JVM is not safe enough.
JVM is reading its policy in ".java.policy" file in the directory under J2SDK or JRE.
However, the file is a text file with no attributes, and can be changed without any notice.
If some professional hackers want to attack your JVM, they only send a new ".java.policy" file to you and your computer opens its door to any applet to write/read your other files in your computer.
This is very dangerous and I think that it is a loophole.
Hi,
JVM is reading its policy in ".java.policy" file in
the directory under J2SDK or JRE.
However, the file is a text file with no attributes,
and can be changed without any notice.
If some professional hackers want to attack your JVM,
they only send a new ".java.policy" file to you and
your computer opens its door to any applet to
write/read your other files in your computer.
This is very dangerous and I think that it is a
loophole.This way no language is secure,if you have the control(total) of the system where your software is running you can do anything with the software related sources hence absolutely no security.So to get the control of the policy files means poor sys adminsitration already pointed by jchell.
Regards
Vicky
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make: *** [Sample.class] Error 3
Running without the 6G limit and setting Xmx12000M doesn't help.
I hope someone can shed some light into what's going on here. Why on earth would Java think it needs 12G memory to run? And why, when it gets it, is it still not enough?
Thanks,
Calletschodt wrote:
Cramgo wrote:
strace shows that java is trying to allocate 25% of my memory, ie 12G, and my virtual memory limit is 6G.Maybe you have found a bug, the default max heap size calculation is supposed to cap it at 1G.
[http://java.sun.com/performance/reference/whitepapers/tuning.html#section4.1.1]
So should I report it somewhere or what?
After finally finding out how to pass -Xmx4096M to jar,javah,javac,java many programs compile fine
Are you setting one of [_JAVA_OPTIONS|http://java.sun.com/j2se/1.5.0/docs/guide/2d/flags.html] or [JAVA_TOOLS_OPTIONS|http://java.sun.com/javase/6/docs/platform/jvmti/jvmti.html#tooloptions] for all shells?
No, passing -Xmx4096m to java, and -J-Xmx4096m to javac, javah and jar. Is JAVA_OPTIONS or JAVA_TOOLS_OPTIONS better, how do I use those?
but when I compile an app (containing main):
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Consult the following stack trace for details.
java.lang.OutOfMemoryError: Java heap space
make: *** [Sample.class] Error 3Running without the 6G limit and setting Xmx12000M doesn't help.Forgot to specify -Xms and-Xmx?Promise not to laugh. Seems like I somehow got rid of that m.... running with a heap size of 12000 bytes might be a bit sparse, admittedly. ;) Caught it when I added -Xms...
I hope someone can shed some light into what's going on here. Why on earth would Java think it needs 12G memory to run? And why, when it gets it, is it still not enough?OK so I now can compile again, great. Would be lovely to get rid of the -Xmx but I can live with that... -
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You should ask in Illustrator
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Error occurred during initialization of VM. Could not reserve enough space
Dear All,
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Error occurred during initialization of VM
Could not reserve enough space for object heap
[Thr 6008] JLaunchIAbortJava: abort hook is called
[Thr 6008] **********************************************************************
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[Thr 6008] JLaunchCloseProgram: good bye (exitcode = -2)
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May I request all of you to kindly help me on above issue? Please let me know if you need any more information.
Waiting for your kind replies.
Regards,
FaisalDears,
Thank you very much for your replies. The heap size was 1024. I changed it to the below:
Heap Size=512 (earlier 1024)
Changed below paramters in configtool:
-Xmx512m (earlier 1024)
-Xms256m (earlier 1024)
Hope this information will be helpful to others as well.
Once again, I thank both of you to guide me in proper directions.
Regards,
Faisal -
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