How to load resource from jar file packaged in a war file? [duplicate]

Question

I need to load a property file from the jar. The jar is included in war file. Here is the structure

ROOT.war
  WEB-INF
     lib
       my.jar

here my.jar has following structure

my.jar
  com
    test
      myservlet.class
  WEB-INF
    test.property

Now I have written following code in one of my servlet as follows:

InputStream stream = getServletContext().getResourceAsStream("/WEB-INF/test.properties");
Properties prop = new Properties();
prop.load(stream );

but above code I got stream as null. If I put the property file in ROOT.war/WEB-INF it works fine. I have fair idea that if path in getResourceAsStream starts with '/' than it search resource in context root. But how can I read resource which lies in a jar which again found in WEB-INF/lib of root application?

Thanks & Regards, Amit Patel

Answer 1

Put it in root of the JAR and get it by context classloader instead of servletcontext.

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream input = classLoader.getResourceAsStream("test.properties");
// ...

The /WEB-INF folder convention is specific to WAR files, not to JAR files. Get rid of it. If you really need a separate JAR folder which is to be part of the classpath, use /META-INF instead.

ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream input = classLoader.getResourceAsStream("META-INF/test.properties");
// ...