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

问题描述

我只想记录程序中异常的前几行.我知道，我可以做这样的事情来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 slf4j 而不是 log4j 更准确)进行日志记录.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

您可以在 log4j 中使用 EnhancedPatternLayout 来格式化堆栈跟踪.

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，特别是模式表中关于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} 的支持是相当新的，并且至少需要 log4j 1.2.16(在撰写本文时是最新的)

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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