Dynamic Extensions Gradle plugin fails with java.lang.NoClassDefFoundError: aQute/bnd/osgi/Builder

[vierbergenlars]

Using the dynamic extensions gradle plugin fails while running the jar task with a NoClassDefFoundError for aQute.bnd.osgi.Builder.

I'm submitting a ... (check one with "x")

[x] bug report
[ ] feature request
[ ] question

Expected Behavior

Running the jar task creates a dynamic extensions jar.

Current Behavior

Running the jar task fails with an exception

> Task :jar FAILED
Caching disabled for task ':jar' because:
  Build cache is disabled
Task ':jar' is not up-to-date because:
  No history is available.
:jar (Thread[main,5,main]) completed. Took 0.043 secs.
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':jar'.
> aQute/bnd/osgi/Builder
* Try:
Run with --debug option to get more log output. Run with --scan to get full insights.
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':jar'.
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:151)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$3.accept(ExecuteActionsTaskExecuter.java:148)
	at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:191)
[...]
Caused by: java.lang.NoClassDefFoundError: aQute/bnd/osgi/Builder
	at aQute.bnd.gradle.BundleTaskConvention$_buildBundle_closure5.doCall(BundleTaskConvention.groovy:199)
	at org.gradle.util.ClosureBackedAction.execute(ClosureBackedAction.java:70)
[...]
Caused by: java.lang.ClassNotFoundException: aQute.bnd.osgi.Builder
	... 172 more
* Get more help at https://help.gradle.org
BUILD FAILED in 2m 25s
3 actionable tasks: 3 executed
The command "./gradlew assemble -i --stacktrace" failed and exited with 1 during .

Steps to Reproduce (for bugs)

1. Apply the eu.xenit.de gradle plugin (make sure the mavenCentral or jcenter repositories are not used for plugin resolution)
2. Run ./gradlew assemble

Context

Building the example project fails on travis: https://travis-ci.org/xenit-eu/example-dynamic-extension/builds/535161122

Your Environment

• Dynamic Extensions Gradle plugin version 2.0.0

[vierbergenlars]

This issue is caused by a bug in the publish process of the bnd plugin that is used under the covers: bndtools/bnd#3174

You can work around it by adding this snippet to settings.gradle

pluginManagement {
    repositories {
        mavenCentral()
        gradlePluginPortal()
    }
}

Or by adding this snippet to your build.gradle

buildscript {
    repositories {
        mavenCentral()
    }
}

[vierbergenlars]

To work around it from the plugin side, we can

1. Add all the dependencies of the bnd gradle plugin to our compile dependencies. The dependencies will then be resolved and loaded from applying our plugin
2. Use shadow to shade all dependencies into our plugin jar