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javaeclipsespring-bootspring-tool-suite

How to fix Eclipse IDE Run Configuration (Problem occurred dialog)

I use Eclipse IDE(Spring Tool Suite) for many years, and periodically I have the same problem with the Launching project

The problem happens with the existing "Run Configuration" after time, maybe after the IDE update, but I unable to reproduce why this happens. To quick fix, I just remove "Run Configuration" with error, and just "mouse right-click on Application.java -> Run As -> Spring Boot App" and all work, but I need again add environment variables to this new configuration ... etc

I bored to have this problem for many years repeatedly from time to time. I think other Eclipse or Spring STS users have the same problem/experience.

Does anyone know how to fix this error? Except Delete and Create again "Run Configuration"...

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Problem Occurred

An internal error occurred during: "Launching Operational".
Cannot invoke "org.eclipse.jdt.core.IJavaProject.getProject()" because "project" is null

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An error has occurred. See error log for more details.
Cannot invoke "org.eclipse.jdt.core.IJavaProject.getProject()" because "project" is null
Solution
    1. Close Eclipse IDE
    2. Go to your workspace directory e.g: workspace/.metadata/.plugins/org.eclipse.debug.core/.launches (for linux I use command "locate .launch" to quick find)
    3. Find your broken Launching configuration in this directory, and open it with a text editor
    4. Check these two lines is exist, if not exist, you must add these two lines with your 'value="web"' module name. If you don't know the module name, just create a new "Run Configuration" and find differences with the previous "Run Configuration" in the .launch file
    <stringAttribute key="org.eclipse.jdt.launching.MODULE_NAME" value="web"/>
<stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="web"/>

    After all, Run Eclipse IDE