Place the .class folder in a subdirectory of your project with the correct package structure. Refresh the project so that eclipse picks up the new directory.

I have installed jd-eclipse as described in the installation instructions here on Github. I have verified that the file associations are set so that .class files are opened with the JD Class File ...

Jars of org.eclipse.parsson:jakarta.json are compiled for Java version 8 (class version 52). However, the package-info.class files inside versions 1.0.1, 1.0.2, and 1.1.1 are actually compiled for ...