The maven aggregation parent-child project created by eclipse. The parent project cannot create a new java.

recently imported a maven project, and there are 4 sub-maven projects below. It is found that the java file in the child maven project cannot automatically depend on the java class of the parent maven project.
I thought to myself to build a new father-son maven project and compare it.
then creates a new multi-module aggregated maven project using eclipse. Parent project: top, child module:module1. If you find that you can"t create new package and java files in the top project, prompt: is not a java project.

but idea is fine. I don"t know why.

Java eclipse
Aug.14,2021

use the eclipse project to create a new parent-son maven project, and the parent project is not a java project (. It's my fault that I checked Create a simple project (skip archtype selection)) when I created the parent project. You need to set it to a java project first. And then rely on it in the sub-project.
specific steps:

  • right-click the parent project and select properties- > Project Facets. Convert whatever, select the check box of java to make sure this project becomes java project.
  • right-click sub-project Build Path- > Configure build path. Switch to projects, and enter the parent project add into OK.

Previous: What is the difference between ArcGIS for JavaScript and Baidu map Amap?

Next: Questions about how to write in the source code of vue

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1beb019-31295.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1beb019-31295.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?