Tuesday, February 24, 2015

GWT & Dagger 2

Hi all,

I've been trying Dagger 2 with GWT and have been fighting to get things working. Could someone help?

My pom:



<extraJvmArgs>-Xmx2048M -XX:MaxPermSize=128M</extraJvmArgs>

My issues are:

#1 generated sources aren't available for gwt compilation

mvn compile

no errors are found in the compilation phase, dagger 2 generated sources land in target/generated-sources/annotations/

However running:

mvn compile gwt:compile

GWT compilation outputs the following error:

[ERROR] Errors in 'file:/path/to/project/src/main/java/path/to/project/client/ProjectEntryPoint.java'
[INFO] [ERROR] Line 79: No source code is available for type path.to.project.client.Dagger_ProjectComponent; did you forget to inherit a required module?
[INFO] [ERROR] Hint: Check the inheritance chain from your module; it may not be inheriting a required module or a module may not be adding its source path entries properly

the problem seems related with the fact that GWT compilation isn't including the generated sources, as target/generated-sources/annotations/ isn't included in the classpath of the GWT compiler. The project class paths that are included in GWT compile command are:

#2 Eclipse "doesn't follow" Dagger 2 generate sources (not related with GWT per-si)
I configured Eclipse (Luna edition) with m2e-apt plugin (http://marketplace.eclipse.org/content/m2e-apt). My project works as a maven project in Eclipse.

However when I change something in dagger (Component, Module, etc.) the generated sources aren't immediately generated, I need to do "Maven > Update Project".

#3 Eclipse imports errors on Dagger 2 generated files open (not related with GWT per-si)
When I open a file that was generated by dagger 2 (in target/generated/sources/annotations) eclipse doesn't know how to import other sources from target/generated/sources/annotations which lead to several compile time errors in those generated files. Additionally, from that point on Eclipse confuses himself and makes the project source files (in src/main/java) that are referring to generated dagger files (e.g. Dagger_ProjectComponent) to also be in error (eclipse doesn't know anymore to import those symbols).

To overcome this I have to do "Maven > Update Project". Note, however, that every time I open a dagger2 generated file, this happens again.

Has someone succeeded getting dagger 2 and GWT (and Eclipse) working together smoothly?

Also, any help to overcome the reported issues would be great (specially issue #1).

Thank you,

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