Fix (APAR):  PH00438

Status:  Fix

Release:  8.5.5.13,8.5.5.12

Operating System:  AIX,HP-UX,IBM i,Linux,Solaris,Windows,z/OS

Supersedes Fixes:  

CMVC Defect:  xxxxxx

Byte size of APAR:  257811

Date: 2019-01-07

Abstract:  provide switch to disable isolation of third-party jax-rs providers

Description/symptom of problem:  
PH00438 resolves the following problem:

ERROR DESCRIPTION:?                                             
moving from 8.5.5.11 to 8.5.5.12 breaks customer's application. 
The customer is getting ClassCastException.                     
Changing the classloader delegation is not helping.             
Tried the isolated library, and also not working.               

LOCAL FIX:?                                                     
NONE                                                            

PROBLEM SUMMARY:?

USERS AFFECTED:
 All users of IBM WebSphere Application
Server that use a third party JAXRS
provider that rely on WebSphere JAXRS
APIs.

PROBLEM DESCRIPTION:
WebSphere JAXRS applications that use
third party JAXRS providers but rely
on WebSphere JAXRS API's may
encounter exceptions.

RECOMMENDATION:
None

WebSphere JAXRS applications should use the JAXRS APIs
corresponding to the JAXRS provider they use.  APAR
PI75593 corrected the default behavior such that applications
using third party JAXRS providers could use the correct APIs.
However, some legacy applications that use third party JAXRS
providers were written to rely on the APIs delivered with
WebSphere.   Rather than require potentially complicated
adjustments to these legacy applications and the environments
in which they run, this APAR introduces a property
"com.ibm.websphere.jaxrs.isolateJaxrsThirdPartyImplementations"
that defaults to "TRUE" but can be set to "FALSE", allowing
users to revert to the previous behavior.

PROBLEM CONCLUSION:?                                            
The property                                                    
"com.ibm.websphere.jaxrs.isolateJaxrsThirdPartyImplementations" 
has been added.  This property will default to "TRUE" but can   
be set to "FALSE" to revert the behavior corrected under APAR   
PI75593 in WebSphere Application Server fix packs 8.5.5.12 and  
9.0.0.4.                                                        
                                                                
The fix for this APAR is currently targeted for inclusion in    
fix packs 9.0.0.9 and 8.5.5.15  Please refer to the Recommended 
Updates                                                         
page for delivery information:                                  
http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980   


Directions to apply fix:  
NOTE: Mark with an X the:
1) Release the fix applies to
2) The Editions that apply
3) And then DELETE THIS NOTE

Fix applies to Editions:
Release 8.5
__ Application Server (Express or BASE)
__ Network Deployment (ND)
__ Liberty Core
__ Edge Components
__ Developer

Install Fix to all WebSphere installations unless special instructions are included below.

Special Instructions: None

NOTE:
The user must:
* Logged in with the same authority level when unpacking a fix, fix pack or refresh pack.
* Be at V1.4.3 or newer of the Installation Manager. Certain iFixes may require a newer version of the Installation Manager and the Installation Manager will inform you during the installation process if a newer version is required.

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to apply the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before applying the iFixes.  Restart WebSphere Application Server after applying the iFixes.



Directions to remove fix:  

The IBM Knowledge Center can provide details, if needed, on the use of the Installation Manager to remove the iFixes.
http://publib.boulder.ibm.com/infocenter/install/v1r4/index.jsp.  Shutdown WebSphere Application Server before removing the iFixes.  Restart WebSphere Application Server after removing the iFixes.



Directions to re-apply fix:  
1) Shutdown WebSphere Application Server.

2) Follow the Fix instructions to apply the fix.

3) Restart WebSphere Application Server.





Additional Information: