Where is the JAR currently being executed?

Thread view:

Mark Space - 17 Mar 2007 16:44 GMT

Hi all, here's a basic question I haven't been able to find the answer to.

Let's say I'm executing a JAR from the command line from a location that
isn't in the CLASSPATH. The JAR implements it's own classLoaders and
wants to use data in the JAR to construct some classes. How does the
classLoader (or I guess any other method) locate the JAR file being
executed so it can load some resources?

OK, same question, but this time my JAR file is contained inside another
JAR file. Now how do I find it?

Reply to this Message

Thomas Kellerer - 17 Mar 2007 17:17 GMT

Mark Space wrote on 17.03.2007 16:44:

> Hi all, here's a basic question I haven't been able to find the answer to.
>
[quoted text clipped - 3 lines]
> classLoader (or I guess any other method) locate the JAR file being
> executed so it can load some resources?

getClass().getResourceAsStream()

Thomas

Reply to this Message

Mark Space - 17 Mar 2007 17:42 GMT

> Mark Space wrote on 17.03.2007 16:44:
>>
[quoted text clipped - 5 lines]
>
> getClass().getResourceAsStream()

I was probably unclear with that last bit. I mean resources
generically, not specificaly a Java Resource.

Let's say I want to muck with the class search order, loading classes
from my package space first from the current JAR. Then defaulting to
the parent classLoader only if the class isn't found locally.

Hmm, is a class a resource? I haven't actually tested this yet.

Can I getResourceX("/classes/MyPackage/subpackage/MyClass.class"); ?

Reply to this Message

Thomas Kellerer - 17 Mar 2007 18:07 GMT

Mark Space wrote on 17.03.2007 17:42:

>> Mark Space wrote on 17.03.2007 16:44:
>>>
[quoted text clipped - 8 lines]
> I was probably unclear with that last bit. I mean resources
> generically, not specificaly a Java Resource.

What do you mean with "Java Resource"?

Any file in the .jar can be loaded using the stream returned by
getResourceAsStream().

Reply to this Message

Joshua Cranmer - 17 Mar 2007 18:10 GMT

>> Mark Space wrote on 17.03.2007 16:44:
>>>
[quoted text clipped - 16 lines]
>
> Can I getResourceX("/classes/MyPackage/subpackage/MyClass.class"); ?

Why don't you test it to find out? You could answer your own question.

I believe the answer is yes, although this is a spur-of-the-moment,
untested answer, whose validity should not be trusted.

Reply to this Message

fy4.net@gmail.com - 18 Mar 2007 09:26 GMT

> Hi all, here's a basic question I haven't been able to find the answer to.
>
[quoted text clipped - 6 lines]
> OK, same question, but this time my JAR file is contained inside another
> JAR file. Now how do I find it?

More see here!
http://www.flash50.com/index.php

Reply to this Message

Andrew Thompson - 18 Mar 2007 10:09 GMT

On Mar 18, 7:26 pm, "fy4....@gmail.com" <fy4....@gmail.com> wrote:
..

> More see here!

Oh, more stupid messages. I could pass the
first one off as you being an imbecile, but
this is becoming more like a concerted
spamming effort.

Andrew T.

Reply to this Message

Where is the JAR currently being executed?

Free Magazines