java - Which version of Quartz is compatible with Spring 2.5.6 -

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currently application using spring 2.5.6 , opensymphony.quartz-1.6.1 , deployed on jboss6.

i have been given task upgrade quartz version if possible. when try stable version 1.8.6 or 2.0.2 or 2.2.0 - following error : 

org.quartz.schedulerexception: threadpool class 'org.quartz.simpl.simplethreadpool' not instantiated.  [see nested exception: java.lang.classcastexception: org.quartz.simpl.simplethreadpool cannot cast org.quartz.spi.threadpool]

there no direct reference given threadpool in code.
due class clashes ?

i oberved thing - on upgrading version - groupid changes 'org.quartz-scheduler' 'opensymphony.quartz'.
because 2.5.6 doesn't supports greater quartz versions ?

thanks
dhananjay


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