Fix "value parse is not a member of object org.joda.time.DateTime"

When you search this error message, you will find the answer that you missed joda-convert in your dependencies. The answer is correct.

[error] MySpec.scala:27: value parse is not a member of object org.joda.time.DateTime
[error]       val from = DateTime.parse("2013-03-01")
[error]                           ^

However, our project still reported this error even we were 100% sure joda-convert was included in the classpath. Our project has transitive dependencies on joda-time:joda-time:2.1 and org.joda:joda-convert:1.2 through play:play_2.10:2.1.1. If typing "show test:dependency-classpath" in Play console, joda-convert is in the output, and the jar in ivy repository is ok.

It turns out that we have another dependency providing org.joda.time.DateTime: org.jruby:jruby-complete:1.6.5, a transitive dependency through org.apache.hbase:hbase:0.94.2-cdh4.2.0. If joda-time comes first, you have no problem, otherwise, you see the error. Because it doesn't always happen, you might be lucky not experience this problem at all.

The fix is really simple, excluding jruby-complete from the dependency:

"org.apache.hbase" % "hbase" % hbaseVersion exclude ("org.slf4j", "slf4j-log4j12") exclude ("org.slf4j", "slf4j-api") exclude
      ("org.jruby", "jruby-complete")