這是queryById（）方法測試以后的結(jié)果

?因為本人是小白，一步一步跟著視頻做，所有步驟一步一步寫下來，和視頻里的一樣，連版本都寫的一樣的，不敢有一點差別，因為教程以外的東西懂得不多，絕對和視頻里一樣，可是單元測試就是一直報錯，沒有一個單元測試通過，很急！?。?！希望解答?。。?br />下面圖片只是一個測試方法的debug，就這么多錯，希望大神指點，盡量通俗一些，跪求解答?。?！

Connected to the target VM, address: '127.0.0.1:10606', transport: 'socket'

八月 29, 2018 5:53:35 下午 org.springframework.test.context.support.DefaultTestContextBootstrapper getDefaultTestExecutionListenerClassNames

信息: Loaded default TestExecutionListener class names from location [META-INF/spring.factories]: [org.springframework.test.context.web.ServletTestExecutionListener, org.springframework.test.context.support.DependencyInjectionTestExecutionListener, org.springframework.test.context.support.DirtiesContextTestExecutionListener, org.springframework.test.context.transaction.TransactionalTestExecutionListener, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener]

八月 29, 2018 5:53:35 下午 org.springframework.test.context.support.DefaultTestContextBootstrapper getTestExecutionListeners

信息: Using TestExecutionListeners: [org.springframework.test.context.web.ServletTestExecutionListener@4148db48, org.springframework.test.context.support.DependencyInjectionTestExecutionListener@282003e1, org.springframework.test.context.support.DirtiesContextTestExecutionListener@7fad8c79, org.springframework.test.context.transaction.TransactionalTestExecutionListener@71a794e5, org.springframework.test.context.jdbc.SqlScriptsTestExecutionListener@76329302]

八月 29, 2018 5:53:35 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions

信息: Loading XML bean definitions from class path resource [spring/spring-dao.xml]

八月 29, 2018 5:53:35 下午 org.springframework.context.support.GenericApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.support.GenericApplicationContext@55040f2f: startup date [Wed Aug 29 17:53:35 CST 2018]; root of context hierarchy

八月 29, 2018 5:53:36 下午 org.springframework.context.support.PropertySourcesPlaceholderConfigurer loadProperties

信息: Loading properties file from class path resource [jdbc.properties]

八月 29, 2018 5:53:36 下午 com.mchange.v2.log.MLog <clinit>

信息: MLog clients using java 1.4+ standard logging.

八月 29, 2018 5:53:36 下午 com.mchange.v2.c3p0.C3P0Registry banner

信息: Initializing c3p0-0.9.1.2 [built 21-May-2007 15:04:56; debug? true; trace: 10]

17:53:36.593 [main] DEBUG org.apache.ibatis.logging.LogFactory - Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.

17:53:36.659 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Class not found: org.jboss.vfs.VFS

17:53:36.660 [main] DEBUG org.apache.ibatis.io.ResolverUtil - JBoss 6 VFS API is not available in this environment.

17:53:36.660 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Class not found: org.jboss.vfs.VirtualFile

17:53:36.660 [main] DEBUG org.apache.ibatis.io.ResolverUtil - VFS implementation org.apache.ibatis.io.JBoss6VFS is not valid in this environment.

17:53:36.661 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Using VFS adapter org.apache.ibatis.io.DefaultVFS

17:53:36.661 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Find JAR URL: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity

17:53:36.661 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Not a JAR: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity

17:53:36.693 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Reader entry: Seckill.class

17:53:36.693 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Reader entry: SuccessKilled.class

17:53:36.693 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Listing file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity

17:53:36.693 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Find JAR URL: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity/Seckill.class

17:53:36.693 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Not a JAR: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity/Seckill.class

17:53:36.694 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Reader entry: ????? ?3 \

17:53:36.694 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Find JAR URL: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity/SuccessKilled.class

17:53:36.694 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Not a JAR: file:/D:/IDEA%20Java%e9%a1%b9%e7%9b%ae/seckill/target/classes/org/seckill/entity/SuccessKilled.class

17:53:36.694 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Reader entry: ????? ?3 T

17:53:36.694 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Checking to see if class org.seckill.entity.Seckill matches criteria [is assignable to Object]

17:53:36.695 [main] DEBUG org.apache.ibatis.io.ResolverUtil - Checking to see if class org.seckill.entity.SuccessKilled matches criteria [is assignable to Object]

17:53:36.695 [main] DEBUG o.m.spring.SqlSessionFactoryBean - Scanned package: 'org.seckill.entity' for aliases

17:53:36.722 [main] DEBUG o.m.spring.SqlSessionFactoryBean - Parsed configuration file: 'class path resource [mybatis-config.xml]'

17:53:36.773 [main] DEBUG o.m.spring.SqlSessionFactoryBean - Parsed mapper file: 'file [D:\IDEA Java項目\seckill\target\classes\mapper\SecKillDao.xml]'

17:53:36.780 [main] DEBUG o.m.spring.SqlSessionFactoryBean - Parsed mapper file: 'file [D:\IDEA Java項目\seckill\target\classes\mapper\SuccessKilledDao.xml]'

17:53:36.815 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession

17:53:36.820 [main] DEBUG org.mybatis.spring.SqlSessionUtils - SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@42257bdd] was not registered for synchronization because synchronization is not active

八月 29, 2018 5:53:36 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager

信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 2, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 1000, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 1hgedj59x10xiweuvz84jj|45a37759, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 1hgedj59x10xiweuvz84jj|45a37759, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://localhost:3306//seckill?useUnicode=true&characterEncoding=utf8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 30, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 10, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]

17:53:37.865 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@42257bdd]

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 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

### The error may exist in file [D:\IDEA Java項目\seckill\target\classes\mapper\SecKillDao.xml]

### The error may involve org.seckill.dao.SeckillDao.queryById

### The error occurred while executing a query

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:76)

at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:399)

at com.sun.proxy.$Proxy13.selectOne(Unknown Source)

at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:165)

at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:69)

at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)

at com.sun.proxy.$Proxy14.queryById(Unknown Source)

at org.seckill.dao.SeckillDaoTest.queryById(SeckillDaoTest.java:31)

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:47)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73)

at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)

at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)

at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)

at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68)

at org.junit.runners.ParentRunner.run(ParentRunner.java:309)

at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163)

at org.junit.runner.JUnitCore.run(JUnitCore.java:160)

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 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

### The error may exist in file [D:\IDEA Java項目\seckill\target\classes\mapper\SecKillDao.xml]

### The error may involve org.seckill.dao.SeckillDao.queryById

### The error occurred while executing a query

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:73)

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:386)

... 34 more

Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)

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:315)

at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:75)

at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61)

at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303)

at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102)

at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82)

at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)

... 41 more

Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)

at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)

at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)

at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)

at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)

... 51 more

Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@6d511b5f -- timeout at awaitAvailable()

at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)

at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)

at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)

... 54 more

Disconnected from the target VM, address: '127.0.0.1:10606', transport: 'socket'

Process finished with exit code -1