java.sql.SQLException: Connections could not be acquired from the underlying database! [See nested exception: java.sql.SQLException: Connections could not be acquired from the underlying database!]] at org.quartz.impl.jdbcjobstore.JobStoreSupport.schedulerStarted(JobStoreSupport.java:693) at org.quartz.core.QuartzScheduler.start(QuartzScheduler.java:580) at org.quartz.impl.StdScheduler.start(StdScheduler.java:142) at org.quartz.ee.servlet.QuartzInitializerListener.contextInitialized(QuartzInitializerListener.java:198) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3830) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:719) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:566) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Caused by: org.quartz.JobPersistenceException: Failed to obtain DB connection from data source ‘myDS’: java.sql.SQLException: Connections could not be acquired from the underlying database! [See nested exception: java.sql.SQLException: Connections could not be acquired from the underlying database!] at org.quartz.impl.jdbcjobstore.JobStoreSupport.getConnection(JobStoreSupport.java:777) at org.quartz.impl.jdbcjobstore.JobStoreTX.getNonManagedTXConnection(JobStoreTX.java:71) at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3774) at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3739) at org.quartz.impl.jdbcjobstore.JobStoreSupport.recoverJobs(JobStoreSupport.java:833) at org.quartz.impl.jdbcjobstore.JobStoreSupport.schedulerStarted(JobStoreSupport.java:691) … 18 more 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.quartz.utils.PoolingConnectionProvider.getConnection(PoolingConnectionProvider.java:247) at org.quartz.utils.DBConnectionManager.getConnection(DBConnectionManager.java:108) at org.quartz.impl.jdbcjobstore.JobStoreSupport.getConnection(JobStoreSupport.java:774) … 23 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) … 27 more

以上問題可能有一下原因造成：

1，驅動配置有誤：driver=com.mysql.jdbc.Driver 2，資料庫連線地址有誤：url=jdbc:mysql://localhost:3306/test 3，密碼或帳號有誤：username=root password=root 4，資料庫未啟動或無權訪問 5，專案未引入對應的驅動jar包mysql-connector-java-5.1.6-bin.jar 6,mysql root沒有遠端訪問的許可權，需要增加許可權，增加許可權的步驟如下： 進入mysql資料庫： grant all privileges on . to ‘root’@’%’ identified by ‘root’ with grant option; flush privileges;