解决IDEA自动重置Project Language Level为1.6

IDEA 导入的 Maven 项目默认的 LanguageLeve l和 JavaCompiler 都是1.5，解决办法是在pom.xml中指定maven-compiler-plugin的版本

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

reference:

• stop intellij idea to switch java language level everytime the pom is reloaded (or change the default project language level)