Log4j格式化：是否可以截断堆栈跟踪？ [英] Log4j formatting: Is it possible to truncate stacktraces?

问题描述

我想在我的程序中只记录Exceptions的前几行。我知道，我可以做这样的事情只打印堆栈跟踪的前5行：

I want to log only the first few lines of Exceptions in my program. I know, I can do something like this to print only the first 5 lines of a stacktrace:

Throwable e = ...;
StackTraceElement[] stack = e.getStackTrace();
int maxLines = (stack.length > 4) ? 5 : stack.length;
for (int n = 0; n < maxLines; n++) {
    System.err.println(stack[n].toString());
}

但我宁愿使用log4j（或者更好地使用log4j上的slf4j）用于记录。有没有办法告诉log4j它应该只打印堆栈跟踪的前5行？

But I would rather use log4j (or slf4j over log4j to be more precise) for logging. Is there a way to tell log4j that it should only print the first 5 lines of a stacktrace?

推荐答案

你可以使用EnhancedPatternLayout在log4j中格式化堆栈跟踪。

You can use a EnhancedPatternLayout in log4j to format your stacktraces.

参见 http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/EnhancedPatternLayout.html ，特别是关于模式表中throwable模式的部分。

See http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/EnhancedPatternLayout.html, specifically the section about the "throwable" pattern in the pattern table.

请注意，对％throwable {n} 支持的支持相当新，至少需要log4j 1.2.16（这是撰写时的最新信息）

Note that support for the %throwable{n} support is rather new and requires at least log4j 1.2.16 (which is the latest at time of writing)

出于跟踪目的，这是处理其实施的票证：
https://issues.apache.org/bugzilla/show_bug.cgi?id=48902

For tracking purposes, this is the ticket that dealt with its implementation: https://issues.apache.org/bugzilla/show_bug.cgi?id=48902

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