader();
 java.net.URLClassLoader loader = new java.net.URLClassLoader(url, parent);
 return loader

And call

ClassLoader loader = createClassLoader("ClassPath");
Class<?> c = Class.forName("Classname", true, loader);