Details
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Bug
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Status: Open
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Major
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Resolution: Unresolved
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9.0
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None
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None
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Windows 10 x64 (1709), JDK 10.0.2, Core i7 6700K, 16 GB RAM
Description
I have a rather large Java project with over 600 source files. It is a console application, no GUI code. At startup it loads a lot of data (among other things it memory-maps some files that are around ~500 MB). When left unconstrained, it uses around 1.1 GB of memory once it is done, but it also works fine with -Xmx768M. When not running under a debugger, it takes around 1 minute to complete loading.
When launching it using NetBeans' debugger, however, it never completes. It will load for around 5 minutes (at which point it still isn't even half done..), then CPU usage for the process goes to 0% and netbeans64 sits at 12.5% (seems like a single thread running a spin loop or so). I use the current release version of NetBeans 9 running under JDK 10.0.2.
Unfortunately I cannot disclose much more about the application's nature. The parts that seem to be especially slowed down under the debugger involve a lot of Nashorn activity. No breakpoints or watches are being used. The same thing happens when using JDK 8 as platform for the application. I also found that if I disable the parts that use Nashorn it does not freeze anymore in the subsequent loading steps.
When I was still using NetBeans 8.2 with JDK 8, it was fine. Debugging was only marginally slower than launching it without a debugger.