JDBC是否找到未关闭连接的来源？

Question

I am having issues where somewhere in my project several connections to mysql are not being closed, causing my application to become very slow after a couple of days,essentially forcing me to restart my application server.

To find the source of this issue i created a map where the key was the class and method name of what was making the connection, and as the value a count that would get incremented and decremented every time that method made/closed a connection, i thought this would let me see which method making a connection to the database was leaving a lot of connections open, this turned out to be inaccurate.

What would you suggest i do to find the source of the unclosed connection other than manually going through the code to find the source?

Thanks.

Answer 1

One solution (not straight forward) would to use BTrace. You would create scripts intercepting the java.sql.connection code

https://kenai.com/projects/btrace

The requirement would be however:

1. Either you would be using Oracle JDK6+
2. Or running application with Sun JDK5 on Solaris.

Answer 2

You could use aspectj to add tracing/logging/interceptors at various methods ( DriverManager.getConnection etc.).

However I suggest centralizing your connection management, and paying attention to handle exceptions correctly (even this can be centralized).

Answer 3

使用可以捕获放弃的连接的连接池，例如Apache DNCP。