IT18341: java.lang.ClassCastException when inquiring the MQ PCF message fields MQCAUT_BLOCKUSER and MQCAUT_BLOCKADDR

APAR status

• Closed as program error.

Error description

• For either BLOCKADDR or BLOCKUSER in a CHLAUTH rule you can
  provide a list of addresses or users.
  .
  For each of these fields the type is listed in the MQ Knowledge
  Center as:
  .
  AddrList (MQCFSL)
  A list of up to 100 IP address patterns which are banned from
  accessing this queue manager on any channel
  (parameter identifier: MQCACH_CONNECTION_NAME_LIST).
  .
  UserList (MQCFSL)
  A list of up to 100 user IDs which are banned from use of this
  channel or set of channels
  (parameter identifier: MQCACH_MCA_USER_ID_LIST).
  .
  It was discovered that, if the command server's response from
  the MQCMD_INQUIRE_CHLAUTH_RECS command contained multiple IP
  addresses or user IDs, the PCF message conformed to that listed
  in the MQ Knowledge Center.  That is, the field type was MQCFSL.
  However, if the response contained a single IP address or a
  single user ID, the field type was MQCFST.
  .
  In MQ Java, when you inquire the PCF message fields
  MQCACH_CONNECTION_NAME_LIST and MQCACH_MCA_USER_ID_LIST you
  have to use the getStringParameterValue method when there is
  only 1 user or address and the getStringListParameterValue
  method when there are multiple addresses or users.
  .
  The exception triggered when using the
  getStringListParameterValue when only one address or user is
  blocked is:
  .
  Exception:
  java.lang.ClassCastException: java.lang.String cannot be cast
  to java.lang.String
  .
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This affects users of PCF applications, which query channel
  authentication (CHLAUTH) records of type BLOCKUSER or BLOCKADDR.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When responding to an inquire chlauth request
  (MQCMD_INQUIRE_CHLAUTH_RECS) for BLOCKUSER or BLOCKADDR records,
  the MQ queue manager's command server incorrectly returned the
  MQCACH_MCA_USER_ID_LIST and MQCACH_CONNECTION_NAME_LIST fields
  as string type (MQCFST) instead of string list (MQCFSL) if there
  was only one item the list.
  

Problem conclusion

• The MQ queue manager's command server logic has been updated to
  always return MQCACH_CONNECTION_NAME_LIST and
  MQCACH_MCA_USER_ID_LIST as a string list type (MQCFSL) in its
  response to the MQCMD_INQUIRE_CHLAUTH_RECS command.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.0       8.0.0.8
  v9.0 CD    9.0.4
  v9.0 LTS   9.0.0.3
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WMQ BASE MULTIP

• Fixed component ID

  5724H7251

Applicable component levels

• R800 PSY

     UP