问题描述
也许您已为 连接设置了超时，并且某些查询花费的 。这意味着您的 （“死”），并向 请求另一个 -直到数据库拔掉插头为止。
要调试此功能，请为连接池 ，以便您可以看到它何时请求新连接。
还检查您的 maxConnectionAge ***
解决方法
当我尝试在Web应用程序中创建250个以上的线程时，出现“无法获取连接，池错误，超时，等待空闲对象错误”的消息。我正在使用JSF
2.0和Hibernate创建Web应用程序。
我尝试使用修改过的hibernate.xml，server.xml，context.xml以及mysql属性。
以下是我得到的。
WARN (JDBCExceptionReporter.java:233) - SQL Error: 0,SQLState: null
ERROR (JDBCExceptionReporter.java:234) - Cannot get a connection,pool error Timeout waiting for idle object
ERROR (BaseServlet.java:301) - ******** java.lang.Thread.getStackTrace(Thread.java:1426)
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:140)
org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:128)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:52)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:449)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
sun.reflect.GeneratedMethodAccessor378.invoke(Unknown Source)
Caused by: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection,pool error Timeout waiting for idle object
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:114)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:92)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
sun.reflect.GeneratedMethodAccessor378.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1144)
org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:92)
org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:446)
org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:167)
org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:160)
org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:81)
org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)
sun.reflect.GeneratedMethodAccessor378.invoke(Unknown Source)
如果对此有任何想法请帮助我......