classes.jsa – Interesting !

When I saw 4 JREs in my machine, was curious to see how the sizes differ, and they differ indeed. There is a big jump from 1.4.x to 1.5.x –

The biggest difference was an ~11 MB file called classes.jsa. I have been away from active programming for sometime back, after having moved into management (having last worked with JDK 1.4.x)  – But it was interesting reading – Sun has a page on this file – Class Data Sharing – Interesting, need to give it a read and understand it is all about.

BTW, in a previous post Windows Folder Size – JDiskReport, I had mentioned how JDiskReport can provide a nice analysis of a folder’s contents – This helped when I wanted to see how the JRE sizes varied, and so it is true that the JRE is growing by each release.

Some screenshots –

Pie Chart

Bar Chart 

Love the JGoodies stuff –


One Response to classes.jsa – Interesting !

  1. It could be a very valuable item of information and facts. I will be pleased that you just embraced this beneficial information around. You need to keep us advised in this way. Many thanks for revealing.

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