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  Read Java VM argument from file  (Read 869 times)
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Offline roland
« Posted 2014-05-02 19:52:20 »

Hey, I'm trying to make the maximum heap size customisable by editing a "memory.txt" file which contains the following:
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Xmx128m

I don't want users having to go into my bat/sh scripts in order to change the maximum memory. I'm also using an auto update system, so they can't edit the scripts (they will get overwritten on the next update)

I execute the jar file using a bat or shell script as below.

My Windows bat file version works fine:
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set /p HEAPSIZE=<memory.txt
java -%HEAPSIZE% -jar memorytest.jar


However my linux version fails (I run using sh)
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HEAPSIZE= cat 'memory.txt'
java -$HEAPSIZE -jar memorytest.jar


This works though:  Huh
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HEAPSIZE= "Xmx128m"
java -$HEAPSIZE -jar memorytest.jar


Can anyone help me get this working for linux/mac?
thanks Smiley

Offline Riven
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Hand over your head.


« Reply #1 - Posted 2014-05-02 20:02:02 »

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-    HEAPSIZE= cat 'memory.txt'
+    HEAPSIZE=`cat memory.txt`
     java -$HEAPSIZE -jar memorytest.jar


note the backticks and their location

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Offline roland
« Reply #2 - Posted 2014-05-02 20:12:09 »

Thanks!  Smiley
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