Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  MysqlIO.java:2409 com.mysql.jdbc.MysqlIO.reuseAndReadPacket(..) returning                             

Thu Jul 02 10:43:58 KST 2015 TRACE:                 --> Buffer.java:262 com.mysql.jdbc.Buffer.readByte()

Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  Buffer.java:262 com.mysql.jdbc.Buffer.readByte(..) returning 32

Thu Jul 02 10:43:58 KST 2015 TRACE:                 --> Buffer.java:232 com.mysql.jdbc.Buffer.getPosition()

Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  Buffer.java:232 com.mysql.jdbc.Buffer.getPosition(..) returning 1

Thu Jul 02 10:43:58 KST 2015 TRACE:                 --> Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength()

Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength(..) returning 37

Thu Jul 02 10:43:58 KST 2015 TRACE:                 --> Buffer.java:211 com.mysql.jdbc.Buffer.getBytes(0, 1)

Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  Buffer.java:211 com.mysql.jdbc.Buffer.getBytes(..) returning [B@1638fa9

Thu Jul 02 10:43:58 KST 2015 TRACE:                 --> Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength()

Thu Jul 02 10:43:58 KST 2015 TRACE:                 <--  Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength(..) returning 37

Thu Jul 02 10:43:58 KST 2015 TRACE:                <--  MysqlIO.java:2907 com.mysql.jdbc.MysqlIO.checkErrorPacket(..) returning 20                          . 

Thu Jul 02 10:43:58 KST 2015 TRACE:                --> Buffer.java:232 com.mysql.jdbc.Buffer.getPosition()

Thu Jul 02 10:43:58 KST 2015 TRACE:                <--  Buffer.java:232 com.mysql.jdbc.Buffer.getPosition(..) returning 1

Thu Jul 02 10:43:58 KST 2015 TRACE:                --> Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength()

Thu Jul 02 10:43:58 KST 2015 TRACE:                <--  Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength(..) returning 37

Thu Jul 02 10:43:58 KST 2015 TRACE:                --> Buffer.java:211 com.mysql.jdbc.Buffer.getBytes(0, 1)

Thu Jul 02 10:43:58 KST 2015 TRACE:                <--  Buffer.java:211 com.mysql.jdbc.Buffer.getBytes(..) returning [B@2f6ca0f5

Thu Jul 02 10:43:58 KST 2015 TRACE:                --> Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength()

Thu Jul 02 10:43:58 KST 2015 TRACE:                <--  Buffer.java:185 com.mysql.jdbc.Buffer.getBufLength(..) returning 37

Thu Jul 02 10:43:58 KST 2015 TRACE:               <--  MysqlIO.java:885 com.mysql.jdbc.MysqlIO.checkErrorPacket(..) returning 20   

전자정부 프레임워크를 쓰고 있구요.

오라클 설정을 mysql로 바꾼 이후로 이런오류가 계속 발생하네요.  왜 이런가요?