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Bug 256713 - Netbeans deadlocks if proxy server requires authentication
Summary: Netbeans deadlocks if proxy server requires authentication
Status: RESOLVED DUPLICATE of bug 248308
Alias: None
Product: platform
Classification: Unclassified
Component: Autoupdate (show other bugs)
Version: 8.1
Hardware: PC Windows 7
: P2 normal with 5 votes (vote)
Assignee: Libor Fischmeistr
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-11-20 14:49 UTC by fvogler
Modified: 2017-11-16 22:02 UTC (History)
4 users (show)

See Also:
Issue Type: DEFECT
Exception Reporter:

Attachments
Threaddump containing deadlock (37.72 KB, application/octet-stream)
2015-11-20 14:49 UTC, fvogler 		Details
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Description fvogler 2015-11-20 14:49:51 UTC 
Created attachment 157433 [details]
Threaddump containing deadlock

Hi,

netbeans deadlocks if it is used behind a proxy server which requires authentication. This happens e.g. at startup while the autoupdate feature tries to connect and the proxy server asks for authentication. The network stack tries to show a dialog while holding the SystemClassLoader lock. The EventQueue now blocks on SystemClassLoader.getResourcesImpl handling the "show dialog request".
Comment 1 frankv 2015-12-01 20:37:16 UTC 
There is a workaround, although it's horrible & incomplete: Disconnect the workstation from the network whilst starting the IDE. Once it has started up, plug the network back in, and immediately *change* the proxy settings via Tools/Options.

It's incomplete because this doesn't stop the IDE from locking up again some time in the future... save your source code changes early and often.
Comment 2 jurkasm 2016-05-10 08:39:10 UTC 
Strange thing that Netbeans freeze on Autoupdate, but when I test proxy or use Check for Updates it works. And then it freezes again during loading Angular docs and so again. For me Netbeans is now useless, I can start it without network, but during work I need connection.
Comment 3 DefaultLocale 2017-01-19 05:32:23 UTC 
Same thing happened to me after an upgrade to 8.2. The previous version was running on JDK7 and didn't have this problem.

I used CNTLM as a workaround. This way I don't need to set proxy authentication through Netbeans. 

This issue is particularly annoying because it takes a lot of time to find a root cause. Without threaddump there is no way to tell that problem has something to do with proxy settings. Netbeans just fails randomly.
Comment 4 Tappe 2017-05-31 11:57:35 UTC 
This seems to be the same bug as 248308 and 262883, unfixed since 2014.
Only workaround seems to be to use a local proxy.
The cause of the bug is a bug in Java, which doesn't seem to get fixed unfortunately. (see 248308)
Comment 5 frankv 2017-11-16 21:58:32 UTC 
This has recurred for me with NB v8.2 and Java 1.8.152. I think it was the Java version update which re-introduced the problem... I have been using NB 8.2 for some time. However, neither of my workarounds seemed to work. :(

Following from Tappe's comment, I disabled Java's automatic update checking. That seemed to get NB working again.
Comment 6 frankv 2017-11-16 22:02:08 UTC 

*** This bug has been marked as a duplicate of bug 248308 ***