java 获取“ArrayIndexOutOfBoundsException：null”且没有堆栈跟踪
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Getting "ArrayIndexOutOfBoundsException: null" with NO stack trace
提问by Christoph
In our log files we find the following:
在我们的日志文件中，我们发现以下内容：
[2012-09-24 00:09:32.590 +0000UTC] ERROR host server1 [] [] somepackage.someclass [] [Unknown] [V3rAqPaDvvAAAAExEXhdWGyh] [pjsQwTGHzxcAAAE5j4YdGvWV] "ThreadName" Some error happened: java.lang.ArrayIndexOutOfBoundsException: null
There is only this single line, and NO exception stack trace.
只有这一行，没有异常堆栈跟踪。
The tryblock in which this exception happens is executing dynamically-generated Java byte-code which was created using javassist.
try发生此异常的块正在执行使用 javassist 创建的动态生成的 Java 字节码。
I am wondering about two things:
我想知道两件事：
- The
java.lang.ArrayIndexOutOfBoundsException: null - The missing stack-trace, despite calling the log hook using
logger.error("message", theException)inside thecatchblock, which ordinarily would lead to a full stack-trace being printed in the log-file.
- 该
java.lang.ArrayIndexOutOfBoundsException日期null - 丢失的堆栈跟踪，尽管
logger.error("message", theException)在catch块内调用了日志钩子，这通常会导致在日志文件中打印完整的堆栈跟踪。
My Questions:
我的问题：
What kind of code can cause a logging output "java.lang.ArrayIndexOutOfBoundsException: null". I try to reproduce this with a test program with no luck. I always get something like "java.lang.ArrayIndexOutOfBoundsException: Index: 3" or similar.
Could the reason for missingstack-trace, be that this code is dynamically generated at runtime, and as such the logger/JVM does not "know" the stack-trace or relevant line number(s)?
什么样的代码会导致日志输出“java.lang.ArrayIndexOutOfBoundsException: null”。我尝试用一个没有运气的测试程序来重现这个。我总是得到类似“java.lang.ArrayIndexOutOfBoundsException：Index：3”或类似的信息。
缺少堆栈跟踪的原因可能是该代码是在运行时动态生成的，因此记录器/JVM 不“知道”堆栈跟踪或相关行号？
We are currently debugging and investigating to get more info, but maybe this sounds familiar to somebody.
我们目前正在调试和调查以获取更多信息，但这对某些人来说可能听起来很熟悉。
回答by Frank Pavageau
Stringconcatenated with anullreference might get you such a message:Object obj = null; throw new ArrayIndexOutOfBoundsException("" + obj);If you're using an Oracle JVM you may want to add
-XX:-OmitStackTraceInFastThrowas an additional parameter to see if it helps. For some basic exceptions, the JVM reuses the same exception instance after a while, in which case there's no stack trace anymore. This option prevents the reuse, so you always get a stack trace.
String与null参考连接可能会给您这样的消息：Object obj = null; throw new ArrayIndexOutOfBoundsException("" + obj);如果您使用的是 Oracle JVM，您可能需要添加
-XX:-OmitStackTraceInFastThrow一个附加参数以查看它是否有帮助。对于一些基本的异常，JVM 会在一段时间后重用相同的异常实例，在这种情况下不再有堆栈跟踪。此选项可防止重用，因此您始终可以获得堆栈跟踪。
Edit note: this last could also apply to a recent version of OpenJDK (e.g., 1.8)
编辑说明：最后一个也适用于最新版本的 OpenJDK（例如，1.8）
回答by Volodymyr Kret
I found pretty much the same behavior with disappointing log as shown below:
我发现与令人失望的日志几乎相同的行为，如下所示：
java.lang.ArrayIndexOutOfBoundsException: null
In my case, the problem was in concurrent ArrayList.add calls (two separate threads added elements into shared unsynchronized list). The most interesting thing: firstArrayIndexOutOfBoundsException always had stacktrace and descriptive message, all futureArrayIndexOutOfBoundsExceptions were without stacktrace and message. Tried to reproduce on separate project with plain java threads - no luck (always got full stacktraces etc).
就我而言，问题出在并发 ArrayList.add 调用中（两个单独的线程将元素添加到共享的非同步列表中）。最有趣的事情：第一个ArrayIndexOutOfBoundsException 总是有堆栈跟踪和描述性消息，所有未来的ArrayIndexOutOfBoundsExceptions 都没有堆栈跟踪和消息。试图用普通的 java 线程在单独的项目上重现 - 没有运气（总是有完整的堆栈跟踪等）。
PS. OpenJDK 11, jetty server.
附注。OpenJDK 11，码头服务器。
