How to Modify the Tuxedo CORBA Simpapp Example

WLEC to Oracle WebLogic Tuxedo Connector Migration Guide

How to Modify the Tuxedo CORBA Simpapp Example

The following section provides an example of how to convert a WLEC application to use Oracle WebLogic Tuxedo Connector. This example provides information on the steps required to convert the WebLogic Server 6.1 examples\wlec\ejb\simpapp example to work using the Oracle WebLogic Tuxedo Connector. Review the Prerequisitesbefore proceeding.

How to Modify the Tuxedo Environment
Modify the ejb-jar.xml File
Update the build.xml File
Modify the WLEC ConverterBean
Configure Oracle WebLogic Tuxedo Connector
Run the simpapp Example

How to Modify the Tuxedo Environment

This section provides information on how to modify the Tuxedo configuration files to use with Oracle WebLogic Tuxedo Connector.

Run the Tuxedo CORBA Simpapp Example
Modify the UBB Configuration File
Create a Domain Configuration
Test the Tuxedo Environment

Run the Tuxedo CORBA Simpapp Example

You should run the Tuxedo CORBA simpapp example to verify your Tuxedo environment and prepare to run the WLEC simpapp application.
Use the following steps to run the Tuxedo example located at $TUXDIR/samples/corba/simpapp:
Create a working copy of the Tuxedo CORBA simpapp example. Copy the Tuxedo CORBA simpapp example from your Tuxedo installation and place it in your working simpapp directory.
Change directories to your working simpapp directory.
Build and run the example.
Set your Tuxedo environment. Windows users set %TUXDIR% in your shell environment. Unix users need to set the Tuxedo environment by running $TUXDIR/tux.env.
Make sure the C++ compiler is in your PATH.
Set the JAVA_HOME environment variable to the location of your Tuxedo Java JDK.
Set the environment by running the runme script. This will create the client stubbs that provide the programming interface for CORBA object operations. A results directory is created in your working directory that contains the files used to configure the Tuxedo environment.
Run the Java client.
java -DTOBJADDR=%TOBJADDR% -classpath %CLASSPATH% SimpleClient
Shutdown the Tuxedo server.
tmshutdown -y
Modify the UBB Configuration File

In your working Tuxedo simpapp directory, use the following steps to modify your UBB configuration:
Rename the results/ubb file in your working directory as results/ubbdomain.
Edit the ubbdomain file using a text editor, such as vi or WordPad.
Add Tuxedo gateway servers to the *SERVERS section.
Example: Add the following servers.
 DMADM SRVGRP=SYS_GRP SRVID=7

 GWADM SRVGRP=SYS_GRP SRVID=8

 GWTDOMAIN SRVGRP=SYS_GRP SRVID=9
Save the ubbdomain file.
The following code is an example of a modified ubbdomain file. Changed sections are marked in bold. Listing 3-1 Modified UBB File
*RESOURCES

 IPCKEY 55432

 DOMAINID simpapp

 MASTER SITE1

 MODEL SHM

 LDBAL N

*MACHINES

 "balto"

 LMID = SITE1

 APPDIR = "/tux_apps/corba/simpapp"

 TUXCONFIG = "/tux_apps/corba/simpapp/results/tuxconfig"

 TUXDIR = "/my_machine/tux/tuxedo8.1"

 MAXWSCLIENTS = 10

*GROUPS

 SYS_GRP

 LMID = SITE1

 GRPNO = 1

 APP_GRP

 LMID = SITE1

 GRPNO = 2

*SERVERS

 DEFAULT:

 RESTART = Y

 MAXGEN = 5

 TMSYSEVT

SRVGRP = SYS_GRP

 SRVID = 1

TMFFNAME

 SRVGRP = SYS_GRP

 SRVID = 2

 CLOPT = "-A -- -N -M"

TMFFNAME

 SRVGRP = SYS_GRP

 SRVID = 3

 CLOPT = "-A -- -N"

TMFFNAME

 SRVGRP = SYS_GRP

 SRVID = 4

 CLOPT = "-A -- -F"

simple_server

 SRVGRP = APP_GRP

 SRVID = 1

 RESTART = N



# The ISL handler is not needed for WTC.

# If you do not need it for other WLEC applications,

# it can be removed.

ISL

 SRVGRP = SYS_GRP

 SRVID = 5

 CLOPT = "-A -- -n //mymachine:2468 -d /dev/tcp"

DMADM

 SRVGRP = SYS_GRP

 SRVID = 7 

GWADM

 SRVGRP = SYS_GRP

 SRVID = 8 

GWTDOMAIN

 SRVGRP = SYS_GRP

 SRVID = 9 

*SERVICES
Create a Domain Configuration

In your working Tuxedo simpapp directory, use the following steps to create a domain configuration:
Create a domain configuration file using a text editor, such as vi or NotePad. The simplest method is to cut and paste the dmconfig code example into your editor.
Replace all <bracketed> items with information for your environment. Listing 3-2 dmconfig File
 *DM_RESOURCES

 VERSION=U22

 *DM_LOCAL_DOMAINS

 TUXDOM GWGRP=SYS_GRP

 TYPE=TDOMAIN

 DOMAINID="TUXDOM"

 BLOCKTIME=20

 MAXDATALEN=56

 MAXRDOM=89

 DMTLOGDEV="<Path to domain TLOG device>" 

 DMTLOGNAME="DMTLOG_TUXDOM" 

 *DM_REMOTE_DOMAINS

 examples TYPE=TDOMAIN DOMAINID="examples"

 *DM_TDOMAIN

 TUXDOM NWADDR="<network address of Tuxedo domain>"

 examples NWADDR="<network address of WTC domain>" 

 *DM_REMOTE_SERVICES
Save the file as dmconfig in your working simpapp/results directory.
Test the Tuxedo Environment

Use the following steps to validate your Tuxedo configuration:
In a new shell, change directories to your working simpapp/results directory.
Set the environment using the setenv script for your platform.
Load the ubbdomain file:
tmloadcf -y ubbdomain
.Load the dmconfig file:
set BDMCONFIG=<path_to_your_working_simpapp_example>/simpapp/results/bdmconfig

dmloadcf -y dmconfig
Boot the Tuxedo domain
tmboot -y
Verify the Tuxedo environment.
java -DTOBJADDR=%TOBJADDR% -classpath %CLASSPATH% SimpleClient
Shutdown the Tuxedo server.
tmshutdown -y
Modify the ejb-jar.xml File

Use a text editor such as Vi or Notepad to remove connection pool descriptors and update the trans-attribute. The following listing provides a code example on how to remove references to the IIOP connection pool descriptors in the WLEC simpapp example ejb-jar.xml.
Remove the env-entry attribute.
Set the trans-attribute in the container-transaction to Supports. As the example does not have a transaction, the container-transaction can not be Required. Listing 3-3 Example XML Configuration File for a CORBA Server Application
.

.

.

<ejb-jar>

<enterprise-beans>

<session>

 <ejb-name>ejb</ejb-name>

 <home>examples.wlec.ejb.simpapp.ConverterHome</home>

 <remote>examples.wlec.ejb.simpapp.Converter</remote>

<ejb-class>examples.wlec.ejb.simpapp.ConverterBean</ejb-class>

 <session-type>Stateless</session-type>

 <transaction-type>Container</transaction-type>



</session>

</enterprise-beans>

<assembly-descriptor>

<container-transaction>

 <method>

 <ejb-name>ejb</ejb-name>

 <method-intf>Remote</method-intf>

 <method-name>*</method-name>

 </method>

 <trans-attribute>Supports</trans-attribute>

</container-transaction>

</assembly-descriptor>

</ejb-jar>
Update the build.xml File

A build.xml file is presented below to simplify compiling and deploying your migrated application in the Weblogic environment. Use the following example code to replace the contents of the build.xml file. Listing 3-4 Updated build.xml file
<project name="wlec-ejb-simpapp" default="all" basedir=".">





<property environment="env"/>

<property file="../../../../examples.properties"/> 

<property name="build.compiler" value="${compiler}"/>

<property name="source" value="."/>

<property name="build" value="${source}/build"/>

<property name="dist" value="${source}/dist"/>

<property name="ejb_classes" value="Converter.java, ConverterHome.java, ConverterResult.java,

ProcessingErrorException.java, ConverterBean.java"/>

<property name="ejb_jar" value="wlec_simpapp_corba.jar"/>

<property name="client_classes" value="Converter.java, ConverterHome.java, ConverterResult.java,

ProcessingErrorException.java, Client.java"/>



<target name="all" depends="clean, init, compile_idl, compile_ejb, jar_ejb, appc, compile_client"/>



<target name="init">



 <tstamp/>

 

 <mkdir dir="${build}"/>

 <mkdir dir="${build}/META-INF"/>

 <mkdir dir="${dist}"/>

 <copy todir="${build}/META-INF">

 <fileset dir="${source}">

 <include name="*.xml"/>

 <exclude name="build.xml"/>

 </fileset>

 </copy>

 </target>





<target name="compile_idl">

 <exec executable="idlj" dir=".">

 <arg line="-td build -pkgPrefix Simple simple -pkgPrefix SimpleFactory simple simple.idl" />

 </exec>

 <javac srcdir="${build}" destdir="${build}"

 classpath="${CLASSPATH};${build}"/>

 <delete>

 <fileset dir="${build}">

 <include name="*.java"/>

 </fileset>

 </delete>

 </target>





<target name="compile_ejb">

 <javac srcdir="${source}" destdir="${build}"

 includes="${ejb_classes}"

 classpath="${CLASSPATH};${build}"/>

 </target>





<target name="jar_ejb" depends="compile_ejb">

 <jar jarfile="${dist}/std_${ejb_jar}"

 basedir="${build}">

 </jar>

 </target>





 <target name="appc" depends="jar_ejb">

<echo message="Generating container classes in ${apps.dir}/${ejb_jar}"/>

 <wlappc debug="${debug}"

 iiop="true"

 source="${dist}/std_${ejb_jar}"

 output="${apps.dir}/${ejb_jar}"

 />

 </target> 





 <target name="compile_client">

 <javac srcdir="${source}"

 destdir="${client.classes.dir}"

 includes="${client_classes}"

 />

 </target>



<target name="run">

<java classname="examples.wlec.ejb.simpapp.Client">

</java>

</target>



 <target name="clean">

 <delete dir="${build}"/>

 <delete dir="${dist}"/>

 </target>

</project>
Modify the WLEC ConverterBean

The following listing provides a code example on how to modify the wlec/ejb/simpapp example ConverterBean.java file to interoperate with Tuxedo using Oracle WebLogic Tuxedo Connector.
All changes are highlighted in bold and look like this: new code
Statements that are no longer needed are commented out using // and look like this: // old code Listing 3-5 Modified ConverterBean.java file
package examples.wlec.ejb.simpapp;



import javax.ejb.*;

import java.io.Serializable;

import java.util.*;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;



import org.omg.CORBA.*;

import com.beasys.Tobj.*;

import com.beasys.*;



/*These come from WebLogic Enterprise Simpapp sample */

//import SimpleFactory;

//import SimpleFactoryHelper;

//import Simple;

import simple.SimpleFactory;

import simple.SimpleFactoryHelper;

import simple.Simple;



/**

* ConverterBean is a stateless

* SessionBean.

* This bean illustrates:

* <ul>

* <li> Accessing ISL/ISH process and then a WebLogic Enterprise server

* <li> No persistence of state between calls to the SessionBean

* <li> Application-defined exceptions

* </ul>

*/

public class ConverterBean implements SessionBean {



static SimpleFactory simple_factory_ref;



// -----------------------------------------------------------------

// private variables

private SessionContext ctx;

private Context rootCtx;

private ORB orb;



// -----------------------------------------------------------------

// SessionBean implementation



/**

* This method is required by the EJB Specification,

* but is not used by this example.

*

*/

public void ejbActivate() {}



/**

* This method is required by the EJB Specification,

* but is not used by this example.

*

*/

public void ejbRemove() {}



/**

* This method is required by the EJB Specification,

* but is not used by this example.

*

*/

public void ejbPassivate() {}



/**

* Sets the session context.

*

* @param ctx SessionContext context for session

*/
 public void setSessionContext(SessionContext ctx) {

this.ctx = ctx;

}



// Interface exposed to EJBObject 



/**

* This method corresponds to the create

* method in the home interface ConverterHome.java.

* The parameter sets of these two methods are identical. When the client calls the

* ConverterHome.create method, the

* container allocates an instance of the EJBean and calls the

* ejbCreate method.

*

* @exception CreateException

* if there is an error while initializing the IIOP pool 

* @see examples.wlec.ejb.simpapp.Converter

*/

public void ejbCreate () throws CreateException {

try {

// try {

// Properties p = new Properties();

// p.put(Context.INITIAL_CONTEXT_FACTORY,

// "weblogic.jndi.WLInitialContextFactory");

// InitialContext ic = new InitialContext(p);

// rootCtx = (Context)ic.lookup("java:comp/env");

// }

//catch (NamingException ne) {

// throw new CreateException("Could not lookup context");

// }

 

// Initialize the ORB.

String args[] = null;

Properties Prop;

Prop = new Properties();

Prop.put("org.omg.CORBA.ORBClass",

"weblogic.wtc.corba.ORB");



orb = (ORB)new InitialContext().lookup("java:comp/ORB");



initIIOPpool();

}

catch (Exception e) {

throw new CreateException("ejbCreate called: " + e);

}

}



/**

* Converts the string to uppercase.

*

* @param mixed string input data

* @return ConverterResult conversion result

* @exception examples.wlec.ejb.simpapp.ProcessingErrorException

* if there is an error while converting the string

*/

public ConverterResult toUpper(String mixed)

throws ProcessingErrorException

{

return convert("UPPER", mixed);

}



/**

* Converts the string to lowercase.

*

* @param mixed string input data

* @return ConverterResult conversion result

* @exception examples.wlec.ejb.simpapp.ProcessingErrorException

* if there is an error while converting the string

*/

public ConverterResult toLower(String mixed)

throws ProcessingErrorException

{

return convert("LOWER", mixed);

}



protected ConverterResult convert (String changeCase, String mixed) 

throws ProcessingErrorException

{

String result;

try {

// Find the simple object.

Simple simple = simple_factory_ref.find_simple();



if (changeCase.equals("UPPER")) {

// Invoke the to_upper opeation on M3 Simple object

org.omg.CORBA.StringHolder buf = new org.omg.CORBA.StringHolder(mixed);

simple.to_upper(buf);

result = buf.value;

}

else

{

result = simple.to_lower(mixed);

}



}

catch (org.omg.CORBA.SystemException e) {

throw new ProcessingErrorException("Converter error: Corba system exception: " + e);

}

catch (Exception e) {

throw new ProcessingErrorException("Converter error: " + e);

}

return new ConverterResult(result);

}



// Private methods



/**

* Returns the WebLogic Enterprise Connectivity pool name.

*

* @return String IIOP pool name

*/

// private String getIIOPPoolName() throws ProcessingErrorException {

// try {

// return (String) rootCtx.lookup("IIOPPoolName");

//}

// catch (NamingException ne) {

// throw new ProcessingErrorException ("IIOPPoolName not found in context");

//} 

//}



/**

* Initializes an IIOP connection pool.

*/



private void initIIOPpool() throws Exception {

try {

// Create the bootstrap object,

// Tobj_Bootstrap bootstrap = // BootstrapFactory.getClientContext(getIIOPPoolName());



// Use the bootstrap object to find the factory finder.

// org.omg.CORBA.Object fact_finder_oref =

// bootstrap.resolve_initial_references("FactoryFinder") ;

org.omg.CORBA.Object fact_finder_oref =

 orb.string_to_object("corbaloc:tgiop:simpapp/FactoryFinder");



// Narrow the factory finder.

FactoryFinder fact_finder_ref =

FactoryFinderHelper.narrow(fact_finder_oref);



// Use the factory finder to find the simple factory.

org.omg.CORBA.Object simple_fact_oref =

fact_finder_ref.find_one_factory_by_id(SimpleFactoryHelper.id());



// Narrow the simple factory.

simple_factory_ref =

SimpleFactoryHelper.narrow(simple_fact_oref);



}

catch (org.omg.CosLifeCycle.NoFactory e) {

throw new Exception("Can't find the simple factory: " +e);

}

catch (CannotProceed e) {

throw new Exception("FactoryFinder internal error: " +e);

}

catch (RegistrarNotAvailable e) {

throw new Exception("FactoryFinder Registrar not available: " +e);

}

//catch (InvalidName e) {

// throw new Exception("Invalid name from resolve_initial_reference(): " +e);

//}

// catch (org.omg.CORBA.BAD_PARAM e) {

// throw new Exception("Invalid TOBJADDR=//host:port property specified: " +e);

// }

catch (org.omg.CORBA.UserException e) {

throw new Exception("Unexpected CORBA user exception: " +e);

}

catch (org.omg.CORBA.SystemException e) {

throw new Exception("CORBA system exception: " +e);

}

}

}
Configure Oracle WebLogic Tuxedo Connector

Use the following steps to configure Oracle WebLogic Tuxedo Connector to connect WebLogic Server and the modified WLEC application:

Create a WTC Service
Create a Local Tuxedo Access Point
Create a Remote Tuxedo Access Point
Create an Imported Service

Create a WTC Service

Use the following steps to create and configure a WTC service using the WebLogic Server Administration Console:

In the Administration Console, expand Interoperability and select WTC Servers in the navigation tree.
On the WTC Servers page, click New.
On the Create a New WTC Server page, enter My_WLEC_App to identify this configuration in the name field.
Click OK.
Your new WTC Service appears in the WTC Servers list.

Create a Local Tuxedo Access Point

When configuring the Network Address for a local access point, the port number used should be different from any port numbers assigned to other processes. Example: Setting the Network Address to //mymachine:7001 is not valid if the WebLogic Server listening port is assigned to //mymachine:7001.
Use the following steps to configure a local Tuxedo access point:

In the Administration Console, expand Interoperability and select WTC Servers.
On the WTC Servers page, click the name of a WTC Service to access the settings page.
Click the Local APs tab.
Enter the following values for the following fields on the WTC Local Access Points page:
In Access Point, enter My_Local_WLS_Dom.
In Access Point Id, enter examples.
In Network Address, enter the network address and port of the WebLogic Server environment that will host this local domain.
Example: //my_WLS_machine:5678
Click OK.

Create a Remote Tuxedo Access Point

Use the following steps to configure a remote Tuxedo access point:

In the Administration Console, expand Interoperability and select WTC Servers.
On the WTC Servers page, click the name of a WTC Service.
Click the Remote APs tab.
Enter the following values for the following fields on the WTC Remote Access Points page:
In Access Point, enter My_WLEC_Dom.
In Access Point Id, enter TUXDOM.
In Local Access Point, enter My_Local_WLS_Dom.
In Network Address, enter the network address and port of the Tuxedo environment that will host this remote domain.
Example: //my_TUX_machine:5678
Click OK.

Create an Imported Service

Use the following steps to configure an imported service:

In the Administration Console, expand Interoperability and select WTC Servers.
On the WTC Servers page, click the name of a WTC Service.
Click the Imported tab.
Enter the following values for the following fields on the WTC Imported Services page:
In Resource Name, enter //simpapp.
In Local Access Point, enter My_Local_WLS_Dom.
In Remote Access Point List, enter My_WLEC_Dom.
In Remote Name, enter //domain_id where domain_id is DOMAINID specified in the Tuxedo UBBCONFIG file. The maximum length of this unique identifier for CORBA domains is 15 characters and includes the //.
Example: //simpappff
Click OK.

Run the simpapp Example
Open a new shell and change directories to your working Tuxedo CORBA simpapp example.
Set environment variables.
NT\2000 users run the following command: results\setenv.cmd
Unix users run the following command: results\setenv.sh
Boot the Tuxedo domain
tmboot -y
Open a new shell and change directories to your WebLogic Server WLEC simpapp example.
Set environment variables. Update the following parameters:
NT/2000 users modify and run the setExamplesEnv.cmd. Unix users copy ./config/examples/setExamplesEnv.sh script to your WLEC simpapp directory, then modify and run the setExamplesEnv.sh script.

Copy the simple.idl file from the Tuxedo CORBA simpapp example to your WebLogic Server WLEC simpapp example.
Build the wlec_simpapp_corba.jar file using ant.
Enter the following command: ant
Use the WLS console to target My_WLEC_App to the server.
Run the client.
Enter the following command: ant run

The Java application generates the following output:
Beginning simpapp.Client...

Start of Conversion for: It Works

Converting to lower case: It Works

...Converted: it works

Converting to upper case: It Works

...Converted: IT WORKS

Removing Converter

End simpapp.Client...
If you have a problem running the example, use the WTC tracing feature. See Monitoring the Oracle WebLogic Tuxedo Connector.