错误代码
12-Dec-2022 16:16:59.120 警告 [RMI TCP Connection(15)-127.0.0.1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads web应用程序[JavaWeb_Test_Book]仍在处理一个尚未完成的请求。这很可能会造成内存泄漏。您可以使用标准上下文实现的unloadDelay属性来控制请求完成所允许的时间。请求处理线程的堆栈跟踪：[
java.base@11.0.13/jdk.internal.misc.Unsafe.park(Native Method)
java.base@11.0.13/java.util.concurrent.locks.LockSupport.park(LockSupport.java:194)
java.base@11.0.13/java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2081)
com.alibaba.druid.pool.DruidDataSource.takeLast(DruidDataSource.java:2208)
com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1680)
com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1417)
com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1397)
com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1387)
top.qaqaq.utils.JdbcUtils.getConnection(JdbcUtils.java:37)
top.qaqaq.dao.impl.BaseDao.queryForSingleValue(BaseDao.java:90)
top.qaqaq.dao.impl.BookDaoImpl.queryForPageTotalCount(BookDaoImpl.java:50)
top.qaqaq.service.impl.BookServiceImpl.page(BookServiceImpl.java:52)
top.qaqaq.web.BookServlet.page(BookServlet.java:28)
java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
java.base@11.0.13/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
java.base@11.0.13/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.base@11.0.13/java.lang.reflect.Method.invoke(Method.java:566)
top.qaqaq.web.BaseServlet.doPost(BaseServlet.java:31)
top.qaqaq.web.BaseServlet.doGet(BaseServlet.java:20)
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:705)
jakarta.servlet.http.HttpServlet.service(HttpServlet.java:814)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
原因
在写jdbc时没关闭连接 记得关闭连接
