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https://issues.apache.org/jira/browse/DIRAPI-13?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861086#action_12861086
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Kiran Ayyagari commented on DIRAPI-13:
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Recursively browsing a directory containing large number of entries is not a
good idea cause the cursors will be left open (and the client keep receiving the
entries) which will definitely lead to OOM.
> Recursively drilling into the directory structure causes
> java.lang.OutOfMemoryError
> -----------------------------------------------------------------------------------
>
> Key: DIRAPI-13
> URL: https://issues.apache.org/jira/browse/DIRAPI-13
> Project: Directory client API
> Issue Type: Bug
> Affects Versions: 0.1.0
> Environment: Windows XP SP3
> Reporter: Sebu Koleth
>
> private static void recursivelyDescend(LdapConnection connection,
> String dn) {
> System.out.println("Searching for children of dn : " + dn);
> try
> {
> Cursor<SearchResponse> cursor = connection.search(dn,
> "(objectclass=*)", SearchScope.ONELEVEL, "*");
> while (cursor.next())
> {
> SearchResponse response = cursor.get();
> if(response instanceof SearchResultEntry) {
> recursivelyDescend(connection,
> ((SearchResultEntry)response).getObjectName().getName());
> } else {
> System.out.println("Unusable response
> type " + response);
> }
> }
> } catch (LdapException le) {
> le.printStackTrace();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> The above piece of code is exercised after obtaining an SSL-based LDAP
> connection. The target server has hundreds of thousands of records at
> different levels. Logging at WARN level shows a *lot* of messages :
> WARN NioProcessor-1 org.apache.directory.shared.asn1.ber.Asn1Decoder - The
> PDU has been fully decoded but there are still bytes in the buffer.
> The code chokes at processing the 52nd entry that is two levels deep from the
> base DN. At this level there are around 1000 sub-levels.
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