Openejb :: container :: core framework and Java class library integration steps
Openejb is an open source project for building an application container. It is very convenient to integrate with the Java library.In this article, we will introduce steps for the OPENEJB CORE framework and Java class library integration, and provide some Java code examples.
Step 1: Introduce OpenEjb dependencies
First, you need to introduce OpenEjb dependencies in your project.You can use Maven or Gradle to manage dependencies. The following is a maven example pom.xml file:
<dependencies>
<dependency>
<groupId>org.apache.openejb</groupId>
<artifactId>openejb-core</artifactId>
<version>4.7.7</version>
</dependency>
</dependencies>
Step 2: Create an openjb container
Next, you need to create an openjb container to run your application.You can use the `EjbContainer` class to create a container.The following is a simple example:
import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
public class OpenEJBIntegrationExample {
public static void main(String[] args) {
EJBContainer container = EJBContainer.createEJBContainer();
Context context = container.getContext();
// Add your code here
container.close();
}
}
Step 3: Configure the OpenEjb container
You can configure the OpenEJB container by defining the EJB module and Bean scan in the `ejb-jar.xml` file.For example, the following is an example of a `ejb-jar.xml` file:
<ejb-jar xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/ejb-jar_3_2.xsd"
version="3.2">
<enterprise-beans>
<session>
<ejb-name>ExampleBean</ejb-name>
<ejb-class>com.example.ExampleBean</ejb-class>
<session-type>Stateless</session-type>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>ExampleBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
Step 4: Use OpenEJB container
Once you have created the OpenEjb container and configured the EJB module and bean, you can use them in the container.The following is an example of using the OpenEjb container:
import javax.ejb.embeddable.EJBContainer;
import javax.naming.Context;
public class OpenEJBIntegrationExample {
public static void main(String[] args) {
EJBContainer container = EJBContainer.createEJBContainer();
Context context = container.getContext();
ExampleBean exampleBean = (ExampleBean) context.lookup("java:global/ExampleBean");
String result = exampleBean.sayHello("World");
System.out.println(result);
container.close();
}
}
In the above example, we found an EJB called "ExampleBean" in the container and called its `Sayhello` method.You can call other EJB methods based on your actual needs.
Summarize
By following the above steps, you can integrate the OpenEjb Core framework with the Java class library to your application.By using the OpenEJB container, you can easily manage and call the EJB module and bean.I hope this article will help you understand OpenEjb and Java -class library integration!
