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Hi!

I always run a Java class which takes a lot of memory, and every time
I have to set the maximum memory to some value. For example:

java -Xmx512m MyClass

How do I set this flag to be the default to all the future invocations
of the JVM? I didn't want to type that every time. I know I can set
the default Swing flags in the file $JDK_HOME/jre/lib/
swing.properties. Is there an equivalent of that file to the JVM (not
Swing related)?

Thanks!

CD1 wrote:
> Hi!
>
> I always run a Java class which takes a lot of memory, and every time
> I have to set the maximum memory to some value. For example:
>
> java -Xmx512m MyClass
>
> How do I set this flag to be the default to all the future invocations
> of the JVM? I didn't want to type that every time. I know I can set
> the default Swing flags in the file $JDK_HOME/jre/lib/
> swing.properties. Is there an equivalent of that file to the JVM (not
> Swing related)?
>
> Thanks!
You can create a script file that starts "java" with the appropriate
arguments.

--
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>

On Sun, 22 Jun 2008 11:10:47 -0700 (PDT), CD1
<> wrote, quoted or indirectly quoted someone
who said :

>I always run a Java class which takes a lot of memory, and every time
>I have to set the maximum memory to some value. For example:
>
>java -Xmx512m MyClass

one way is to write a kicker, a tiny C program that uses a C-exec to
launch with the default switches you want.

See http://mindprod.com/project/kicker.html
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Yeah, that's what I'm going to do if nothing else works. I thought
there was an official way of doing that, using a properties file. But
thanks anyway, I'll do it as you said!

Roedy Green wrote:
> On Sun, 22 Jun 2008 11:10:47 -0700 (PDT), CD1
> <> wrote, quoted or indirectly quoted someone
> who said :
>> I always run a Java class which takes a lot of memory, and every time
>> I have to set the maximum memory to some value. For example:
>>
>> java -Xmx512m MyClass
>
> one way is to write a kicker, a tiny C program that uses a C-exec to
> launch with the default switches you want.

If one want to spend the time to create a program to start
with then it is minimal extra work to actually start the JVM
instead of spawn/exec java.exe !

Arne

On Sun, 22 Jun 2008 15:58:26 -0400, Arne Vajhøj <>
wrote, quoted or indirectly quoted someone who said :

>If one want to spend the time to create a program to start
>with then it is minimal extra work to actually start the JVM
>instead of spawn/exec java.exe !

You can do it with a bat file, which is a generic sort of kicker, and
somewhat larger than the C kicker would be. The C kicker does nothing
but the EXEC. A shell has the full ability to interpret scripts.

The C kicker has the advantage you can put it in the aux path in the
registry, which you can't do with bat files. See
http://mindprod.com/jgloss/registry.html

If you write a kicker, you can stomp them out like cookies, with theme
and variations for various purposes. My kicker project, originated in
the DOS days, was to make it possible to create them without a C
compiler or programming knowledge.
--

Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

Wayne wrote:
> Roedy Green wrote:
>> On Sun, 22 Jun 2008 15:58:26 -0400, Arne Vajhøj <>
>> wrote, quoted or indirectly quoted someone who said :
>>> If one want to spend the time to create a program to start
>>> with then it is minimal extra work to actually start the JVM
>>> instead of spawn/exec java.exe !
>>
>> You can do it with a bat file, which is a generic sort of kicker, and
>> somewhat larger than the C kicker would be. The C kicker does nothing
>> but the EXEC. A shell has the full ability to interpret scripts.
>>
>> The C kicker has the advantage you can put it in the aux path in the
>> registry, which you can't do with bat files. See
>> http://mindprod.com/jgloss/registry.html
>>
>> If you write a kicker, you can stomp them out like cookies, with theme
>> and variations for various purposes. My kicker project, originated in
>> the DOS days, was to make it possible to create them without a C
>> compiler or programming knowledge.
>
> Didn't there used to be (or is there still) a "jvm.cfg" text file one
> could edit for this?

It is still there in 1.6, but can you set Xmx in that ?

Arne