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jni-maven-example

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A JNI Example with Maven

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Build and Install
-------------------------------------------------------
### Prerequisites:
- Required operating systems:
  * Ubuntu\* Desktop-16.04-LTS 64bits

- Use the following command to install the required tools:  
```
    $ sudo apt-get install maven
```
- Download oracle Java JDK "jdk-8u144-linux-x64.tar.gz" from http://www.oracle.com/technetwork/java/javase/downloads,
  and extract to directory /usr/lib/jvm/
```
    $ sudo tar -xvzf jdk-8u144-linux-x64.tar.gz -C /usr/lib/jvm/
```

- Update environment variables
```
    $ export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_144
    $ export CLASSPATH=$JAVA_HOME/lib:$CLASSPATH
    $ export PATH=$JAVA_HOME/bin:$PATH
    $ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${Project_basedir}/native/src/main/cpp/lib
```

- Add dynamic linker for run-time bindings if you have some custom libraries for native codes.
  Assume you install your libraries under "${Project_basedir}/native/src/main/cpp/lib", please
  save the settings below as "jnidemo.conf" under /etc/ld.so.conf.d/
```
    ${Project_basedir}/native/src/main/cpp/lib
```

- Update ldconfig
```
    $ sudo ldconfig
```

### Compile
- To compile, enter the following command:  
```
    $ mvn compile  
```

- The build above would download a lot of dependent libraries. If you get the time-out warnings/errors,
  please save this proxy settings as "settings.xml" under ${HOME}/.m2/
```
    <settings>
      <proxies>
       <proxy>
          <id>httpsproxy</id>
          <active>true</active>
          <protocol>https</protocol>
          <host>${host_url}</host>
          <port>${host_port}</port>
          <nonProxyHosts>www.google.com|*.example.com</nonProxyHosts>
        </proxy>
      </proxies>
    </settings>
```

### Test
- To Test, enter the following command:
```
    $ mvn test
```

- If succeed, You can find the report as below in the debugging logs:
```
    -------------------------------------------------------
    T E S T S
    -------------------------------------------------------
    Running com.github.projects.demoproc.DemoProcTest
    Hello World!

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.056 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

```

### Build package and install
- To build package, enter the following command:
```
    $ mvn package
```

- If succeed, You can find the file "demoproc-jni-1.0-jar-with-dependencies.jar" located under ${Project_basedir}/jni/target:

- To install into your local repository:
```
    $ mvn install:install-file -Dfile=demoproc-jni-1.0-jar-with-dependencies.jar -DgroupId=com.github.projects 
          -DartifactId=demoproc-jni -Dversion=1.0 -Dpackaging=jar
```

### Run as a background process
```
    $ nohup mvn exec:java &
```

### Clean
- If you want to clean the files generated by previous `mvn compile` command, enter the following command:
```
    $ mvn clean
```

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