Jboss Module Slot

The JBoss Application Server is configured using various XML configuration files. JBoss must be shut down before editing any of these configuration files. If JBoss is running and these files are changed, JBoss will probably crash. JBoss also has a few configuration files that are formatted as .property files. You must ensure that the .property files are saved as UNIX text files on Linux or Solaris if you edit these files on Windows environments at any time.

• Jboss Module Slots
• Jboss-deployment-structure Module Slot
• Jboss Module Slot Machines

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. JBoss has a module 'sun.jdk' which is used to load the jdk classes. For some reason not all classes are referenced. In order to allow for the sun or com related jdk packages which are not getting loaded we need to register them under the 'sun.jdk' module. The easiest way to see which modules are dependent on javax.validation.api and force it to be included, even though it was excluded, is to search your.xml files in JBOSSDIRECTORY/modules for javax.validation.api, the modules that are dependent have something like that in module.xml. Rajendrapopuri October 28th, 2016 on 6:10 pm. Hi Jay, How to load application properties files in JBoss instances at run time? Currently I created a module under modules folder and placed application configuration properties folders in that folder. The module name (com.mysql) must match the directory structure for the module, excluding the slot name (main).Creating custom static modules can be useful if many applications are deployed on the same server that use the same third-party libraries.

For single-server installations, you may use jboss profile located at [appserver root] standaloneconfiguration as a template. For cluster installations, use jboss profile located at [appserver root] domain as a template.

It is recommended that you make a copy of the profile (all or standard) and make changes to the copied profile.

12.4.1 Modify the JBoss configuration

Perform the following steps to modify the JBoss configuration to customize JBoss for AEM forms.

• Modify domain.conf.bat file (windows)

• Modify jboss.cli.bat (windows)

• Modify domain.conf file (Linux and Solaris)

• Modify domain.xml file (Windows and Unix Both) Harley-davidson 675 folding poker table top.

• Modify host.xml file

• Modify EAR file class-loading isolation

• Modify the standalone.conf.bat file (Windows)

• Modify standalone.conf (Linux and Solaris)

12.4.1.1 Modify the domain.conf.bat file (Windows only)

1. Open the [appserver root] /bin/domain.conf.bat file in an editor.

2. Delete the text in bold in the following line and add the memory arguments for 64-bit JVM.

3. Add the following argument for 64-bit JVM:

4. (Optional) Modify JBoss Application Server to run in IPv6 mode as follows:

   • Locate and modify -Djava.net.preferIPv4Stack=false

   • Insert the string -Djava.net.preferIPv6Stack=true

   Note: If the application server log contains the following error on startup, remove the value for the IPv6 stack and set the IPV4 value back to true :

   '13:37:44,488 WARN [HANamingService] Failed to start AutomaticDiscovery java.net.SocketException: bad argument for IP_MULTICAST_IF: address not bound to any interface at java.net.PlainDatagramSocketImpl.socketSetOption(Native Method)at java.net.PlainDatagramSocketImpl.setOption(PlainDatagramSocketImpl.java:260)'

5. Save and close the file.

12.4.1.2 Modify the standalone.bat file (Windows only)

1. Open the [appserver root] /bin/standalone.bat file in an editor.

2. Modify the line immediately following rem Setup JBoss specific properties to set encoding to UTF-8:

1. (Optional) Modify JBoss Application Server to run in IPv6 mode as follows:

   • Locate and modify -Djava.net.preferIPv4Stack=false

   • Insert the string -Djava.net.preferIPv6Stack=true

   Note: If the application server log contains the following error on startup, remove the value for the IPv6 stack and set the IPV4 value back to true :

   '13:37:44,488 WARN [HANamingService] Failed to start AutomaticDiscovery java.net.SocketException: bad argument for IP_MULTICAST_IF: address not bound to any interface at java.net.PlainDatagramSocketImpl.socketSetOption(Native Method)at java.net.PlainDatagramSocketImpl.setOption(PlainDatagramSocketImpl.java:260)'

2. Save and close the file.

12.4.1.3 Modify jboss.cli.bat (windows)

1. Open the [JBoss_root]binjboss-cli.bat file for editing.

2. Add double-quotes (' ') to the text in bold in the following line:

3. Save and close the file.

12.4.1.4 Modify the domain.conf file (JBoss with Solaris 10, Red Hat 6.0, 64-bit only)

Solaris JDKs from Sun require an additional argument to use 64-bit features. Without this configuration change, the Sun JDK defaults to 32-bit support only. Black knight casino slot game.

1. Open the [appserver root] /bin/domain.conf file in an editor.

2. Locate the section starting with:

   if [ 'x$JAVA_OPTS' = 'x' ]; then

   Modify the section to look like:

   Note: Ensure that this entry appears as a single line in the domain.conf file.

3. (optional)Modify JBoss Application Server to run in IPv6 mode as follows:

   • Locate and modify -Djava.net.preferIPv4Stack=false

   • Add -Djava.net.preferIPv6Stack=true

4. Save and close the file.

12.4.1.5 Modify domain.xml file (Windows and Unix)

1. Open the [JBoss_root]/domain/configuration/domain_.xml file for editing.

2. Add the following system properties as a child of the node:

3. The domain.xml file contains four profiles such as default , ha , full , and full-ha . AEM forms on JEE configured on a Cluster for JBoss application server required only full profile. Search and delete the following nodes:

4. To add and update logging properties:

   1. In the node , set the value of the child node to false .

   2. Add the following code after the node.

   3. Add the following code as the child of the node

5. Locate the following text and add/change the value that appears in bold to 100:

6. locate the node, replace the child node with

7. Locate the node

   and add the following lines after it.

8. Locate the following text and remove the text that appears in bold:

9. In the node, locate the child node . In the child node, after the line PAGE , add the following text:

10. In the node, remove the value that appears in bold:

11. Add the following lines as a child of the node:

12. Locate and delete all the child nodes of all the nodes for all the profiles.

13. Locate and replace the child nodes of the nodes for all the profiles to

14. Locate and delete all the child nodes of the node for all the profiles.

15. Locate and delete all the child nodes of the node for all the profiles.

16. Delete the following childs of the node:

17. Change the heap size from to .

18. Change the prem size from to .

19. Save and close the file.

12.4.1.6 Modify the host.xml file

1. Open the [JBoss_root]/domain/configuration/hosts.xml file for editing.

2. Illegal gambling machines in california now. Locate the node and change the values in bold:

3. Locate the node and delete the following child nodes:

4. Save and close the file.

12.4.1.7 Modify the modules.xml file

Jboss Module Slots

1. Open the module.xml file from the Program FilesEAP-6.2.0jboss-eap-6.2modulessystemlayersbasesunjdkmain directory for editing.

2. Add the following tags to the file in the tag:

3. Save and Close.

Hi,
AS 7 does classloading right. It uses JBoss Modules to provide true application isolation, hiding server implementation classes from the application and only loading the classes your application needs. Modules, packaged as collections of classes, are peers that remain isolated unless explicitly defined as a dependency of another module. Visibility rules have sensible defaults, yet can be customized.

Modular classloading is one of the greatest and amazing feature of JBossAS7, but some application server admins are not much aware of this new feature. So here we are going to see a practicle demo of creating a module on JBoss AS7.1.1.Final.

Few Points Which we are going to discuss here:

Point-1). How to create our own custom modules?

Point-2). What is the need of 'module.xml' and where to place it?

Point-3). What is 'slot' and Why and When to define 'slot' in our 'module.xml' file?

Point-4). How to reference a module inside our webapplication for classloading purpose?

Point-5). How and why to use the 'META-INF/jboss-deployment-structure.xml' or 'WEB-INF/jboss-deployment-structure.xml' file?

***NOTE*** This demo is also available in Github:
https://github.com/jaysensharma/MiddlewareMagicDemos/tree/master/JBossAS7_module_slot_Demo

Developing a Custom Module:

Step-1). Create a directory somewhere in your file system where we will develop our own custom Module with some different versions of class files. Suppose the directory is '/home/userone/CustomModuleTest'

Step-2). Now create a directories structure as 'aaa/bbb/1.0' and 'aa/bbb/main' inside the directory '/home/userone/CustomModuleTest'.

Step-3). Now write a class with name 'Test.java' inside '/home/userone/CustomModuleTest/aaa/bbb/1.0' as following:

Step-4). Similarly write a 'Test.java' program as following inside the directory '/home/userone/CustomModuleTest/aaa/bbb/main' :

***NOTE***: The class 'aaa.bbb.Test' is same as mentioned in Step3 and Step4 but there is a slight different in the implementation of these classes like the Version of the class is 1.0 and 1.2 as you can see in the static block of the code. This is just to demonstrate that how we can load any version of the same class inside our application with the help of 'slot' concept of JBoss Modules.

Step-5). Now we will need to write a file with name 'module.xml' inside the directory '/home/userone/CustomModuleTest/aaa/bbb/1.0' as following:

Step-6). Now we will need to write another file with name 'module.xml' inside the directory '/home/userone/CustomModuleTest/aaa/bbb/main' as following:

***NOTE*** If we have the same Jars of different versions defined as part of a module then the Jar which is present inside the 'main' directory of the module will be utilized by default until the application uses 'META-INF/jboss-deployment-structure.xml' or 'WEB-INF/jboss-deployment-structure.xml' to mention which 'slot' (version) it want to use.

Step-7). Now it's turn to compile the Test.java class. So open a shell prompt and then make sure that your PATH variable is set properly to point to the JDK bin directory as following:

Step-8). In the abobe shell prompt now move inside the directory '/home/userone/CustomModuleTest/aaa/bbb/main' to compile the Test.java program and to create a Test1.2.jar file as following:

Step-9). Similarly we wiill compile the Test.java present inside the '/home/userone/CustomModuleTest/aaa/bbb/1.0'. So in the abobe shell prompt now move inside the directory '/home/userone/CustomModuleTest/aaa/bbb/1.0' to compile the Test.java program and to create a Test1.0.jar file as following:

Step-10). Now just copy and paste your custom module directory 'aaa' directory placed inside the '/home/userone/CustomModuleTest' to destination directory '/home/userone/jboss-as-7.1.1.Final/modules'

Step-11). Now restart your JBossAS7 server as following:

Testing the Custom Module and it's slot:

Now we are going to develop a simple web application which will demonstrate how we can load the module, which has name 'aaa.bbb' inside our application. And how to load various versions of the same class 'aaa.bbb.Test' with the help of 'slot' using 'WEB-INF/jboss-deployment-structure.xml'

Step-12). Just create a WebApplication directory 'TestCustomModule.war' somewhere in your file system like inside '/home/userone/CustomModuleTest'

Step-14). Write the following kind of simple 'index.jsp' page inside our Web Application directory '/home/userone/CustomModuleTest/TestCustomModule.war'

Step-15). Create another directory 'WEB-INF' as '/home/userone/CustomModuleTest/TestCustomModule.war/WEB-INF' and then palce the following kind of 'web.xml' file inside it :

Step-16). Create another file with name 'jboss-deployment-structure.xml' inside '/home/userone/CustomModuleTest/TestCustomModule.war/WEB-INF', Now with the help of this file we will specify which version of the 'aaa.bbb.Test ' class we want to use in our application.

Step-17). Copy and paste the 'TestCustomModule.war' directory inside your JBossAS7 standalone deployment directory '/home/userone/jboss-as-7.1.1.Final/standalone/deployments'

Step-18). Now write a file with name 'TestCustomModule.war.dodeploy' inside the JBoss deployment directory '/home/userone/jboss-as-7.1.1.Final/standalone/deployments' to tell JBoss AS7 to deploy our application. (NOTE: as our application is Exploaded directory so we need to create this file otherwise war/jar/ear 'FILES' are automatically deployed without creating *.dodeploy file.)

Step-19). Access the application as 'http://localhost:8080/TestCustomModule/index.jsp' to see if your JSP file is able to access the 'aaa.bbb.Test' class or not? In the JBoss Console (command prompt output/STDOUT) you will see following kind of output.

Further Testing & Verification :

Step-20). At the time of application deployment based on the version of module which you mentioned in your 'jboss-deployment-structure.xml', If your module is loaded and deployed successfully then you will see a file with name 'Test1.0.jar.index' or 'Test1.2.jar.index' name inside the '/home/userone/jboss-as-7.1.1.Final/modules/aaa/bbb/1.0' or '/home/userone/jboss-as-7.1.1.Final/modules/aaa/bbb/main'

Step-21). Remove the 'slot=1.0' attribute in your '' file as following then redeploy your WebApplication then see access the same index.jsp page …. you will notice that now JBoss AS7 will load the 1.2 version of aaa.bbb.Text class as this is the default version.

Folllowing kind of output your will see now after redeployment of your application :

Jboss-deployment-structure Module Slot

Notice that this time a 1.2 version of aaa.bbb.Test class is loaded by JBoss.

Jboss Module Slot Machines

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Thanks 🙂
Middleware Magic Team