java.lang.NoSuchMethodError when the method definitely exists

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The problem has now been resolved. Thank you everyone for your assistance.

It turns out that the main project had a dependency which had another MediaDao class, in exactly the same package path. Someone had basically copied the class into that dependency (as a library resource so that lots of projects could use it without specifying the main project as a dependency). However, that someone had not removed the class in the main project.

So, when I modified the class in the main project (I added the updateAlfrescoNodeRef method), and ran the application in STS on my machine, Tomcat used the version of the class in the main project, and not in the library because the library project was closed. When the application was deployed to the server however, it looks like the version of the class in the library was used instead (which, of course, didn’t have the updateAlfrescoNodeRef method in it).

Expert tip if you ever find yourself in a similar situation: In STS, press CTRL+SHIFT+T to open the “Open Type” dialog, and enter the name of the problematic class to see a list of projects that have a class with that name.

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