当prefs.get()执行时,我有这个错误：

Caused by: org.springframework.orm.hibernate3.HibernateJdbcException: JDBC exception on Hibernate data access: sqlException for sql [insert into SmsBean (destination,message,origin,sens,status,USER_ID) values (?,?,?)]; sql state [41000]; error code [1205]; could not insert:

Caused by: java.sql.sqlException: Lock wait timeout exceeded; try restarting transaction

    at com.MysqL.jdbc.sqlError.createsqlException(sqlError.java:1075)
    at com.MysqL.jdbc.MysqLIO.checkErrorPacket(MysqLIO.java:3562)
    at com.MysqL.jdbc.MysqLIO.checkErrorPacket(MysqLIO.java:3494)
    at com.MysqL.jdbc.MysqLIO.sendCommand(MysqLIO.java:1960)
    at com.MysqL.jdbc.MysqLIO.sqlQueryDirect(MysqLIO.java:2114)
    at com.MysqL.jdbc.ConnectionImpl.execsql(ConnectionImpl.java:2696)
    at com.MysqL.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2105)
    at com.MysqL.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2398)
    at com.MysqL.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2316)
    at com.MysqL.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2301)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:101)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
    ... 39 more

这是因为setup方法中的smsDao.deleteAllSms在sms表上持有一个锁.

如何正确避免此锁定超时并能够成功运行我的测试？

谢谢你的帮助.

仅供参考,这是一些控制台输出：

DEBUG - Adding transactional method 'checkLanguagePreferenceTest' with attribute: PROPAGATION_required,ISOLATION_READ_COMMITTED; ''
DEBUG - Explicit transaction definition [PROPAGATION_required,ISOLATION_READ_COMMITTED; ''] found for test context [[TestContext@b76fa testClass = MessagingServiceTest,locations = array['file:src/main/resources/myapp-context.xml','file:src/main/resources/myapp-data.xml','file:src/main/resources/myapp-services.xml'],testInstance = fr.myapp.service.MessagingServiceTest@b01d43,testMethod = checkLanguagePreferenceTest@MessagingServiceTest,testException = [null]]]
DEBUG - Retrieved @TransactionConfiguration [@org.springframework.test.context.transaction.Tran sactionConfiguration(defaultRollback=false,transactionManager=txManager)] for test class [class fr.myapp.service.MessagingServiceTest]
DEBUG - Retrieved TransactionConfigurationAttributes [[TransactionConfigurationAttributes@5f7d3f transactionManagerName = 'txManager',defaultRollback = false]] for class [class fr.myapp.service.MessagingServiceTest]
DEBUG - Returning cached instance of singleton bean 'txManager'
DEBUG - Creating new transaction with name [checkLanguagePreferenceTest]: PROPAGATION_required,ISOLATION_READ_COMMITTED; ''
DEBUG - Opened new Session [org.hibernate.impl.SessionImpl@666a53] for Hibernate transaction
DEBUG - Preparing JDBC Connection of Hibernate Session [org.hibernate.impl.SessionImpl@666a53]
DEBUG - Changing isolation level of JDBC Connection [org.apache.commons.dbcp.PoolableConnection@1bde3d2] to 2
DEBUG - Exposing Hibernate transaction as JDBC transaction [org.apache.commons.dbcp.PoolableConnection@1bde3d2]
DEBUG - No method-level @Rollback override: using default rollback [false] for test context [[TestContext@b76fa testClass = MessagingServiceTest,testException = [null]]]
INFO - Began transaction (1): transaction manager [org.springframework.orm.hibernate3.HibernateTransa ctionManager@17753a8]; rollback [false]
Hibernate: delete from SmsBean where USER_ID=?
Hibernate: select user0_.id as id3_1_,user0_.email as email3_1_,user0_.login as login3_1_,user0_.passwd as passwd3_1_,smsbeans1_.USER_ID as USER7_3_3_,smsbeans1_.id as id3_,smsbeans1_.id as id0_0_,smsbeans1_.destination as destinat2_0_0_,smsbeans1_.message as message0_0_,smsbeans1_.origin as origin0_0_,smsbeans1_.sens as sens0_0_,smsbeans1_.status as status0_0_,smsbeans1_.USER_ID as USER7_0_0_ from User user0_ left outer join SmsBean smsbeans1_ on user0_.id=smsbeans1_.USER_ID where user0_.id=?
Hibernate: select user0_.id as id3_,user0_.email as email3_,user0_.login as login3_,user0_.passwd as passwd3_ from User user0_ where user0_.login=?
Hibernate: select userprefs0_.id as id2_,userprefs0_.language as language2_,userprefs0_.USER_ID as USER3_2_ from user_prefs userprefs0_ where userprefs0_.USER_ID=?
wait completion of async task
DEBUG - Returning cached instance of singleton bean 'txManager'
INFO - Ener dans checkLanguagePreference(1)
DEBUG - opening Hibernate Session
DEBUG - Registering Spring transaction synchronization for new Hibernate Session
Hibernate: select userprefs0_.id as id2_,userprefs0_.USER_ID as USER3_2_ from user_prefs userprefs0_ where userprefs0_.USER_ID=?
Hibernate: select user0_.id as id3_1_,smsbeans1_.USER_ID as USER7_0_0_ from User user0_ left outer join SmsBean smsbeans1_ on user0_.id=smsbeans1_.USER_ID where user0_.id=?
INFO - Checking if same sms command already exist
Hibernate: select * from smsbean S where S.USER_ID=? and S.status=? and S.message=?
DEBUG - Flushing Hibernate Session on transaction synchronization

//Deadlock here :
Hibernate: insert into SmsBean (destination,?)
DEBUG - Closing Hibernate Session
58799 [SimpleAsyncTaskExecutor-1] WARN org.hibernate.util.JDBCExceptionReporter - sql Error: 1205,sqlState: 41000
58799 [SimpleAsyncTaskExecutor-1] ERROR org.hibernate.util.JDBCExceptionReporter - Lock wait timeout exceeded; try restarting transaction

已经解决了,但我之前已经创建了一个关于MysqL论坛的一个主题,关于为什么我从DBMS的角度来看这个死锁.这是链接(也解释得很好)：

http://forums.mysql.com/read.php?97,409237#msg-409237