fix: groovy class loader issue (#39)

Author: sunwu51

src/main/java/w/core/ExecBundle.java

@@ -71,7 +71,6 @@ public Class<?> loadClass(String name) throws ClassNotFoundException {
             if (!name.equals(EXEC_CLASS)) {
                 return super.loadClass(name);
             }
-            FileInputStream f;
             try {
                 byte[] bytes = WCompiler.compileWholeClass("package w; public class Exec { public void exec() {} }");
                 return defineClass(EXEC_CLASS, bytes, 0, bytes.length);

src/main/java/w/core/GroovyBundle.java

@@ -116,6 +116,9 @@ public WGroovyClassLoader(ClassLoader delegate) throws Exception {
         }
         @Override
         public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+            if (name.startsWith("w.") && !name.equals(GroovyBundle.class.getName())) {
+                return delegate.loadClass(name);
+            }
             try {
                 Class<?> c = findLoadedClass(name);
                 if (c != null) return c;