ThreadLocal / Memory Problems with Analyzer class

hi,

environment: lucene 2.4, jdk 1.6

i'm using quartz jobs to schedule indexing tasks; currently i'm creating a
new instance of an analyzer each time i open the index; after some time i'm
getting a out of memory;

Analyzer Class:
private ThreadLocal tokenStreams;

since the analyzer class is using a thread local -> should i reuse an
analyzer (e.g singleton pattern) in this case (quartz job reusing threads
(=tread pool) -> thread local data never gets freed)...)?

Mem dump:

Class name
--------------------------------------------------------------------------------------------------------------------------------------
org.quartz.simpl.SimpleThreadPool$WorkerThread @ 0xb4e8070
QuartzScheduler_Worker-3 Thread| 120 | 55.914.144 | 21,65%
......
......

thanks