mediaserv-gentoo ~ # emerge -a1 oracle-jre-bin 

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These are the packages that would be merged, in order:

Calculating dependencies... done!
[ebuild  N F  ~] dev-java/oracle-jre-bin-1.7.0.13  USE="pax_kernel -X -alsa -fontconfig -jce -nsplugin" 

Fetch instructions for dev-java/oracle-jre-bin-1.7.0.13:
 * Adjusting permissions for FEATURES=distcc: '/var/tmp/tmp6L_H8C/portage/.distcc'
 * Adjusting permissions for FEATURES=distcc: '/var/tmp/tmp6L_H8C/portage/.distcc/lock'
 * Adjusting permissions for FEATURES=distcc: '/var/tmp/tmp6L_H8C/portage/.distcc/state'
 * Please download 'jre-7u13-linux-x64.tar.gz' from:
 * 'http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html'
 * and move it to '/usr/portage/distfiles'

Would you like to merge these packages? [Yes/No] y

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) dev-java/oracle-jre-bin-1.7.0.13
 * jre-7u13-linux-x64.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ...                                                             [ ok ]
>>> Unpacking source...
>>> Unpacking jre-7u13-linux-x64.tar.gz to /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work
>>> Source unpacked in /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work
>>> Preparing source in /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13 ...
 * PT PaX marking -Cm
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/java
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/java_vm
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/javaws
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/keytool
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/orbd
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/pack200
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/policytool
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/rmid
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/rmiregistry
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/servertool
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/tnameserv
 *      /var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13/bin/unpack200
 * Creating the Class Data Sharing archives
Error occurred during initialization of VM
Could not reserve enough space for code cache
 * ERROR: dev-java/oracle-jre-bin-1.7.0.13 failed (compile phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line  93:  Called src_compile
 *   environment, line 2469:  Called die
 * The specific snippet of code:
 *       bin/java -server -Xshare:dump || die;
 * 
 * If you need support, post the output of `emerge --info '=dev-java/oracle-jre-bin-1.7.0.13'`,
 * the complete build log and the output of `emerge -pqv '=dev-java/oracle-jre-bin-1.7.0.13'`.
 * The complete build log is located at '/var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13'
 * S: '/var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/work/jre1.7.0_13'

>>> Failed to emerge dev-java/oracle-jre-bin-1.7.0.13, Log file:

>>>  '/var/tmp/portage/dev-java/oracle-jre-bin-1.7.0.13/temp/build.log'