spring与mybatis整合时，数据库配置信息正确，报：发生了连接权限故障。原因：用户标识或密码无效
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
### The error may exist in com/springmybatis/dao/UserMapper.xml
### The error may involve com.springmybatis.dao.UserMapper.getUserById
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:92)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
at com.sun.proxy.$Proxy10.selectOne(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:159)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:87)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:57)
at com.sun.proxy.$Proxy11.getUserById(Unknown Source)
at com.springmybatis.dao.UserMapperImpl.getUserById(UserMapperImpl.java:19)
at test.getUserByIdTest(test.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
### The error may exist in com/springmybatis/dao/UserMapper.xml
### The error may involve com.springmybatis.dao.UserMapper.getUserById
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
... 29 more
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:80)
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67)
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:85)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
... 36 more
Caused by: com.ibm.db2.jcc.am.SqlInvalidAuthorizationSpecException: [jcc][t4][2013][11249][4.16.53] 发生了连接权限故障。原因：用户标识或密码无效。 ERRORCODE=-4214, SQLSTATE=28000
at com.ibm.db2.jcc.am.fd.a(fd.java:737)
at com.ibm.db2.jcc.am.fd.a(fd.java:60)
at com.ibm.db2.jcc.am.fd.a(fd.java:120)
at com.ibm.db2.jcc.t4.b.f(b.java:2445)
at com.ibm.db2.jcc.t4.b.b(b.java:1808)
at com.ibm.db2.jcc.t4.y.r(y.java:955)
at com.ibm.db2.jcc.t4.y.k(y.java:492)
at com.ibm.db2.jcc.t4.y.c(y.java:142)
at com.ibm.db2.jcc.t4.b.k(b.java:1384)
at com.ibm.db2.jcc.t4.b.b(b.java:1297)
at com.ibm.db2.jcc.t4.b.a(b.java:6433)
at com.ibm.db2.jcc.t4.b.b(b.java:848)
at com.ibm.db2.jcc.t4.b.a(b.java:765)
at com.ibm.db2.jcc.t4.b.a(b.java:423)
at com.ibm.db2.jcc.t4.b.a(b.java:398)
at com.ibm.db2.jcc.t4.b.<init>(b.java:336)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:233)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:199)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:474)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:115)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:208)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:153)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:144)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:155)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:120)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
... 46 more
原因是用户名变量是user
而某个实体类的简称也被命名为user
故调试时，总是报连接数据库时 用户名或密码无效。
解决方法：
将数据库配置信息的用户名变量改为其他值如username，再次测试，正常。