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From "Daniel Penning" <>
Subject Singleton and
Date Fri, 12 Dec 2008 19:06:00 GMT


I tried to implement a singleton pattern for my already working lucene

But there is a strange error when I tried to access the instance.


When my Singleton GetInstance() method is executed for the first time it
creates a new instance of my lucene object.

There are some member variables in this object like an IndexWriter and
IndexReader. These objects are created in the constructor and I can
access them directly in the constructor successfully.

GetInstance() now returns this lucene object and I have to execute some
operations on it. But the IndexWriter seems to be closed meanwhile and I
got the exception:

"    Exception: this IndexWriter is
closed" when my object tries to writer some documents.


How could this happen? Isn't it possible to use lucene with a


Kind regards,

D. Penning

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