What is the purpose of classlist file

Question

Can someone please explain the purpose of "classlist" file and rt.jar files in java?

I need to figure out whether the particular project is shipping Swing Layout Extensions package or not.

Inside my project directory I see "swing" references in two places:

Inside ../jre/lib/classlist file: javax/swing/JFrame javax/swing/WindowConstants javax/swing/RootPaneContainer
Inside rt.jar there are a number of swing classes

However inside my project there isn't any swing-layout.jar file.

So does that mean that the project is shipping Swing Layout packages or not?

This question would help http://stackoverflow.com/questions/4692076/speed-up-application-start-by-adding-own-application-classes-to-classes-jsa — Laksitha Ranasingha, Sep 19 '16 at 22:54
I think all those classes are mentioned inside the *project*. Though, if you are new in Java, why do you need to know this information? — OneCricketeer, Sep 19 '16 at 22:56

score 3 · Answer 1 · edited May 23 '17 at 10:34

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To speed up the startup time of the JVM, the Sun developers decided it is a good idea to precompile the standard runtime classes for a platform during installation of the JVM. These precompiled classes can be found e.g. at:

$JAVA_HOME\jre\bin\client\classes.jsa

another one asked this question there : Speed up application start by adding own application classes to classes.jsa

it will help you .

edited May 23 '17 at 10:34

Community

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answered Sep 19 '16 at 22:48

Ahmed Gamal

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Partly copying another question and posting it as an answer doesn't help. you should have at least referred that thread. – Laksitha Ranasingha Sep 19 '16 at 22:53
i am trying to this already but iam logging in from my mobile and i can't update my answer .. !! – Ahmed Gamal Sep 19 '16 at 22:56

What is the purpose of classlist file

1 Answers1