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From Otis Gospodnetic <otis_gospodne...@yahoo.com>
Subject Re: OutOfMemoryError
Date Wed, 18 Aug 2004 09:40:09 GMT
Reuse your IndexSearcher! :)

Also, I think somebody has written some EJB stuff to work with Lucene. 
The project is on SF.net.

Otis

--- Terence Lai <tlai@trekspace.com> wrote:

> Hi All,
> 
> I am getting a OutOfMemoryError when I deploy my EJB application. To
> debug the problem, I wrote the following test program:
> 
>     public static void main(String[] args) {
>         try {
>             Query query = getQuery();
> 
>             for (int i=0; i<1000; i++) {
>                 search(query);
>                 
>                 if ( i%50 == 0 ) {
>                     System.out.println("Sleep...");
>                     Thread.currentThread().sleep(5000);
>                     System.out.println("Wake up!");
>                 }
>             }            
>         } catch (Exception e) {
>             e.printStackTrace();
>         }
>     }
> 
>     private static void search(Query query) throws IOException {
>         FSDirectory fsDir = null;
>         IndexSearcher is = null;
>         Hits hits = null;
>         
>         try {
>             fsDir = FSDirectory.getDirectory("C:\\index, false);
>             is = new IndexSearcher(fsDir);
>             SortField sortField = new
> SortField("profile_modify_date",
>                 SortField.STRING, true);
> 
>             hits = is.search(query, new Sort(sortField));
>         } finally {
>             if (is != null) {
>                 try {
>                     is.close();
>                 } catch (Exception ex) {
>                 }
>             }
>             
>             if (fsDir != null) {
>                 try {
>                     is.close();
>                 } catch (Exception ex) {
>                 }
>             }
>         }
>         
>     }
> 
> In the test program, I wrote a loop to keep calling the search
> method. Everytime it enters the search method, I would instantiate
> the IndexSearcher. Before I exit the method, I close the
> IndexSearcher and FSDirectory. I also made the Thread sleep for 5
> seconds in every 50 searches. Hopefully, this will give some time for
> the java to do the Garbage Collection. Unfortunately, when I observe
> the memory usage of my process, it keeps increasing until I got the
> java.lang.OutOfMemoryError.
> 
> Note that I invoke the IndexSearcher.search(Query query, Sort sort)
> to process the search. If I don't specify the Sort field(i.e. using
> IndexSearcher.search(query)), I don't have this problem, and the
> memory usage keeps at a very static level.
> 
> Does anyone experience a similar problem? Did I do something wrong in
> the test program. I throught by closing the IndexSearcher and the
> FSDirectory, the memory will be able to release during the Garbage
> Collection.
> 
> Thanks,
> Terence
> 
> 
> 
> 
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