Knowing the classpath from a jar

[John]

Hello,

When i start my application from a command line like:

java -jar myjar.jar

the system property "java.class.path" only contain "myjar.jar". But in
the jar manifest i have a line like:

Class-Path: lib1.jar lib2.jar

Is it possible to have this list easily ? If the only way is to
uncompress the jar and parse the manifest file, it does not worth it
since it's just for bug reports.

TIA

 

[Thomas Fritsch]

When i start my application from a command line like:

java -jar myjar.jar

the system property "java.class.path" only contain "myjar.jar". But in
the jar manifest i have a line like:

Class-Path: lib1.jar lib2.jar

Is it possible to have this list easily ? If the only way is to
uncompress the jar and parse the manifest file, it does not worth it
since it's just for bug reports.

You can do it with the API of package java.util.jar:
JarFile jarFile = new JarFile("myjar.jar");
String s =
jarFile.getManifest().getMainAttributes().getValue("Class-Path");