Java 您如何将完整的堆栈跟踪写入日志？
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How do you write a full stack trace to the log?
提问by Linc
I was catching an exception and trying to write the stack trace to the logs like this:
我正在捕获异常并尝试将堆栈跟踪写入日志，如下所示：
log.warn(e.getMessage());
But all it said was
但它所说的只是
null
So I changed it to
所以我把它改成
log.warn(e.toString());
And now it says only
现在它只说
java.lang.NullPointerException
How do I write the full stack trace to the log so I can see where this Exception is being generated in the app?
如何将完整的堆栈跟踪写入日志，以便我可以看到在应用程序中生成此异常的位置？
采纳答案by Peter ?tibrany
Usually:
通常：
log.warn("message", e);
But it depends on your logging framework too.
但这也取决于您的日志记录框架。
回答by Colin Hebert
You can use
您可以使用
logger.log(Level.WARN, "logged exception", ex);
or
或者
logger.warn("logged exception", ex);
Resources :
资源 ：
回答by Noel M
In your exception method, the underlying Stringwhich contains the message is null.
在您的异常方法中，String包含消息的底层是null.
The above answer, now struck out, still holds, except that eis not null, but the detailMessageprivate instance variable on the Throwableclass is null, which is why e.getMessage()is the String null, but e.toString()(which calls underlying nulldetailMessage.toString) throws a NullPointerException.
上面的答案，现在被剔除，仍然成立，除了它e不是 null，但是类上的detailMessage私有实例变量Throwable是 null，这就是e.getMessage()String 的原因null，但是e.toString()（调用基础nulldetailMessage.toString）抛出一个NullPointerException.
回答by Joseph Rajeev Motha
Using log4j this is done with:
使用 log4j，这是通过以下方式完成的：
logger.error("An error occurred", exception);
The first argument is a message to be displayed, the second is the exception (throwable) whose stacktrace is logged.
第一个参数是要显示的消息，第二个参数是记录堆栈跟踪的异常（可抛出）。
Another option is commons-logging, where it's the same:
另一种选择是 commons-logging，它是相同的：
log.error("Message", exception);
With java.util.logging this can be done via:
使用 java.util.logging 这可以通过以下方式完成：
logger.log(Level.SEVERE, "Message", exception);
回答by nishant
If you using Java 8 you can do the following:
如果您使用 Java 8，您可以执行以下操作：
LOGGER.error("Caught exception while methodX. Please investigate: "
+ exception
+ Arrays.asList(exception.getStackTrace())
.stream()
.map(Objects::toString)
.collect(Collectors.joining("\n"))
);
回答by RafaJR
If you are using a Java version previous to 8, you can try this:
如果你使用的是 8 之前的 Java 版本，你可以试试这个：
LOGGER.error("Error al recuperar proveedores de la base de datos: " +
e + Arrays.asList(e.getStackTrace()).stream().map(new Function(){
@Override
public Object apply(Object t) {
return t.toString();
}
}).collect(Collectors.joining("\n")));
