thorntail-issue

First Build and Install the Example Dependency

$ mvn -f needs-guava clean install

Then Build and Run the Working Example

$ mvn -f guava-fail clean package
$ java -jar guava-fail/target/guava-fail-thorntail.jar

This should startup successfully, but the app doesn't do anything so there's nothing to test.

INFO  [org.wildfly.swarm] (main) THORN99999: Thorntail is Ready

Then Build and Run the Failing Example

$ mvn -f guava-fail -P with-dse clean package
$ java -jar guava-fail/target/guava-fail-thorntail.jar

This should fail with the following root cause:

ERROR [stderr] (main) WELD-001474: Class io.thorntail.example.NeedsGuava is on the classpath, but was ignored because a class it references was not found: com.google.common.cache.Cache from [Module \"deployment.guava-fail.war\" from Service Module Loader].

What's Going on Here?

The needs-guava project contains a trivial CDI bean io.thorntail.example.NeedsGuava which has a dependency on the com.google.common.cache.Cache class provided by Guava. The project pom expresses a dependency on Guava version 27.0-jre.

The guava-fail project contains a trivial JAX-RS application io.thorntail.example.GuavaFail which is also a CDI bean and injects io.thorntail.example.NeedsGuava from the needs-guava project. The guava-fail pom expresses a dependency on needs-guava.

This setup works fine until we activate the with-dse profile which expresses a dependency on the Datastax DSE driver version 1.7.0 whcih in turn depends on Guava version 19.0. With the new dependencies, the thorntail plugin decides to strip the Guava JAR (and its dependencies) from the WEB-INF/lib directory in the WAR.