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This is to ensure that data that may still be in socket
buffers when close() is called are sent to the other side.
This mainly applies to the Shadow VM agent, because it only
sends data to the Shadow VM server and does not expect any
reply, but it is probably a good practice in general.

Simplify method that receives data from socket channel.

Simplify method that receives data from socket channel.

Let the request processor return an error response instead of throwing
an Exception.
Catch a Throwable in the request loop to detect unexpected exceptions.
Decrement number of workers even after receiving exception.
Print java.home and java.class.path properties in debug mode.