An error is reported after eclipse changes the JDK version

In the actual development process, we may need to change the JDK version due to the needs of the project. However, an error will be reported after replacement, as follows:

Java compiler level does not match the version of the installed Java project facet.


Step 1: set the eclipse JDK version

Windows—-> Preferences—-> Java—-> Installed JREs


Step 2: set the JDK compiled version

Windows—-> Preferences—-> Java—-> Compiler


Step 3: right click the project and set the JDK version of the project to the above unified version

Right click the item – > Properties—-> Java Compiler


  Note: the above versions should be unified


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