OSGi memory management

Question

I have theoretical question about OSGi memory management.

Let’s say we have some OSGi container (Felix for instance), and let’s suppose I created some bundle with memory leak.

And here are some questions that I have:

Is there any way to limit memory consumption for this “failure” bundle? For example if it exceeds memory limit – OSGi container would send me an email, uninstall it or something else?
How does memory consumption in bundle “A” affect bundle “B”. For example if “A” causes out of memory error would it blow up whole OSGi container?

Andreas Dolk · Accepted Answer · 2011-05-16T14:30:11.950

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The complete OSGi framework runs in a single virtual machine. Only that each bundle is loaded by a different classloader. But all bundles share the same heap and if one bundle leaks memory, this affects the whole OSGi based application.

So yes, if an OutOfMemoryError is caused by one bundle, the whole container is "blown up".

(BTW: if someone drops a bundle into your container that does a System.exit(), then again the whole container is stopped without a warning - bundles do not live in isolated contexts like some "virtual machines inside a jvm")

edited May 16 '11 at 14:30

answered May 16 '11 at 14:04

Andreas Dolk

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+1: The permission layer of the OSGi framework should however protect you against abusive calls to methods like `System.exit()`. – Laurent Pireyn May 16 '11 at 14:35
Thanks Andreas, that answers my question. – Sebastian Łaskawiec May 16 '11 at 19:38
Andreas, you haven't answered questions 1 - do you know if there is a way to limit a bundle's memory ? – che javara Aug 24 '12 at 20:25
I doubt that this is possible. I'm not aware of *any* mechanism that calculates the memory footprint of a collection of objects on the heap. – Andreas Dolk Aug 24 '12 at 20:59

score 4 · Answer 2 · answered Jul 22 '11 at 13:37

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You may also want to check this study: http://vmkit.llvm.org/publications/osgi_dsn.html

answered Jul 22 '11 at 13:37

Martin Ždila

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OSGi memory management

2 Answers2