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  1. OMG Issue

I2JAV13 — Description of ORB.init parameters insufficient

  • Key: I2JAV13-2
  • Legacy Issue Number: 3643
  • Status: open  
  • Source: International Business Machines ( Russell Butek)
  • Summary:

    I have a number of questions/concerns about the description/usage of
    ORB.init arguments/properties.

    1. There are only two properties described in the Java mapping spec:
    org.omg.CORBA.ORBClass and org.omg.CORBA.ORBSingletonClass. Setting these
    via property are described, but not setting these via application string
    array (ie., args in main). Yet the spec says these values can be obtained
    via the args array. I believe most folks assume "-ORBClass xxx" is the
    convention, since that's what the JDK's ORB uses, but it's not documented.

    2. Ditto for applet parameters. It's assumed that they are of the form

    <param name = "org.omg.CORBA.ORBClass" value = "xxx">

    but it is not documented.

    3. Can this convention be generalized to accommodate the argument naming
    convention in the core spec? If we follow the convention that says
    org.omg.CORBA.ORBClass becomes -ORBClass; then can we say that a parameter
    -ORBXXX may also be specified by the property or applet parameter

    4. The text around the ORB arguments is tightly coupled to only ORBClass
    and ORBSingletonClass. It does not seem to expect other args/properties.
    For example: "...when creating an ORB instance, the class names of the ORB
    implementation are located using the following search order: ...". I
    assume the following search order also applies to any args/props.

    5. The spec doesn't allow for extensions.

    "See Table 1-3 for a list of the property names and values that are
    recognized by
    ORB.init. Any property names not in this list shall be ignored by

    Has the INS spec updated this table with -ORBInitRef and
    -ORBDefaultInitRef, for example? And the interceptor spec assumes that
    services are allowed to have their own arguments. And what about
    proprietary extensions? Given the word "shall", any extensions are

    6. Repeated arguments fall apart when presented as Properties. For
    example, the INS spec allows for the following invocation:

    java myapp -ORBInitRef XX=xx -ORBInitRef YY=yy -ORBInitRef ZZ=zz

    Since Properties entries are <key, value> pairs, and only one pair for a
    given key can exist, then if we tried entering the above as Properties we'd
    only get on of them, not all. I'm not sure how to fix this. Dictate that
    XX, YY, ZZ be the end of the ORBInitRef string rather than the start of a
    new string, perhaps? So then, specifying these as system properties for
    example, we'd have:

    java myapp -Dorg.omg.CORBA.ORBInitRefXX xx -Dorg.omg.CORBA.ORBInitRefYY yy
    -Dorg.omg.CORBA.ORBInitRefZZ zz

    That causes ugly parsing problems. We'd have to search the whole list of
    properties that contained a key that merely BEGAN with
    "org.omg.CORBA.ORBInitRef". And this falls apart in applets; we can get a
    list of all Properties, but we cannot get a list of all applet parameters.
    Personally I think this is a failing in the applet class, but that's life
    as we know it.

    I'm sorry to raise this as one issue instead of six, but most of these
    points are tightly coupled, so I didn't want to distance them from each
    other. And I'd like them all to be answered together anyway.

  • Reported: I2JAV 1.0 — Thu, 25 May 2000 04:00 GMT
  • Updated: Wed, 11 Mar 2015 11:15 GMT