I need to read the Manifest
file, which delivered my class, but when I use:
getClass().getClassLoader().getResources(...)
I get the MANIFEST
from the first .jar
loaded into the Java Runtime.
My app will be running from an applet or a webstart,
so I will not have access to my own .jar
file, I guess.
I actually want to read the Export-package
attribute from the .jar
which started
the Felix OSGi, so I can expose those packages to Felix. Any ideas?
You can do one of two things:
Call getResources()
and iterate through the returned collection of URLs, reading them as manifests until you find yours:
Enumeration<URL> resources = getClass().getClassLoader()
.getResources("META-INF/MANIFEST.MF");
while (resources.hasMoreElements()) {
try {
Manifest manifest = new Manifest(resources.nextElement().openStream());
// If the line above leads to <null> manifest Attributes try from JarInputStream:
// Manifest manifest = resources.nextElement().openStream().getManifest();
// check that this is your manifest and do what you need or get the next one
...
} catch (IOException E) {
// handle
}
}
You can try checking whether getClass().getClassLoader()
is an instance of java.net.URLClassLoader
. Majority of Sun classloaders are, including AppletClassLoader
.
You can then cast it and call findResource()
which has been known - for applets, at least - to return the needed manifest directly:
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
}