There are various reasons why businesses choose to use CICS Transaction Gateway (CICS TG) in their environment.
In this blog I discuss three of them:
To act as a network concentrator
For intelligent routing
For offering simple, flexible solutions
As a Network Concentrator
Do you need to consolidate disparate systems and applications?
Do you want to protect your CICS resources?
Do you want to simplify your network?
If the answer to any of these... [More]
This article makes it easier for you to try out the examples in the new IBM Redbooks publication Cloud Enabling CICS (SG24-8114-00).
The IBM Redbooks publication explains how you can cloud enable your CICS environment with step-by-step incremental examples.
By following the steps you can:
Manage a CICS application as a single entity
Provide automated controls via CICS policies
Deploy and back-out application versions with no service downtime
And even deploy multiple versions... [More]
It's a well documented fact that the earlier a bug is discovered the easier it is to fix. One of the challenges of writing applications to run in CICS is that you have to have a region available for running the applications in. If this is then shared with other developers you can run into issues as only one remote debugger can be attached to a JVM server at any one time.
A potential solution is to write automated unit tests that run inside the development environment, but before we can do that we need to be able to use the JCICS APIs... [More]
Do you have Java applications running in pooled JVM? Are you considering the upgrade to CICS TS V5? If so then this article should help to smooth the migration of those applications.
The introduction of JVM server in CIC TS V4.2 offers a number of advantages over the existing pooled JVM implementation. The multi-threaded industry standard environment allows a single JVM within a CICS region to host all Java workload previously handled by a pool as well as the opportunity to consolidate multiple application regions. The OSGi framework... [More]
Have you been wondering where to get started with CICS applications, platforms and policy? Are you unsure whether the CICS cloud enablement capability in CICS TS V5 applies to your applications or environment? The recently released Cloud Enabling CICS redbook takes an existing 3270-COBOL-VSAM application and describes how to exploit these features including a fully worked example of how to use multi-versioning to safely and reliably apply and back-out application changes without service interruption. It also shows you how CICS... [More]
One of the advantages of using the latest version of CICS TG to provide mobile enablement of CICS programs is that we are not limited to using CICS Transaction Server, we can use any of the CICS family of transaction servers that are supported by CICS TG.
In this post I show how to create a RESTful API for customer data using the mobile support introduced in CICS TG V9.1, to invoke transactions on TXSeries. With this API a user can add, retrieve, update or delete a single customer record as well as getting a list of all the customer IDs... [More]
Java in CICS used to be a strange place. When I started working on CICS Transaction Server V3.1, having previously worked on WebSphere Application Server, I was frustrated to find an unusual Java environment inside CICS. It had strange options for its configuration and the idea that each CICS task had its own JVM (yes, a whole one) was baffling, and it didn’t understand Java threads. That was 10 years ago, but everything is different now.
The CICS JVM is a first-class enterprise Java environment. It’s so... [More]
Thanks to everyone who came to my Wednesday session “Managing Multi-version Applications in CICS” in Pittsburgh and especially to those who spent the time providing an evaluation. It was a really interactive session and the feedback helps the project plan what we should do at future meetings. As well as comments there were some questions that I have answered below for the benefit of the SHARE attendees and anyone else interesting in the application multi-versioning capability in CICS TS V5.2.
CICS Transaction Server V5.1 introduced the capability to combine and manage multiple disparate application resources as a single entity, which can be versioned and moved rapidly through the development, test, and production lifecycle. Dependency management is handled, and you can measure entire applications for resource use and internal billing. You can also dynamically manage applications by applying policies during run time.
CICS Transaction Server V5.2 builds on this functionality by introducing the concept of application... [More]
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If a customer finds a bug in your application, wouldn't it be great if you could build, test and deploy a fix in hours or days, rather than in weeks or months? Reducing turn-around time and aiming for continuous delivery allows your organization to constantly improve and evolve the applications and services provided to customers. There's no reason why your CICS-based applications and services shouldn't be included in the continuous delivery model.
Continuous integration and CICS
Let's say you have two... [More]
In our recent blog post about the new mobile support in CICS Transaction Gateway (CICS TG) we discussed how easy it was to create a new application to access existing CICS resources. In this blog post I'll show you how I put together a sample application which makes use of the programs and data provided by the the GENAPP support pac .
The architecture of the completed solution looks like
Setting up CICS TG
Configuring the Gateway daemon for http requests
To allow the Gateway daemon to receive and process http... [More]
CICS provides different levels of tracing to assist with problem determination. Standard trace level 1 is the default setting for each component to be traced within CICS. The user can use CETR to specify what trace levels are set for each component of CICS. By default, INTTR, SYSTR and USERTR are set ON. This means the master system and user trace flags default to be set on, and internal tracing is active. STNTR defaults to 1, as do all the STNTRxx values. This means standard trace component tracing defaults to level 1 for all CICS... [More]
One of the frequent questions we receive from customers is "How can I customize the CICS Explorer GUI, for instance by removing items that confuse my internal users?"
While removing GUI items is not something we provide support for, because CICS Explorer is built on top of Eclipse technology there is an Eclipse technique you can use to hide some elements of the GUI.
In this blog post I'll walk you through some using an activity to hide a GUI item, techniques for establishing whether a GUI item might be hideable, and... [More]
It's been a busy 18 months for the IBM CICS and Problem Determination Tools development teams, keeping pace with the latest and greatest in CICS TS for z/OS V5.2 and adding lots of new capabilities as well. New releases of five core CICS Tools plus an updated Solution Pack, together with enabling PTFs (where required) for PD Tools will help you to maximize the benefits from the latest run-time release. Don't worry if you are running an earlier release of CICS - most of the new capabilities will help you too.
Here's a... [More]
The CICS Transaction Gateway for z/OS V9.1 open beta includes new capabilities enabling HTTP clients to invoke COMMAREA or Channel-based CICS programs using JSON data, while benefiting from the established high availability and instrumentation features which CICS Transaction Gateway customers already rely upon.
Based upon the WS BIND data transformation technology and tooling already used for CICS Transaction Server web services, the proven reliability and scalability of CICS TG delivers further options for robust... [More]
Using JCA with the CICS TG in WebSphere Liberty Profile
The April betas of the WebSphere Liberty Profile provide an optional feature which enables support for the Java Connector Architecture (JCA) part of the Java Enterprise Edition (JEE) specification. As this has been one of the primary methods for connecting to CICS with the CICS TG, it made sense for me to check not only that it works in Liberty, but also how to make use of the CICS TG resource adapters from applications in a remote mode topology.
Getting the beta
This article describes how to deploy a Java application that uses the IBM MQ classes for Java into a CICS OSGi or Liberty JVM server
To follow the setup in this article you should already have performed the following:
S etup CICS to access MQ, this includes adding the correct datasets to the CICS region STEPLIB, and defining the MQCONN resource definition.
Installed the CICS Explorer V5.2 and added the WDT tools if developing Web applications.
Successfully created and started a JVM... [More]
Many of us have used CICS Explorer to manage CICS. But did you know that you can use the underlying CICS Management Client Interface (CMCI) from your browser (or any other HTTP client)? The CMCI request structure consists of
an HTTP header with a method (GET, PUT, POST, DELETE)
followed by a URI (Universal Resource Identifier) and
an optional XML body containing details of any changes to be made to CICS or CICSPlex SM resources
To try out the examples you need to know the hostname (called yourHostName in this... [More]