Saturday, 27 July 2019

Spring boot Tutorial 11 - Change the default context path - Playlist

https://www.youtube.com/watch?v=M22H5lJMWZ0&list=PLmCsXDGbJHdhmafGP_iU9D3QWbqZkd6Qc

Spring boot - Configure Jetty Server using Maven | Spring Boot tutorial

Spring Boot with Jetty: The Ultimate Maven Setup Guide

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Why Switch from Tomcat to Jetty?

By default, Spring Boot comes with Tomcat as the embedded server. While Tomcat is excellent, many developers prefer **Jetty** for its lightweight nature and high scalability, especially in microservices environments. If you want a server that uses less memory and starts lightning fast, Jetty is your go-to choice!

Setting Up Jetty with Maven

Setting this up in your Maven project is surprisingly simple. You don't need to download anything manually; you just need to tell Maven how to handle the dependencies in your pom.xml file.

Exclude Tomcat: First, you must tell Spring Boot to ignore its default Tomcat dependency.
Add Jetty: Then, simply add the spring-boot-starter-jetty dependency to your file.
Let Maven Work: Save the file, and Maven will automatically download and configure Jetty for you.

Key Benefits for Beginners

For those just starting, using Jetty helps you understand how Spring Boot's "Modular" architecture works. It proves that you aren't stuck with defaults—you can customize your environment to be as efficient as possible. This is a crucial skill for any modern Java developer.

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The Magic Behind @SpringBootApplication

If you've ever started a Spring Boot project, you've seen the @SpringBootApplication annotation. It sits right at the top of your main class, but do you know what it's actually doing behind the scenes? In this tutorial, we unlock the secrets of this "mega-annotation" and show you how it automates your entire application setup.

A Powerful 3-in-1 Combo

The @SpringBootApplication annotation isn't just one thing—it's actually a combination of three critical Spring annotations. Here is the breakdown:

@SpringBootConfiguration: Marks the class as a source of bean definitions for the application context.
@EnableAutoConfiguration: The "magic" part! It tells Spring Boot to start adding beans based on classpath settings, other beans, and various property settings.
@ComponentScan: Tells Spring to look for other components, configurations, and services in the package where the class resides, allowing it to find and register your beans automatically.

Why Developers Love It

Before Spring Boot, setting up a Spring application required massive amounts of XML configuration or dozens of manual annotations. @SpringBootApplication simplifies everything into a single line of code, enabling Rapid Application Development and letting you focus on writing business logic instead of configuration.

Take Control of Your Java Apps

Understanding this annotation is the first step toward mastering the Spring Boot ecosystem. When you know how auto-configuration and component scanning work, you can build more efficient, cleaner, and more maintainable code. Stay tuned for more deep dives into Spring Boot essentials! Happy coding!

Spring Boot - Example of RESTful Web service with XML Response | Spring Boot tutorial

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Generating XML Responses in Spring Boot

While JSON is common, many enterprise integrations require data in XML format. In this tutorial, we "simplify" the process of configuring a Spring Boot RESTful Service to return XML responses instead of the default JSON.

Enabling XML Support

Spring Boot makes it surprisingly easy to switch formats. We walk you through the essential configurations to get your API producing XML content:

Dependency Management: Adding the jackson-dataformat-xml dependency to your pom.xml.
Produces Attribute: Using the produces field in @GetMapping to specify MediaType.APPLICATION_XML_VALUE.
Automatic Marshalling: How Spring Boot automatically converts your Java objects into a structured XML format.

Testing Your XML API

We use Postman to verify the output. You'll learn how to set the Accept header to application/xml and witness the server dynamically serving the correct format based on the client's request. This demonstration covers both single objects and lists of resources.

Professional Versatility

Being able to provide data in multiple formats makes your services much more flexible and enterprise-ready. This skill is vital for developers working on legacy system integrations or complex data-sharing platforms. Mastering XML responses in Spring Boot is a key milestone for any professional Java Developer.

📥 Download the Source Code!

The complete Java source code and PowerPoint presentation for this XML response tutorial are available! Check the download links in the YouTube video description above to get started.

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Mastering Spring Boot Deployment on External Tomcat

Transitioning from Spring Boot's embedded server to an external Tomcat instance is a common requirement for production-grade REST APIs. While embedded servers are great for speed, external servers offer centralized management and shared resources. This guide makes the switch simple and efficient.

Step 1: Packaging as a WAR File

To deploy to an external server, you must change your build packaging. In your pom.xml, update the <packaging> tag to war. This ensures Maven creates the correct file structure for Tomcat to read.

Step 2: Configure the Servlet Initializer

Your Spring Boot application needs a starting point that an external container can recognize. You’ll need to extend the SpringBootServletInitializer class in your main entry point. This small code adjustment bridges the gap between your app and the Tomcat server.

Step 3: Excluding Embedded Tomcat

To avoid version conflicts, mark the spring-boot-starter-tomcat dependency as provided in your dependencies. This tells the build process not to include the server inside your WAR file, as the external Tomcat will already provide it.

Step 4: The Deployment Process

Once your WAR file is generated, copy it into the webapps directory of your standalone Tomcat installation. Tomcat will automatically detect the file, extract it, and deploy your REST endpoints in seconds.

Step 5: Testing Your REST Endpoints

Access your API by appending the WAR filename to your server URL, for example: http://localhost:8080/my-api-name/hello. If you see your REST response, your deployment was a success! You are now running Spring Boot like a pro.

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The Easy Way to Install Tomcat 9 on Windows

Apache Tomcat 9 is a powerful, open-source web server used by millions of developers to host Java-based web applications. While it might seem technical, installing it on Windows is actually quite simple when you follow the right steps. This guide will get your local server up and running in no time.

Step 1: Verify Java Installation

Before you even download Tomcat, you must have the Java Development Kit (JDK) installed on your Windows machine. Tomcat is written in Java and requires it to run. Open your Command Prompt and type java -version to make sure you're ready to go.

Step 2: Download the Tomcat 9 Installer

Head over to the official Apache Tomcat 9 download page. For Windows users, the easiest option is the "32-bit/64-bit Windows Service Installer" (the .exe file). This installer handles most of the configuration for you automatically.

Step 3: Run the Setup Wizard

Launch the downloaded installer and follow the prompts. During setup, you can choose which components to install (like the Manager GUI). You'll also be asked to specify the port—the default is usually 8080. Keep this in mind for later!

Step 4: Configure the Java Path

The installer will ask for the location of your JRE or JDK. It usually finds this automatically, but double-check that it points to the correct folder (e.g., C:\Program Files\Java\jdk-11) so Tomcat can launch without errors.

Step 5: Start and Test Your Server

Once the installation is complete, you can start the Tomcat service. Open your browser and go to http://localhost:8080. If you see the famous Tomcat "If you're seeing this, you've successfully installed Tomcat" page, congratulations! You're ready to deploy your apps.

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Mastering Context Paths in Spring Boot

By default, a Spring Boot application serves content from the root context path ("/"). However, in many real-world scenarios—especially when hosting multiple applications on a single domain—you need to define a custom context path. While many developers use property files, understanding how to do this programmatically gives you much more flexibility.

The Problem: Why Change the Context Path?

When your API grows, you might want to version it (e.g., /api/v1) or distinguish it from other services on the same server. Changing the context path ensures that your application only responds to requests starting with your specified prefix, preventing URL collisions.

Enter TomcatServletWebServerFactory

One of the most powerful ways to customize the embedded Tomcat server is through the TomcatServletWebServerFactory bean. By overriding this factory, you can programmatically inject configuration settings—including the context path—directly into the web server component during startup.

Step-by-Step Implementation

To implement this, you simply create a configuration class and define a WebServerFactoryCustomizer bean. Inside this bean, you can use the setContextPath() method to specify exactly where your application should live. This method is incredibly useful for dynamic configurations that might change based on environment variables.

The Property File Alternative

For simpler use cases, you can also use the server.servlet.context-path property in your application.properties or application.yml file. While less flexible than the programmatic approach, it is a quick and efficient way to handle static context path changes.

Testing Your Changes

After applying the change, restart your application. You'll notice that the root URL no longer works. You must now append your new context path to the URL (e.g., http://localhost:8080/my-app/). Your endpoints are now organized and ready for professional deployment!

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Wednesday, 10 July 2019

Spring boot Tutorial 06 - Spring boot web application

Spring boot Tutorial 06 - Spring boot web application:
https://www.youtube.com/watch?v=dwVpff6pg0s&list=PLmCsXDGbJHdhW_c5a6WiqRbMyYKZdmAgG

Thursday, 4 July 2019

Spring boot Tutorial 10 - Spring Boot - Schedule Task - Playlist

Spring boot Tutorial 10 - Spring Boot - Schedule Task - Playlist
https://www.youtube.com/watch?v=lT2x8N0ch5w&list=PLmCsXDGbJHdigIrpk4yIg1K4SSFrOGV6f

Spring boot Tutorial 09 - Spring Boot - Intercepting & Modifying HTTP Requests & Responses - Playlist

Spring boot Tutorial 09 - Spring Boot - Intercepting & Modifying HTTP Requests & Responses - Playlist
https://www.youtube.com/watch?v=Kf_cTErI2P8&list=PLmCsXDGbJHdihaYJ2itMBdYYMI_WlB7Ok

Spring Boot - How to schedule a task at a fixed delay? | Spring Boot - Schedule task

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Spring boot Tutorial 08 - Spring Boot - File Upload/Download - Playlist

Spring boot Tutorial 08 - Spring Boot - File Upload/Download - Playlist
https://www.youtube.com/watch?v=0QEW3vHujxM&list=PLmCsXDGbJHdiWbvo551MFCAmTtj3RX1iT

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Postman REST client - Playlist

Postman REST client - Playlist
https://www.youtube.com/watch?v=0QEW3vHujxM&list=PLmCsXDGbJHdgMPItAryvWY57tTr2FxCG8

How To Download And Install Postman REST client? | Software Testing Material

How to configure Logback in Spring boot application to print the log in the console and file?

How to configure Logback in Spring boot application to print the log in the file?

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Spring boot Tutorial 07 - Spring boot - logging | Logging in Spring boot - Playlist

https://www.youtube.com/watch?v=R_yOnue1jGk&list=PLmCsXDGbJHdhRdnwX3UQE4EcaErBTYqC8

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How does Maven work? | Apache Maven

How Does Maven Work? A Simple Guide for Beginners

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The Inner Workings of Apache Maven

Ever wondered what happens behind the scenes when you run a Maven command? It's like a well-oiled factory. Maven follows a specific set of rules and steps to turn your source code into a finished product, like a JAR or WAR file.

The Three Repositories

Maven doesn't just look for files on your computer. it uses a clever system of repositories to find exactly what your project needs:

Local Repository: This is a folder on your own machine where Maven stores everything it has downloaded before.
Central Repository: If Maven can't find a library locally, it goes to the "Central" hub on the internet to fetch it.
Remote Repository: Sometimes companies have their own private "vaults" for custom code that Maven can also access.

The Build Lifecycle

When you tell Maven to "build," it goes through a lifecycle. It starts by cleaning up old files, then compiles your code, runs tests to make sure everything works, and finally packages it up. Because this process is standardized, any developer can pick up your project and build it with a single command!

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Understanding Maven vs. Traditional Java Development

If you are just starting with Java, you might be wondering: "Why do I need Maven?" In this post, we break down the big differences between how developers used to build apps (the Traditional Approach) and how we do it today using the Maven Approach.

1. The Traditional Approach (The Old Way)

In the past, developers had to do everything manually. This included:

Searching for JAR files online.
Manually adding libraries to the project path.
Handling "Jar Hell" (conflicting versions of the same library).
Building and packaging the app using complex scripts.

2. The Maven Approach (The Modern Way)

Apache Maven simplifies the entire process. Instead of manual work, you use a pom.xml file to manage your project. Here’s why it’s better:

Automatic Dependencies: Just tell Maven what you need, and it downloads it for you.
Standard Project Structure: Every Maven project looks the same, making it easy for new team members to understand.
One-Command Builds: You can compile, test, and package your code with a single command.

Conclusion

Switching from a traditional approach to Maven is like moving from a manual bicycle to a modern car. It saves time, reduces errors, and lets you focus on what really matters: writing great code!

Saturday, 27 July 2019

Spring Boot with Jetty: The Ultimate Maven Setup Guide

Why Switch from Tomcat to Jetty?

Setting Up Jetty with Maven

Key Benefits for Beginners

More Expert Tech Guides

🍃 Master Spring Boot with Ram N Java!

The Magic Behind @SpringBootApplication

A Powerful 3-in-1 Combo

Why Developers Love It

Take Control of Your Java Apps

More Spring Boot Tutorials from Ram N Java:

🚀 Master Web Services!

Generating XML Responses in Spring Boot

Enabling XML Support

Testing Your XML API

Professional Versatility

📥 Download the Source Code!

Mastering Spring Boot Deployment on External Tomcat

Step 1: Packaging as a WAR File

Step 2: Configure the Servlet Initializer

Step 3: Excluding Embedded Tomcat

Step 4: The Deployment Process

Step 5: Testing Your REST Endpoints

More REST & Spring Boot Tutorials:

The Easy Way to Install Tomcat 9 on Windows

Step 1: Verify Java Installation

Step 2: Download the Tomcat 9 Installer

Step 3: Run the Setup Wizard

Step 4: Configure the Java Path

Step 5: Start and Test Your Server

More Essential Server Guides:

Mastering Context Paths in Spring Boot

The Problem: Why Change the Context Path?

Enter TomcatServletWebServerFactory

Step-by-Step Implementation

The Property File Alternative

Testing Your Changes

More Pro Spring Boot Guides:

Wednesday, 10 July 2019

Thursday, 4 July 2019

How Does Maven Work? A Simple Guide for Beginners

The Inner Workings of Apache Maven

The Three Repositories

The Build Lifecycle

Explore More from Ram N Java

🚀 Love Java & Development Tips?

Understanding Maven vs. Traditional Java Development

1. The Traditional Approach (The Old Way)

2. The Maven Approach (The Modern Way)

Conclusion

Check out more tutorials from Ram N Java:

Tutorials