java.net should not throw NotYetConnectedException

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Note: this issue was migrated automatically using bugzilla2github

Original bug ID: BZ#111227
From: @guillerodriguez
Reported version: 0.99

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Comment author: @guillerodriguez

In addition to the fact that the isConnected check is probably wrong (see #31), if the socket is really not connected, this should not result in a NotYetConnectedException for java.net. NotYetConnectedException was introduced with java.nio and is an unchecked exception, and thus probably not expected by code using java.net.

A SocketException should be used in this case instead.