Catching and Processing Referral Exceptions in Java

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Catching and Processing Referral Exceptions
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The default behavior of the SDK is to throw a referral exception if a referral is received from the server For search requests, the exception is thrown while the client iterates through the search results; for all other operations the exception is delivered on the request itself On enumerating the results of a search, you can choose to use the nextElement method or the next method The former returns Object, which may be an entry, a referral exception object, or another exception object; it does not throw exceptions The latter returns an entry but may throw a referral or other exception:
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// Option 1 Use nextElement() and examine the object type // returned LDAPSearchResults res = ldsearch( ENTRY, ldSCOPE_ONE, "objectclass=*", attrs, false, cons ); while ( reshasMoreElements() ) { Object o = resnextElement(); if ( o instanceof LDAPEntry ) { LDAPEntry entry = (LDAPEntry)o; // Do something with this entry } else if ( o instanceof LDAPReferralException ) { LDAPReferralException e = (LDAPReferralException)o; LDAPUrl refUrls[] = egetURLs(); for (int i=0; i<refUrlslength; i++) { Systemoutprintln(refUrls[i]getUrl() );
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When the Data Lives Elsewhere: Managing Referrals 573
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// Do something with this referral } } else { LDAPException e = (LDAPException)o; // Do something about this exception } } // Option 2 Use next() and catch the exceptions while ( reshasMoreElements() ) { try { LDAPEntry theEntry = resnext(); // Do something with this entry } catch ( LDAPReferralException e ) { LDAPUrl refUrls[] = egetURLs(); for (int i=0; i<refUrlslength; i++) { Systemoutprintln(refUrls[i]getUrl() ); // Do something with this referral } } catch ( LDAPException e ) { // Do something about this exception } }
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Using next, as in option 2 in the preceding example, is generally more convenient All other requests must be handled in a way similar to option 2:
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try { lddelete( "uid=sam, ou=people, o=Airiuscom" ); } catch ( LDAPReferralException e ) { LDAPUrl refUrls[] = egetURLs(); for (int i=0; i<refUrlslength; i++) { Systemoutprintln(refUrls[i]getUrl() ); // Do something with this referral } } catch ( LDAPException e ) { // Do something about this exception }
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Automatic Referrals: Anonymous or under Client Control
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Most LDAP client applications prefer to have referrals handled transparently by the SDK, outside of the main code body, rather than detecting and processing referrals everywhere an LDAP operation is executed There are two ways to enable automatic referral handling:
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LDAPConnectionsetReferrals( ldREFERRALS, new Boolean( true ) ); LDAPConstraintssetReferrals( true ); If the connection has the referral option set to true, or constraints are supplied with the referral option enabled, then the client code doing LDAP operations will never see a referral exception The highlighted sections of the previous examples can be eliminated If a referral is encountered during the execution of the operation, the SDK will make a new temporary connection to the referred-to server if necessary and continue the operation there The hopLimit parameter of the constraints, or the REFERRALS_HOP_LIMIT option of the connection, determines how many links to follow on a referral before giving up The default limit is 10 The default behavior on automatic referral following is not to authenticate (that is, to use an anonymous connection) to the referred-to server To supply credentials for the referred-to connection, you must implement the LDAPRebind interface and supply an instance of the implementation to LDAPConstraintssetRebindProc or to LDAPConnectionsetOption( LDAPConnectionREFERRALS_REBIND_PROC ) The interface speci es a single method getRebindAuthentication to provide credentials, using a host name and port as input parameters It is common to supply the same credentials to the referred-to server as were used to authenticate to the original server, as in the following example:
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protected void setDefaultReferralCredentials( LDAPConnection conn ) { final LDAPConnection m_conn = conn; LDAPRebind rebind = new LDAPRebind() { public LDAPRebindAuth getRebindAuthentication( String host, int port ) { return new LDAPRebindAuth( m_conngetAuthenticationDN(), m_conngetAuthenticationPassword() ); } }; LDAPSearchConstraints cons = conngetSearchConstraints(); conssetReferrals( true ); conssetRebindProc( rebind ); connsetSearchConstraints( cons ); }
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The method extracts the credentials from an authenticated connection and stores them for use on referrals When LDAPRebindProcgetRebindAuthentication is called by the SDK, an LDAPRebindAuth object is instantiated using the stored credentials
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