Re: How to print out the currently used JAR file path to verify it is using right JAR?

On Oct 7, 2:17 pm, markspace <-@.> wrote:


Mark:

In the classpath, there are A.jar, B.jar, C.jar, .., F.jar etc. I need
to use a class called "Abc" which is in F.jar. My code works in
Eclipse. I delievered it. It works fine on one machine and fails on
another machine. The error message is "NoSuchMethodError:
Abc.methodNewA()". So, Abc class is available(since NoClassDef error
is not shown), but the method methodNewA() is not available. I suspect
that a wrong version Abc class is used. I want to find out where Abc
class is loaded from. This is the reason I posted my initial question.
With this code:

        try
        {
            final File oddFile = new
File(Abc.class.getProtectionDomain()
                                                                   .getCode=
Source()
                                                                   .getLoca=
tion()
                                                                   .toURI()
                                                                   .getPath=
());
            System.out.println(oddFile.getAbsolutePath()); //this will
print out the JAR file which the class Abc is loaded from

        }
        catch(final Exception e)
        {
            System.out.println(e.getMessage());
        }

I found out that on the failing machine, Abc class is mistakenly
loaded from B.jar, not F.jar. And my teammate just told me that B.jar
was created at the old time. It has many things in it which were used
in the past. It also has Abc class in it, but apparently is very old
version. After careful check, we found that B.jar actually is
completely un-needed anymore. So the easy fix for us is just to delete
B.jar and let F.jar take the world.