Currently, if you attempt to run mvn release:perform using Java 8, the Maven process will fail almost immediately because of Javadocs errors.
This is because DocLint was added in Java 8: http://openjdk.java.net/jeps/172
Also, this blog post has a list of invalid JavaDocs with Java 8 will now complain about: http://blog.joda.org/2014/02/turning-off-doclint-in-jdk-8-javadoc.html
While it is possible to disable DocLint checks, it is NOT recommended (obviously). The better route would be to cleanup our Javadocs errors (warnings are OK) so that Java 8 releases will succeed.
You can also see these errors by simply running mvn javadoc:aggregate using Java 8, as this attempts to generate Javadocs for all our modules.