NoSuchMethodError in Guava class when using weld + testfx

[mgznt]

Hi,

I'm developping a JavaFX app based on a framework called "mvvmfx" [1]. This framework uses CDI (Weld ) for dependency injection. For GUI tests, I wanted to use the testfx library [2], which provides a fluent API to test the GUI.

Here's where it gets interesting:

Depending on the loading order of testfx and weld-se jars, I get a NoSuchMethodError for Guava FluentIterable.toSet() deep down in a testfx method (Guava is a dependency of testfx [3]):

java.lang.NoSuchMethodError: com.google.common.collect.FluentIterable.toSet()Lcom/google/common/collect/ImmutableSet;

  at org.testfx.service.query.impl.NodeQueryUtils.rootOfWindow(NodeQueryUtils.java:66)

  at org.testfx.service.query.impl.NodeQueryUtils.rootsOfWindows(NodeQueryUtils.java:59)

  at org.testfx.service.finder.impl.NodeFinderImpl.rootsOfWindows(NodeFinderImpl.java:116)

  at org.testfx.service.finder.impl.NodeFinderImpl.fromAll(NodeFinderImpl.java:77)

  at org.testfx.service.finder.impl.NodeFinderImpl.lookup(NodeFinderImpl.java:62)

  at org.testfx.api.FxRobot.lookup(FxRobot.java:297)

  at org.testfx.api.FxRobot.pointOfVisibleNode(FxRobot.java:961)

  at org.testfx.api.FxRobot.clickOn(FxRobot.java:574)

  at io.iqe.testfxweld.AppTest.test(AppTest.java:18)

There are no transient dependencies from weld-se to Guava, so there's only one Guava-version (18.0) in the classpath. This version does have the FluentIterable.toSet() method!

I built a minimal sample project that shows the behavior. What's interesting is, that it is enough to have weld-se in the classpath to cause the NoSuchMethodError.

Steps to reproduce the problem:

1. Unzip testfxweld.zip

2. Run mvn clean install (In JDK 8, I'm on Win 7, 64Bit)

3. The build fails with the exception described above.

4. Change the ordering of weld-se and testfx-core in pom.xml

5. Run mvn clean install

6. The build succeeds

I'm not sure whether this is a bug in weld or testfx, but would be very grateful if someone had a look at it.

Thank you!

[1] sialcasa/mvvmFX · GitHub

[2] TestFX/TestFX · GitHub

[3] guava-libraries - Guava: Google Core Libraries for Java 1.6+ - Google Project Hosting

[mgznt]

After letting the problem rest for a few hours, the solution is of course rather simple: The weld-se jar does indeed contain a private copy of Guava, at version 13.0.1. This version does not contain the FluentIterable.toSet() method.

So I guess I have to include the weld-core, exclude its guava dependency and hope that Guava 18.0 does not break Weld.