Fix: NPE

Author: c0d3p1ut0s

src/main/java/com/c0d3p1ut0s/StackTraceTransformer.java

@@ -40,26 +40,27 @@ public ClassAdapter(final ClassVisitor cv, String className) {
     public MethodVisitor visitMethod(final int access, final String name,
                                      final String desc, final String signature, final String[] exceptions) {
         MethodVisitor mv = cv.visitMethod(access, name, desc, signature, exceptions);
+        if (clazzName != null) {
+            final String methodName = clazzName.replace('/', '.') + "." + name;
+            for (String methodPrefix : StackTraceHelper.methodPrefix) {
+                if (methodName.startsWith(methodPrefix)) {
+                    MethodVisitor nmv = new AdviceAdapter(Opcodes.ASM5, mv, access, name, desc) {
+                        @Override
+                        protected void onMethodEnter() {
+                            mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
+                            mv.visitLdcInsn("Enter Method: " + methodName);
+                            mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
 
-        final String methodName = clazzName.replace('/', '.') + "." + name;
-        for (String methodPrefix : StackTraceHelper.methodPrefix) {
-            if (methodName.startsWith(methodPrefix)) {
-                MethodVisitor nmv = new AdviceAdapter(Opcodes.ASM5, mv, access, name, desc) {
-                    @Override
-                    protected void onMethodEnter() {
-                        mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
-                        mv.visitLdcInsn("Enter Method: " + methodName);
-                        mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
-
-                        mv.visitTypeInsn(NEW, "java/lang/Exception");
-                        mv.visitInsn(DUP);
-                        mv.visitLdcInsn("Java Stack Trace");
-                        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Exception", "<init>", "(Ljava/lang/String;)V", false);
-                        mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
-                        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "(Ljava/io/PrintStream;)V", false);
-                    }
-                };
-                return nmv;
+                            mv.visitTypeInsn(NEW, "java/lang/Exception");
+                            mv.visitInsn(DUP);
+                            mv.visitLdcInsn("Java Stack Trace");
+                            mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Exception", "<init>", "(Ljava/lang/String;)V", false);
+                            mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
+                            mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "(Ljava/io/PrintStream;)V", false);
+                        }
+                    };
+                    return nmv;
+                }
             }
         }
         return mv;