Java错误解决记录

• internal java compiler error
  检查以下配置
  1 查看项目的jdk
  File | Project Structure... | Project Settings | Project | Project SDK: Project language level:
  2 查看工程的jdk
  File | Project Structure... | Project Settings | Modules | 工程名称 | Sources | Language level:
  3 查看idea中Java配置
  Preferences | Build, Execution, Deployment | Compiler | Java Compiler | Target bytecode version
  如不起作用，清除IDEA缓存 重启IDEA
  File | Invalidate Caches/Restart...

• You aren‘t using a compiler supported by lombok, so lombok will not work and has been disabled.
Preferences | Build, Execution, Deployment | Compiler
  在User-local build process VM options (overrides Shared options):后面添加-Djps.track.ap.dependencies=false

• @Slf4j找不到log
  Preferences | Build, Execution, Deployment | Compiler | Annotation Processors
  勾选Enable annotation processing
  重启idea

• pom.xml不可用
  Preferences | Build, Execution, Deployment | Build Tools | Maven | Ignored Files
  取消选中对应项目的pom.xml

• JDK isn't specified for module '***'
  删除.idea然后刷新一下即可

• Error:(28, 5) java: No property named "**" exists in source parameter(s). Did you mean "null"?
  错误解释：该错误是使用mapstruct和lombok结合使用时产生的错误，mapstruct在生成转换代码时找不到属性
  错误分析：原因是因为在生成转换代码时lombok还没有生成setter、getter相应方法，所以找不到属性
  解决办法：在pom.xml中调整顺序lombok放在mapstruct前面编译

• Web server failed to start. Port 8080 was already in use.
  停掉占用端口的其他Web server，也可以使用下面方法
  Mac系统终端执行

# 查找8080端口占用pid
lsof -i tcp:8080
# `kill`掉
kill 6095

• Maven创建的Module不能使用依赖库
  IDEA -> Preferences... -> Build,... -> Maven -> Ignored Files -> 勾掉.../pom.xml

• main/java文件不能创建Java文件
  右击java -> Mark Directory as -> Sources Root
Process terminated
  在报错的左侧栏里点击项目名查看错误原因并解决
  解决：中文路径导致

• Error:(28,57) java: -source 1.5 中不支持 diamond 运算符
pom.xml中指定当前使用的jdk版本

<properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target> 
    <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
</properties>

• Mac系统idea集成Tomcat出错
  Error running 'Tomcat 9.0.34':Unable to open debugger port (127.0.0.1:xxxxx):java.net.SocketException "Socket closed"
  端口号被占用：调整端口号Startup/Connection -> Debug -> Port
  其他原因：Tomcat安装路径不对导致
  安装Tomcat：https://www.jianshu.com/p/67220b7a2579