Java应用程序在Eclipse中运行，随机出现“致命错误”

Question

I have written a short application that converts files from their raw data to XML (ECGs). I have about 350000 files to convert, and the convertion itself is done via a library that I got from the manufacturer of the ECG devices. To make use of multiple processors and cores in the machine I'm using to do the convertion I wrote a "wrapper application" that creates a pool of threads, which is then used to do the convertion in separate threads. It works somewhat ok, but unfortunately I do get random errors causing the whole application to stop (85k files have been converted over the past 3-4 days and I have had four of those errors):

A fatal error has been detected by the Java Runtime Environment:

EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x71160a6c, pid=1468, tid=1396

JRE version: Java(TM) SE Runtime Environment (8.0_20-b26) (build 1.8.0_20-b26)
Java VM: Java HotSpot(TM) Client VM (25.20-b23 mixed mode windows-x86 )
Problematic frame:
C  [msvcr100.dll+0x10a6c]

I would suspect that it's the library that I'm using that causes these, so I don't think I can do all that much to fix it. If that error happens, I run then program and let it start where it left off before crashing. Right now I have to do that manually but was hoping that there is some way to let Eclipse restart the program (with an argument of the filename where it should start). Does anyone know if there is some way to do that?

Thanks!

Answer 1

It is not entirely clear, but I think you are saying that you have a 3rd party Java library (with a native code component) that you are running within one JVM using multiple threads.

If so, I suspect that the problem is that the native part of the 3rd-party application is not properly multi-threaded, and that is the root cause of the crashes. (I don't expect that you want to track down the cause of the problem ...)

Instead of using one JVM with multiple converter threads, use multiple JVMs each with a single converter thread. You can spread the conversions across the JVMs either by partitioning the work statically, or by some form of queueing mechanism.

Or ... you could modify your existing wrapper so that the threads launched the converter in a separate JVMs using ProcessBuilder. If a converter JVM crashes, the wrapper thread that launched it could just launch it again. Alternatively, it could just make a note of the failed conversion and move onto the next one. (You need to be a bit careful with retrying, in case it is something about the file that you are converting that is triggering the JVM crash.)

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For the record, I don't know of an existing "off the shelf" solution.

Answer 2

It seems that you are using the x86 (32-bit) version of Java. Maybe you could try it with the x64 (64-bit) version. That has sometimes worked for me in the past.

The problem seems to be in the native library, but maybe if you try it with 64-bit Java, it will use a 64-bit version of the native library?