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From: zyng <xsli2@yahoo.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: the classes in rt.jar cannot be found during ant build
Date: Mon, 2 Apr 2012 17:16:39 -0700 (PDT)
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Below is a more completed build.xml. The error message 

compile:
    [javac] C:\my_work\build.xml:47: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to fals
 for repeatable builds
    [javac] Compiling 407 source files to C:\my_work\build
    [javac] C:\my_work\src\abc\efg\xml\MyXmlUtils.java:27: package com.sun.xml.internal.fastinfoset.stax does not exist
    [javac] import com.sun.xml.internal.fastinfoset.stax.StAXDocumentParser;
    [javac]                                             ^
    [javac] C:\my_work\src\abc\efg\xml\MyXmlUtils.java:28: package com.sun.xml.internal.fastinfoset.stax does not exist
    [javac] import com.sun.xml.internal.fastinfoset.stax.StAXDocumentSerializer;
    [javac]                                             ^
    [javac] C:\my_work\src\abc\efg\xml\MyXmlUtils.java:29: package com.sun.xml.internal.txw2.output does not exist
...

Those packages are located inside rt.jar. (I use Eclipse and I include rt.jar in the project property, so there is no compiling error in Eclipse).

Another observation (only happens in my office computer, not in my home computer) confuses me is that: when I copy rt.jar to rt2.jar which locates in the same directory(C:\Program Files\Java\jdk1.6.0_24\jre\lib) and modify build.xml a bit: 
        <fileset dir="${env.JAVA_HOME}">
                <include name="jre/lib/rt2.jar"/>
        </fileset>

Then ant works! Very confusing. I just re-tested this observation in my home computer and it does not work -- same error message. But this approach does work in my office computer.

<project name="myproject" default="compile" basedir=".">
	<property environment="env"/>
	<property name="build.dir" location="build"/>
	<property name="libs.dir" location="../libs"/>
	<property name="externals.dir" location="${libs.dir}/external"/>
	<property name="install.dir" location="${libs.dir}/installed"/>

	<path id="project.classpath">
        <fileset dir="${env.JAVA_HOME}">
                <include name="jre/lib/rt.jar"/>
        </fileset>
		<pathelement location="${build.dir}"/>
		<fileset dir="${externals.dir}">
			<include name="abc.jar"/>
			<include name="xyz.jar"/>
			<include name="junit.jar"/>
		</fileset>
	</path>

	<target name="compile">
		<javac srcdir="${src.dir}" destdir="${build.dir}" compiler="modern" fork="yes" debug="on">
			<classpath refid="project.classpath"/>
			<compilerarg value="-Xlint"/>
		</javac>
	</target>
</project>