Q:

Where to find 'javax.lang' and 'javax.annotation' in ubuntu

I'm working on a java project which depends on both 'javax.lang' and 'javax.annotation'. I have jre/jdk installed, a lot of other javax.* on the classpath, and I develop in Java everyday. However, these two packages remain not found.
Thank you

A:

javax.lang and javax.annotation appear to be available since version Java 6. They're not present in Java 5 or earlier versions. You ought to be using a Java 6 JDK for the purpose of development.

