There are classes/dirs in the jar reorder exclusion list (named: not_rt_jar.list) that no longer exist. These are causing warnings during the build. The list of missing classes is different for each platform (Solaris, Linux, Windows). Here's an example of the messages from the Solaris platform:

(cd /HUDSON/workspace/jdk7-2-build-solaris-i586-product/jdk7/build/solaris-i586/../solaris-i586-fastdebug/classes && \
/localtools/solaris-i586/jdk1.6.0_14/bin/java -XX:-PrintVMOptions -XX:+UnlockDiagnosticVMOptions -XX:-LogVMOutput -client -Xmx896m -Xms128m -XX:PermSize=32m -XX:MaxPermSize=160m -jar /HUDSON/workspace/jdk7-2-build-solaris-i586-product/jdk7/build/solaris-i586/../solaris-i586-fastdebug/btjars/jarreorder.jar \
-o /HUDSON/workspace/jdk7-2-build-solaris-i586-product/jdk7/build/solaris-i586/../solaris-i586-fastdebug/tmp/reorder/file_list.temp /HUDSON/workspace/jdk7-2-build-solaris-i586-product/jdk7/build/solaris-i586/../solaris-i586-fastdebug/lib/classlist /HUDSON/workspace/jdk7-2-build-solaris-i586-product/jdk7/build/solaris-i586/../solaris-i586-fastdebug/tmp/not_rt_jar.list . )

WARNING: Path does not exist as file or directory: META-INF/services/com.sun.tools.xjc.Plugin
WARNING: Path does not exist as file or directory: com/sun/crypto/provider