问题
When I connect to a database using a connection pool I get this exception.
So then I tried connecting to the database using the basic Class.forName(); and DriverManager method I was able to do so.. why is this happening ?
回答1:
This problem may arise wherever a connection pool is involved. The reason for this is as follows.
The Reason:
- Say in your application you have configured a connection pool. And you ask for a 5 connection objects.
- Your connection pool is usually handled by a Container like Tomcat, Spring, or CQ5(in my case)
- Now you leave your application idle for some time, but the container and the connection pool is still active
- And now the magic trick, the Database server restarts as per schedule.
- This makes the alive/active connection objects inside your application servers's connection Pool BROKEN
- So you come in the next moment and suddenly you get these errors when it was working fine some time ago.
The Solution:
You can reset the connection pool- This is the best option. This would delete the current broken Connections residing in the pool and forcefully create a new Connection Pool with new connection objects inside them.
You can restart the application server. Not recommended.(You can't keep restarting application servers in Production)
Reference Link
来源：https://stackoverflow.com/questions/27898780/java-sql-sqlrecoverableexception-no-more-data-to-read-from-socket-when-using-a