WTC Questions and Answers

Here are some common WTC questions and answers:
Q1: What is the transaction story for WTC between WLS and Tuxedo and how
does it differ from Jolt?
A1: In version 1.0 of WTC transactions may be started in WLS and will
"infect" Tuxedo with the same transaction. That implies that there is one
and only one commit coordinator, and that is in WLS. In version 1.0 of WTC
transactions originating
in Tuxedo via WTC is not supported. In version 1.1 of WTC transactions from
Tuxedo into WLS via WTC can be used, but only in Beta mode, as we will not
have done the required QA of "inbound" transactions. In order to use
inbound transactions in WTC 1.1 you will need to turn on the use of beta
features with an attribute called "UseBetaFeatures" on the WTC Startup class
in WLS.
This differs from Jolt in that while Jolt can start transactions in Tuxedo,
these transactions are not coordinated with anything in WLS. Hence it is
impossible to do a 2 phase commit which involves WLS resources and Tuxedo
resources with Jolt. Since Jolt does not have any means of invoking WLS
services transactions in that direction do not make sense.
Q2. How does the security mapping work?
A2: WLS and Tuxedo can share the same set of users (though they may be
administered differently in the two systems) and the users can propagate
their credentials from one system to the other. For example, if John Wells
logs into WLS then the services which he invokes in Tuxedo will have all of
the ACL permissions of John Wells as defined on the Tuxedo side.
Furthermore, if Jolene User logs into Tuxedo then any resources she attempts
to access in WLS via WTC will be checked against Jolene User's rights in WLS
land.
In order to accomplish this, a few things need to be set up:
1. You must be using Tuxedo 7.1 or Tuxedo 8.0 for this to work. Tuxedo 6.5
did not have the security infrastructure necessary to make this happen.
2. In your BDMCONFIG on the Tuxedo side you will need to set ACL_POLICY and
CREDENTIAL_POLICY to "GLOBAL" for the WLS remote domain. ACL_POLICY
controls whether or not a domain accepts credentials coming from a remote
domain and CREDENTIAL_POLICY controls whether or not we send credentials to
a remote domain. (In Tuxedo 7.1 there was no CREDENTIAL_POLICY - we always
sent the credentials to the remote domain).
3. In your BDMCONFIG on the WLS side you must likewise specify <ACL_POLICY>
and <CREDENTIAL_POLICY> to be "GLOBAL."
4. On the WLS side you must also configure a <TpUsrFile> which will point
to a file of the exact same format as the tpusr file generated by the
various Tuxedo commands to add and delete users. (Which also happens to be
of the same format as the unix /etc/passwd file). WTC needs this file
because in WLS users do not have user identification numbers or group
identification numbers. Hence we need a way to map WLS users into the
standard Tuxedo UID/GID appkey.
Voila! You have now set up your system such that users logged into either
system can be given access privelidges in the other system. This is known
as single sign-on. We are currently working on a way to better integrate
the two user databases between WLS and Tuxedo, and one day we will have
single administration and single-sign on!
Q3: How is the performance of WTC?
A3: Obviously, results will vary based on your machine, CPU, application
(i.e., transactions/no transactions) etc...
However, in the performance lab here we have seen WTC perform at levels that
nearly equal Tuxedo in a similar configuration. The performance is equal to
or better than Jolt, and will scale much better than Jolt because of the
concentration of network bandwidth.
Q4: What fail-over/fail-back mechanisms are there in WTC?
A4: WTC has many of the same fail-over fail-back mechanisms which /T
domains had. Any service can be offered by multiple remote domains, and if
a domain link is down we will attempt all of the backup domains. In /T
domains there was a limit of three backup remote domains, but in WTC there
is no limit to the number of backup domains you can configure for a service.
Furthermore, we support the connection policies of ON_STARTUP, ON_DEMAND and
INCOMING_ONLY. If the policy is ON_STARTUP then you can also configure a
retry interval and max-retries. We will attempt to connect to ON_STARTUP
remote domains every retry interval for a maximum number of retries before
giving up. If a domain is configured as ON_STARTUP or INCOMING_ONLY and the
connection is not currently established then no services will be routed to
that remote domain.
Q5: What support features are available in WTC?
A5: WTC has a tracing feature which can be enabled dynamically. If a
customer reports a problem, support will likely ask the customer to turn
tracing on and send a log file. This tracing facility has several levels of
severity and can also help debug WTC applications. It is turned on by
setting TraceLevel in the WTC startup class. The following are the defined
levels:
10000 - TBRIDGE Input/Output
15000 - TBRIDGE extra information
20000 - Gateway Input/Output (this will trace the ATMI verbs)
25000 - Gateway extra information
50000 - JATMI Input/Output (this will trace the low-level jatmi calls)
55000 - JATMI extra information
60000 - CORBA Input/Output (this will trace CORBA calls)
65000 - CORBA extra information
Q6: Will Jolt be deprecated?
A6: No. There are some features of Jolt that are not covered by WTC. For
example, the Jolt registry API are not supported by WTC. Furthermore WTC
must run in conjunction with WLS, while Jolt can be run from Applets or from
free-standing Java applications.
Q7: What about JCA? Is WTC a JCA adapter?
A7: WTC is not a JCA adapter. JCA does not define semantics for inbound
invokations into the JCA container, but WTC allows for Tuxedo clients to
invoke WLS EJBs. However, the jATMI object interactions are based on the
JCA client model. BEA is currently evaluating several JCA strategies for
connections into Tuxedo.
John Wells (Aziz)
[email protected]
[email protected]

Q8. What versions of Tuxedo are supported?
A8. WTC 1.0 will support Tuxedo 6.5 and Tuxedo 8.0. WTC 1.1 (which adds
CORBA support) will support Tuxedo 6.5 and Tuxedo 8.0. Soon after the
release of both of these products we will certify WTC with Tuxedo 7.1.
However, the version of Tuxedo 7.1 you will need to have will be Tuxedo 7.1
after a certain patch level, which I don't know the number of yet. I will
attempt to keep the public informed about which patch level will be required
in Tuxedo 7.1
Q9. What WLS Releases will be supported?
A9. WTC 1.0 will be certified on WLS 6.0 SP2, WTC 1.1 will be bundled with
WLS SilverSword release (6.1?)
Q10. How will WTC be packaged?
A10. WTC 1.0 will be a separately downloaded binary (one for unix, one for
NT) that the user will have to install and configure in his/her WLS
environment. (Configuration will consist of putting the jatmi.jar file into
the classpath (as well as the normal BDMCONFIG configuration, of course)).
WTC 1.1 will be bundled right in there with the WLS SilverSword release.
Q11. When will WTC go live (no more beta)?
A11. This is a question for Jeff Cutler, but my impression is that WTC 1.0
will be shipped in the same time-frame as the Tuxedo 8.0 release and
obviously (see A10) WTC 1.1 will be shipped with WLS SilverSword.
John Wells (Aziz)
[email protected]

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See my User Tip for some help: Some Solutions for Resetting Forgotten Security Questions: Apple Support Communities
https://discussions.apple.com/docs/DOC-4551
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