java flowable 提示连接错误是怎么回事？

[大板牙花生]

com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5003)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1233)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1225)
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90)
	at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:262)
	... 17 common frames omitted
2021-03-31 16:14:04 [org.flowable.eventregistry.impl.management.EventRegistryChangeDetectionRunnable:37] ERROR org.flowable.eventregistry.impl.management.EventRegistryChangeDetectionRunnable - Exception while detecting event registry changes
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is com.alibaba.druid.pool.DataSourceClosedException: dataSource already closed at Wed Mar 31 16:04:54 CST 2021
	at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:305)
	at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378)