skywalking-java/docs/en/setup/service-agent/java-agent/Setting-override.md

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# Setting Override
In default, SkyWalking provide `agent.config` for agent
Setting override means end user can override the settings in these config file, through using system properties.
Use `skywalking.` + key in config file as system properties key, to override the value.
- Why need this prefix?
The agent system properites and env share with target application, this prefix can avoid variable conflict.
- Override priority
System.Properties(-D) > Config file
- Example
Override `agent.application_code` by this.
```
-Dskywalking.agent.application_code=31200
```