I am getting an error:

(conn:7) Could not read packet: unexpected end of stream, read 0 bytes from 4

I see a reference to a similar problem reported in https://jira.mariadb.org/browse/CONJ-348 for the connector.

this recommends the solution of adding ?useServerPrepStmts=false to the connection string.

Unfortunately I am making heavy use of stored procedures and stored procedures automatically have their prepared statemsnts buffered so the second time I use the procedure it crashes with the above error.

this error comes from a statement similar to:

SELECT *
FROM MY_TABLE MT
WHERE EXISTS ( SELECT *
FROM MYVIEW MV
WHERE MV.FIELD1 = MT.FIELD1 )
AND MT.FIELD2 = V_VALUE;

The view is quite complicated and essentially implements a security system I have been working on for some months so its a bit of blocker to rolling out a system.

the text in /CONJ-348 suggests this server error is to be fixed in 10.1.21 so I have upgraded to that but the issue still remains.