A 3rd party jar is one which is not present as a bundle in AEM OSgI. If you want to use API’s from a 3rd party jar in AEM then it needs to be added to AEM OSGI.
If you try to upload a 3rd party jar in osgi then it won’t, get uploaded. To upload it in osgi it needs to be osgi specific with MANIFEST.MF file. OSGI bundle is nothing but jar with MANIFEST.mf file.
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