What's the different of JDK5.0 and J2SDK1.4.2?

i am a beginner of JSP,don't know which one to choose,thanks.

Use the JDK that your servlet/JSP engine supports.
Which servlet/JSP engine do you have?
If it's Tomcat 5.x or earlier, use JDK 1.4.2.
If it's WebLogic 8.1 or earlier, use JDK 1.4.2.
If it's Tomcat 5.5 or later, use JDK 1.5.
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