Can we set classpath dynamically

Question

Is it possible to set Classpath from java code .. Before executing a Java class we can set classpath manually using set classpath option in windows .. But here i want to do that from java code .. not thru this dos command.. is there any java API's to do this ??

Answer 1

Hey its possible ..
File afile = new File (MyJarName);
URL rl = new URL (afile.toURL().toString());
URL [] ury = new URL [] {rl};
URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
Class sysclass = URLClassLoader.class;
Method method = sysclass.getDeclaredMethod("addURL", new Class[]{rl.getClass()});
method.setAccessible(true);
method.invoke(sysloader, new Object[] {rl});
String Classpath = System.getProperty("java.class.path");
System.out.println("Before->"+Classpath);
Classpath = Classpath + System.getProperty("path.separator") + rl.toString();
System.setProperty("java.class.path", Classpath);
Classpath = System.getProperty("java.class.path");
System.out.println("After->"+Classpath);