Juergen Hoeller opened SPR-13228 and commented

Objenesis 2.2 is about to be released and will introduce support for Google App Engine.

Issue Links:

• Upgrade to Objenesis 2.4 [SPR-14292] #18864 Upgrade to Objenesis 2.4
• Upgrade to Objenesis 2.5 [SPR-15146] #19712 Upgrade to Objenesis 2.5

Referenced from: commits 4dd6b78