Exception message : Got minus one from a read call
원인 :
1. If the remote server has been configured (e.g. in the "SQLNET.ora" file) to not accept connections from your IP.
2. If the JDBC url is incorrect, you could be attempting to connect to something that isn't a database.
3. If there are too many open connections to the database service, it could refuse new connections.
멀쩡히 사용중이던 JDBC connection 에서 위와같은 에러를 뱉는다면 대개 3번 케이스.
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