Examples of javassist.ClassPool

javassist.ClassPool
A container of CtClass objects. A CtClass object must be obtained from this object. If get() is called on this object, it searches various sources represented by ClassPath to find a class file and then it creates a CtClass object representing that class file. The created object is returned to the caller.
Memory consumption memo:
ClassPool objects hold all the CtClasses that have been created so that the consistency among modified classes can be guaranteed. Thus if a large number of CtClasses are processed, the ClassPool will consume a huge amount of memory. To avoid this, a ClassPool object should be recreated, for example, every hundred classes processed. Note that getDefault() is a singleton factory. Otherwise, detach() in CtClass should be used to avoid huge memory consumption.
ClassPool hierarchy:
ClassPools can make a parent-child hierarchy as java.lang.ClassLoaders. If a ClassPool has a parent pool, get() first asks the parent pool to find a class file. Only if the parent could not find the class file, get() searches the ClassPaths of the child ClassPool. This search order is reversed if ClassPath.childFirstLookup is true. @see javassist.CtClass @see javassist.ClassPath

   * @param clazz
   * @param b
   * @return
   */
  private byte[] doClass(String name, Class<?> clazz, byte[] b) {
    ClassPool pool = ClassPool.getDefault();
    CtClass cl = null;
    try {
      cl = pool.makeClass(new ByteArrayInputStream(b));
      if (cl.isInterface() == false) {


        loggerName = "_____log";


        // We have to declare the log variable.

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    {
        try
        {
            final String className = existingClass.getName();


            final ClassPool pool = ClassPool.getDefault();
            final ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
            if (contextClassLoader != null)
            {
                pool.insertClassPath(new LoaderClassPath(contextClassLoader));
            }
            final CtClass ctClass = pool.get(className);
            
            // - make sure the class isn't frozen
            ctClass.defrost();


            final String scriptWrapperFieldName = "scriptWrapper";
            try
            {
                ctClass.getField(scriptWrapperFieldName);
            }
            catch (Exception exception)
            {
                final CtField scriptWrapper =
                    new CtField(
                        convert(
                            pool,
                            this.scriptWrapperName),
                        scriptWrapperFieldName,
                        ctClass);
                scriptWrapper.setModifiers(Modifier.PRIVATE + Modifier.FINAL);
                ctClass.addField(
                    scriptWrapper,
                    getScriptWrapperInitialization(
                        scriptDirectory,
                        className));
            }


            final CtMethod[] existingMethods = ctClass.getDeclaredMethods();
            for (int ctr = 0; ctr < existingMethods.length; ctr++)
            {
                final CtMethod method = existingMethods[ctr];
                if (!Modifier.isStatic(method.getModifiers()))
                {
                    final CtClass returnType = method.getReturnType();
                    String methodBody;
                    if (returnType.equals(CtClass.voidType))
                    {
                        methodBody =
                            "{" + contructArgumentString(method) + "scriptWrapper.invoke(\"" + method.getName() +
                            "\", arguments);}";
                    }
                    else
                    {
                        if (returnType.isPrimitive())
                        {
                            methodBody =
                                "{" + contructArgumentString(method) + " return ((" + getWrapperTypeName(returnType) +
                                ")scriptWrapper.invoke(\"" + method.getName() + "\", arguments))." +
                                returnType.getName() + "Value();}";
                        }
                        else
                        {
                            methodBody =
                                "{" + contructArgumentString(method) + " return (" + method.getReturnType().getName() +
                                ")scriptWrapper.invoke(\"" + method.getName() + "\", arguments);}";
                        }
                    }
                    method.setBody(methodBody);
                }
            }


            final File directory = getClassOutputDirectory(existingClass);


            pool.writeFile(className,
                directory != null ? directory.getAbsolutePath() : "");
        }
        catch (final Throwable throwable)
        {
            throwable.printStackTrace();

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    protected int seqId = 0;


    public JavassistTemplateBuilder(TemplateRegistry registry) {
  super(registry);
  pool = new ClassPool();
  boolean appended = false;
  ClassLoader cl = null;
  try {
      cl = Thread.currentThread().getContextClassLoader();
      if (cl != null) {

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      String deployADir = "/scopedA.ear/scopedA.jar";
      File libDir = new File(jbosstestDeployDir, deployADir);
      System.out.println("libDir = " + libDir.getAbsolutePath());
      // Create a SimpleResponseDTO class with a static serialVersionUID of 1L
      //ClassPool defaultPool = ClassPool.getDefault();
      ClassPool classes1Pool = ClassPool.getDefault();
      //ClassPool classes1Pool = new ClassPool(defaultPool);
      CtClass info = classes1Pool.makeClass("org.jboss.test.scoped.interfaces.dto.SimpleResponseDTO");
      info.addInterface(classes1Pool.get("java.io.Serializable"));
      CtClass s = classes1Pool.get("java.lang.String");
      CtField firstName = new CtField(s, "firstName", info);
      firstName.setModifiers(Modifier.PRIVATE);
      info.addField(firstName);
      CtMethod getFirstName = CtNewMethod.getter("getFirstName", firstName);
      getFirstName.setModifiers(Modifier.PUBLIC);
      info.addMethod(getFirstName);
      CtMethod setFirstName = CtNewMethod.setter("setFirstName", firstName);
      setFirstName.setModifiers(Modifier.PUBLIC);
      info.addMethod(setFirstName);
      CtClass s2 = classes1Pool.get("java.lang.String");
      CtField lastName = new CtField(s2, "lastName", info);
      lastName.setModifiers(Modifier.PRIVATE);
      info.addField(lastName);
      CtMethod getLastName = CtNewMethod.getter("getLastName", lastName);
      getLastName.setModifiers(Modifier.PUBLIC);

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      String deployBDir = "/scopedB.ear/scopedB.jar";
      File libDir = new File(jbosstestDeployDir, deployBDir);
      System.out.println("libDir = " + libDir.getAbsolutePath());
      // Create a SimpleResponseDTO class with a static serialVersionUID of 1L
      //ClassPool defaultPool = ClassPool.getDefault();
      ClassPool classes1Pool = ClassPool.getDefault();
      //ClassPool classes1Pool = new ClassPool(defaultPool);
      CtClass info = classes1Pool.makeClass("org.jboss.test.scoped.interfaces.dto.SimpleResponseDTO");
      info.addInterface(classes1Pool.get("java.io.Serializable"));
      CtClass s = classes1Pool.get("java.lang.String");
      CtField firstName = new CtField(s, "firstName", info);
      firstName.setModifiers(Modifier.PRIVATE);
      info.addField(firstName);
      CtMethod getFirstName = CtNewMethod.getter("getFirstName", firstName);
      getFirstName.setModifiers(Modifier.PUBLIC);
      info.addMethod(getFirstName);
      CtMethod setFirstName = CtNewMethod.setter("setFirstName", firstName);
      setFirstName.setModifiers(Modifier.PUBLIC);
      info.addMethod(setFirstName);
      CtClass s2 = classes1Pool.get("java.lang.String");
      CtField lastName = new CtField(s2, "lastName", info);
      lastName.setModifiers(Modifier.PRIVATE);
      info.addField(lastName);
      CtMethod getLastName = CtNewMethod.getter("getLastName", lastName);
      getLastName.setModifiers(Modifier.PUBLIC);

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        RunTest nullJavassistAdapt = new RunTest() {
            ClassPool pool;
            @Override
            public void init() {
                pool = new ClassPool(null);                
            }
            @Override
            public void test(byte[] bytes, int[] errors) throws Exception {
                nullJavassistAdapt(pool, bytes);
            }

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        registry.shutdown();
    }


    private void createImplementationClass(String status) throws Exception
    {
        ClassPool pool = new ClassPool(null);


        pool.appendSystemPath();


        CtClass ctClass = pool.makeClass(CLASS);


        ctClass.addInterface(pool.get(ReloadableService.class.getName()));


        CtMethod method = new CtMethod(pool.get("java.lang.String"), "getStatus", null, ctClass);


        method.setBody(String.format("return \"%s\";", status));


        ctClass.addMethod(method);

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        ctClass.writeFile(classesDir.getAbsolutePath());
    }


    private void createInvalidImplentationClass() throws Exception
    {
        ClassPool pool = new ClassPool(null);


        pool.appendSystemPath();


        CtClass ctClass = pool.makeClass(CLASS);


        ctClass.addInterface(pool.get(ReloadableService.class.getName()));


        CtMethod method = new CtMethod(pool.get("java.lang.String"), "getStatus", null, ctClass);


        method.setBody("return \"unreachable\";");


        ctClass.addMethod(method);

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            logger.info("Getting method info: {}", fullName);


            // Make a new classpool with the system classpath URLS
            // We create a new classpool each time since we want to reload plugin information in case it has changed.
            // Once a method is loaded this should not get called so the extra expense is not always taken as a hit
            ClassPool classPool = new ClassPool();
            ClassLoader sysClassLoader = Thread.currentThread().getContextClassLoader();


            //Get the URLs
            URL[] urls = ((URLClassLoader) sysClassLoader).getURLs();
            for (int i = 0; i < urls.length; i++) {
                try {
                    // insert all classpaths into the javassist classpool
                    classPool.insertClassPath(urls[i].getFile());
                } catch (NotFoundException e) {
                    e.printStackTrace();
                }
            }
            classPool.insertClassPath(classInfo.pluginPath);


            // load method information
            Method[] methods = gottenClass.getDeclaredMethods();
            for (Method method : methods) {
                if (method.getName().compareTo(methodName) != 0)

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        }
    }


    private Class<?> createArtificialApplicationResourcesClass() {
        try {
            ClassPool classPool = ClassPool.getDefault();
            CtClass applicationResourcesCtClass = classPool.makeClass(APP_FUSE_RESOURCE_FILE_NAME);
            return applicationResourcesCtClass.toClass();
        } catch (CannotCompileException e) {
            throw new RuntimeException("Unable to instantiate Wicket application", e);
        }
    }

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