"C:\Program Files\Java\jdk1.8.0_60\bin\java.exe" -ea -Didea.test.cyclic.buffer.size=1048576 -javaagent:D:\IDEA\lib\idea_rt.jar=61942:D:\IDEA\bin -Dfile.encoding=UTF-8 -classpath "D:\IDEA\lib\idea_rt.jar;D:\IDEA\plugins\junit\lib\junit-rt.jar;D:\IDEA\plugins\junit\lib\junit5-rt.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_60\jre\lib\rt.jar;E:\javaIDEA\ssm\springIntegrationMybatis\target\classes;E:\maven\jars\org\mybatis\mybatis\3.4.6\mybatis-3.4.6.jar;E:\maven\jars\mysql\mysql-connector-java\5.1.38\mysql-connector-java-5.1.38.jar;E:\maven\jars\org\mybatis\caches\mybatis-ehcache\1.1.0\mybatis-ehcache-1.1.0.jar;E:\maven\jars\net\sf\ehcache\ehcache-core\2.6.11\ehcache-core-2.6.11.jar;E:\maven\jars\log4j\log4j\1.2.17\log4j-1.2.17.jar;E:\maven\jars\org\slf4j\slf4j-api\1.7.5\slf4j-api-1.7.5.jar;E:\maven\jars\org\slf4j\slf4j-log4j12\1.7.12\slf4j-log4j12-1.7.12.jar;E:\maven\jars\org\mybatis\generator\mybatis-generator-core\1.3.2\mybatis-generator-core-1.3.2.jar;E:\maven\jars\cglib\cglib\3.1\cglib-3.1.jar;E:\maven\jars\org\ow2\asm\asm\4.2\asm-4.2.jar;E:\maven\jars\asm\asm\3.3.1\asm-3.3.1.jar;E:\maven\jars\com\github\pagehelper\pagehelper\5.1.8\pagehelper-5.1.8.jar;E:\maven\jars\com\github\jsqlparser\jsqlparser\1.2\jsqlparser-1.2.jar;E:\maven\jars\org\springframework\spring-context\5.1.1.RELEASE\spring-context-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-beans\5.1.1.RELEASE\spring-beans-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-core\5.1.1.RELEASE\spring-core-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-jcl\5.1.1.RELEASE\spring-jcl-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-expression\5.1.1.RELEASE\spring-expression-5.1.1.RELEASE.jar;E:\maven\jars\org\mybatis\mybatis-spring\1.3.2\mybatis-spring-1.3.2.jar;E:\maven\jars\org\springframework\spring-aop\5.1.1.RELEASE\spring-aop-5.1.1.RELEASE.jar;E:\maven\jars\org\aspectj\aspectjweaver\1.9.2\aspectjweaver-1.9.2.jar;E:\maven\jars\org\springframework\spring-orm\5.1.1.RELEASE\spring-orm-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-tx\5.1.1.RELEASE\spring-tx-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-jdbc\5.1.1.RELEASE\spring-jdbc-5.1.1.RELEASE.jar;E:\maven\jars\org\springframework\spring-oxm\5.1.0.RELEASE\spring-oxm-5.1.0.RELEASE.jar;E:\maven\jars\com\mchange\c3p0\0.9.5.2\c3p0-0.9.5.2.jar;E:\maven\jars\com\mchange\mchange-commons-java\0.2.11\mchange-commons-java-0.2.11.jar;E:\maven\jars\commons-dbcp\commons-dbcp\1.4\commons-dbcp-1.4.jar;E:\maven\jars\commons-pool\commons-pool\1.5.4\commons-pool-1.5.4.jar;E:\maven\jars\junit\junit\4.12\junit-4.12.jar;E:\maven\jars\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit4 org.lisonglin.test.MyTest,testInsertWifes
log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error updating database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
at com.sun.proxy.$Proxy17.insert(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.insert(SqlSessionTemplate.java:278)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:58)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
at com.sun.proxy.$Proxy18.insert(Unknown Source)
at org.lisonglin.service.WifeService.testInsertTwoWifes(WifeService.java:14)
at org.lisonglin.test.MyTest.testInsertWifes(MyTest.java:20)
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:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$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 updating database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:200)
at org.apache.ibatis.session.defaults.DefaultSqlSession.insert(DefaultSqlSession.java:185)
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:497)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
... 29 more
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:81)
at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82)
at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68)
at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:338)
at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:84)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:49)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:198)
... 35 more
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:692)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140)
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:151)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78)
... 43 more
Caused by: com.mchange.v2.resourcepool.CannotAcquireResourceException: A ResourcePool could not acquire a resource from its primary factory or source.
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1469)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685)
... 47 more
Caused by: java.sql.SQLException: Access denied for user '12134'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1215)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2255)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
at sun.reflect.GeneratedConstructorAccessor9.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)
at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)
Process finished with exit code -1
这个错误完全找不到理由，可能是spring的规范吧。
如果你和我写一样的代码，那么恭喜你！可以解决错误，如果不是，很遗憾！至少我这里没有解决方案！
在整合spring和mybatis配置连接数据库的基本信息，要是你直接在连接。
<property name="user" value="root" />
<property name="password" value="123" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/stus?useUnicode=true&characterEncoding=utf8&useSSL=false" />
<property name="driverClass" value="com.mysql.jdbc.Driver" />那么没有任何问题，但是要是出现这种样子，使用properties配置文件，如写下这样格式：
<context:property-placeholder location="classpath:dp.properties"/>
<bean id="ds" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--连接数据库的基本信息-->
<property name="user" value="${username}" />
<property name="password" value="${password}" />
<property name="jdbcUrl" value="${url}" />
<property name="driverClass" value="${driver}" />
</bean>恭喜你！解决方案：
<context:property-placeholder location="classpath:dp.properties"/>
<!--数据源-->
<bean id="ds" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--连接数据库的基本信息-->
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="driverClass" value="${jdbc.driver}" />
</bean># 配置连接池属性
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/stus?useUnicode=true&characterEncoding=utf8&useSSL=false
jdbc.username=root
jdbc.password=123