Log4j Java版本的堆栈跟踪每一行的末尾

Question

When I use log4j and do

log.error("Exception message", ex);

I see something like this

at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.ensureOpen(HttpURLConnection.java:3366) ~[?:1.8.0_171] at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3391) ~[?:1.8.0_171]

why do I see java version at the end of each line and how do I get rid of it? Some lines will also have other info, like a path from where the script started.

Answer 1

When using log4j, you provide a configuration that describes the "pattern" that describes how each "log message" will get formatted. Part of that pattern can control the format of the stack trace when a throwable is logged. If you don't provide an explicit format for a throwable, it will use the default one, which is adding the JVM version suffix, as per your example.

Here is a pattern layout which removes the default suffix.

 <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n %ex{suffix()}"/>

The details are available here - https://logging.apache.org/log4j/2.x/manual/layouts.html .