Java 能够加载类，但反射未显示该类

我可以毫无问题地加载类，但是当我试图使用反射查看加载的类时，它不会列出

我正在尝试做以下事情：

//using java assist renaming and saving
    ClassPool pool = ClassPool.getDefault();
    CtClass cc = pool.getAndRename("com.sample.class1",
    "com.sample.class2");
cc.writeFile("/tmp/class/");

    ClassLoader parentClassLoader = SampleClassLoader.class.getClassLoader();
    SampleClassLoader loader = new SampleClassLoader(parentClassLoader);
    //loading the new class
    Class cls = loader.loadClass("com.sample.class2");


    //use reflection to check out if the class is present
    Reflections reflections = new Reflections("com.sample", new SubTypesScanner(false),loader);

    Set<String> set = reflections.getAllTypes();
    set.forEach(x -> {
        System.out.println(x);
    });

public static Set<Class<?>> fetchAnnotatedClasses(final String packageName,
        final Class<? extends Annotation> annotation) {

    final Class[] parameters = new Class[] { URL.class };
    URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    Class sysclass = URLClassLoader.class;

    try {

        File f = new File("/tmp/class");//can make this configurable
        Method method = sysclass.getDeclaredMethod("addURL", parameters);
        method.setAccessible(true);
        method.invoke(sysloader, new Object[] { f.toURL() });
    } catch (Throwable t) {
        t.printStackTrace();


    }

    Field f = null;
    try {
        f = ClassLoader.class.getDeclaredField("classes");
    } catch (NoSuchFieldException | SecurityException e1) {

        e1.printStackTrace();
    }
    f.setAccessible(true);

    ClassLoader clLoader = Thread.currentThread().getContextClassLoader();
    Reflections reflections = null;
    try {
        reflections = new Reflections(packageName, new URL("file:/tmp/class"), clLoader);
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Set<Class<?>> clazz = reflections.getTypesAnnotatedWith(annotation);
    return clazz;

}

//使用java辅助重命名和保存
ClassPool=ClassPool.getDefault（）；
CtClass cc=pool.getAndRename（“com.sample.class1”，
“com.sample.class2”）；
cc.writeFile（“/tmp/class/”）；
ClassLoader parentClassLoader=SampleClassLoader.class.getClassLoader（）；
SampleClassLoader=新的SampleClassLoader（parentClassLoader）；
//加载新类
Class cls=loader.loadClass（“com.sample.class2”）；
//使用反射检查类是否存在
反射反射=新反射（“com.sample”，新的子扫描程序（false），加载程序）；
Set=reflections.getAllTypes（）；
set.forEach（x->{
系统输出println（x）；
});

---

`

通过添加保存类文件的反射对象的路径，解决了此问题。
我们还可以使用现有的URLClass加载器，而不是编写自己的类加载器，如下所示：

//using java assist renaming and saving
    ClassPool pool = ClassPool.getDefault();
    CtClass cc = pool.getAndRename("com.sample.class1",
    "com.sample.class2");
cc.writeFile("/tmp/class/");

    ClassLoader parentClassLoader = SampleClassLoader.class.getClassLoader();
    SampleClassLoader loader = new SampleClassLoader(parentClassLoader);
    //loading the new class
    Class cls = loader.loadClass("com.sample.class2");


    //use reflection to check out if the class is present
    Reflections reflections = new Reflections("com.sample", new SubTypesScanner(false),loader);

    Set<String> set = reflections.getAllTypes();
    set.forEach(x -> {
        System.out.println(x);
    });

public static Set<Class<?>> fetchAnnotatedClasses(final String packageName,
        final Class<? extends Annotation> annotation) {

    final Class[] parameters = new Class[] { URL.class };
    URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    Class sysclass = URLClassLoader.class;

    try {

        File f = new File("/tmp/class");//can make this configurable
        Method method = sysclass.getDeclaredMethod("addURL", parameters);
        method.setAccessible(true);
        method.invoke(sysloader, new Object[] { f.toURL() });
    } catch (Throwable t) {
        t.printStackTrace();


    }

    Field f = null;
    try {
        f = ClassLoader.class.getDeclaredField("classes");
    } catch (NoSuchFieldException | SecurityException e1) {

        e1.printStackTrace();
    }
    f.setAccessible(true);

    ClassLoader clLoader = Thread.currentThread().getContextClassLoader();
    Reflections reflections = null;
    try {
        reflections = new Reflections(packageName, new URL("file:/tmp/class"), clLoader);
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Set<Class<?>> clazz = reflections.getTypesAnnotatedWith(annotation);
    return clazz;

}

publicstaticset>clazz=reflections.getTypesAnnotatedWith（annotation）；
回击声；
}

通过添加保存类文件的反射对象的路径，解决了此问题。
我们还可以使用现有的URLClass加载器，而不是编写自己的类加载器，如下所示：

//using java assist renaming and saving
    ClassPool pool = ClassPool.getDefault();
    CtClass cc = pool.getAndRename("com.sample.class1",
    "com.sample.class2");
cc.writeFile("/tmp/class/");

    ClassLoader parentClassLoader = SampleClassLoader.class.getClassLoader();
    SampleClassLoader loader = new SampleClassLoader(parentClassLoader);
    //loading the new class
    Class cls = loader.loadClass("com.sample.class2");


    //use reflection to check out if the class is present
    Reflections reflections = new Reflections("com.sample", new SubTypesScanner(false),loader);

    Set<String> set = reflections.getAllTypes();
    set.forEach(x -> {
        System.out.println(x);
    });

public static Set<Class<?>> fetchAnnotatedClasses(final String packageName,
        final Class<? extends Annotation> annotation) {

    final Class[] parameters = new Class[] { URL.class };
    URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();
    Class sysclass = URLClassLoader.class;

    try {

        File f = new File("/tmp/class");//can make this configurable
        Method method = sysclass.getDeclaredMethod("addURL", parameters);
        method.setAccessible(true);
        method.invoke(sysloader, new Object[] { f.toURL() });
    } catch (Throwable t) {
        t.printStackTrace();


    }

    Field f = null;
    try {
        f = ClassLoader.class.getDeclaredField("classes");
    } catch (NoSuchFieldException | SecurityException e1) {

        e1.printStackTrace();
    }
    f.setAccessible(true);

    ClassLoader clLoader = Thread.currentThread().getContextClassLoader();
    Reflections reflections = null;
    try {
        reflections = new Reflections(packageName, new URL("file:/tmp/class"), clLoader);
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    Set<Class<?>> clazz = reflections.getTypesAnnotatedWith(annotation);
    return clazz;

}

publicstaticset>clazz=reflections.getTypesAnnotatedWith（annotation）；
回击声；
}