停止tomcat服務的時候，log裡面報了不少的記憶體錯誤資訊。經查詢是tomcat6.0.24以後會檢測到的問題。
leak cause
detected by tomcat
fixed by tomcat
possible enhancements
custom threadlocal class
>=6.0.24
>= 7.0.6
>=6.0.24
>= 7.0.6 no
>= 7.0.6
threadlocal pseudo-leak
>=6.0.24
>= 7.0.6
>=6.0.24
in 6.0.24-6.0.26 timerthread are stopped but it may lead to problems. optional from 6.0.27 with the clearreferencesstoptimerthreads flag. other threads may be stopped with the clearreferencesstopthreads flag, but it's unsafe.
contextclassloader / threads spawned by classes loaded by the common classloader
>=6.0.24
in 6.0.24-6.0.26 timerthread are stopped but it may lead to problems. optional from 6.0.27 with the clearreferencesstoptimerthreads flag. other threads may be stopped with the clearreferencesstopthreads flag, but it's unsafe.
fix the offending code (set the correct ccl when spawning the thread)
contextclassloader / threads spawned by jre classes
no >=6.0.24 pre-spawns some known offenders
static class variables
no > 6.0.? . disabled by default with tomcat 7
logfactory
> 6.0.?
jdbc driver registration
> 6.0.?
> 6.0.?
rmi target
> 6.0.?
還沒公升級的情況下，比如threadlocal的記憶體洩漏問題，tomca7中是用threadlocalleakpreventionlistener來解決的。
而tomcat6.0.24以後可以用context#clearreferencesthreadlocals=true來解決。
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