IntelliJ IDEA generating serialVersionUID

Without any plugins: You just need to enable highlight in IntelliJ:

IntelliJ Preferences -> Editor -> Inspections -> Java -> Serialization issues -> Serializable class without 'serialVersionUID' - set flag and click 'OK'.

Now, if your class implements Serializable, you will see highlight, and alt+Enter on class name will propose to generate private static final long serialVersionUID.

PS: Taken from here

Install the GenerateSerialVersionUID plugin by Olivier Descout.

Go to: menu File → Settings → Plugins → Browse repositories → GenerateSerialVersionUID

Install the plugin and restart.

Now you can generate the id from menu Code → Generate → serialVersionUID` or the shortcut.

I am not sure if you have an old version of IntelliJ IDEA, but if I go to menu File → Settings... → Inspections → Serialization issues → Serializable class without 'serialVersionUID'` enabled, the class you provide give me warnings.

If I try the first class I see:

BTW: It didn't show me a warning until I added { } to the end of each class to fix the compile error.