how to get project's classpath under wildfly

[hai_feng]

Hi everybody！

Today I meet a problem what is described as follows:

In the past,I used the follow code to get the project's classpath:

URL resourceURL = Thread.currentThread().getContextClassLoader().getResource("");

this function can get the classpath of project on tomcat,but can't on wildfly.

Following is my test demo:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  // TODO Auto-generated method stub
     URL resourceURL = Thread.currentThread().getContextClassLoader().getResource("com/classloader/test/TestPath.class");
        URL resourceURL1 = Thread.currentThread().getContextClassLoader().getResource("");
        URL resourceURL2 = Thread.currentThread().getContextClassLoader().getResource("/");
        URL resourceURL3 = TestPath.class.getResource("");
       
        System.out.println("Function-------Thread.currentThread().getContextClassLoader().getResource('com/classloader/test/TestPath.class'):");
        System.out.println(resourceURL.getPath());
        System.out.println();
        System.out.println("Function-------Thread.currentThread().getContextClassLoader().getResource(''):");
        System.out.println(resourceURL1.getPath());
        System.out.println();
        System.out.println("Function-------Thread.currentThread().getContextClassLoader().getResource('/'):");
        System.out.println(resourceURL2.getPath());
        System.out.println();
        System.out.println("Function-------TestPath.class.getResource(''):");
        System.out.println(resourceURL3.getPath());
    }

now I deploy it on tomcat,the console print as follow:

but when i deploy it on wildfly,the console print as follow:

you can see that the function:

URL resourceURL1 = Thread.currentThread().getContextClassLoader().getResource("");

has different result between tomcat and wildfly,it can get project's classpath on tomcat,but it get "JBOSS_HOME/modules/system/layers/base/org/jboss/as/ejb3/main/timers/"，we all know that this path isn't project's classpath.

So i want to know what mean of "JBOSS_HOME/modules/system/layers/base/org/jboss/as/ejb3/main/timers/",why a same fuction can get different result path on different web server?

And who can tell me how to get project's classpath(JBOSS_HOME/bin/content/testpath.war/WEB-INF/classes/) directly under wildfly?what api i can use?

and you can see that my war is located under JBOSS_HOME/bin ，the follow methor can sovle it:

public String getRealFilePath(String aFilePath) throws Exception
  {
     org.jboss.vfs.VirtualFile vFile = org.jboss.vfs.VFS.getChild(aFilePath);
     URI fileNameDecodedTmp = org.jboss.vfs.VFSUtils.getPhysicalURI(vFile);
     String path = fileNameDecodedTmp.getPath();
     return path;
  }

Please help!

Thanks!

[jameslivingston]

It can do that because calling getResource() with a directory path is not defined. With many classloaders it returns the URL of the directory, but it doesn't have to. I would think passing the empty string is even less defined, and you probably should use "/" if you really want to do it.

There is no properly portable way to get the path to your WEB-INF/classes directory, one major reason being that it may not even exist (if the server doesn't explode the WAR as an implementation detail). servletContext.getRealPath("WEB-INF/classes") may work, but again I don't think is portable to rely on that.

Why do you want to know the location of your own classes directory?

[hai_feng]

Okay James,thanks your reply firstly.as you said "you probably should use "/" if you really want to do it." ,I guess you were ignore of my demo.you can see that i had writed "URL resourceURL2 = Thread.currentThread().getContextClassLoader().getResource("/");  "in my demo,but it print "JBOSS_HOME/modules/system/layers/base/org/jboss/as/ejb3/main/timers/" also.So i want to know why it gets the directory is "JBOSS_HOME/modules/system/layers/base/org/jboss/as/ejb3/main/timers/"?

follow your second advice,I try to use "servletContext.getRealPath("WEB-INF/classes")" to get directory of classes,and it works.

About your question "Why do you want to know the location of your own classes directory?",what i can tell you is that we project has this requese,and i want to use this chance to learn wildfly‘s classloader,Do you know more about that?Please help!

Thanks!