determining jar file in use.

[kanghao]

How can I determine which jar file I use for a certain class.

For example, org.w3c.dom.Element is available from so many jar files xalan, apache, jdom etc.

I want to know which *.jar file is in used. thanks.

 

[stefanwagner]

perhaps

protected URL ClassLoader.findResource (String name)

?

(didn't try it myself)

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[kanghao]

Almost!
JWhich works.

public class JWhich {

public static void main(String[] args) {
if(args.length > 0) {
JWhich.whichByClass(args[0]);
} else {
System.err.println("Usage: java JWhich <classname>");
}
}
public static void whichByClass(String className) {
if(!className.startsWith("/")) {
className = "/" + className;
}
className = className.replace('.', '/');
className = className + ".class";
java.net.URL classUrl = new JWhich().getClass().getResource(className);
if(classUrl != null) {
System.out.println("\nClass '" + className + "' found in \n'" + classUrl.getFile() + "'");
} else {
System.out.println("\nClass '" + className + "' not found in \n'" + System.getProperty("java.class.path") + "'");
}
}

public static String whichByObject(Object objName){
Class c = objName.getClass();
ClassLoader cl = Thread.currentThread().getContextClassLoader();
String cn = c.getName().replaceAll("\\.","/") + ".class";
String path = cl.getResource(cn).getFile();
return path;
}

}