It looks like a recent change is causing what is technically a version 
conflict in GWT when used from maven. A project I work on uses the 
maven-enforcer-plugin to avoid conflicts, and in a rebuild this morning we 
ran into this error.

[INFO] --- maven-enforcer-plugin:1.4.1:enforce (enforce) @ gwt-project ---
[WARNING] 
Dependency convergence error for org.ow2.asm:asm-commons:5.0.3 paths to 
dependency are:
+-colins.super.duper:gwt-project:0.0.1-SNAPSHOT
  +-com.google.gwt:gwt-dev:2.8.0-SNAPSHOT
    +-org.ow2.asm:asm-commons:*5.0.3*
and
+-colins.super.duper:gwt-project:0.0.1-SNAPSHOT
  +-com.google.gwt:gwt-dev:2.8.0-SNAPSHOT
    +-org.eclipse.jetty:jetty-annotations:9.2.14.v20151106
      +-org.ow2.asm:asm-commons:*5.0.1*


This appears to have been introduced 
in https://gwt-review.googlesource.com/#/c/14461/, though it could have 
been earlier. I'm not familiar with how exactly we settled on 5.0.1, and if 
we must use that (and override jetty...), or if we can upgrade to 5.0.3 and 
not risk affecting jetty.

Locally, I'm overriding this by excluding asm-commons from my gwt-dev 
dependencies, and requiring 5.0.3, which seems to be working (minus a 
jsinterop issue, which I am now hunting...). Thoughts on which version we 
should require? I can make the patch once I have feedback.

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