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Groups > comp.lang.java.programmer > #13584

Re: the problem for accessing the classes in rt.jar

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On 4/16/2012 8:47 AM, zyng wrote:
> 			<compilerarg value="-verbose"/>

This is smart and a good idea.  It shows that the classes are being 
loaded, yes?


> The printout shows that indeed all those JAR files inside jre/lib are loaded:

Good!


> However, I need this to compile successfully:
>                  <include name="jre/lib/rt.jar"/>

This is crazy and there's no need to do this.

>
> (/A/B/java is a solft link to /A/B/jdk1.6.0_25)

This could be an issue.  Please remove all links, hard and soft, and use 
only one single canonical path.   If /A/B on your system is /usr/lib, 
use only that.  If /A/B is C:\Program Files\Java, use only that.

The Java runtime loads files according to their path names, and may 
become confused if it sees the same file twice with a different path 
name.  I haven't had problems with it myself, but if we're hunting 
obscure bugs let's eliminate all possible sources of error.


> To make my story short, my findings is that in order to compile, rt.jar must shows up twice and the path must be different from the first time by these observations:
> 1) this won't compile:
> 	<path id="project.classpath">
>             <fileset dir="/A/B/jdk1.6.0_25/">
>                  <include name="jre/lib/rt.jar"/>
>             </fileset>
>             ...
> 	</path>

This make  no sense.  Why won't it compile?  What error message do you 
get?  It's just a path, it shouldn't "compile" on its own unless you 
have a javac tag or similar.


>                  <include name="jre/lib/rt2.jar"/>

This is a horrendously bad idea and can only make matters worse.  I 
think at this point you've messed things up so bad we can't really help 
you.  Remove ALL extra files from the Java installation directory that 
you created, or delete the whole thing and reinstall it to be safe.


> (java loads rt2.jar, now my code compiles successfully)
...
 > 3)this will work(copy jre/lib to somewhere else beforehand)

Something is really badly messed up here.


> Can you help me understand this?


Can you delete your entire Java installation and re-install it?
Then please make a very simple "Hello World" program, plus its ant build 
file, and post EVERYTHING you are doing here, as well as all error 
messages and program output.  Here's a simple example for ant:

<http://ant.apache.org/manual/tutorial-HelloWorldWithAnt.html>

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the problem for accessing the classes in rt.jar zyng <xsli2@yahoo.com> - 2012-04-16 08:47 -0700
  Re: the problem for accessing the classes in rt.jar markspace <-@.> - 2012-04-16 10:22 -0700
    Re: the problem for accessing the classes in rt.jar Lew <lewbloch@gmail.com> - 2012-04-16 14:31 -0700
  Re: the problem for accessing the classes in rt.jar Arne Vajhøj <arne@vajhoej.dk> - 2012-04-17 19:51 -0400
    Re: the problem for accessing the classes in rt.jar zyng <xsli2@yahoo.com> - 2012-04-18 06:13 -0700
      Re: the problem for accessing the classes in rt.jar Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-04-18 13:48 +0000
        Re: the problem for accessing the classes in rt.jar zyng <xsli2@yahoo.com> - 2012-04-18 08:06 -0700
          Re: the problem for accessing the classes in rt.jar zyng <xsli2@yahoo.com> - 2012-04-18 08:35 -0700
            Re: the problem for accessing the classes in rt.jar Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-04-18 16:02 +0000
            Re: the problem for accessing the classes in rt.jar markspace <-@.> - 2012-04-18 09:02 -0700
              Re: the problem for accessing the classes in rt.jar zyng <xsli2@yahoo.com> - 2012-04-18 10:49 -0700
                Re: the problem for accessing the classes in rt.jar Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-04-18 18:49 +0000
          Re: the problem for accessing the classes in rt.jar Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2012-04-18 15:50 +0000
          Re: the problem for accessing the classes in rt.jar Arne Vajhøj <arne@vajhoej.dk> - 2012-04-18 21:07 -0400
      Re: the problem for accessing the classes in rt.jar markspace <-@.> - 2012-04-18 07:45 -0700

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