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<>问题描述：
在idea中创建一个Maven项目，运行项目时报：java: 错误: 不支持发行版本 5！
打开Project Structure ，查询Modules的项目jdk版本，发现项目中所有的模块的都变成了5了。
打开File -> Settings -> Buiild,Execution,Deployment -> Compiler -> java compiler
，版本也变成了5。
<>解决方法：
将这个两个地方jdk版本都修改成自己使用的版本，然后保存，就能正常使用了。
缺点：如果再创建一个项目的话，包括之前所有模块项目的jdk又会变成5了，还是会报这个错误，需要自己手动再修改一次。
<>永久解决方法：
修改Maven地址\conf\setting.xml中设置默认jdk版本
我是用的jdk版本是17，已jdk17为例，修改如下：
<profile> <id>development</id> <activation> <jdk>17</jdk> <activeByDefault>true
</activeByDefault> </activation> <properties> <maven.compiler.source>17</
maven.compiler.source> <maven.compiler.target>17</maven.compiler.target> <
maven.compiler.compilerVersion>17</maven.compiler.compilerVersion> </properties>
</profile>
设置完成后保存即可。
<>测试验证：
再次新建Maven项目，项目会默认使用jdk17版本，不用修改即可编译运行成功。
