1

my problem is, that my code which was working on Java6 does not work any more. Since my app needs to load jar's at runtime (plugins), i wrote myselt a simple class deriving from URLClassLoader like this

public class MyClassLoader extends java.net.URLClassLoader {

/** Creates a new instance of URLClassLoader */
public MyClassLoader(java.net.URL url) 
{
    super(new java.net.URL[]{url},ClassLoader.getSystemClassLoader());
}

public void addURL(java.net.URL url)
{
    super.addURL(url);
}}

So if i want load a jar, i simply call addURL(pathToJar) and load that class via 

Class.forName(myClass, true, myClassLoader)

This worked like a charm running on Java6. Now i decided to make a self contained java app in Java7. When I start the app, the jar's also get loaded at runtime, but if there's a class inside which derives from a class that is inside the classpath (not in the plugin jar) i get a ClassCastException.

So i guess something has changed in Java7. At the moment I'm using Java7_u13 on OSX. Can any one give me a hint on what I should do, to get the old behaviour back? Searching the net didn't get me any help yet.

Many thanks in advance.

Greetings, -chris-

Chris
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1 Answers1

3

Meanwhile i found the solution to my problem. I just used the 'wrong' classloader as the parent. Everything now works fine if i replace

super(new java.net.URL[]{url},ClassLoader.getSystemClassLoader());

with

super(new java.net.URL[]{url},MyClassLoader.class.getClassLoader());

Greetings, -chris-

Chris
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  • 4
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