Class.forName（）无法找到其他项目文件的类路径

Question

I have created a plugin to fetch the fields of a particular .java file for that I am using following code:

Class<?> forName = Class.forName(refPath);//refPath = "xyz.test"
Field[] declaredFields = forName.getDeclaredFields();
for (Field field : declaredFields) {
    String name = field.getName();
}

When I deployed this plugin in to the workspace, it is perfectly working for its plugin project but not fetching fields for other project of same workspace. throwing exception ClassNotFound, obviously classloader is not able to find other projects file.

Is there any way i can get the file information for other projects(plugin/non plugin)of same workspace where plugin is deployed?

Answer 1

AS stated in the comment, you need the java class containers (JAR?) to be in your classpath.

Whether you can do it statically, and add the other archive to your classpath when starting your JVM, Or you can try to add it dynamicaly.

To do it, here is what you can do :

/**
 * Adds a jar file dynamically to the current class path
 * @param jarFile
 */
private static void addToClassPath(File jarFile) {
    try {
        System.out.println("adding " + jarFile.getAbsolutePath() + " to classpath");
        URL u = jarFile.toURI().toURL();
        URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader();

        /* Here is a trick to call URLClassLoader.addURL whereas this method is 'protected' */
        Class sysclass = URLClassLoader.class;
        Method method = sysclass.getDeclaredMethod("addURL", sysClassLoaderParams);
        method.setAccessible(true);
        method.invoke(sysloader, new Object[] { u });
    } catch (Exception e) {
        System.out.println("Error while updating classpath: "+ e.toString());
    }
}