Github user mxm commented on the pull request:
https://github.com/apache/flink/pull/1412#issuecomment-172493786
The context environment is set in the `ScalaShellRemoteEnvironment` to
disable creation of new environments by the user. This is done when you first
create the batch environment. Then you create the
`ScalaShellRemoteStreamEnvironment` which internally creates the
`StreamRemoteEnvironment` which fails because the context environment is
already set.
You may work around this by setting the context environment (and thereby
disabling creation of other environments) **after** you have created both of
your shell environments.
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