AppContext issue in Apple Java 6 -- same issue in Oracle Java 7? (original) (raw)
Artem Ananiev artem.ananiev at oracle.com
Tue Jul 9 07:43:03 PDT 2013
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On 7/7/2013 8:50 PM, Andrew Thompson wrote:
On Jul 3, 2013, at 5:18 AM, Artem Ananiev wrote:
2. In applet/webstart modes, there may be multiple AppContexts in the JVM. All the application code is supposed to run in a single AppContext, including all the helper threads running native code. If you create a new thread group, it will inherit the current AppContext. If you create a new thread group using another (not current) thread group as a parent... Well, you should not do that, and, actually, untrusted code is not allowed to do that. But I can deploy trusted code by signing an applet or a webstart application and it can create a Thread in another ThreadGroup. Elsewhere in this thread people mention JNI and RMI threads and Cocoa's main thread. This is all valid code; there's no prohibitions against doing any of these things.
Even if an applet is signed and has all permissions, I don't think it should create new threads in, say, Java Plugin thread group, right? Note that AppContext is a little bit more complex than a plain Map <-> ThreadGroup mapping. A single AppContext can occupy multiple thread groups, so if you create a thread in a nested thread group, you will be fine.
RMI and other issues mentioned in this thread should be fixed, indeed.
I understand it is intended that this AppContext idea is transparent and ideally it would be. But at the present time it appears that the abstraction leaks [1] and there is no workarounds possible using supported code (rather than sun.* classes). Have I misunderstood something in this thread?
My feeling is this is something Oracle needs to address.
Agree.
Thanks,
Artem
[1] http://www.joelonsoftware.com/articles/LeakyAbstractions.html
AndyT (lordpixel - the cat who walks through walls) A little bigger on the inside (see you later space cowboy, you can't take the sky from me)
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