skywalking-java/docs/en/setup/service-agent/java-agent/Application-toolkit-log4j-1...

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* Dependency the toolkit, such as using maven or gradle
```xml
<dependency>
<groupId>org.apache.skywalking</groupId>
<artifactId>apm-toolkit-log4j-1.x</artifactId>
<version>{project.release.version}</version>
</dependency>
```
# Print trace ID in your logs
* Config a layout
```properties
log4j.appender.CONSOLE.layout=TraceIdPatternLayout
```
* set `%T` in `layout.ConversionPattern` ( In 2.0-2016, you should use %x, [Why change?](https://github.com/wu-sheng/sky-walking/issues/77) )
```properties
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%T] %-5p %c{1}:%L - %m%n
```
* When you use `-javaagent` to active the sky-walking tracer, log4j will output **traceId**, if it existed. If the tracer is inactive, the output will be `TID: N/A`.
# gRPC reporter
The gRPC report could forward the collected logs to SkyWalking OAP server, or [SkyWalking Satellite sidecar](https://github.com/apache/skywalking-satellite). Trace id, segment id, and span id will attach to logs automatically. You don't need to change the layout.
* Add `GRPCLogClientAppender` in log4j.properties
```properties
log4j.rootLogger=INFO,CustomAppender
log4j.appender.CustomAppender=org.apache.skywalking.apm.toolkit.log.log4j.v1.x.log.GRPCLogClientAppender
```
* Add config of the plugin or use default
```properties
plugin.toolkit.log.grpc.reporter.server_host=${SW_GRPC_LOG_SERVER_HOST:127.0.0.1}
plugin.toolkit.log.grpc.reporter.server_port=${SW_GRPC_LOG_SERVER_PORT:11800}
plugin.toolkit.log.grpc.reporter.max_message_size=${SW_GRPC_LOG_MAX_MESSAGE_SIZE:10485760}
plugin.toolkit.log.grpc.reporter.upstream_timeout=${SW_GRPC_LOG_GRPC_UPSTREAM_TIMEOUT:30}
```