Javamex - Java programming and performance

Java programming and performance

Discussion of medium to advanced level topics of Java programming, including Java performance.

Latest Activity

Neil - I think you've done an impressive job with your thread-profiling package. Let me relay my experience on the subject, which is in plenty of languages, but not yet in Java. Ever play one of those arcade games where something pops up and you n...

10 hours ago

Michael R. Dunlavey is now a member of Javamex

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10 hours ago

Neil Coffey replied to Günter's discussion 'Classmexer gives wrong results'

Please take a look at the updated version of Classmexer I've posted which should resolve the issues you mention.

November 3

Neil Coffey replied to Günter's discussion 'Classmexer gives wrong results'

Thanks I'll have a look at these issues.

November 3

Günter added a discussion

Classmexer gives wrong results

Hi Neil, first of all, thank you for all your efforts on javamex in general and with classmexer in particular. Unfortunately I have to say that the results of classmexer (0.02b on jdk 1.5.0) are plainly wrong. After some experimentation, I found...

November 3

Günter is now a member of Javamex

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November 3

EDH replied to EDH's discussion 'Concurrent Hashmap'

Thanks for the fast and good advise ! Regarding your question whether it matters if a threads continue to reference the old map while the new one is actually loaded. It could matter. But in either case I'll investigate a bit more the first (vola...

October 27

Neil Coffey replied to EDH's discussion 'Concurrent Hashmap'

Sorry, some of my answer got chopped. Agh! So with FutureTask, you have a volatile reference to a FutureTask, whose call() method loads the data: private volatile FutureTask < Map> ft; Then your loadMapData() actually replaces the ft: private ...

October 26

Neil Coffey replied to EDH's discussion 'Concurrent Hashmap'

There are a number of solutions to this depending on a few details of your requirements. I would probably opt for a plain old (possibly read-only) HashMap to store the data, and concentrate on the problem of how you manage the REFERENCE to this h...

October 26

EDH added a discussion

Concurrent Hashmap

I've read http://www.javamex.com/tutorials/synchronization_concurrency_8_hashmap.shtml I'm wondering what the best and most performant option is given that my HashMap will be read intensively by multiple threads whereas it will be only sporadical...

October 26

EDH is now a member of Javamex

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October 26

Yvonne Morris is now a member of Javamex

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September 30

Cory added a discussion

Classmexer agent throwing illegalaccess error

Hi Neil, I would really love to use the classmexer agent. When running it from a standalone application, things work great for me. When I include the file in my web application, deployed to oc4j, I get an IllegalAccessError. I believe this error ...

September 23

Sven Turnau replied to Sven Turnau's discussion 'Not blocking character input'

Sorry! I do not wish to wait for the CR (Return Key). Thanks.

September 22

Sven Turnau added a discussion

Not blocking character input

I wish to read from console character after character and not waiting for pushing the key. Thanks.

September 22

Sven Turnau is now a member of Javamex

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September 22