22 lines
996 B
Markdown
22 lines
996 B
Markdown
* Dependency the toolkit, such as using maven or gradle
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```xml
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<dependency>
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<groupId>org.apache.skywalking</groupId>
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<artifactId>apm-toolkit-log4j-1.x</artifactId>
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<version>{project.release.version}</version>
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</dependency>
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```
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[  ](https://bintray.com/wu-sheng/skywalking/org.apache.skywalking.apmg-toolkit-log4j-1.x/_latestVersion)
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* Config a layout
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```properties
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log4j.appender.CONSOLE.layout=TraceIdPatternLayout
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```
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* set `%T` in `layout.ConversionPattern` ( In 2.0-2016, you should use %x, [Why change?](https://github.com/wu-sheng/sky-walking/issues/77) )
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```properties
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log4j.appender.CONSOLE.layout.ConversionPattern=%d [%T] %-5p %c{1}:%L - %m%n
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```
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* When you use `-javaagent` to active the sky-waking tracer, log4j will output **traceId**, if it existed. If the tracer is inactive, the output will be `TID: N/A`.
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