Understand ThreadLocal in one picture

 

 

Important variables ：thread , threadlocal ,threadlocalmap ,entries( Note that this is a weak reference , meet gc Direct release ), Finally remove

 

adopt threadlocal To solve

begin->connect->close autocommit->jdbc->commit

 

Weak and weak ：

Weak reference ： meet gc Recycling

key Release value Don't release , Memory leak

Lock failure ,i Is a variable value