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Find file in external jar not in my classpath

I´m running some test and I need to get the path of a file that it´s in a jar lib that I have in my project as dependency.
This jar is not part of the classpath that I run.
If I try something like
val path = getClass.getResource("h2-1.3.161.jar").getPath
in my test it does not work.
Any idea how to find a file inside a jar without be this jar part of your classpath?
Regards.
Using the solution of astrograph I manage to get this route
java -cp //file:/D:/Users/nb38tv/workspace/f2e-core/f2e-mock/f2e-test-framework/target/f2e-test-framework-1.8.3-SNAPSHOT.jar!/h2/sakila-h2-master/h2-1.3.161.jar -ifExists -tcp -web -tcpAllowOthers
But java complain since cannot find the jar.
If I remove the ! from the path I receive this error
Unrecognized option: -ifExists
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
Any idea?
Regards

Is the file a .class file?
Can you open the file in your test?
Can you instantiate a class from that jar file?
To get to the location of a class you can use the following method:
System.out.println(this.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().getPath());

It depends on what you mean by "find" the file.
If you mean "detect if the class file exists", then you can use the Java Zip file handling routines. Inside your code, open the Jar file as a Zip file.
If you mean "use the class file" within your program, and for some reason you cannot put it on your class file (perhaps it doesn't exist in that location at startup time) then you need to use an additional class loader which will look for the file after the file is present. To do this, I recommend you reuse at URLClassLoader, even if your file is local to the disk, just use a file:/// URL.

Program runs within eclipse IDE but will not run as a jar file

My program runs fine within the eclipse ide. When I try to run it as a jar file I get the following message:
exception in thread "main" java.lang.noClassFoundError:
org/apache/logging/logfactory at
org.apache.http.conn.ssl.defaultHostNameVerifier.(BotTest.java:65) at BotTest.main(BotTest.java:100)
Caused by:Java.lang.ClassNotFoundException
I do have 4 libraries in the project and I use the option
"Extract required libraries into generated jar".

Instead of using extract required libraries into generated jar, select "package required library into generated JAR" option. It will work.

As per my comment, you may not be properly setting up the manifest file to recognize your library jar files. The manifest file should have a line that looks something like:
Class-Path: some.jar other.jar third.jar
Please also check out the many similar questions on this site.

creating .jar file with a file that calls a .jar file

Sorry if this is a little confusing. I have a java file that uses a compilation command with another jar that I want to make into an executable(not .exe). I followed an online example to make a regular jar but get the NoClassDefFoundError due to the jar that it needs to run not being included. I am not sure what I either need to add to my manifest or the jar creating command to achieve this.
Thanks

I have not written java in a long time but try this,
Export(right click and select it from options) the project you're working on
Select runnable jar file.
Decide what you want to do with libraries
Finish.
NB: Try having the class files in the same location as the jar

java.lang.NoClassDefFoundError with jar files

Uploaded a jar file from my computer to a server and tried to run it. When I run it I get java.lang.NoClassDefFoundError and it seems to be related to the twitter4j jar that my main method depends on.
However, I have this jar file in my libraries so shouldn't this be included when I build my code in to a jar? Here's a pic in case it helps.
is the error that I'm getting. (can't upload a pic just yet.

Not sure what this has to do with twitter, but anyway, the issue is that you do not have the correct class files. In other words, when you are running your fat JAR in the command prompt, you do not have any libraries exported with it (Or if you do, you don't have that specific one).
Sometimes such an error can be because there is an incorrect version of java, however that is not the case here since java has got no "twitter" packages or classes in it.
Using something like JarSplice would fix this.

Assuming you did not package the twitter4j classes inside your application jar, you need to tell Java where it can look for classes that are not inside your application jar. You typically use the classpath flag for that. In your case, it should look something like
java -cp /tmp/twitter4j.jar -jar /tmp/myapp.jar
An alternative would be to package all twitter4j's classes inside your application jar. This is called a 'fat' jar. How to make one depends on how you build your application jar.

The JAR file that you are trying to use needs to be in the classpath. This can be done by using the -cp attribute from the command line. However, when using java -jar, you cannot use the -cp attribute.
To get around this, you can do the following:
java -cp /tmp/myapp.jar;\path\to\external.jar com.example.package.MyClass
where MyClass has the main() method defined.
Alternately, you can specify jar files on the classpath using the manifest.mf file. See http://docs.oracle.com/javase/tutorial/deployment/jar/manifestindex.html for details.

where to place jar in order to run a program from command-line?

this will sound silly but i am executing my code from command prompt and have to use a jar in my class.
I have placed my jar in lib folder of JDK..
but i am still getting error of file not found
any explanation??
EDITED : guys tried all but still not working
EDIT 2 :i am trying to work as was told by this link i am using js-1.6R5.jar
Edit 3 : i undestand all the things you ppl have told but nothing working for me.. pls give me a link to upload my example that i can share with you all.
Edit 4 : i am fed up by setting classpaths but its not working... i have SDK installed in my system, do i need an extra JDK to run my programs from command prompt??

You need to add the jar to the class path by doing the following...
java -classpath D:\myprogram;D:\myprogram\lib\supportLib.jar org.mypackage.HelloWorld
Please see Wikipedia - Classpath_(Java)

You can place it anywhere, as long is you include it in your classpath. See Setting the Class Path for how to include jars in the classpath.
Have in mind that adding something in the JDK lib is almost never a good idea.

You can make a lib folder in your application's directory and put jar files there, then make your application find them by adding lib to your application's classpath.
And, don't put your jar files in JDK's lib folder. It's not good practise.

You need to let Java know that you want to include the jar in your classpath (the list of folders and jars it checks for classes). One way to do this is with the -cp command line argument, something like
java -cp ".;pathToMyJar\myJar.jar" MyClass
Another is to edit the CLASSPATH environment variable in your OS to include your jar.

A simple solution will be to place the jar fiel inside the windows folder if you are doing it in a Windows machine.

Unfortunately your question contains a lot of question signs and few information.
If you are using java.io.File to open jar as a regular file this jar should not be in lib directory. You just have to provide correct path in file system.
If however you are just trying to use jar as a part of your application it should be in classpath. Use either command line java -cp myjar.jar MyMainClassor put full path to this jar to global environment variableCLASSPATH`.