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PI80313: Enable Post Data to be read multiple times.

Fixes are available

17.0.0.2: WebSphere Application Server Liberty 17.0.0.2
17.0.0.3: WebSphere Application Server Liberty 17.0.0.3
17.0.0.4: WebSphere Application Server Liberty 17.0.0.4
18.0.0.1: WebSphere Application Server Liberty 18.0.0.1
18.0.0.2: WebSphere Application Server Liberty 18.0.0.2
18.0.0.3: WebSphere Application Server Liberty 18.0.0.3
18.0.0.4: WebSphere Application Server Liberty 18.0.0.4
19.0.0.1: WebSphere Application Server Liberty 19.0.0.1
19.0.0.2: WebSphere Application Server Liberty 19.0.0.2
19.0.0.3: WebSphere Application Server Liberty 19.0.0.3
19.0.0.4: WebSphere Application Server Liberty 19.0.0.4
19.0.0.5: WebSphere Application Server Liberty 19.0.0.5
19.0.0.6: WebSphere Application Server Liberty 19.0.0.6
19.0.0.7: WebSphere Application Server Liberty 19.0.0.7
19.0.0.8: WebSphere Application Server Liberty 19.0.0.8
19.0.0.9: WebSphere Application Server Liberty 19.0.0.9
19.0.0.10: WebSphere Application Server Liberty 19.0.0.10
19.0.0.11: WebSphere Application Server Liberty 19.0.0.11
19.0.0.12: WebSphere Application Server Liberty 19.0.0.12
20.0.0.1: WebSphere Application Server Liberty 20.0.0.1
20.0.0.2: WebSphere Application Server Liberty 20.0.0.2
20.0.0.3: WebSphere Application Server Liberty 20.0.0.3
20.0.0.4: WebSphere Application Server Liberty 20.0.0.4
20.0.0.5: WebSphere Application Server Liberty 20.0.0.5
20.0.0.6: WebSphere Application Server Liberty 20.0.0.6
20.0.0.7: WebSphere Application Server Liberty 20.0.0.7
20.0.0.8: WebSphere Application Server Liberty 20.0.0.8
20.0.0.9: WebSphere Application Server Liberty 20.0.0.9
20.0.0.10: WebSphere Application Server Liberty 20.0.0.10
20.0.0.11: WebSphere Application Server Liberty 20.0.0.11
20.0.0.12: WebSphere Application Server Liberty 20.0.0.12

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • It is not possible to read post data both as parameters and
    either using a InputStream or Reader. The second read will
    not receive any data. This may occur, for example, when a
    filter reads one or more parameters and a servlet tries to
    read the post data as an InputStream, or vice-versa.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server Liberty - Web Container              *
    ****************************************************************
    * PROBLEM DESCRIPTION: Enable Post Data to be read multiple    *
    *                      times.                                  *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    As part of request processing, post data may be read either as
    parameters, using an InputStream, or using a Reader.  However
    whichever method is used the WebContainer does a destructive
    read of the data such that the data may be read only once for a
    given request. So it is not possible to read post data both as
    parameters and either using an InputStream or Reader. The second
    read will not receive any data. This may occur, for example,
    when a filter reads one or more parameters and a servlet tries
    to read the post data as an InputStream, or vice-versa.
    

Problem conclusion

  • The WebContainer has been modified to enable multiple reads of
    post data when the following WebContainer custom property is set
    to true at the server level or the application level:
    
    Add this in server.xml
    <webContainer enablemultireadofpostdata="true" /> (default is
    false)
    
    or
       <context-param>
        <param-
    name>com.ibm.ws.webcontainer.SET_MULTI_READ_WEBAPP</param-name>
    <param-value>true</param-value>
      </context-param>
    
    The context-param value will override the server level value of
    the property.
    
    With this property set the post data can be read multiple times
    as either an InputStream, a Reader, or as parameters and in any
    combination.
    
    Further, to enable post data to be re-read from the beginning
    using an InputStream, a Reader, or as Parameters, the following
    sequence must be followed when using a Reader or InputStream:
    
    1. Obtain the InputStream or Reader
    2. Read data
    3. Close the InputStream or Reader ( important step to make re-
    read work)
    
    Note that internally the WebContainer completes this sequence
    when reading parameters.
    
    If either steps 1 or 3 are not observed the next read of the
    post data will not be reset to the beginning of the data.
    
    
    
    The fix for this APAR is currently targeted for inclusion in fix
    pack 17.0.0.2.  Please refer to the Recommended Updates page for
    delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI80313

  • Reported component name

    WAS LIBERTY COR

  • Reported component ID

    5725L2900

  • Reported release

    CD0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-04-20

  • Closed date

    2017-05-11

  • Last modified date

    2017-05-11

  • 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

    WAS LIBERTY COR

  • Fixed component ID

    5725L2900

Applicable component levels

  • RCD0 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSD28V","label":"WebSphere Application Server Liberty Core"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"CD0","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
18 October 2021