0 Replies Latest reply: Dec 8, 2011 12:04 PM by Eirc Zhao RSS

    Help for java.lang.VerifyError when modify a method

    Eirc Zhao Newbie

      Hi,all,

           I write a class named Bsafproxy which will change the method  of the org.jdesktop.application.ResourceMap in the basf-1.9.jar; I don't know why it can not work, who will do me a faver, give me some idears, thanks.

       

           BTW, BsafProxy.java is my class, and the bsaf-1.9.jar is witch i wanna to modifed.

       

       

      package org.eric.javassist;
      
      import javassist.CannotCompileException;
      import javassist.ClassPool;
      import javassist.CtClass;
      import javassist.CtMethod;
      import javassist.CtNewMethod;
      import javassist.Loader;
      import javassist.NotFoundException;
      
      /**
       * @author apple
       *
       */
      public class BsafProxy {
      
        /**
                 * @param args
                 */
                public static void main(String[] args) {
                          try {
                                    ClassPool csPool = ClassPool.getDefault();
                                    csPool.insertClassPath("/Users/apple/Documents/Eric/work/eclipse/workspace/HelloMac/bsaf-1.9.jar");
                                    CtClass demoClass = csPool.get("org.jdesktop.application.ResourceMap");
        
                                    CtMethod populateResourceMap = demoClass.getDeclaredMethod("populateResourceMap");
                                    demoClass.removeMethod(populateResourceMap);
        
                                    CtMethod newPopulate = CtNewMethod.make(getContent(), demoClass);
                                    demoClass.addMethod(newPopulate);
        
      //                              URL clazz = csPool.find("org.jdesktop.application.ResourceMap");
                                    Loader loader = new Loader(csPool);
        Class clazz = loader.loadClass("org.jdesktop.application.ResourceMap");
                                    clazz.newInstance();
                          } catch (NotFoundException e) {
        // TODO Auto-generated catch block
                                    e.printStackTrace();
                          } catch (CannotCompileException e) {
        // TODO Auto-generated catch block
                                    e.printStackTrace();
                          } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
                                    e.printStackTrace();
                          } catch (InstantiationException e) {
        // TODO Auto-generated catch block
                                    e.printStackTrace();
                          } catch (IllegalAccessException e) {
        // TODO Auto-generated catch block
                                    e.printStackTrace();
                          }
                }
        
                private static String getContent() {
      //                    private void populateResourceMap(String bundleName, Map<String, Object> bundlesMap) {
      //                  try {
      //                      ResourceBundle bundle = ResourceBundle.getBundle(bundleName, locale, classLoader);
      //                      Enumeration<String> keys = bundle.getKeys();
      //                      while (keys.hasMoreElements()) {
      //                          String key = keys.nextElement();
      //                          bundlesMap.put(key, bundle.getObject(key));
      //                      }
      //                  } catch (MissingResourceException ignore) {
      //                      /* bundleName is just a location to check, it's not
      //                       * guaranteed to name a ResourceBundle
      //                       */
      //                  }
      //              }
                          StringBuffer content = new StringBuffer();
                          content.append("private void populateResourceMap(String bundleName, java.util.Map bundlesMap) {");
                          content.append("try {");
                          content.append("          java.util.ResourceBundle bundle = java.util.ResourceBundle.getBundle($1, locale, classLoader);");
                          content.append("          java.util.Enumeration keys = bundle.getKeys();");
                          content.append("          while (keys.hasMoreElements()) {");
                          content.append("                    String key = keys.nextElement();");
                          content.append("                    $2.put(key, bundle.getObject(key));");
                          content.append("          }");
                          content.append("} catch (java.util.MissingResourceException ignore) { }");
                          content.append("}");
                          return content.toString();
                }
      
      }
      
      ouput:
      
      Exception in thread "main" java.lang.VerifyError: (class: org/jdesktop/application/ResourceMap, method: populateResourceMap signature: (Ljava/lang/String;Ljava/util/Map;)V) Incompatible argument to function
                at java.lang.Class.getDeclaredConstructors0(Native Method)
                at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
                at java.lang.Class.getConstructor0(Class.java:2699)
                at java.lang.Class.newInstance0(Class.java:326)
                at java.lang.Class.newInstance(Class.java:308)
                at org.eric.javassist.BsafProxy.main(BsafProxy.java:38)