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From Pawel Plaszczak <>
Subject does ant modify the requested classpath?
Date Tue, 25 Mar 2003 00:33:11 GMT
Ant seems to be using a different classpath than I request. I hope someone 
can explain the following behavior:

I use java 1.4.1 and Apache Ant version 1.5 compiled on July 11 2002. 
Having compiled Axis, I run one of the samples (samples.jms.JMSTest) using 
a simple Ant script I wrote. I got this:      
     [java] java.lang.LinkageError: loader constraints violated when 
linking org/xml/sax/InputSource class

This looked like Axis the version of org.xml.sax.InputSource was different 
than during the compilation. To see what's going on, I made Ant print the 
classpath just before running the java task, like this:

  <property name="cp" refid="mypath"/>
  <target name="run">
    <echo message="running, classpath = ${cp}" />

Analysis of the printed classpath showed that the InputSource being 
invoked came from the following jar:
/usr/share/ant/lib/xml-apis.jar :
          1110 Wed Feb 06 10:49:46 CST 2002 org/xml/sax/InputSource.class

However, that's the same jar file that was used during the compilation, so 
everything seemed okay.

But then I took the classpath Ant printed, and I run the same class 
manually (using java instead of ant), with the same classpath. It went 
through fine and did not return the error!

So I am guessing that ant is in fact using different classpath than I tell 
it to. In fact, when I run ant -diagnostics, among other information this 
was printed: 

sun.boot.class.path : ....

Indeed, one jar file from that class path 
(/usr/local/j2sdk1.4.1_01/jre/lib/rt.jar) contains another version of the 
InputSource class.
However I don't know the meaning of sun.boot.class.path property and if 
this information is related to my problem. 

Is Ant indeed prepending sun.boot.class.path to the classpath I request? 
What is the most reliable way to see what classpath is being eventually 


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