1    package serialPorts; 
2     
3    import sun.misc.ClassFileTransformer; 
4    import sun.misc.CompoundEnumeration; 
5    import sun.misc.Resource; 
6    import sun.misc.URLClassPath; 
7    import sun.reflect.Reflection; 
8     
9    import java.io.File; 
10   import java.io.IOException; 
11   import java.io.InputStream; 
12   import java.lang.reflect.Constructor; 
13   import java.lang.reflect.InvocationTargetException; 
14   import java.net.URL; 
15   import java.security.*; 
16   import java.util.*; 
17    
18    
19   class SystemClassLoaderAction implements PrivilegedExceptionAction { 
20       private ClassLoader parent; 
21    
22       SystemClassLoaderAction(ClassLoader parent) { 
23           this.parent = parent; 
24       } 
25    
26       public Object run() throws Exception { 
27           ClassLoader sys; 
28           Constructor ctor; 
29           Class c; 
30           Class cp[] = {ClassLoader.class}; 
31           Object params[] = {parent}; 
32    
33           String cls = System.getProperty("java.system.class.loader"); 
34           if (cls == null) { 
35               return parent; 
36           } 
37    
38           c = Class.forName(cls, true, parent); 
39           ctor = c.getDeclaredConstructor(cp); 
40           sys = (ClassLoader) ctor.newInstance(params); 
41           Thread.currentThread().setContextClassLoader(sys); 
42           return sys; 
43       } 
44    
45   } 
46    
47