[英]Error in running Java Code code ( Unknown character set: 'utf8mb4' )?
[英]After MySQL change to utf8mb4, Error Unknown character set index for field '224' received from server
我已經將我們的服務器MySQL數據庫更改為使用utf8mb4,因為我們需要支持表情符號。 我遵循了Mathias Bynens撰寫的基於如何在MySQL數據庫中支持完整Unicode的指令。 唯一的區別是我沒有改變utf8。
這是配置:
[client]
default-character-set = utf8mb4
[mysql]
default-character-set = utf8mb4
[mysqld]
character-set-client-handshake = FALSE
init-connect = 'SET NAMES utf8mb4'
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
這是MySQL SHOW VARIABLES
輸出:
mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';
+--------------------------+--------------------+
| Variable_name | Value |
+--------------------------+--------------------+
| character_set_client | utf8mb4 |
| character_set_connection | utf8mb4 |
| character_set_database | utf8mb4 |
| character_set_filesystem | binary |
| character_set_results | utf8mb4 |
| character_set_server | utf8mb4 |
| character_set_system | utf8 |
| collation_connection | utf8mb4_unicode_ci |
| collation_database | utf8mb4_unicode_ci |
| collation_server | utf8mb4_unicode_ci |
+--------------------------+--------------------+
10 rows in set (0.00 sec)
在我重新啟動MySQL和我的應用程序之后,控制台打印了錯誤日志,如下所示:
2014-08-05 17:33:49,022 [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2] WARN com.mchange.v2.resourcepool.BasicResourcePool - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6ae03500 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:
java.sql.SQLException: Unknown character set index for field '224' received from server.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.Connection.getCharsetNameForIndex(Connection.java:3556)
at com.mysql.jdbc.Field.<init>(Field.java:192)
at com.mysql.jdbc.MysqlIO.unpackField(MysqlIO.java:731)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:387)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2076)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1451)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1787)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3206)
at com.mysql.jdbc.Statement.executeQuery(Statement.java:1232)
at com.mysql.jdbc.Connection.loadServerVariables(Connection.java:4478)
at com.mysql.jdbc.Connection.initializePropsFromServer(Connection.java:4062)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2789)
at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Aug 5, 2014 5:33:49 PM org.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 0, SQLState: null
Aug 5, 2014 5:33:49 PM org.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: Connections could not be acquired from the underlying database!
Aug 5, 2014 5:33:49 PM org.hibernate.util.JDBCExceptionReporter logExceptions
WARNING: SQL Error: 0, SQLState: null
Aug 5, 2014 5:33:49 PM org.hibernate.util.JDBCExceptionReporter logExceptions
SEVERE: Connections could not be acquired from the underlying database!
登錄我的CMS或API調用不起作用。 它給了我上面的錯誤,我不能谷歌任何解決方案。
下一步該怎么做才能修復錯誤?
我也在那里,我通過簡單地將連接器升級到"mysql-connector-java-5.1.30-bin.jar"
來修復它。 希望它會有所幫助。
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