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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How to configure log4j2 in Spring boot application using log4j2 .properties? | Spring Boot logging

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Implementing Log4j2 in Spring Boot

Logging is an essential part of any application, and while Spring Boot uses Logback by default, many enterprise applications prefer Log4j2. Why? Because Log4j2 offers significant performance improvements, especially with asynchronous logging, and a more robust configuration system.

Why Switch to Log4j2?

Log4j2 is the successor to the classic Log4j and is designed to provide the best possible performance. It uses a LMAX Disruptor library for asynchronous logging, which means your application doesn't have to wait for the log message to be written to a file before continuing its work.

Quick Setup Guide

To get started, you first need to exclude the default logging starter and add the Log4j2 starter to your pom.xml:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
</dependency>

Simple Configuration

Place a file named log4j2-spring.xml in your src/main/resources folder. This is where you define how your logs should look and where they should be saved. Spring Boot will automatically pick up this file and apply your settings.

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The Ultimate Guide to Log4j2 in Spring Boot

Efficient logging is the backbone of any robust application. While Spring Boot provides excellent support for Logback by default, switching to Log4j2 is a popular choice for developers seeking better performance, advanced configuration options, and low-latency logging. In this guide, we'll walk through the process of setting up Log4j2 properly.

Why Choose Log4j2?

Log4j2 isn't just an update to the original Log4j; it's a complete rewrite that addresses many limitations. Some of the standout features include:

High Performance: Its asynchronous loggers offer much higher throughput than Logback.
Automatic Reconfiguration: It can reload its configuration file automatically when it changes, without restarting the app.
LMAX Disruptor Technology: Uses advanced data structures to minimize garbage collection overhead.

Configuring Log4j2 Step-by-Step

To implement Log4j2, you'll need to create a configuration file. Most developers prefer XML for its clarity and extensive feature support. You should place your log4j2-spring.xml file in the src/main/resources directory.

<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>

Summary

By following this ultimate guide, you can ensure your Spring Boot application has a world-class logging system that is both fast and flexible. Remember to always tailor your logging levels (INFO, DEBUG, ERROR) to match your environment's needs.

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Spring boot - Selecting profile configuration - YAML property file | Spring Boot tutorial

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Spring Boot Profiles with YAML

Managing different configurations for Dev, Test, and Production environments can be a nightmare. Thankfully, Spring Boot Profiles combined with YAML provides a clean, hierarchical way to handle environment-specific settings in a single file or multiple files.

Why Use YAML for Profiles?

Unlike traditional .properties files, YAML (YAML Ain't Markup Language) is more human-readable and allows for nested structures. This means you can keep your configurations organized without repeating long prefixes, making it much easier for beginners to understand and manage.

Setting Up Multi-Profile YAML

One of the most powerful features of YAML in Spring Boot is the ability to define multiple profiles within a single application.yml file using the --- separator.

spring:
  profiles:
    active: dev
---
spring:
  config:
    activate:
      on-profile: dev
server:
  port: 8081
---
spring:
  config:
    activate:
      on-profile: prod
server:
  port: 80

Key Takeaways

Using profiles ensures that your application behaves correctly regardless of where it is deployed. By mastering YAML configuration, you make your Spring Boot apps more flexible, professional, and easier to maintain.

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Mastering Logback with YAML in Spring Boot

Logging is a critical part of application development, helping you monitor behavior and debug issues. While Spring Boot uses Logback by default, configuring it via YAML offers a clean, readable, and structured alternative to traditional XML or properties files.

Why Use YAML for Logging?

YAML (YAML Ain't Markup Language) is favored for its hierarchical nature. It allows you to organize your console and file logging settings without the repetitive prefixes found in .properties files, making your configuration much easier to maintain as your project grows.

Setting Up Console & File Logging

With a few lines in your application.yml, you can control where your logs go, how they are formatted, and the level of detail recorded. Here is a simple example of how to enable both console and file logging:

logging:
  file:
    name: logs/app.log
  pattern:
    console: "%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"
    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"
  level:
    root: info
    com.ramnjava: debug

Key Takeaways

By centralizing your logging configuration in YAML, you gain better visibility into your application's health. This approach is highly recommended for modern Spring Boot applications, especially when moving toward cloud-native architectures.

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Understanding Logback Configuration via YAML

In modern Spring Boot development, YAML has become the preferred choice for configuration over traditional XML or properties files. This is especially true for logging setup with Logback, where the hierarchical nature of YAML makes the configuration much more readable and easier to manage.

Why Choose YAML for Logging?

Using application.yml for your logging setup allows you to see the relationship between different logging levels and appenders at a glance. It eliminates the repetitive prefixes found in .properties files, reducing the risk of errors and making your configuration "beginner-friendly."

Core Logging Concepts

When configuring Logback in YAML, you typically focus on three main areas:

Levels: Controlling the verbosity (INFO, DEBUG, ERROR, etc.) for specific packages.
Appenders: Defining where the logs go (Console, File, or even remote servers).
Patterns: Formatting how each log message looks (adding timestamps, thread names, etc.).

logging:
  level:
    root: info
    com.ramnjava: debug
  pattern:
    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"

Dive into Spring Boot: Discover All Loaded Beans by Class Type!

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Introduction to Spring Beans

If you're working with Spring Boot, you've likely heard of "Beans." In simple terms, a Bean is just an object that is managed by the Spring Framework. The Spring IoC (Inversion of Control) container is responsible for creating, configuring, and managing these beans throughout their lifecycle.

Why Find Beans by Class Type?

Sometimes, your application might have multiple implementations of an interface, or you just want to verify exactly which beans of a specific type are currently loaded in your ApplicationContext. Knowing how to filter and find these beans programmatically is a powerful debugging and configuration tool.

How it Works in Spring Boot

Spring provides the ListableBeanFactory interface, which allows you to fetch all beans that match a specific class or interface type. This returns a Map where the keys are the bean names and the values are the actual bean instances.

 Map<String, MyClass> beans = applicationContext.getBeansOfType(MyClass.class); 

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Spring Boot - CommandLineRunner and @Component Annotation | Spring Boot tutorial

Spring Boot Magic: CommandLineRunner & @Component Explained

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What is CommandLineRunner?

Think of CommandLineRunner as a special tool in Spring Boot that lets you run specific code right after the application starts up. It’s an interface that provides a single method: run(String... args). This is incredibly useful for tasks like pre-loading data into a database, checking system configurations, or simply logging a "Hello, System is Ready!" message.

The Power of @Component

The @Component annotation is like telling Spring Boot, "Hey, please manage this class for me!" When you mark a class with @Component, Spring automatically detects it during a component scan, creates an instance (a "Bean"), and puts it into the application context. Without @Component, your CommandLineRunner won't be picked up by Spring, and it won't execute!

How They Work Together

When you combine these two, you create a powerful startup routine for your app. Here’s a simple look at how the code structure usually looks:

 @Component
public class MyStartupTask implements CommandLineRunner {
    @Override
    public void run(String... args) throws Exception {
        System.out.println("Application has started! Running custom logic...");
    }
} 

Spring Boot - Multiple CommandLineRunner and @Order Annotation | Spring Boot tutorial

Mastering Spring Boot: Manage Multiple CommandLineRunners

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Handling Multiple Startup Tasks

In a real-world Spring Boot application, you often have more than one task that needs to run right after startup. Whether it's loading initial data, setting up a cache, or validating external services, you might find yourself with multiple classes implementing the CommandLineRunner interface.

The Importance of Execution Order

By default, Spring Boot doesn't guarantee the order in which these runners execute. If "Task B" depends on "Task A" being finished, you need a way to control the sequence. This is where the @Order annotation comes to the rescue. It allows you to specify exactly which runner goes first, second, and so on.

Step-by-Step Implementation

To force an order, simply add the @Order annotation to your component classes. The lower the number, the higher the priority (meaning 1 runs before 2).

 @Component
@Order(1)
public class FirstRunner implements CommandLineRunner { ... }

@Component
@Order(2)
public class SecondRunner implements CommandLineRunner { ... } 

Pro Tip: Safe Execution

Remember that if an exception is thrown inside a run() method and not caught, it will cause the entire ApplicationContext to close. Always wrap your startup logic in a try-catch block to ensure your application remains stable even if a startup task hits a snag.

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Introduction to Spring Boot

If you've ever felt overwhelmed by the complex configuration required for Java web applications, Spring Boot is here to save the day! Essentially, Spring Boot is an extension of the Spring framework that aims to simplify the initial setup and development of new Spring applications. It follows a "convention over configuration" approach, meaning it makes smart decisions for you so you can focus on writing code instead of managing XML files.

Why Developers Love It

The magic of Spring Boot lies in its Starter Dependencies and Auto-Configuration. Starters are sets of convenient dependency descriptors you can include in your application, which pull in all the necessary libraries for a specific task (like web development or data access). Auto-configuration automatically configures your Spring application based on the jar dependencies you have added.

Key Features for Beginners

Embedded Server: No need to install a separate web server like Tomcat; it's built right in!
Opinionated: It provides default configurations for many common tasks, getting you started in minutes.
Production-Ready: Includes built-in features like health checks and metrics via the Actuator.

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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.

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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.

Spring Boot + Spring MVC+ JSP Hello World Example | Spring Boot tutorial

Building a Hello World Web Application with Spring MVC and JSP

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The Basics of Spring MVC

Welcome back to Ram N Java! Today, we're diving into the heart of web development with Spring Boot by creating a classic "Hello World" application. We'll be using Spring MVC (Model-View-Controller), which is the standard design pattern for building flexible and loosely coupled web applications in Java. It separates the business logic (Model), the user interface (View), and the user input (Controller).

Why Use JSP with Spring Boot?

While modern web development often uses frontend frameworks, JavaServer Pages (JSP) remains a powerful and widely used technology for server-side rendering. JSP allows you to embed Java code into HTML pages, making it easy to display dynamic data. In this guide, we'll configure Spring Boot to recognize and serve these JSP files as our "View" layer.

Key Steps to Your First Web App

Project Setup: Start with Spring Initializr and include the 'Spring Web' dependency.
Controller Creation: Use the @Controller annotation to handle incoming web requests.
View Resolver: Configure your application properties to tell Spring where to find your JSP files (usually in /WEB-INF/jsp/).
Running the App: Fire up the embedded Tomcat server and view your result in the browser!

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Understanding the ApplicationContext

In the world of Spring Boot, the ApplicationContext is the engine that drives everything. It is the central interface to provide configuration information to the application. One of its primary jobs is to manage "Beans"—the objects that form the backbone of your application. But have you ever wondered exactly which beans are currently "alive" and managed by Spring at runtime?

Why List All Beans?

Listing all loaded beans is a fantastic debugging technique. Whether you're trying to figure out if your @Component was scanned correctly, or you want to see the various auto-configured beans Spring Boot has added for you, inspecting the context gives you a transparent look into your application's internals.

The Simple Implementation

The easiest way to see your beans is to fetch the ApplicationContext and call getBeanDefinitionNames(). This returns an array of all bean names, which you can then sort and print. Here is a quick look at how you might do this in a startup class:

 String[] beanNames = ctx.getBeanDefinitionNames();
Arrays.sort(beanNames);
for (String beanName : beanNames) {
    System.out.println(beanName);
} 

Spring Boot – How to deploy spring boot application on external Tomcat Server?

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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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How to install Tomcat 9 in windows operating system? | Tomcat 9 Installation | Tomcat

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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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Spring Boot – How to reload the changes without restarting the server?

Reloading Changes in Spring Boot: No Server Restart Required!

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The Problem: Constant Restarts

Are you tired of stopping and starting your Spring Boot server every time you make a tiny code change? It’s a major productivity killer! Waiting for the JVM to spin up repeatedly can add hours of wasted time to your development week. In this guide, we’ll show you how to eliminate those restarts and see your changes instantly.

Enter Spring Boot DevTools

The secret weapon is Spring Boot DevTools. This module is designed specifically to improve the development experience. Its most famous feature is Automatic Restart. Whenever a file on your classpath changes, DevTools detects the change and triggers a fast restart of the application context.

Why is it Faster?

DevTools uses a "two-classloader" strategy. One classloader handles the libraries that don't change (like the Spring framework itself), and another handles your project classes. When you make a change, only the project classloader is restarted, making the process significantly faster than a full cold start.

How to Enable It

Just add the following dependency to your pom.xml file, and Spring Boot takes care of the rest:

 <dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-devtools</artifactId>
  <optional>true</optional>
</dependency> 

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Understanding Spring Boot Configuration Priority

When building Spring Boot applications, managing configurations can get tricky. Did you know that Spring Boot looks for properties in multiple places? If you have the same setting in two different locations, Spring Boot follows a specific "Priority Order" to decide which one to use.

Why Priority Matters

Imagine you have a database password set in your code, but your boss wants to change it on the server without rebuilding the entire app. Because of Configuration Priority, you can override settings using Environment Variables or Command Line arguments easily!

The Common Order (Simplified)

Spring Boot generally checks these locations from highest priority to lowest:

Command Line Arguments: Anything you type when starting the app.
Environment Variables: System-level settings.
Application Properties: The files inside your project (like application.properties).

Pro Tip for Beginners

Always remember: external configurations (outside the JAR) usually win over internal ones. This makes your application flexible and ready for production!

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Setting Spring Boot Port and Context Path via Environment Variables

Ever wondered how to change your Spring Boot application's port or context path without touching a single line of code or property file? The secret lies in OS Environment Variables!

The Power of Environment Variables

When you move your application from your laptop to a server, you often need to change settings like the server port. Instead of hardcoding 8080, you can tell Spring Boot to look at the operating system's settings. This makes your app much more flexible and professional.

Key Variables to Know

SERVER_PORT: Changes the port your app runs on (e.g., 9090).
SERVER_SERVLET_CONTEXT_PATH: Sets the base URL for your application (e.g., /api/v1).

How it Works (Step-by-Step)

1. Set the variable in your Terminal or System Settings.
2. Launch your Spring Boot JAR file.
3. Spring Boot automatically detects these variables and applies them!

Why Use This Method?

It's the industry standard for Cloud and Docker deployments. It keeps your sensitive data safe and your builds clean!

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Easily Change Port and Context Path in Eclipse

Are you tired of manually changing application.properties every time you want to test your Spring Boot app on a different port? In this guide, we'll learn how to use Eclipse Run Configurations to make these changes on the fly!

Why Use Eclipse Run Settings?

Eclipse allows you to pass Arguments directly to your application when it starts. This is incredibly useful because:

It doesn't change your source code.
You can create different "profiles" for different testing scenarios.
It saves time by avoiding constant file edits.

Steps to Configure

To set your custom port and path, follow these simple steps:

Right-click your project and select Run As > Run Configurations...
Go to the Arguments tab.
In the VM Arguments box, add your settings like -Dserver.port=9090.
Click Apply and then Run!

Pro Tip for Beginners

Remember that VM Arguments must always start with -D. This tells Java that you are defining a system property that Spring Boot should pick up.

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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

🚀 Level Up Your Java Skills!

Implementing Log4j2 in Spring Boot

Why Switch to Log4j2?

Quick Setup Guide

Simple Configuration

More Logging Tutorials

🚀 Boost Your Java Coding Skills!

The Ultimate Guide to Log4j2 in Spring Boot

Why Choose Log4j2?

Configuring Log4j2 Step-by-Step

Summary

Watch More Spring Boot Tutorials

🚀 Master Spring Boot Today!

Spring Boot Profiles with YAML

Why Use YAML for Profiles?

Setting Up Multi-Profile YAML

Key Takeaways

Recommended Tutorials

🚀 Level Up Your Java Skills!

Mastering Logback with YAML in Spring Boot

Why Use YAML for Logging?

Setting Up Console & File Logging

Key Takeaways

More Spring Boot Tutorials

🚀 Master Spring Boot Today!

Understanding Logback Configuration via YAML

Why Choose YAML for Logging?

Core Logging Concepts

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Dive into Spring Boot: Discover All Loaded Beans by Class Type!

Introduction to Spring Beans

Why Find Beans by Class Type?

How it Works in Spring Boot

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What is CommandLineRunner?

The Power of @Component

How They Work Together

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Handling Multiple Startup Tasks

The Importance of Execution Order

Step-by-Step Implementation

Pro Tip: Safe Execution

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Introduction to Spring Boot

Why Developers Love It

Key Features for Beginners

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A Powerful 3-in-1 Combo

Why Developers Love It

Take Control of Your Java Apps

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Generating XML Responses in Spring Boot

Enabling XML Support

Testing Your XML API

Professional Versatility

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The Basics of Spring MVC

Why Use JSP with Spring Boot?

Key Steps to Your First Web App

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A Guide to Displaying All Beans in Spring Boot's ApplicationContext

Understanding the ApplicationContext

Why List All Beans?

The Simple Implementation

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Mastering Spring Boot Deployment on External Tomcat

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