maven的complier預設是1.3

解決此問題，只需要在批Pom檔案指定complier的版本，比如1.6

<plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-compiler-plugin</artifactId>
      <version>3.1</version>
      <configuration>
          <compilerVersion>1.6</compilerVersion>
          <source>1.6</source>
          <target>1.6</target>
      </configuration>
 </plugin>