Why isn't javax.activation in the java source zip?

Question

elsewhere eg.[1] it is explained that when you install the java source in ubuntu, it is put here: /usr/lib/jvm/java-6-sun-1.6.0.20/src.zip

The problem is that it does not contain the java.activation package and thus not classes like: javax.activation.DataSource Why isn't it there? Must I download the source manually to get that?

[1] http://stackoverflow.com/questions/2896727/java-jdk-source-code-where-to-find-it

Answer 1

The package is javax.activation, not java.activation - and typically, source code for javax... packages isn't included.