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modify static variable

4 replies on 1 page. Most recent reply: Apr 17, 2006 7:25 AM by Thomas SMETS

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abdul jameel

Posts: 2
Nickname: abjameel
Registered: Apr, 2006

modify static variable

Posted: Apr 3, 2006 10:25 PM

Hi,
My java applicaiton is currently running. I want to modiy a static variable of a class contained in that application. I would like to fo this by running another java file, say "java modify.java". I tried to do this but it is not working. Can anyone suggest me a way to do this?

Thanks in advance for any help

Arul Murugan

Posts: 7
Nickname: appaney
Registered: Mar, 2006

Re: modify static variable

Posted: Apr 4, 2006 1:45 PM

Ahmed, I think you cannot modify static variable, this is similar to the final variable. If you need to modify it you have to declare it as instance variable i mean ordinary variable.

If i am wrong pls anybody can correct my answer.

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: modify static variable

Posted: Apr 6, 2006 2:07 AM

Of course you can modify static variables. They just don't get destroyed when the instance of the owner get's destroyed.

Static is not like static at all.
The one prevents changing, the other allows to keep a value and to use the same value between different instances.

But I don't know how to communicate between 2 different programs.

In my opinion it should NOT be possible to change variables of another program, that would be a big security issue.

To interact between programs, COM or DCOM are normally used.
Maybe Java has it's own version of it, since standard COM access is not implemented in Java (had to buy a jintegra tool for that).

abdul jameel

Posts: 2
Nickname: abjameel
Registered: Apr, 2006

Re: modify static variable

Posted: Apr 7, 2006 2:45 AM

Hi,
Thanks for your response Arul Murugan & Matthias Neumair. I found a solution for this. As my application is finally deployed in weblogic server, I wrote a jsp to access the static variable and modified it.

Thomas SMETS

Posts: 307
Nickname: tsmets
Registered: Apr, 2002

Re: modify static variable

Posted: Apr 17, 2006 7:25 AM

Well they are many options for that ...
You could just have you application pooling a property file and when the file is changed, it will just reload it... This can easily be done with a thread. Based on that approach it could just as weel pool a value in a DB.

Now the more complex approach would be to have a small RPC-server (the java word for it is RMI) to listen and you client application.

You approach (JSP) is dead simple and you should consider this a being the right way to do it... You can also use something slightly more spicy (and a bit of an overkill) for this : JMX / MBeans....

Cheers,

\T,

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