public static <T> T callWithJarClassLoader(File jarFile, Callable<T> action) throws Exception {
Thread currentThread = Thread.currentThread();
ClassLoader contextClassLoader = currentThread.getContextClassLoader();
try {
currentThread.setContextClassLoader(createJarClassLoader(jarFile));
return action.call();
} finally {
currentThread.setContextClassLoader(contextClassLoader);
}
}
public static void runWithJarClassLoader(File jarFile, Runnable action)
throws MalformedURLException {
Thread currentThread = Thread.currentThread();
ClassLoader contextClassLoader = currentThread.getContextClassLoader();
try {
currentThread.setContextClassLoader(createJarClassLoader(jarFile));
action.run();
} finally {
currentThread.setContextClassLoader(contextClassLoader);
}
}
/** Utility routine for setting the context class loader. Returns previous class loader. */
public static ClassLoader setContextClassLoader(ClassLoader newClassLoader) {
// Can only reference final local variables from dopriveleged block
final ClassLoader classLoaderToSet = newClassLoader;
final Thread currentThread = Thread.currentThread();
ClassLoader originalClassLoader = currentThread.getContextClassLoader();
if (classLoaderToSet != originalClassLoader) {
if (System.getSecurityManager() == null) {
currentThread.setContextClassLoader(classLoaderToSet);
} else {
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public java.lang.Object run() {
currentThread.setContextClassLoader(classLoaderToSet);
return null;
}
});
}
}
return originalClassLoader;
}