3983 cics java real life projects

© 2015 IBM Corporation

© IBM Corporation 2011

Java Real Live Projects

What do customers useJava for?

Tobias Leicher & Jürgen Sussner

2

Big Picture: Where to go with the CICS Development

Today (sample scenario)

System z

Cobol-Modules

New functions

How to implement?

DB2

How to use services of other

systems?

Hard to maintance/change?

App ServerExternal Systems

Java Modul

Modernisation

?

What can you expect

● Datev is one of my experienced customer in CICS

– And CICS Java on System z

● Beside the Experiences of Datev, I implemented several Projects with other Customers

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© DATEV eG, all rights

reserved

CICS Java Real Life Projects

Session: ASZ-3983 - Juergen Sussner DATEV e.G.

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Agenda

About DATEV

Our way to using java in CICS

Some of our projects

Bussinesrule Service

JAVA (de)Compression

Interface for OAM

Project BOES

Stumbling blocks

Conclusion

Vision for the future

10.02.2015

2

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About DATEV

The cooperative DATEV eG, Nuremberg, is a software company and IT

service provider for tax consultants, auditors and lawyers as well as their

clients

Founded 1966

Ca. 6.700 employees, 800 Mio. € turnover

4 computer centers in Nuremberg with

IBM System z (EC12) mainframes,

Power 6 & 7 AIX systems,

Approx. 7000 Linux and

Windows Server

Info: www.datev.com

10.02.2015

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Why Java in CICS

10.02.2015

4

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A short history A long time ago

10.02.2015

5

ISDN started

Task ISDN permission Check Engine

CICS Business Logic

Mainframe

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A short history A not so long time ago

10.02.2015

6

ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web

Application Business Rule Service (JAVA)

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What is this „Business Rule Service“?

10.02.2015

7

SOAP WebService for Access Control System

Computes permissions of a given user according to

User Credentials

User profile

Group memberships

Memberships in different contexts

Used as „central“ policy enforcement point

Creative Commons License

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A short history Close to now

10.02.2015

8

ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web


TCP/IP

Business Rule

Service (C)

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A short history The final complexity

10/02/2015

9

ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web


TCP/IP

Business Rule

Service (C)

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10/02/2015

10

ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web


TCP/IP

Business Rule

Service (C)

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10/02/2015

11

ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web


TCP/IP

Business Rule

Service (C)

Hard to maintain

Logic implemented twice

Performance issues

Many dependencies

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The Project “Business Rule Service” A closer look

10/02/2015

12 Creative Commons License

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The Project “Business Rule Service” Internal architecture

10/02/2015

13

Websphere /J2EE

Service

SOAP/ HTTP

JDBC Business-

Rule DB

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10/02/2015

14

Websphere /J2EE

Service

WebService

Skeleton SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

15

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

16

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

JNDI

Service

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

17

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

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Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

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Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

20

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

21

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

22

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

23

Websphere /J2EE

Service

WebService

Skeleton

POJO

Service

POJO

DAO

Spring

based

DAO

JNDI

Service

JDBC

Type 4

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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reserved


10/02/2015

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Websphere /J2EE

Service

POJO

Service

POJO

DAO

Spring

based

DAO

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

25

Websphere /J2EE

Service

Java Record

Framework

& Wrapper

POJO

Service

POJO

DAO

Spring

based

DAO

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

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Websphere /J2EE

Service

Java Record

Framework

& Wrapper

POJO

Service

POJO

DAO

Spring

based

DAO

Custom

JNDI

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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10/02/2015

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Websphere /J2EE

Service

Java Record

Framework

& Wrapper

POJO

Service

POJO

DAO

Spring

based

DAO

Custom

JNDI

JDBC

Type 2

SOAP/ HTTP

JDBC

WSDL

Business- Rule DB

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The Project Business Rule Service Steps for migration

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WAS - J2EE CICS JAVA

Use DFHWS2LS and J2C

Records

Create Main Class to map

from Container to Java

Replace JDBC Type4 with

Type2 Replace JNDI

Profiling and tuning to identify potential for optimization

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The Project Business Rule Service Final architecture based on pooled JVM

10/02/2015

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ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web

Application

TCP/IP

Business Rule Service (JAVA)

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The Project Business Rule Service Final architecture based on pooled JVM

10/02/2015

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ISDN started


CICS Business Logic

Mainframe

Websphere AIX

Web

Application

TCP/IP

Business Rule Service (JAVA)

easier to maintain

single Point of

implementation

performance Benefit

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The Project Business Rule Service Benefits from migration to JVM server

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Two possible migration paths:

“Fully OSGI compliant” vs. „Single bundle“ approach

Load- and Performance Test:

Less CPU time needed (larger parts zIIP eligible)

Slightly better response times

Even J2EE developers do not always write thread safe code;-)

Long time of testing and QA

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The Project Business Rule Service Some charts from production

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Some Statistics (03/2013)

10/02/2015

33 0

2000

4000

6000

8000

10000

12000

14000

16000

18000

05:3

0

05:4

6

06:0

2

06:1

8

06:3

4

06:5

0

07:0

6

07:2

2

07:3

8

07:5

4

08:1

0

08:2

6

08:4

2

08:5

8

09:1

4

09:3

0

09:4

6

10:0

2

10:1

8

10:3

4

10:5

0

11:0

6

11:2

2

11:3

8

11:5

4

12:1

0

12:2

6

12:4

2

12:5

8

13:1

4

13:3

0

13:4

6

14:0

2

14:1

8

14:3

4

14:5

0

15:0

6

15:2

2

15:3

8

15:5

4

16:1

0

16:2

6

16:4

2

16:5

8

17:1

4

17:3

0

17:4

6

CICS LINK

WebService

EXCI

Transactions per minute

2,7

0,4 0,6

Batch Job via EXCI

CICS Tasks via Link

Webservice Calls

Mio transactions per day

~ 3.700.000 transactions per day

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0

2000

4000

6000

8000

10000

12000

14000

16000

1800005:3

0

05:5

0

06:1

0

06:3

0

06:5

0

07:1

0

07:3

0

07:5

0

08:1

0

08:3

0

08:5

0

09:1

0

09:3

0

09:5

0

10:1

0

10:3

0

10:5

0

11:1

0

11:3

0

11:5

0

12:1

0

12:3

0

12:5

0

13:1

0

13:3

0

13:5

0

14:1

0

14:3

0

14:5

0

15:1

0

15:3

0

15:5

0

16:1

0

16:3

0

16:5

0

17:1

0

17:3

0

17:5

0

CICS Link

Webservice

EXCI

3,7

1,8

0,7

EXCI

Webservice

CICS Link



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10/02/2015

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0

2000

4000

6000

8000

10000

12000

14000

16000

1800005:3

0

05:5

0

06:1

0

06:3

0

06:5

0

07:1

0

07:3

0

07:5

0

08:1

0

08:3

0

08:5

0

09:1

0

09:3

0

09:5

0

10:1

0

10:3

0

10:5

0

11:1

0

11:3

0

11:5

0

12:1

0

12:3

0

12:5

0

13:1

0

13:3

0

13:5

0

14:1

0

14:3

0

14:5

0

15:1

0

15:3

0

15:5

0

16:1

0

16:3

0

16:5

0

17:1

0

17:3

0

17:5

0

CICS Link

Webservice

EXCI

3,7

1,8

0,7

EXCI

Webservice

CICS Link


2013

3,7 Mio

2015

6,2 Mio


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Infrastructure Scaling

10/02/2015

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Based on JVM Servers

For Workload via EXCI / from WAS (5.5 Mio TX per day)

6 CICS 4.2 CICS-regions

max 20 Threads and 512 MB per JVM Server

Daily peak load is handled by not more than 5 JVM threads in parallel

Memlimit: 20 GB per CICS-region

For CICS local workload (0.7 Mio TX per day)

1 JVM Server per region


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The project (de)Compression

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The project (de)Compression Motivation

Enable usage of compression in C or Cobol programs

Utilize JAVA compression capabilities

Provide a wide variety of compression algorithms

gzip

Multi-File archives

PKZIP

Compress VSAM entries in KSDS

Deflate / Inflate

…

Extensible for new algorithms 10/02/2015

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The project Compression Architecture

10/02/2015

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JVM Server

Channel OPERATION

PARAMETER

DATA

Main

Method

GZIP

GUNZIP

ZIP

DEFLATE

…

Channel OPERATION

PARAMETER

DATA

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The project Compression Statistics

10/02/2015

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0

500

1000

1500

2000

5:0

0

5:4

8

6:3

6

7:2

4

8:1

2

9:0

0

9:4

8

10:3

6

11:2

4

12:1

2

13:0

0

13:4

8

14:3

6

15:2

4

16:1

2

17:0

0

17:4

8

18:3

6

19:2

4

20:1

2

21:0

0

21:4

8

22:3

6

23:3

5

GZIP; 340

PKZIP; 295

GUNZIP; 162

GZIP

PKZIP

GUNZIP

1000 transactions per day


~ 800.000 transactions per day

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The Project BOES A data migration task

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The Project BOES Initial Situation

Existing business code implementation

Used in dozens of J2EE Applications

Implemented via EJB and JPA

Should be reused in a zOS/CICS Project

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Websphere Application Server

J2EE Application

SOA Core

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The Project BOES The generative Approach

1. Implement service

description

2. Implement business code

3. Generate application code

4. Runtime takes care about

connectivity to service

endpoint. 10/02/2015

43

Service

Description

(DSL)

Business

Code

(Java)

Application

Code

Runtime

Framework

WAS

Application

CICS

Application

Gen

era

tor

EJB

JAX

WS

HT

TP

CIC

S L

ink

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The Project BOES Where we end up

10/02/2015

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The same business code runs in CICS and in WAS

Can be used in BATCH

Foundation for many other projects

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The Project BOES Some highlights

10/02/2015

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Generative approach

80%

of the code is generated.

A developer does not need

to know the platform he

implements for

Less error prone due to

strict framework

Continuous integration

Completely buildable via

Apache Maven

Each build is conducted in a

clean and consistent

environment and does

automatic checks for code

quality, known bugs, unit

tests, generation of

documentation, and many

more

Client generation

Automatically generated

clients are:

WAS:

- JAXWS

- Remote EJB

- Direct Java Call

CICS Link:

- Cobol Copy Book

- Assembler DSect

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The project „Interface for OAM“

10.02.2015

46


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The project „Interface for OAM“ Motivation

Provide a simple, easy to maintain and uniform interface for storing,

archiving and retrieving Files

Enable usage of IBM OAM for various clients

Batch jobs

CICS transactions

WebSphere applications via CTG

Windows Applicaitons

10/02/2015

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The project „Interface for OAM“ Motivation

Developed in a „Java only“ department

Calls an Assembler module via LINK, which utilizes OAM Assembler

Macros

Already used in WebSphere applications & batch jobs and more to come.

Currently maintained by CICS - Administration 10/02/2015

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Stumbling blocks

10/02/2015

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The Porta Rosa is a Greek street dating from the 3rd to 4th century BC Creative Commons License

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Stumbling blocks Java agent and boot delegation

10/02/2015

50

CICS Region

Application

1

Application

3

Application

2

Monitoring

Agent

Scenario:

Usage of monitoring agents without

declaring it as an OSGI dependency !

org.osgi.framework.bootdelegation=<agent Package>

CICS 4.2

osgi.compatibility.bootdelegation=true

org.osgi.framework.bootdelegation=<agent Package>

CICS 5.2

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Stumbling blocks Deadlock when linking from Java to Java

10/02/2015

51

JVM Server

Threadlimit 10

Application

1

Application

2

Link

Message Queue Trigger

Carefully tune

threadlimits !

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Stumbling blocks Single connection vs. WAS nested transactions

10/02/2015

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[ jcc][50053][12310][4.15.105] T2zOS exception:

[ jcc][T2zos]com.ibm.db2.jcc.t2zos.T2zosConnection.initialize:

Multiple Connections are disallowed in current pre-existing

attachment environment ERRORCODE=-4228,

SQLSTATE=null

WAS developers usually don‘t care much about the number of

physical connections they use !

In CICS they have to !

Often caused by using nested transactions

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Stumbling blocks ThreadLocal and the leaking memory

10/02/2015

53

Happens within a sample shipped with CICS

com.ibm.cics.samples.SJMergedStream

JVM Server

Task

1

Task

2

Task

n

Thread Data

Task1 <data>

Task2 <data>

… <data>

Task n <data>

JVM Memory

Each transaction gets a new JVM

thread

Memory is not always cleaned up

properly

JVM is leaking Memory untill

OutOfMemory

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Conclusion

10/02/2015

54

+ Most young developers at DATEV prefer Java instead of COBOL/C

+ Java in CICS and Batch opens the world of mainframe programming to

many J2EE developers

+ To minimize response times, it could make sense to move data-intensive

applications close to the data (DB2, VSAM).

+ The power and simplicity of JAVA can be quite easily leveraged by classic

CICS Programs

Many problems from the distributed world have been also ported

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Vision for the future

10/02/2015

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Vision for the future Challenges

10/02/2015

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Isolated Applications Application specific

tuning

Portable Applications

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Vision for the future The plan

10/02/2015

57

Applications are developed compliant to specific J2EE profiles (e.g. WEB

Profile, Full Profile, …)

Many individual WAS Liberty servers configured and tuned to application

needs

System operations can decide on which platform the application will run

Coequal runtime platforms based on WAS Liberty

CICS on zOS

AIX

Linux

Windows

….

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Batch Java Project

zOS

CICSCalling Program

JVM Server (DFH#OSGI)

DU055COMMAREA(Interface for DU055)

01 DFH-COMMAREA05 DATUM PICX (?)05 ZEIT PICX (?)05 OPCODE PICX (?)05 VERSION PICX (?)05 RETURN-CODE PICX (4)05 LAENGE PICX (5)05 DATENSATZ PICX (?)

EXCI Accessmodule

Initializes Commareawith needed Values

DU055Initializes Input Objects

with Data from theCOMMAREA and calls the Kernprüfung and copies theReturncode in COMMAREA

KernprüfungThe actual Business Logic

that checks the data

Other Projects

● AXIS2 Web Services running in JVM Server

● JAX WS Services running in Liberty

● Using JSON Feature Pack in COBOL

● ...

The Goal

Possible Target SzenarioToday (sample scenario)

System z

Cobol-Modules

New functions

How to implement?

DB2

How to use services of other

systems?

Cobol-Modules

New functions realised with Java

DB2

Java-Modules

Hard to maintance/change?

System z

Efficient programming

model

Reduced maintenance

costs

Standard interfaces

External Systems

Stepwise integration

Modernisation

Java Modul

Java Modul

© 2014 IBM Corporation7

IBMQuestions

Tobias Leicher

Client Technical Professional & zChampion

– CICS & CICS Tools

IBM Allee 1D-71139 Ehningen

Mobil: 0151 – 15 16 24 89Mail: [email protected]

Foto

VIELEN DANK FÜR IHRE AUFMERKSAMKEIT.

What’s next…

More of my sessions

#ASZ-3983: CICS Java Real-Life Projects, Featuring Datev

#ASZ-3978: Why Is Java So Different?: A Session for Cobol/PLI/Assembler Developers

#ASZ-5927: Meet the Experts of Generation z—Driving Innovation on the Mainframe

More Cloud sessions

#ASZ-2829: Liberté, Égalité, Fraternité—Viva the CICS and WebSphere Mini Revolution

#ASZ-6481: Java and CICS—A Perfect Match

#ASZ-1841: WebSphere Liberty Profile Support for Java Batch and the JSR-352 Specification, Featuring Sicoob

Collect a z Passport sticker here, and at…

@IBM_CICS slideshare.net/IBM_CICSfacebook.com/IBMCICS ibm.com/cics

WIN!

Get a lightning start: Key InterConnect 2015 sessions

#2829 Mon 2:00-3:00Liberté, Égalité, Fraternité—Viva the CICS and WebSphere Mini Revolution

#1670 Tue 3:30-4:30 IBM WebSphere Liberty z/OS Connect: A Technical Introduction

#4032 Wed 9:30-10:30 Meet the Winners of IBM’s Mainframe Mobile App Throwdown 2014

#6482 Thu 11:00-11:50 What is the Mainframe Mobile App Throwdown and How Do I Register? Register now at

ibm.biz/mmathrowdownand submit your app by April 12th

Mobilize your mainframe in our fun app-building contest for

z Systems clients & business partners!

The Mainframe Mobile App Throwdownis back for 2015!

http://ibm.biz/mmathrowdown

http://ibm.biz/mmathrowdown

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