How to find the JAR file from which a ava class and all successorshad been loaded.

[Peter]

Hi,

I am looking for some piece of java code which allows me to get the name
of the JAR file from which a java class (and all subsequent classes
which are used in this java class ) had been loaded by the classloader.

Any hint or idea or - even better - code is appreciated.

Thanks,


Peter

 

[Andrew Thompson]

Peter wrote:
...

I am looking for some piece of java code which allows me to get the name
of the JAR file from which a java class (and all subsequent classes
which are used in this java class ) had been loaded ..

Class files might not be in a Jar file. They might
be loose class files, or created on the fly.

Why do you think you need to know this information?
(Try and answer that in terms of "I want to offer the
end user 'X'", where X is something an end-user might
care about.)

--
Andrew Thompson
http://www.athompson.info/andrew/

Message posted via JavaKB.com
http://www.javakb.com/Uwe/Forums.aspx/java-general/200709/1

 

[Stefan Ram]

I am looking for some piece of java code which allows me to get the name
of the JAR file from which a java class (and all subsequent classes
which are used in this java class ) had been loaded by the classloader.

For the standard class loader, the system resource
corresponding to a class path (such as
»java/lang/Object.class«) can be obtained via

http://download.java.net/jdk7/docs/...ader.html#getSystemResource(java.lang.String)

 

[Real Gagnon]

I am looking for some piece of java code which allows me to get the name

of the JAR file from which a java class (and all subsequent classes
which are used in this java class ) had been loaded by the classloader.

"Determine if running from JAR"
http://www.rgagnon.com/javadetails/java-0391.html

 

[Lew]

For the standard class loader, the system resource
corresponding to a class path (such as
»java/lang/Object.class«) can be obtained via

http://download.java.net/jdk7/docs/...ader.html#getSystemResource(java.lang.String)

That gets the system resource given the name. The OP wants to get the name of
the JAR file from which a resource came, not the name of the resource,
assuming the resource came from a JAR, given the resource.

 

[=?ISO-8859-15?Q?Arne_Vajh=F8j?=]

I am looking for some piece of java code which allows me to get the name
of the JAR file from which a java class (and all subsequent classes
which are used in this java class ) had been loaded by the classloader.

Any hint or idea or - even better - code is appreciated.

private String getPath(Class cls) {
String cn = cls.getName();
String rn = cn.replace('.', '/') + ".class";
String path =
getClass().getClassLoader().getResource(rn).getPath();
int ix = path.indexOf("!");
if(ix >= 0) {
return path.substring(0, ix);
} else {
return path;
}
}

Arne