JavaWeb:c3p0配置问题-----java.sql.SQLException: Connections could not be acquired from the underlying database!
错误原因
c3p0的配置错误
错误显示
"C:\Program Files\Java\jdk1.8.0_162\bin\java.exe" -ea -Didea.test.cyclic.buffer.size= "-javaagent:D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\lib\idea_rt.jar=7816:D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\bin" -Dfile.encoding=UTF- -classpath "D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\lib\idea_rt.jar;D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\plugins\junit\lib\junit-rt.jar;D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\plugins\junit\lib\junit5-rt.jar;C:\Users\Administrator\.m2\repository\org\junit\platform\junit-platform-launcher\1.4.0-M1\junit-platform-launcher-1.4.0-M1.jar;C:\Users\Administrator\.m2\repository\org\apiguardian\apiguardian-api\1.0.0\apiguardian-api-1.0.0.jar;C:\Users\Administrator\.m2\repository\org\junit\platform\junit-platform-engine\1.4.0-M1\junit-platform-engine-1.4.0-M1.jar;C:\Users\Administrator\.m2\repository\org\junit\platform\junit-platform-commons\1.4.0-M1\junit-platform-commons-1.4.0-M1.jar;C:\Users\Administrator\.m2\repository\org\opentest4j\opentest4j\1.1.1\opentest4j-1.1.1.jar;C:\Users\Administrator\.m2\repository\org\junit\jupiter\junit-jupiter-engine\5.4.0-M1\junit-jupiter-engine-5.4.0-M1.jar;C:\Users\Administrator\.m2\repository\org\junit\jupiter\junit-jupiter-api\5.4.0-M1\junit-jupiter-api-5.4.0-M1.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_162\jre\lib\rt.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\classes;D:\Program\OperatingEnvironment\Tomcat\lib\jsp-api.jar;D:\Program\OperatingEnvironment\Tomcat\lib\servlet-api.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\c3p0-0.9.5.2.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\opentest4j-1.1.1.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\commons-dbutils-1.7.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\apiguardian-api-1.0.0.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\junit-jupiter-api-5.4.0-M1.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\mchange-commons-java-0.2.11.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\junit-platform-commons-1.4.0-M1.jar;D:\Program\Exercise\JavaWeb_Text\MVC_Exercise\web\WEB-INF\lib\mysql-connector-java-5.1.40-bin.jar" com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 -junit5 test.JdbcUtilsTest
十二月 , :: 下午 com.mchange.v2.log.MLog
信息: MLog clients using java 1.4+ standard logging.
十二月 , :: 下午 com.mchange.v2.c3p0.C3P0Registry
信息: Initializing c3p0-0.9.5.2 [built -December- :: -; debug? true; trace: ]
十二月 , :: 下午 com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource
信息: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> , acquireRetryAttempts -> , acquireRetryDelay -> , autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> , connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> mvcApp, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> 1b60m599z1pxd3r21653zeu|9a7504c, idleConnectionTestPeriod -> , initialPoolSize -> , jdbcUrl -> jdbc:mysql://localhost:3306/homework_mvc?useSSL=false&useUnicode=true&characterEncoding=UTF-8, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 50, maxStatements -> 20, maxStatementsPerConnection -> 5, minPoolSize -> 1, numHelperThreads -> 3, preferredTestQuery -> null, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ]
十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@533ed475 -- 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 (). Last acquisition attempt exception:
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:) 十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@1176dcec is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests.
十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@315263a -- 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 (). Last acquisition attempt exception:
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:) 十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@1176dcec is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests. java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:)
at dbdemo.JdbcUtils.getConnection(JdbcUtils.java:)
at test.JdbcUtilsTest.getConnection(JdbcUtilsTest.java:)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
at java.lang.reflect.Method.invoke(Method.java:)
at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:)
at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$(TestMethodTestDescriptor.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:)
at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
at java.util.ArrayList.forEach(ArrayList.java:)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
at java.util.ArrayList.forEach(ArrayList.java:)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:)
at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:)
at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$(DefaultLauncher.java:)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:)
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:)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:)
... more
Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:) 十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@a67e052 -- 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 (). Last acquisition attempt exception:
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:)
at sun.reflect.GeneratedConstructorAccessor7.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:)
at java.lang.reflect.Constructor.newInstance(Constructor.java:)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool.access$(BasicResourcePool.java:)
at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:) 十二月 , :: 下午 com.mchange.v2.resourcepool.BasicResourcePool
警告: Having failed to acquire a resource, com.mchange.v2.resourcepool.BasicResourcePool@1176dcec is interrupting all Threads waiting on a resource to check out. Will try again in response to new client requests. Process finished with exit code -
解决方法
仔细检查配置文档
配置文档
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<named-config name="mvcApp">
<property name="user">root</property>
<property name="password">root</property>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/homework_mvc?useSSL=false&useUnicode=true&characterEncoding=UTF-8</property>
<!--以上的user是数据库的用户，
password是数据库的密码，
driverClass是mysql的数据库驱动，
jdbcUrl是连接数据库的url ;--> <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数 -->
<property name="acquireIncrement"></property>
<!--初始化时获取十个连接，取值应在minPoolSize与maxPoolSize之间 -->
<property name="initialPoolSize"></property>
<!--连接池中保留的最小连接数 -->
<property name="minPoolSize"></property>
<!--连接池中保留的最大连接数 -->
<property name="maxPoolSize"></property>
<!--JDBC的标准参数，用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。如果maxStatements与maxStatementsPerConnection均为0，则缓存被关闭。Default: -->
<property name="maxStatements"></property>
<!--maxStatementsPerConnection定义了连接池内单个连接所拥有的最大缓存statements数。Default: -->
<property name="maxStatementsPerConnection"></property>
</named-config>
</c3p0-config>
成功显示
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