Why Does My Java Server Receive 'java.net.SocketException: Connection Reset' Even When the Client Appears Connected?

Understanding "java.net.SocketException: Connection Reset" in Server-Side Communication

When attempting to read data from a socket using readInt() in Java, you may encounter the error "java.net.SocketException: Connection reset." This indicates that the client has unexpectedly closed the connection. However, you've confirmed that the client is not terminating the connection, leaving you puzzled about the cause.

Potential reasons for this error include:

1. Intentional Connection Reset:
   In rare cases, applications may deliberately reset connections. This is discouraged but can occur in commercial software.
2. Protocol Error:
   Writing to a connection that has been closed normally by the other end can trigger this error. Ensure you follow the correct application protocol.
3. Unread Data in Socket Buffer:
   Closing a socket while there is unread data in the socket's receive buffer can lead to this problem.
4. Network Issues (Windows Specific):
   Windows can report "software caused connection abort" instead of "connection reset" due to network issues originating from your end.
5. Process Termination (Windows Specific):
   Unlike Unix-based systems, Windows does not properly close sockets when a process exits without doing so. This can cause connections to be reset.

To resolve this issue, investigate the following:

• Check the client's log files to ensure no connection reset is occurring.
• Verify that you are not writing to a closed connection accidentally.
• Ensure there is no unread data in the socket buffer before closing it.
• If necessary, troubleshoot network issues if using Windows.
• Clarify whether the process is terminating prematurely on Windows without closing the connection.

By addressing these potential causes, you can identify the root of the "java.net.SocketException: Connection reset" error and establish a stable server-side communication.

The above is the detailed content of Why Does My Java Server Receive 'java.net.SocketException: Connection Reset' Even When the Client Appears Connected?. For more information, please follow other related articles on the PHP Chinese website!