Java read a file from jar which is in lib folder of a war

Question

I have Spring application in which i am trying to read xml file from jar which is in lib folder of my build application war ie /WEB-INF/lib/abc.jar.

Right now i am using this code.

InputStream reader = SomeClassInabcJars.class
                          .getResourceAsStream("/META-INF/spring/beans.xml");

After this i am using DOM parser to get all bean tags from it.

If i deploy this application using command mvn tomcat:run, i am getting proper beans.xml. But if i deploy war of this application manually in tomcat then it seems there are some new bean tags in beans.xml and some bean tags are missing from it.

If i extract this war and open that abc.jar's beans.xml, it seems correct. I think this beans.xml changes at runtime.

Answer 1

I found a solution to read any file from jar which is in lib folder of a build application war file and it worked for me.

InputStream reader = null;
for (URL url : ((URLClassLoader) (Thread.currentThread()
        .getContextClassLoader())).getURLs()) {
    if (url.getPath().contains("notification-engine")) {
        String inputFile = "jar:file:" + url.getPath()
                + "!/META-INF/spring/beans.xml";
        URL inputURL = null;
        try {
            inputURL = new URL(inputFile);
            JarURLConnection conn = (JarURLConnection) inputURL
                    .openConnection();
            reader = conn.getInputStream();
        } catch (MalformedURLException e1) {
            System.err.println("Malformed input URL: " + inputURL);
        } catch (IOException e1) {
            System.err.println("IO error open connection");
        }
        break;
    }

}

It read /META-INF/spring/beans.xml file from path(its a jar path) contain notification-engine.