CODEWITHSUNDEEP
javatomcatjarclasspath
Olga Telezhnikova
Olga Telezhnikova

Reputation: 41

How to get all jar from classpath of Tomcat application?

I need to write new module, which is able to get all application's jar in runtime.

I try do it with getting inforimation with Classloader.getSystemClassloader(), but catalina.bat in Tomcat override variable of classpath.

So, next idea was to recursively iterate through all the target folders and look for a lib folder. In my module I wrote :

public class MainServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        File currentDir = new File(getServletContext().getRealPath("/")); // current directory
        System.out.println("Cur dir: " + currentDir);
        displayDirectoryContents(currentDir);
    }
}

I got this result:

Cur dir: C:\Java\apache-tomcat-7.0.56\webapps\jar

This is path to my war, which I added to application. But I need the path to the application itself.

So, have you any idea?

Upvotes: 4

Views: 5138

Answers (2)

Crazyjavahacking
Crazyjavahacking

Reputation: 9717

Java EE applications have customized ClassLoader hierarchy.

public class MainServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) {
        ClassLoader effectiveClassLoader = getClass().getClassLoader();
        URL[] classPath = ((URLClassLoader) effectiveClassLoader).getURLs();
        ...
    }
}

Upvotes: 4

Scott Sosna
Scott Sosna

Reputation: 1413

You want the classloader for your application, not Tomcat. Get the classloader for the servlet - this.getClass().getClassLoader() or MainServlet.getClassLoader() should both work.

Upvotes: 0

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