Apache OFBiz Interview Questions (2024)

1. What is Apache OFBiz?

2. What is OFBiz component?

3. What are the different components available in Apache OFBiz?

4. How to create the plugin/component in Apache OFBiz?

5. How to run application in Apache OFBiz?

6. How to create custom Entities or Tables in database using Apache OFBiz?

7. How to add data in Entities or Tables in Apache OFBiz?

8. What is Events in Apache OFBiz?

9. Where in OFBiz is the DataResource Entity defined?

10. How to set an attribute default value as null in the service definition in OFBiz?

Q: What is Apache OFBiz?
Ans:

OFBiz is a Java-based web framework that includes an entity engine, a service engine, and a widget-based UI for rapidly prototyping and developing web applications.

Q: What is OFBiz component?
Ans:

An OFBiz component is a folder that contains a special xml file called ofbiz-component.xml that outlines the resources that the component will load and require. OFBiz is a collection of components.

Q: What are the different components available in Apache OFBiz?
Ans:

1. Framework components: These are lower level parts that give application components the technical layer and tools they need to function (data layer, business logic layer, transaction handling, data source pools, etc.); the functionalities they offer are typically those offered by any other development framework.
2. Application components have access to the services and tools offered by the framework components as well as the services published by other application components. Product, order, party, manufacturing, accounting, etc. are examples of typical business components that are needed for ERP applications and can be customized or enhanced.
3. Components for plugins: These components resemble those for apps, however they are made for specific applications, such as e-commerce, Google Base integration, eBay integration, etc.

Q: How to create the plugin/component in Apache OFBiz?
Ans:

Setting up a new custom component in the plugins directory of OFBiz is quite simple. Plugins are common parts of OFBiz that are located in the special purpose directory. Plugins can be downloaded from a maven repository or manually applied. We only need to perform the following command from the command line.

./gradlew createPlugin -PpluginId=ofbizExample

OR

./gradlew createPlugin -PpluginId=ofbizExample -PpluginResourceName=OfbizExample -PwebappName=ofbizExampleweb -PbasePermission=OFBIZPER`

1. pluginId: Required
2. pluginResourceName: This is optional, default is the Capitalized value of pluginId.
3. webappName: This is optional, default is the value of pluginId.
4. basePermission: This is optional, default is the UPPERCASE value of pluginId.

Q: How to run application in Apache OFBiz?
Ans:

1. Reload the data in OFBiz.

./gradlew loadAll ofbiz

2. Direct your browser to your application at https://localhost:8443/ofbiz as OFBiz restarts.
3. You'll have to log in (user: admin , password: ofbiz)

Q: How to create custom Entities or Tables in database using Apache OFBiz?
Ans:

We only need to supply entity definition in the $OFBIZ_HOME/plugins/OfbizExample/entitydef/entitymodel.xml file of our OfbizExample application to build custom Entities/Tables in the database. When we applied the Gradle task to setup component, this file structure was already configured. All we have to do is enter the entity definition, added one entity for employee as shown below

<?xml version="1.0" encoding="UTF-8"?>

<entitymodel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://ofbiz.apache.org/dtds/entitymodel.xsd">

    <title>Entity for Organization</title>
    <description>None</description>
    <version>1.0</version>

    <entity entity-name="OfbizEmp" package-name="com.ofbiz.techgeeknext" title="Employee Entity">
        <field name="empId" type="id"><description>primary Sequence Employee ID</description></field>
        <field name="name" type="name"></field>
        <field name="role" type="role"></field>
        <prim-key field="empId"/>
    </entity>

</entitymodel>

The entry of above entitymodel.xml file would already be present in $OFBIZ_HOME/plugins/ofbizDemo/ofbiz-component.xml file.

<entity-resource type="model" reader-name="main" loader="main" location="entitydef/entitymodel.xml"/>

To verify the entities or table generated or not, just re-start OFBiz and search in https://localhost:8443/webtools/control/entitymaint .

Q: How to add data in Entities or Tables in Apache OFBiz?
Ans:

We can add the data in the XML files located up in component's data directory at $OFBIZ_HOME/plugins/OfbizExample/data/OfbizEmpData.xml.

<?xml version="1.0" encoding="UTF-8"?>
<entity-engine-xml>
    <OfbizExample empId="1" name="TcehGeekNext-User" role="Admin"/>
    <OfbizExample empId="2" name="User2" role="Supervisor"/>
</entity-engine-xml>

Run./gradlew loadAll in the console, or load the entity xml directly by going to https://localhost:8443/webtools/control/EntityImport via the webtools.

Visit Entity Data Maintenance at https://localhost:8443/webtools/control/entitymaint when the data loading process is finished to verify entities.

Q: What is Events in Apache OFBiz?
Ans:

The methods used to interact with the HttpServletRequest and HttpServletResponse objects are events in Apache OFBiz. In contrast to services, these don't require definitions. These are accessed directly from the controller. Events are also helpful for adding unique server-side input parameter validations. We can still use events to call prebuilt services to conduct database actions.

Q: Where in OFBiz is the DataResource Entity defined?
Ans:

We can get the entry of service entity-name="DataResource" in datamodel/entitydef/content-entitymodel.xml.

Q: How to set an attribute default value as null in the service definition in OFBiz?
Ans:

We can just specify optional="true" without providing entry for default-value.

<service name="empService" engine="java" location="com.ofbiz.techgeeknext.EmployeeServices" invoke="" auth="true" transaction-timeout="10500">
    <attribute name="empDeskNumber" mode="IN" type="String" optional="true"/>
</service>