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我在摇摆应用程序中使用带有 c3p0 的休眠来访问数据库。c3p0 配置为c3p0.testConnectionOnCheckout=true. 因此，如果数据库断开连接（例如超时后），c3p0 会为我建立一个新连接。

它工作正常，但如果 DB 不可访问，c3p0 会冻结 GUI 一段时间，在 colsole 上打印休闲消息

26.06.2013 11:42:46,568 WARN [ThreadPoolAsynchronousRunner run] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@27d8f985 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
26.06.2013 11:42:46,573 WARN [ThreadPoolAsynchronousRunner run] com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@27d8f985 -- APPARENT DEADLOCK!!! Complete Status:
        Managed Threads: 3
        Active Threads: 3
        Active Tasks:
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1636d880 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2)
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@6abfc6e4 (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1)
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@549ad97c (com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0)
        Pending Tasks:
                com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask@23c8749
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@53d5cac4
Pool thread stack traces:
        Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#2,6,main]
                java.lang.Thread.sleep(Native Method)
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)
                com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
        Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#1,6,main]
                java.lang.Thread.sleep(Native Method)
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)
                com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
        Thread[com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0,6,main]
                java.lang.Thread.sleep(Native Method)
                com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1805)
                com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

然后大约 7 秒后org.hibernate.exception.GenericJDBCException: Could not open connection会抛出异常。一直以来，GUI都被阻止了。我真正想做的是显示一些进度条（不确定）和一些合理的消息，比如“连接丢失，试图重新连接”。我怎样才能做到这一点？也许 c3p0 对这样的东西有一些回调？

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