>>> Emerging (1 of 231) dev-java/sun-javamail-1.4.2
 * javamail-1.4.2-src.zip RMD160 SHA1 SHA256 size ;-) ...                [ ok ]
 * checking ebuild checksums ;-) ...                                     [ ok ]
 * checking auxfile checksums ;-) ...                                    [ ok ]
 * checking miscfile checksums ;-) ...                                   [ ok ]
 * Using: sun-jdk-1.6
>>> Unpacking source...
>>> Unpacking javamail-1.4.2-src.zip to /var/tmp/portage/dev-java/sun-javamail-1.4.2/work
>>> Source unpacked in /var/tmp/portage/dev-java/sun-javamail-1.4.2/work
>>> Preparing source in /var/tmp/portage/dev-java/sun-javamail-1.4.2/work ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-java/sun-javamail-1.4.2/work ...
Rewriting attributes
Traceback (most recent call last):
  File "/usr/lib64/javatoolkit/bin/xml-rewrite-3.py", line 30, in <module>
    from javatoolkit.xml.DomRewriter import DomRewriter
ImportError: No module named javatoolkit.xml.DomRewriter
 * If the output above contains:
 * ImportError:
 * /usr/lib/python2.4/site-packages/_xmlplus/parsers/pyexpat.so:
 * undefined symbol: PyUnicodeUCS2_DecodeUTF8
 * Try re-emerging dev-python/pyxml
 * 
 * ERROR: dev-java/sun-javamail-1.4.2 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_configure
 *             environment, line 4227:  Called java-ant-2_src_configure
 *             environment, line 2132:  Called java-ant_bsfix
 *             environment, line 2154:  Called java-ant_bsfix_files './build.xml'
 *             environment, line 2249:  Called _bsfix_die 'xml-rewrite2 failed: ./build.xml'
 *             environment, line  313:  Called die
 * The specific snippet of code:
 *           die ${1} " Look at the eerror message above";
 *  The die message:
 *   xml-rewrite2 failed: ./build.xml  Look at the eerror message above
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/dev-java/sun-javamail-1.4.2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/sun-javamail-1.4.2/temp/environment'.
 * 
!!! When you file a bug report, please include the following information:
GENTOO_VM=sun-jdk-1.6  CLASSPATH="" JAVA_HOME="/opt/sun-jdk-1.6.0.14"
JAVACFLAGS="-source 1.4 -target 1.4" COMPILER=""
and of course, the output of emerge --info

>>> Failed to emerge dev-java/sun-javamail-1.4.2, Log file:

>>>  '/var/tmp/portage/dev-java/sun-javamail-1.4.2/temp/build.log'

 * Messages for package dev-java/sun-javamail-1.4.2:

 * If the output above contains:
 * ImportError:
 * /usr/lib/python2.4/site-packages/_xmlplus/parsers/pyexpat.so:
 * undefined symbol: PyUnicodeUCS2_DecodeUTF8
 * Try re-emerging dev-python/pyxml
 * 
 * ERROR: dev-java/sun-javamail-1.4.2 failed.
 * Call stack:
 *               ebuild.sh, line   49:  Called src_configure
 *             environment, line 4227:  Called java-ant-2_src_configure
 *             environment, line 2132:  Called java-ant_bsfix
 *             environment, line 2154:  Called java-ant_bsfix_files './build.xml'
 *             environment, line 2249:  Called _bsfix_die 'xml-rewrite2 failed: ./build.xml'
 *             environment, line  313:  Called die
 * The specific snippet of code:
 *           die ${1} " Look at the eerror message above";
 *  The die message:
 *   xml-rewrite2 failed: ./build.xml  Look at the eerror message above
 * 
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/dev-java/sun-javamail-1.4.2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/sun-javamail-1.4.2/temp/environment'.
 * 

 * IMPORTANT: 1 news items need reading for repository 'gentoo'.
 * Use eselect news to read news items.