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Status Delivered
Workspace IBM i
Categories Web Serving
Created by Guest
Created on Jan 3, 2020

IWS - Remove the limit in the number of fields in the program parameters

Our development system uses IWS to expose RPG programs to the UI. The structure of the interfaces is divided into a classic scheme with two parameters: request and response. Some of these programs have a large number of fields (more than 2,000) and unfortunately, during the distribution of services, this exceeds the limits of IWS.

Use Case:

Development of modern and complete interfaces without limitations in the definition of management interfaces.

Idea priority High
  • Guest
    Jun 3, 2022
    Delivered in IBM i 7.3 and above releases. For more information, see
  • Guest
    Jul 1, 2020

    The install failed because the web service being deployed had more than 1500 input fields and/or more than 1200 output fields, which resulted in a Java method being generated that exceeded the maximum byte limit for a Java method.

    The fix will increase the number of input and output fields that may be processed by doing three things:

    (1) Removing unnecessary code that was being produced to handle an individual field.

    (2) Removing the duplication of converter objects.

    (3) Handling non-primitive parameters - data structure parameters - in their own Java method.

    As a result, each non-primitive input parameter can have a maximum of approximately 3800 fields, and each non-primitive output parameter can have approximately 3800 fields, with a variance of approximately 3-5%, depending if there are arrays and whether the field is a string or numeric.

    As a result, one will be able to pass in multiple non-primitive input parameters that will multiply the total number of input fields that can be processed. For example, if you have two input parameters where each input parameter has 2000 fields, then total number if input fields that may be processed is 4000.

    The same holds true for non-primitive output parameters.

    It should be noted that all calculations are approximations, and the maximum number of actual input and output parameters may vary.

    Finally, in order to pick up the fix, you will have to redeploy the web service.

    Following PTFs have been approved:

    SI73312 V7R4M0
    SI73313 V7R3M0
    SI73314 V7R2M0

    We will still look at removing limitation on a per-parameter basis.

  • Guest
    Jan 6, 2020

    IBM agrees with the request and a solution appears to be desirable and feasible. IBM intends to provide a solution. However, IBM's plans may change and no commitment is made that a solution will be provided.