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I right clicked my web project and selected Project Properties. I clicked "sources" from the menu on the left, and changed it from 1.3 to 1.5 then pressed OK. I came back to the project properties window and noticed it had not saved. I checked the POM.XML and no changes.
most probably a duplicate of 166414, while a different ui, the same backend is used to store the changes in the pom.xml file. Please add more details to 166414 for us to reproduce. *** This issue has been marked as a duplicate of 166414 ***