message: remove useless maven properties
diff: <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <project.testresult.directory>${project.build.directory}/test-results</project.testresult.directory>
  <maven.build.timestamp.format>yyyyMMddHHmmss</maven.build.timestamp.format>
  - <maven.compiler.source>${java.version}</maven.compiler.source>
  - <maven.compiler.target>${java.version}</maven.compiler.target>
  - <maven.compiler.release>${java.version}</maven.compiler.release>
  <argLine>-Djava.security.egd=file:/dev/./urandom -Xmx256m</argLine>
  <m2e.apt.activation>jdt_apt</m2e.apt.activation>
  <run.addResources>false</run.addResources>
  <artifactId>maven-javadoc-plugin</artifactId>
  <version>${maven-javadoc-plugin.version}</version>
  <configuration>
  - <source>${maven.compiler.source}</source>
  + <source>${java.version}</source>
  </configuration>
  </plugin>
  <plugin>
  