Tycho cannot resolve dependency configured in tycho-surefire-plugin

Question

I'm working on an Eclipse RCP + Maven project for the first time and I want to run some unit tests on my bundles with JUnit. It seems that the most recommended approach is to create a bundle fragment and use something like Tycho plugin to resolve dependencies. However, when I run mvn clean verify in my master pom, it should run the tests and deploy my application, but I'm get the following error instead:

[ERROR] Cannot resolve project dependencies:
[ERROR]   You requested to install 'myproject.app.feature.feature.group 1.0.0' but it could not be found
[ERROR] Failed to execute goal org.eclipse.tycho:tycho-surefire-plugin:0.21.0:test (default-test) on project myproject.app.viewmanager-test: Execution default-test of goal org.eclipse.tycho:tycho-surefire-plugin:0.21.0:test failed: No solution found because the problem is unsatisfiable.: [Unable to satisfy dependency from tycho-extra-1408913392535 0.0.0.1408913392535 to myproject.app.feature.feature.group 1.0.0.; Unable to satisfy dependency from tycho-1408913392552 0.0.0.1408913392552 to myproject.app.feature.feature.group 1.0.0.; No solution found because the problem is unsatisfiable.] -> [Help 1]

I understand that Maven is failing to find 'myproject.app.feature.feature.group 1.0.0' but I don't know where it is getting this from because it seems that the name is wrong.

It might be worth to say that when I run the unit test inside Eclipse (not with Maven) it works.

This is the Tycho configuration in my test fragment:

<plugin>
    <groupId>org.eclipse.tycho</groupId>
    <artifactId>tycho-surefire-plugin</artifactId>
    <version>${tycho-version}</version>
    <configuration>
        <useUIHarness>true</useUIHarness>

        <dependencies>
            <dependency>
                <type>eclipse-feature</type>
                <artifactId>myproject.app.feature</artifactId>
                <version>1.0.0</version>
            </dependency>
        </dependencies>

    </configuration>
</plugin>

As suggested here, I'm adding the feature as a dependency because my test fragment requires some other bundles besides its host, so I was expecting this to work.

Any tips? The most similar issue I have found is this one, but both solutions didn't work for me.

Answer 1

Starting with Tycho 0.21.0, there is only limited support for declaring dependencies to reactor projects in the tycho-surefire-plugin: They only work if the test project already has some other dependency to the referenced reactor project. In your use case, where you add a dependency to a feature, this is not the case.

You could make the tycho-surefire-plugin dependencies configuration work again by adding a POM dependency to the feature project:

<dependencies>
   <dependency>
      <!-- Maven GAV of the feature project -->
      <groupId>myproject.groupId</groupId>
      <artifactId>myproject.app.feature</artifactId>
      <version>1.0.0-SNAPSHOT</version>
   </dependency>
</dependencies>

<build>
   <plugins>
      <plugin>
         <groupId>org.eclipse.tycho</groupId>
         <artifactId>tycho-surefire-plugin</artifactId>
         <version>${tycho-version}</version>
         <configuration>
            <dependencies>
               <dependency>
                  <type>eclipse-feature</type>
                  <artifactId>myproject.app.feature</artifactId>
                  <version>1.0.0</version>
               </dependency>
            </dependencies>
         </configuration>
      </plugin>
   </plugins>
</build>

However the recommended way to specify extra test dependencies is to do this in the target-platform-configuration instead of on the tycho-surefire-plugin:

<plugin>
   <groupId>org.eclipse.tycho</groupId>
   <artifactId>target-platform-configuration</artifactId>
   <configuration>
      <dependency-resolution>
         <extraRequirements>
            <requirement>
               <type>eclipse-feature</type>
               <id>myproject.app.feature</id>
               <versionRange>1.0.0</versionRange>
            </requirement>
         </extraRequirements>
      </dependency-resolution>
   </configuration>
</plugin>

Note: The element names to specify dependencies are different in the target-platform-configuration compared to the tycho-surefire-plugin. So when migrating your configuration, you need to adapt the tag names:

• <type> (unchanged)
• <artifactId> → <id>
• <version> → <versionRange>

Remark: Although the tag names are different, the semantics of the elements are the same: So even though the old name was <version>, the value was always interpreted as a version range. A version range that consists of a single version like 1.0.0 stands for for a version range without upper bound, i.e. version 1.0.0 or later.

Answer 2

I just had essentially the same problem. It seems that with tycho 0.21 dependencies have to be added using the target-platform-configuration plugin. See tycho bug 436617 comment #11 for an example.