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Sometimes, when I start Eclipse (Java EE IDE for Web Developers, Indigo SR 1) on my MacOSX Lion, my GWT (2.4.0) project initially fails to compile.
Eclipse displays the following message in the "Problems" section:
The project XXX does not have any GWT SDKs on its build path Here is a list of semi-solutions that sometimes work (I normally try them in this order):
Project > Clean.Any help with preventing the problem from re-occurring would be most welcome.
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It looks like you did not add Eclipse project metadata files to your source control system, so Eclipse doesn't know what your build path is or whether it is even a java project.
Procedure. In Eclipse select the web project and right-click Build Path > Configure Build Path. This will display the Java Build Path window.
Build path is used by the compiler to resolve dependencies and build a project. Classpath is used during runtime when running a project in order to find necessary dependencies. Build path is configured on the Java Build Path property page of a project.
I encountered the same problems as described above. But none of the solutions worked.
What did work was moving the GWT SDK above the other GWT dependencies in the build path. See the following blog (written by my personal hero of the day): Grant Little's Blog
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I believe the problem was occurring because Eclipse had some stale settings about available/linked GWTs.
Therefore, building on the answer by Chris Cashwell, I recommend the following:
Project>Properties>Google>Web Toolkit>Configure SDKs, .EDIT: Sometimes, I still need to do a Project > Clean, but this is rare now.
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