警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@40bb7f0a – 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:
错误信息：

E:\JDK1.8.301\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:E:\IDEA\IDEA\IntelliJ IDEA 2021.2\lib\idea_rt.jar=59025:E:\IDEA\IDEA\IntelliJ IDEA 2021.2\bin" -Dfile.encoding=UTF-8 -classpath "E:\IDEA\IDEA\IntelliJ IDEA 2021.2\lib\idea_rt.jar;E:\IDEA\IDEA\IntelliJ IDEA 2021.2\plugins\junit\lib\junit5-rt.jar;E:\IDEA\IDEA\IntelliJ IDEA 2021.2\plugins\junit\lib\junit-rt.jar;E:\JDK1.8.301\jre\lib\charsets.jar;E:\JDK1.8.301\jre\lib\deploy.jar;E:\JDK1.8.301\jre\lib\ext\access-bridge-64.jar;E:\JDK1.8.301\jre\lib\ext\cldrdata.jar;E:\JDK1.8.301\jre\lib\ext\dnsns.jar;E:\JDK1.8.301\jre\lib\ext\jaccess.jar;E:\JDK1.8.301\jre\lib\ext\jfxrt.jar;E:\JDK1.8.301\jre\lib\ext\localedata.jar;E:\JDK1.8.301\jre\lib\ext\nashorn.jar;E:\JDK1.8.301\jre\lib\ext\sunec.jar;E:\JDK1.8.301\jre\lib\ext\sunjce_provider.jar;E:\JDK1.8.301\jre\lib\ext\sunmscapi.jar;E:\JDK1.8.301\jre\lib\ext\sunpkcs11.jar;E:\JDK1.8.301\jre\lib\ext\zipfs.jar;E:\JDK1.8.301\jre\lib\javaws.jar;E:\JDK1.8.301\jre\lib\jce.jar;E:\JDK1.8.301\jre\lib\jfr.jar;E:\JDK1.8.301\jre\lib\jfxswt.jar;E:\JDK1.8.301\jre\lib\jsse.jar;E:\JDK1.8.301\jre\lib\management-agent.jar;E:\JDK1.8.301\jre\lib\plugin.jar;E:\JDK1.8.301\jre\lib\resources.jar;E:\JDK1.8.301\jre\lib\rt.jar;C:\Users\13288\Desktop\heimaExample\itheima_spring_jdbc\target\test-classes;C:\Users\13288\.m2\repository\mysql\mysql-connector-java\5.1.32\mysql-connector-java-5.1.32.jar;C:\Users\13288\.m2\repository\c3p0\c3p0\0.9.1.2\c3p0-0.9.1.2.jar;C:\Users\13288\.m2\repository\com\alibaba\druid\1.1.10\druid-1.1.10.jar;C:\Users\13288\.m2\repository\junit\junit\4.12\junit-4.12.jar;C:\Users\13288\.m2\repository\org\hamcrest\hamcrest-core\1.3\hamcrest-core-1.3.jar;C:\Users\13288\.m2\repository\org\springframework\spring-context\5.0.5.RELEASE\spring-context-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-aop\5.0.5.RELEASE\spring-aop-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-beans\5.0.5.RELEASE\spring-beans-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-core\5.0.5.RELEASE\spring-core-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-jcl\5.0.5.RELEASE\spring-jcl-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-expression\5.0.5.RELEASE\spring-expression-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-test\5.0.5.RELEASE\spring-test-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-web\5.0.5.RELEASE\spring-web-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-webmvc\5.0.5.RELEASE\spring-webmvc-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\javax\servlet\javax.servlet-api\3.0.1\javax.servlet-api-3.0.1.jar;C:\Users\13288\.m2\repository\javax\servlet\jsp\javax.servlet.jsp-api\2.2.1\javax.servlet.jsp-api-2.2.1.jar;C:\Users\13288\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.9.0\jackson-core-2.9.0.jar;C:\Users\13288\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.9.0\jackson-databind-2.9.0.jar;C:\Users\13288\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.9.0\jackson-annotations-2.9.0.jar;C:\Users\13288\.m2\repository\commons-fileupload\commons-fileupload\1.3.1\commons-fileupload-1.3.1.jar;C:\Users\13288\.m2\repository\commons-io\commons-io\2.3\commons-io-2.3.jar;C:\Users\13288\.m2\repository\org\springframework\spring-jdbc\5.0.5.RELEASE\spring-jdbc-5.0.5.RELEASE.jar;C:\Users\13288\.m2\repository\org\springframework\spring-tx\5.0.5.RELEASE\spring-tx-5.0.5.RELEASE.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit4 com.itheima.test.JdbcTemplateTest
八月 26, 2021 9:31:26 下午 com.mchange.v2.log.MLog <clinit>
信息: MLog clients using java 1.4+ standard logging.
八月 26, 2021 9:31:27 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]
八月 26, 2021 9:31:27 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 31snbdaj1093wntc5f3ao|4f47d241, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 31snbdaj1093wntc5f3ao|4f47d241, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://localhost:3306/test, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]
八月 26, 2021 9:31:57 下午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@4b7e5e1 -- 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:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.Util.getInstance(Util.java:383)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2576)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)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$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)... 17 more八月 26, 2021 9:31:57 下午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@3dea5399 -- 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:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.Util.getInstance(Util.java:383)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2576)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)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$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)... 17 more八月 26, 2021 9:31:57 下午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@77358608 -- 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:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.Util.getInstance(Util.java:383)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2576)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)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)
Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)... 17 moreorg.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.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:600)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:850)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:905)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:915)at com.itheima.test.JdbcTemplateTest.test1(JdbcTemplateTest.java:36)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: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$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)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)... 27 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:1319)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)... 31 more八月 26, 2021 9:31:57 下午 org.springframework.context.support.AbstractApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@6536e911: startup date [Thu Aug 26 21:31:57 CST 2021]; root of context hierarchy
八月 26, 2021 9:31:57 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [applicationContext.xml]
八月 26, 2021 9:31:57 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager
信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 31snbdaj1093wntc5f3ao|223f3642, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 31snbdaj1093wntc5f3ao|223f3642, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql://localhost:3306/test?serverTimezone = UTC, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]
八月 26, 2021 9:32:27 下午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@23483c0e -- 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:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.Util.getInstance(Util.java:383)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2576)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)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$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)... 17 more八月 26, 2021 9:32:27 下午 com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
警告: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1b9d25c0 -- 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:
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.at sun.reflect.GeneratedConstructorAccessor13.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.Util.getInstance(Util.java:383)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1023)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2576)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2309)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)at sun.reflect.GeneratedConstructorAccessor8.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:419)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)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)
Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:3299)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1967)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1893)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1287)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2494)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2527)... 17 moreorg.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.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:600)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:850)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:905)at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:915)at com.itheima.test.JdbcTemplateTest.test2(JdbcTemplateTest.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: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$2.evaluate(ParentRunner.java:268)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:235)at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:529)at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)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)... 27 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:1319)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)... 31 moreProcess finished with exit code -1
解决方法

检查数据库版本，修改版本之后需要刷新maven
看看数据库账号密码写错没
换成8之后的就可以了
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错误信息：

解决方法

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