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Reading the Manifest of Your Own Jar
Accessing the Manifest file associated with your own class can be a challenge, especially when using getClass().getClassLoader().getResource(...). This method may return the manifest from a different .jar file if called from an applet or webstart environment.
To overcome this limitation, consider the following solutions:
1. Iterating Through Manifest URLs
Iterate through the URLs returned by getResource(...) and read them as manifests until you find the correct one:
Enumeration<URL> resources = getClass().getClassLoader() .getResources("META-INF/MANIFEST.MF"); while (resources.hasMoreElements()) { try { Manifest manifest = new Manifest(resources.nextElement().openStream()); // check that this is your manifest and do what you need or get the next one ... } catch (IOException E) { // handle } }
2. Using URLClassLoader
If getClass().getClassLoader() is an instance of java.net.URLClassLoader, you can cast it and use findResource(...):
URLClassLoader cl = (URLClassLoader) getClass().getClassLoader(); try { URL url = cl.findResource("META-INF/MANIFEST.MF"); Manifest manifest = new Manifest(url.openStream()); // do stuff with it ... } catch (IOException E) { // handle }
This approach has been known to return the correct manifest for applets.
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