Compile warnings when migrating from 2.3.0 to 2.4.0 or 2.5.0-rc1

Our project is in 2.3.0 and I've been looking into upgrading to 2.5.0-rc1 or 2.4.0.  It seems to work ok, but it introduces the following warnings when doing a gwt compile: 

     [java]    Validating units:

     [java]       Ignored 70 units with compilation errors in first pass.

     [java] Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.

     [java]    Computing all possible rebind results for 'com.google.gwt.useragent.client.UserAgentAsserter'

     [java]       Rebinding com.google.gwt.useragent.client.UserAgentAsserter

     [java]          Checking rule <generate-with class='com.google.gwt.editor.rebind.SimpleBeanEditorDriverGenerator'/>

     [java]             [WARN] Detected warnings related to 'com.google.gwt.editor.client.SimpleBeanEditorDriver'.   Are validation-api-<version>.jar and validation-api-<version>-sources.jar on the classpath?

     [java]             Specify -logLevel DEBUG to see all errors.

     [java]             [WARN] Unknown type 'com.google.gwt.editor.client.SimpleBeanEditorDriver' specified in deferred binding rule

I've made sure that the validation jars are on the classpath.

Anyone have any ideas?

Thanks!   

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