skywalking-java/docs/en/How-to-build.md

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# How to build project
This document helps people to compile and build the project in your maven and set your IDE.
## Build Project
**Because we are using Git submodule, we recommend don't use `GitHub` tag or release page to download source codes for compiling.**
### Build from GitHub
1. Prepare git, JDK8 and maven3
1. `git clone https://github.com/apache/incubator-skywalking.git`
1. `cd incubator-skywalking/`
1. Switch to the tag by using `git checkout [tagname]` (Optional, switch if want to build a release from source codes)
1. `git submodule init`
1. `git submodule update`
1. Run `mvn clean package -DskipTests`
1. All packages are in `/dist`.(.tar.gz for Linux and .zip for Windows).
### Build from Apache source codes
1. Prepare JDK8 and maven3
1. Run `mvn clean package -DskipTests`
1. All packages are in `/dist`.(.tar.gz for Linux and .zip for Windows).
## Setup your IntelliJ IDEA
1. Import the project as a maven project
1. Run `mvn compile -Dmaven.test.skip=true` to compile project and generate source codes. Because we use gRPC and protobuf.
1. Set **Generated Source Codes** folders.
* `grpc-java` and `java` folders in **apm-protocol/apm-network/target/generated-sources/protobuf**
* `grpc-java` and `java` folders in **apm-collector/apm-collector-remote/apm-remote-grpc-provider/target/protobuf**
## Building Resin-3, Resin-4, and OJDBC sdk plugins
Due to license incompatibilities/restrictions these plugins under `apm-sniffer/apm-sdk-plugin/` are not built by default.
Download them manually into the `ci-dependencies/` directory and the plugins will be included in the maven reactor and built.
The names of the artifacts downloaded and placed in the `ci-dependencies/` directory must be exact:
* resin-3.0.9.jar
* resin-4.0.41.jar
* ojdbc14-10.2.0.4.0.jar