Creating your first component

Start IntelliJ and create a new project. In the available options, you should see Talend Component.

Make sure that a Project SDK is selected. Then, select Talend Component and click Next.
The Talend Component Kit Starter opens.

Enter the project details. The goal here is to define the component and project metadata. Change the default values as follows:

Once the metadata is filled, select Add a component. A new screen is displayed in the Talend Component Kit Starter that lets you define the generic configuration of the component. By default, new components are processors,

Enter a valid Java name for the component. For example, Logger.

Select Configuration Model and add a string field named level. This input field will be used in the component configuration to enter additional information to display in the logs.

In the Input(s) / Output(s) section, click the default MAIN input branch to access its detail, and make sure that the record model is set to Generic. Leave the Name of the branch with its default MAIN value.

Repeat the same step for the default MAIN output branch.

Click Next and check the name and location of your project, then click Finish to generate the project in the IDE.

From your component project in IntelliJ, open a terminal and make sure that the selected directory is the root of the project. All commands shown in this tutorial are performed from this location.

Compile the project by running the following command: mvnw clean install.
The mvnw command refers to the Maven wrapper that is shipped with Talend Component Kit. It allows to use the right version of Maven for your project without having to install it manually beforehand. An equivalent wrapper is available for Gradle.

Once the command is executed and you see BUILD SUCCESS in the terminal, deploy the component to your local instance of Talend Open Studio using the following command:
mvnw talend-component:deploy-in-studio -Dtalend.component.studioHome="<path to Talend Open Studio home>"

Make sure the build is successful.

Open Talend Open Studio and create a new Job:

Save the job created earlier and close Talend Open Studio.

Back in IntelliJ open the LoggerProcessor class. This is the class where the component logic can be defined.

Look for the @ElementListener method. It is already present and references the default input branch that was defined in the Talend Component Kit Starter, but it is not complete yet.

To be able to log the data in input to the console, add the following lines:

//Log to the console
        System.out.println("["+configuration.getLevel().toUpperCase()+"] "+defaultInput);

@ElementListener
    public void onNext(
            @Input final Record defaultInput) {
        // this is the method allowing you to handle the input(s) and emit the output(s)
        // after some custom logic you put here, to send a value to next element you can use an
        // output parameter and call emit(value).

        //Log to the console
        System.out.println("["+configuration.getLevel().toUpperCase()+"] "+defaultInput);
    }

Open the Terminal again to compile the project and deploy the component again. To do that, run successively the two following commands:

Open Talend Open Studio again and go to the job created earlier. The new component is still there.

Add a tRowGenerator component and connect it to the logger.

Double-click the tRowGenerator to specify the data to generate:

Validate the tRowGenerator configuration.

Open the TutorialFamilyLogger component and set the level field to info.

Go to the Run tab of the job and run the job.
The job is executed. You can observe in the console that each of the 10 generated rows is logged, and that the info value entered in the logger is also displayed with each record, in uppercase.