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I have two Maven projects: The first defines an annotation , an annotation processor and a provider-configuration file to trigger the annotation processor through the ServiceLoader API. The other depends on the first and defines some classes and interfaces , and one of them is annotated with the annotation defined in the first project . I invoke the build of the second project (after having built and installed the first) with mvn clean && mvn compile , just to be sure that compilation will happen and that annotation processing will run. It works as expected: the simple annontation processor just generates a resource file in the target/classes/ directory containing some dummy data. When I tried to output some information using processingEnv.getMessager().printMessage(...) I started having some trouble. If I use Diagnostic.Kind.ERROR , the build stops and it prints the message, as I would expect. However, with any other Kind (such as NOTE or WARNING ), the message is not written on the screen ! Some information on my environment: Kubuntu 12.10 Linux 3.5.0-17-generic Apache Maven 3.0.4 (r1232337; 2012-01-17 06:44:56-0200) Java version: 1.7.0_09, vendor: Oracle Corporation I didn't explicitly declare the version of maven-compiler-plugin anywhere, so it must be using the default version (2.3.2? I'm not sure). How does one enable the output of all the Kind s of messages on this setup? (ie, launching the annontation processor through maven)

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