Determine location of a java class loaded by Matlab

Question

When using java from Matlab, is there some way to figure out from where in matlab\'s java class path is a class being loaded? I\'m trying to diagnose a error caused by confl

Answer 1

From http://www.exampledepot.com/egs/java.lang/ClassOrigin.html

// Get the location of this class
  Class cls = this.getClass();
 ProtectionDomain pDomain = cls.getProtectionDomain();
  CodeSource cSource = pDomain.getCodeSource();
  URL loc = cSource.getLocation();  // file:/c:/almanac14/examples/

Answer 2

Per Thorbjørn Ravn Andersen, if j reference to a java object in Matlab, its location can be retrieved with the following line of matlab code:

j.getClass().getProtectionDomain().getCodeSource().getLocation().getPath()

Answer 3

Use the inmem function as follows:

[M,X,J] = inmem

This function returns the list of Java classes in the output argument J. (It also returns the names of all currently loaded M-files in M, and the names of all currently loaded MEX-files in X.)

Here's a sample of output from the inmem function:

[m,x,j] = inmem;

MATLAB displays:

j = 
    'java.util.Date'
    'com.mathworks.ide.desktop.MLDesktop'

Answer 4

Since 1.5 using:

java -verbose:class 

Prints where each class was loaded from.

Answer 5

Assuming that an URLClassLoader is being used, you can get the file: URL of the class file like this:

ProblemClass.class.getResource("ProblemClass.class")