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Understand ThreadLocal in one picture
2022-07-04 16:52:00 【Hide on jdk】
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
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