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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Starwalt Vellore free website">
<meta name="generator" content="http://starwalt.in/">
<meta name="keyword" content="Starwalt is an Internet Company, We help you to develop your business in Online, Websites,Digital Marketing Services.">
<meta name="author" content="Santhosh">
<title>A to Z Resources for Students</title>
<!-- Bootstrap core CSS -->
<link href="vendor/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="css/blog-post.css" rel="stylesheet">
<link href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<script type=”application/ld+json”>
{ “@context” : “http://schema.org”,
”@type” : “Organization”,
”name” :”starwalt”,
”url” : “https://www.starwalt.in/”,
”sameAs” : ["https://www.facebook.com/Starwalt07”,
“https://www.linkedin.com/company/starwalt",
“https://www.twitter.com/starwaltcompany”,
“https://www.instagram.com/starwaltcompany”] }</script>
<script async custom-element="amp-auto-ads"
src="https://cdn.ampproject.org/v0/amp-auto-ads-0.1.js">
</script>
<script async custom-element="amp-ad" src="https://cdn.ampproject.org/v0/amp-ad-0.1.js"></script>
<script data-ad-client="ca-pub-4065690667803582" async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
<div class="container">
<a class="navbar-brand" href="#">Starwalt Company</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarResponsive">
<ul class="navbar-nav ml-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home
<span class="sr-only">(current)</span>
</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Services</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Contact</a>
</li>
</ul>
</div>
</div>
</nav>
<!-- Page Content -->
<div class="container">
<div class="row">
<!-- Blog Entries Column -->
<div class="col-md-8">
<h1 class="my-4">Spring Boot</h1>
<!-- Blog Post -->
<div class="card mb-4">
<div class ="cart-body">
<!-- start here-->
<ul>
<li>
<p><strong>@Required:</strong> It applies to the bean setter method. It indicates that the annotated bean must be populated at configuration time with the required property, else it throws an exception BeanInitilizationException.</p>
</li>
<li>
<p><strong>@Autowired:</strong> Spring provides annotation-based auto-wiring by providing @Autowired annotation. It is used to autowire spring bean on setter methods, instance variable, and constructor. When we use @Autowired annotation, the spring container auto-wires the bean by matching data-type.</p>
</li>
<li>
<p><strong>@Configuration:</strong> It is a class-level annotation. The class annotated with @Configuration used by Spring Containers as a source of bean definitions.</p>
</li>
<li>
<p><strong>@ComponentScan:</strong> It is used when we want to scan a package for beans. It is used with the annotation @Configuration. We can also specify the base packages to scan for Spring Components.</p>
</li>
<li>
<p><strong>@Bean:</strong> It is a method-level annotation. It is an alternative of XML <bean> tag. It tells the method to produce a bean to be managed by Spring Container.</bean></p>
</li>
<li>
<p><strong>@Component:</strong> It is a class-level annotation. It is used to mark a Java class as a bean. A Java class annotated with @Component is found during the classpath. The Spring Framework pick it up and configure it in the application context as a Spring Bean.</p>
</li>
<li>
<p><strong>@Controller:</strong> The @Controller is a class-level annotation. It is a specialization of @Component. It marks a class as a web request handler. It is often used to serve web pages. By default, it returns a string that indicates which route to redirect. It is mostly used with @RequestMapping annotation.</p>
</li>
<li>
<p><strong>@Service:</strong> It is also used at class level. It tells the Spring that class contains the business logic.</p>
</li>
<li>
<p><strong>@Repository:</strong> It is a class-level annotation. The repository is a DAOs (Data Access Object) that access the database directly. The repository does all the operations related to the database.</p>
</li>
<li>
<p><strong>@SpringBootApplication:</strong> It is a combination of three annotations @EnableAutoConfiguration, @ComponentScan, and @Configuration.</p>
</li>
</ul>
<h3 id="spring-mvc-and-rest-annotations">Spring MVC and REST Annotations:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#spring-mvc-and-rest-annotations" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h3>
<ul>
<li>
<p><strong>@RequestMapping:</strong> It is used to map the web requests. It has many optional elements like consumes, header, method, name, params, path, produces, and value. We use it with the class as well as the method.</p>
</li>
<li>
<p><strong>@GetMapping:</strong> It maps the HTTP GET requests on the specific handler method. It is used to create a web service endpoint that fetches It is used instead of using: @RequestMapping(method = RequestMethod.GET)</p>
</li>
<li>
<p><strong>@PostMapping:</strong> It maps the HTTP POST requests on the specific handler method. It is used to create a web service endpoint that creates It is used instead of using: @RequestMapping(method = RequestMethod.POST)</p>
</li>
<li>
<p><strong>@PutMapping</strong>: It maps the HTTP PUT requests on the specific handler method. It is used to create a web service endpoint that creates or updates It is used instead of using: @RequestMapping(method = RequestMethod.PUT)</p>
</li>
<li>
<p><strong>@DeleteMapping:</strong> It maps the HTTP DELETE requests on the specific handler method. It is used to create a web service endpoint that deletes a resource. It is used instead of using: @RequestMapping(method = RequestMethod.DELETE)</p>
</li>
<li>
<p><strong>@PatchMapping:</strong> It maps the HTTP PATCH requests on the specific handler method. It is used instead of using: @RequestMapping(method = RequestMethod.PATCH)</p>
</li>
<li>
<p><strong>@RequestBody:</strong> It is used to bind HTTP request with an object in a method parameter. Internally it uses HTTP MessageConverters to convert the body of the request. When we annotate a method parameter with @RequestBody, the Spring framework binds the incoming HTTP request body to that parameter.</p>
</li>
<li>
<p><strong>@ResponseBody:</strong> It binds the method return value to the response body. It tells the Spring Boot Framework to serialize a return an object into JSON and XML format.</p>
</li>
<li>
<p><strong>@PathVariable:</strong> It is used to extract the values from the URI. It is most suitable for the RESTful web service, where the URL contains a path variable. We can define multiple @PathVariable in a method.</p>
</li>
<li>
<p><strong>@RequestParam:</strong> It is used to extract the query parameters form the URL. It is also known as a query parameter. It is most suitable for web applications. It can specify default values if the query parameter is not present in the URL.</p>
</li>
<li>
<p><strong>@RequestHeader:</strong> It is used to get the details about the HTTP request headers. We use this annotation as a method parameter. The optional elements of the annotation are name, required, value, defaultValue. For each detail in the header, we should specify separate annotations. We can use it multiple time in a method</p>
</li>
<li>
<p><strong>@RestController:</strong> It can be considered as a combination of @Controller and @ResponseBody annotations. The @RestController annotation is itself annotated with the @ResponseBody annotation. It eliminates the need for annotating each method with @ResponseBody.</p>
</li>
<li>
<p><strong>@RequestAttribute:</strong> It binds a method parameter to request attribute. It provides convenient access to the request attributes from a controller method. With the help of @RequestAttribute annotation, we can access objects that are populated on the server-side.</p>
</li>
<li>
<p><strong>@EnableSwagger2:</strong> Mainly used for documentation the Restful we-service</p>
</li>
<li>
<p><strong>@EnableOAuth2Sso:</strong> Oauth Authentication</p>
</li>
</ul>
<h1 id="boot-starter-logging">Boot-starter-logging:</h1>
<ul>
<li>
<p>internal Logger -> Apache Commons Logging</p>
</li>
<li>
<p>private final Logger LOGGER = LoggerFactory.getLogger(this.getClass());</p>
</li>
<li>
<p>spring.output.ansi.enabled - always, detect or never</p>
</li>
<li>
<p>LOGGER.info(“Simple log statement with inputs {}, {} and {}”, 1,2,3);</p>
</li>
<li>
<p>Types -> logging, log4j, logback</p>
</li>
</ul>
LOGGER.debug(“This is a debug message”);
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>LOGGER.info("This is an info message");
LOGGER.warn("This is a warn message");
LOGGER.error("This is an error message");
</code></pre></div></div>
<h1 id="rest-request-validation-annotations">REST request validation annotations:</h1>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>@AssertFalse -> The annotated element must be false.
@AssertTrue -> The annotated element must be true.
@DecimalMax -> The annotated element must be a number whose value must be lower or equal to the specified maximum.
@DecimalMin -> The annotated element must be a number whose value must be higher or equal to the specified minimum.
@Future -> The annotated element must be an instant, date or time in the future.
@Max -> The annotated element must be a number whose value must be lower or equal to the specified maximum.
@Min -> The annotated element must be a number whose value must be higher or equal to the specified minimum.
@Negative -> The annotated element must be a strictly negative number.
@NotBlank -> The annotated element must not be null and must contain at least one non-whitespace character.
@NotEmpty -> The annotated element must not be null nor empty.
@NotNull -> The annotated element must not be null.
@Null -> The annotated element must be null.
@Pattern -> The annotated CharSequence must match the specified regular expression.
@Positive -> The annotated element must be a strictly positive number.
@Size -> The annotated element size must be between the specified boundaries (included).
</code></pre></div></div>
<h4 id="aop-annotation">AOP annotation:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#aop-annotation" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> * @Advice
* @before
* @order(0)
* @after
* @afterAdvice
* @beforeReturningAdvice
</code></pre></div></div>
<h4 id="junit-test-annotation">Junit Test annotation:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#junit-test-annotation" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code> * @BeforeClass
* @Before
* @Test
* @After
* @AfterClass
</code></pre></div></div>
<h4 id="arious-assest-statement">arious Assest Statement:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#arious-assest-statement" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>Void equals(boolean exptation, boolean Actual)
Void Notequals(boolean exptation, boolean Actual)
Void assertTrue(boolean condition)
Void assertFalse(boolean condition)
Void assertNull(Object object)
Void assertNotNull(Object object)
Void assertSame(Object object1,Object object 2)
Void assertNotSame(Object object1,Object object 2)
void assertArrayEquals(expectedArray, resultArray);
</code></pre></div></div>
<h4 id="data-in-lombok">@data in Lombok<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#data-in-lombok" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>* Will add all getter and setters
* To string
* Equal and barcode
</code></pre></div></div>
<p>@NOTnull</p>
<h4 id="web-app">Web App:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#web-app" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>* request
* response
* get
* post
* jsp
* jstl
* bootstrap
</code></pre></div></div>
<h4 id="spring-mvc">Spring mvc:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#spring-mvc" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>* dispatcher servlet
* view resolver
* model
* view
* validation
* form tags
</code></pre></div></div>
<h4 id="spring-boot">Spring Boot:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#spring-boot" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>* starterss
* Autoconfiguration
* Initializr
* actuator
* embedded servers
</code></pre></div></div>
<h4 id="external-config">External config:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#external-config" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<h4 id="msa">MSA:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#msa" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<ul>
<li>Collection of small autonomous</li>
<li>Small multiple services</li>
<li>All component seperate module</li>
<li>Stateless communication</li>
</ul>
<h4 id="advantage">Advantage:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#advantage" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<ul>
<li>easy to maintain</li>
<li>Continuous Delivery</li>
<li>Hybrid Technology -java csharp mysql</li>
<li>Cross Team coordination</li>
<li>Higher Quality code</li>
<li>Smarter Scaling</li>
<li>Risk Reduction -Seperation of services allowed for localized changes</li>
<li>Promote Big Data Best Practises</li>
<li>Improved ROI with Reduced TCO</li>
</ul>
<h2 id="microservices">Microservices:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#microservices" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h2>
<ul>
<li>
<p>Client Side load balancer - Ribbon</p>
</li>
<li>
<p>Distributed Tracking - Sluth and Zipkin</p>
</li>
<li>
<p>Fault Tolerance using Hystrix</p>
</li>
<li>
<p>Feign Client</p>
</li>
<li>
<p>Router and ZUUL</p>
</li>
<li>
<p>Service Registry using Eureka</p>
</li>
<li>
<p>Spring Cloud BUS</p>
</li>
<li>
<p>Spring Cloud Config</p>
</li>
</ul>
<h3 id="12factorapp-microservices">12FactorAPP-Microservices<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#12factorapp-microservices" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h3>
<ul>
<li>
<p>Codebase = One codebase tracked in revision control, many deploys - SVN</p>
</li>
<li>
<p>Dependencies = Explicitly declare and isolate dependencies - pom.xml</p>
</li>
<li>
<p>Config = Store config in the environment - DEV ,FET , ACC</p>
</li>
<li>
<p>Backing services = Treat backing services as attached resources</p>
</li>
<li>
<p>Build, release, run = Strictly separate build and run stages</p>
</li>
<li>
<p>Processes = Execute the app as one or more stateless processes</p>
</li>
<li>
<p>Port binding = Export services via port binding</p>
</li>
<li>
<p>Concurrency = Scale out via the process model</p>
</li>
<li>
<p>Disposability = Maximize robustness with fast startup and graceful shutdown</p>
</li>
<li>
<p>Dev/prod parity = Keep development, staging, and production as similar as possibe</p>
</li>
<li>
<p>Logs = Treat logs as event streams</p>
</li>
<li>
<p>Admin processes = Run admin/management tasks as one-off processes</p>
</li>
</ul>
<h4 id="properties-in-spring-boot">Properties in Spring Boot:<a class="anchorjs-link " href="https://sandysanthosh.github.io/SPRING-BOOT-MICROSERVICES/#properties-in-spring-boot" aria-label="Anchor" data-anchorjs-icon="" style="font: 1em / 1 anchorjs-icons; padding-left: 0.375em;"></a></h4>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>#MYSQL DB Properties
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/dbname
spring.datasource.username=root
spring.datasource.password=root
#JPA Properties
spring.jpa.hibernate.ddl-auto=update
spring.jpa.generate-ddl=true
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true
#Eureka Properties
eureka.client.register-with-eureka=true
eureka.client.fetch-registry=true
eureak.instance.hostnam=localhost
management.endpoints.web.exposure.include=*
eureka.client.serviceUrl.defaultZone = http://localhost:8761/eureka
spring.cloud.config.uri=http://localhost:8888
spring.rabbitmq.addresses=amqps://ailhzrhf:pnHKsJmZxwUZwUh_P7wEBiiD37BrfCnQ@finch.rmq.cloudamqp.com/ailhzrhf
Server:
Jetty
Spring jpa mysql security
security:
oauth2:
client:
clientId: a48f56f893775afb1912
clientSecret: c91036f105c04d0666655f411f716c43b606d373
accessTokenUri: https://github.com/login/oauth/access_token
userAuthorizationUri: https://github.com/login/oauth/authorize
clientAuthenticationScheme: form
resource:
user-info-uri: https://api.github.com/user
prefer-token-info: false
</code></pre></div></div>
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