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Tough Extension Problem: How do get info from a ON_ADD_USERS_TO_ROLES event


I am trying to get the information for an ON_ADD_USERS_TO_ROLES event but I have no idea how to set the info.

I get the exception "...ON_ADD_USERS_TO_ROLES. Extension reports Parameter id added_users_to_roomroles not found in extension context"

I need something like what is contained in the following code for "IRoomInfo".

IRoomInfoReader roomInfoReader = (IRoomInfoReader)context.getValue(RoomExtensionParameter.ROOM_INFO);

IExtensionResult result = extensionFactory.createExtensionResult(0);

result.putValue("RoomID", roomInfoReader.getId());

I have decompiled all the SAP extensions and I can't find a single example..



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2 Answers

  • Best Answer
    Posted on Nov 19, 2004 at 09:20 AM

    Hi Dick,

    IRoomUsers roomUsers = (IRoomUsers) ctx.getValue(RoomExtensionParameter.ADDED_USERS_TO_ROOMROLES);

    The IRoomUsers Interface in fact in described at (yeah, something is documented).

    Hope it helps


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  • Posted on Nov 23, 2004 at 08:17 AM

    Hi Detlev,

    You mentioned problems / workarounds when combining the ON_CREATE_ROOM and ON_ADD_USERS_TO_ROLES extensions.

    I always get the following exception when I try to combine the two extensions:

    at ON_CREATE_ROOM. Extension reports Parameter added_users_to_roomroles is missing.

    The two extensons work fine by themselves but they don't work when they are combined. The key from the context appears to be missing but I don't know why



    private IParameterInfo roomInfoInfo;

    private IParameterInfo newUserInfo;

    public TestExtension() {

    roomInfoInfo =




    newUserInfo =

    extensionFactory.createSystemParameterInfo( RoomExtensionParameter.ADDED_USERS_TO_ROOMROLES, , true);

    service_key = GENERIC_SERVICE_KEY + "." +



    public IParameterInfo[] getInputParameterInfos(IExtensionPoint extensionPoint) {

    IParameterInfo result[] = null;

    result = new IParameterInfo[2];

    result[0] = roomInfoInfo;

    result[1] = newUserInfo;

    return result;





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    • Dear Dick,

      the extension parameter "RoomExtensionParameter.ADDED_USERS_TO_ROOMROLES" is not available at ON_CREATE_ROOM. Therefore you cannot request this parameter in the method "getInputParameterInfos()" for the extension point ON_CREATE_ROOM. You also need a disctinction in the "process()" method:

      if (RoomExtensionPoint.ON_CREATE_ROOM.equals(point)) {
        IRoomInfoReader roomInfo = (IRoomInfoReader)context.getValue(RoomExtensionParameter.ROOM_INFO);
      if (RoomExtensionPoint.ON_ADD_USERS_TO_ROLES.equals(point)) {
        String roleName = (String)context.getValue(RoomExtensionParameter.ADDED_USERS_TO_ROOMROLES);

      In the "Room Extensions Developer Guide", there is a table "Extension Points and Context" that explains, which parameters are available at which extension point.

      This thread gets a little long - would you please open a new thread for each problem?

      Thank you, and best regards


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