How to organize my Eclipse GWT project for Java 7?

For the backend (services) I would like to use Java 7 and the new language features. For the frontend this is impossible, because the GWT compiler is unable to parse Java 7 language constructs at this point. So I would like to setup two Eclipse projects: 开发者_C百科One for the frondend with Java 6 and one for the backend with Java 7. Any idea how to do the build (no Ant, just in Eclipse) and manage the dependencies?

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I think you would like three projects.

1: The frontend project which uses GWT to compile code to Javascript. This should use Java 6.

2: The backend project, which is pure Java and can use Java 7.

But, they will need to share some code (async interfaces, data structures, etc). Therefore you need a third project:

3: Shared project which contains shared code. This should also use Java 6 and GWT and should define a GWT module. The frontend project can therefore reference this project as a GWT module and that should cause the shared code to be compiled to Javascript.

The backend project should be able to reference this project even though it is Java 6.

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Isn't it enough simply don't use java 7 features on your client and shared packages? I don't think you need two projects

I think GWT can run fine over a Java 7 VM, and the GWT compiler don't care about your server package

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You should be able to set the project's Java in the project settings. Select the project in Eclipse, then select Project > Properties. Java Build Path > Add Library. You can Add/Remove the JRE you want. After those changes, make sure that the settings under Java Compiler look right too.