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From "Shapira, Yoav" <>
Subject RE: BUG? TC 5.0.xx: WEB-INF/classes/ found but INITIAL_CONTEXT_FACTORY property gets overwritten by TC [Auf Viren geprüft]
Date Wed, 27 Oct 2004 15:14:27 GMT

OK.  Feel free to file a Bugzilla issue if you'd like.  If you have a .diff patch you'd like
to send along, that'd be great, and it will also improve the chances of someone looking at

Yoav Shapira

>-----Original Message-----
>From: []
>Sent: Wednesday, October 27, 2004 11:04 AM
>To: Tomcat Users List
>Subject: RE: BUG? TC 5.0.xx: WEB-INF/classes/ found but
>INITIAL_CONTEXT_FACTORY property gets overwritten by TC [Auf Viren geprüft]
>Dear Yoav,
>>>My understanding of J2EE standards is that the servlet container tries
>>>to find the file on the application classpath and if
>>>initializes the context environment with properties from there.
>>I don't think this understanding is correct for containers and J2EE
>servers.  IIRC you have to use the InitialContext construct with the >env
>argument which has the initial context factory class name.
>1. Tomcat (5.0.28,5.0.29beta) does search the on the
>application classpath and finds it, since:
>2. It reads my com.example.test.key=42 property
>3. It reads my
>java.naming.factory.object=com.sun.jndi.ldap.obj.LdapGroupFactory property
>which does not get overwritten
>4. Therefore I guess it reads my
>java.naming.factory.initial=com.sun.jndi.ldap.LdapCtxFactory property too,
>   but replaces it with, I
>presume for internal use and doesn't
>   set it back to original.
>5. If it finds two or more factories, specs say that they are to be
>concatenated by colons (':'), and
>  not - in contrast to the other properties - just take the first one.
>6. It does not throw a NoInitialContextException, even thought
>InitialLdapContext(); is implemented as InitialLdapContext(null,null);
>   so it gets some Context from somewhere:
>   (ctx instanceof DirContext) even equals true!
>So it tries to behave like I think it should behave, but fails due to what
>I call a bug.
>If it was illegal, it should give me an exception like
>NoInitialContextException, when I call InitialLdapContext().
>I would like to have a reference to a standards document where it says that
>there is an
>exception for containers and J2EE servers. I've searched this topic up and
>down the
>web and haven't found an exception. Instead Sun's Tutorial says:
>"So the environment, effectively, is the union of the environment parameter
>and all application resource files,
>with the additional rule that some standard properties could be gotten from
>applet parameters or system properties."
>This topic was already discussed in 2001 for Tomcat 3.x on
> but coming
>not to a solution, only a workaround:
>Since Tomcat is the reference implementation (of the spec) I would like to
>have a behavior
>according to the spec or a clarificaton of it.
>And I want to specify my basic LDAP connection properties only in one place
>with inheritance
>for many webapps and overriding some properties if needed in application
>Application specific property files cannot do that.
>Many thanks for thinking about this one.
>Frerk Meyer
>EDEKA Aktiengesellschaft
>GB Datenverarbeitung
>Frerk Meyer
>CC Web Technologien
>New-York-Ring 6
>22297 Hamburg
>Tel: 040/6377 - 3272
>Fax: 040/6377 - 41268
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