Java中没有StackTrace的NullPointerException [英] NullPointerException in Java with no StackTrace

问题描述

我有Java代码的实例捕获 NullPointerException ，但是当我尝试记录StackTrace时（基本上最终调用 Throwable .printStackTrace（）），我得到的是：

  java.lang.NullPointerException 
  

有没有其他人遇到这个？我试着谷歌搜索java空指针空堆栈跟踪但没有遇到这样的事情。

解决方案

你可能使用Sun JVM，它执行大量优化。要获得堆栈跟踪，您需要将选项 -XX：-OmitStackTraceInFastThrow 传递给JVM。

现代OpenJDK JVM（1.8及更高版本？）似乎也接受 -XX：-OmitStackTraceInFastThrow 标志（默认情况下也启用了堆栈跟踪优化）。 / p>

I've had instances of our Java code catch a NullPointerException, but when I try to log the StackTrace (which basically ends up calling Throwable.printStackTrace() ), all I get is:

java.lang.NullPointerException

Has anyone else come across this? I tried googling for "java null pointer empty stack trace" but didn't come across anything like this.

解决方案

You are probably using the Sun JVM, which performs a lot of optimization. To get the stack traces back, you need to pass the option -XX:-OmitStackTraceInFastThrow to the JVM.

Modern OpenJDK JVMs (1.8 and higher?) seem to accept the -XX:-OmitStackTraceInFastThrow flag as well (and have stack-trace optimization turned on by default) as well.

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