Bug 49994 - NamingContext Possible Bug
Summary: NamingContext Possible Bug
Alias: None
Product: Tomcat 7
Classification: Unclassified
Component: Catalina (show other bugs)
Version: trunk
Hardware: PC Linux
: P2 normal (vote)
Target Milestone: ---
Assignee: Tomcat Developers Mailing List
Depends on:
Reported: 2010-09-24 07:59 UTC by Gurkan Erdogdu
Modified: 2010-11-04 14:03 UTC (History)
0 users


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Description Gurkan Erdogdu 2010-09-24 07:59:24 UTC
In NamingContext implementation, if "lookup()" is a Reference, current
implementation caches the result of the NamingManager # getObjectInstance via
following statements and changes the type of the entry. In the following
lookups, same object is returned. I would like to write ObjectFactory that
returns new instance for each time lookup is called on its reference. But with
the current implementation, it is not possible to write such an object factory
because of aferomentioned sitaution. I think that entry must be stay as
Reference instead of changing entry type.

NamingContext class:

protected Object lookup(Name name, boolean resolveLinks)
        throws NamingException {
            } else if (entry.type == NamingEntry.REFERENCE) {
                try {
                    Object obj = NamingManager.getObjectInstance
                        (entry.value, name, this, env);
                    if (obj != null) {
                        entry.value = obj;                           
                        entry.type = NamingEntry.ENTRY;  ---> CHANGES type of
the naming entry
                    return obj;
                } catch (NamingException e) {
                    throw e;
                } catch (Exception e) {
                            ("namingContext.failResolvingReference"), e);
                    throw new NamingException(e.getMessage());

Comment 1 Gurkan Erdogdu 2010-09-24 08:00:08 UTC
Comments from David Jencks:

For reference, the EE 6 platform spec explains that usually a new instance should be returned on each lookup in section 5.2.4 page 67 "Sharing of Environment Entries".  The servlet 3.0 spec section 15.2.2 page 174 indicates that this applies to servlet containers that are part of an EE technology-compliant implementation.  I guess this means that unless tomcat implements web profile they don't have to support this?  It still seems like a good idea to me.

david jencks
Comment 2 Mark Thomas 2010-10-08 07:59:54 UTC
This has been fixed in trunk and will be included in 7.0.4 onwards. I also added a test case for this and a related issue (bug 23950).
Comment 3 Mark Thomas 2010-11-04 14:03:17 UTC
Note this behaviour will be configurable from 7.0.5 onwards and will default to the previous behaviour of returning the same object for each lookup.