In this article, we will show you how to do Spring Boot 2 integration test with JUnit 5, and also Mockito. Spring Boot 2.1.2.RELEASE JUnit 5 Mockito 2 Maven 3 In short, exclude junit4 from spring-boot-starter-test, and include the JUnit 5 jupiter engine manually, done. Let see the following Spring boot MVC web application, and […]
In this article, we will show you how to develop a reactive web application, using Server-sent events Spring Boot 2.1.2.RELEASE Spring WebFlux 5.1.4.RELEASE Thymeleaf 3.0.11.RELEASE JUnit 5.3.2 Maven 3 In Spring, returns JSON and header MediaType.TEXT_EVENT_STREAM_VALUE @RestController public class CommentController { @GetMapping(path = "/comment/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE) public Flux<Comment> feed() { //… } } In […]
Here we will create a Spring Boot web application example with Hibernate Search + Thymeleaf template engine, and deploy it as a WAR to Wildfly 10.1. Technologies used: Spring Boot 1.5.6.RELEASE Java 8 Hibernate Search 5.6.1.Final Embedded Tomcat, Wildfly 8.1 Final & 10.1 Final 1. Project Structure A standard Maven project structure 1. Project Dependencies […]
A Spring Boot Thymeleaf example, uses Spring Security to protect path /admin and /user Technologies used : Spring Boot 1.5.3.RELEASE Spring 4.3.8.RELEASE Spring Security 4.2.2 Thymeleaf 2.1.5.RELEASE Thymeleaf extras Spring Security4 2.1.3 Tomcat Embed 8.5.14 Maven 3 Java 8 1. Project Directory 2. Project Dependencies Declares spring-boot-starter-security, it will get anything you need to develop […]
In Spring Boot + Mustache template environment, if we didn’t assign a value to a {{variable}} on the Mustache’s page, the jmustache will throws the following error messages : com.samskivert.mustache.MustacheException$Context: No method or field with name ‘variable’ on line xx at com.samskivert.mustache.Template.checkForMissing(Template.java:316) ~[jmustache-1.13.jar:na] at com.samskivert.mustache.Template.getValue(Template.java:224) ~[jmustache-1.13.jar:na] at com.samskivert.mustache.Template.getValueOrDefault(Template.java:269) ~[jmustache-1.13.jar:na] P.S Tested with Spring Boot 1.5.2.RELEASE […]
A Spring Boot web application example, using embedded Tomcat + Mustache template engine, and package as an executable JAR file. Technologies used : Spring Boot 1.5.2.RELEASE Spring 4.3.7.RELEASE jmustache 1.13 Thymeleaf 2.1.5.RELEASE Tomcat Embed 8.5.11 Maven 3 Java 8 Note Spring Boot uses jmustache to integrate Mustache as template engine. 1. Project Directory 2. Project […]
In this article, we will discuss about “How to create a Spring Boot + Spring Data + Elasticsearch Example”. Tools used in this article : Spring Boot 1.5.1.RELEASE Spring Boot Starter Data Elasticsearch 1.5.1.RELEASE Spring Data Elasticsearch 2.10.RELEASE Elasticsearch 2.4.4 Maven Java 8 Note SpringBoot 1.5.1.RELEASE and Spring Data Elasticsearch 2.10.RELEASE supports only ElasticSearch 2.4.0. […]
Spring Boot makes it quick and easy to create a Spring based applications. *Spring Boot 4 minimum supported versions: Spring Framework 7.0.8 Java 17 (up to Java 26) Jakarta EE 11 (jakarta.*) Maven 3.6.3 or later Gradle 8.x (8.14 or later) and 9.x Spring Boot 4 supports the following embedded servlet containers: Tomcat 11.0, Servlet […]
In Spring Boot, it picks .properties or .yaml files in the following sequences : application-{profile}.properties and YAML variants application.properties and YAML variants Note For detail, sequence and order, please refer to this official Externalized Configuration documentation. Tested : Spring Boot 2.1.2.RELEASE Maven 3 1. Project Structure A standard Maven project structure. 2. @ConfigurationProperties Read the […]
In this article, we will show you how to use @Profile in Spring Boot and also how to test it. Tested with : Spring Boot 2.1.2.RELEASE Maven 3 1. Project Structure A standard Maven project structure. 2. Project Dependency pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <artifactId>spring-boot-profile</artifactId> <packaging>jar</packaging> <name>Spring Boot Profiles Example</name> […]
Run the Spring Boot integration test or unit test, many annoying DEBUG and INFO logs are displayed in the console. P.S Tested with Spring Boot 2 Console 2019-03-04 13:15:25.151 INFO — [ main] .b.t.c.SpringBootTestContextBootstrapper : 2019-03-04 13:15:25.157 INFO — [ main] o.s.t.c.support.AbstractContextLoader : 2019-03-04 13:15:25.158 INFO — [ main] t.c.s.AnnotationConfigContextLoaderUtils : 2019-03-04 13:15:25.298 INFO — […]
In Spring Boot + Spring Data JPA application, to support the JSR310 java.time.* APIs, we need to register this Jsr310JpaConverters manually. import org.springframework.boot.autoconfigure.domain.EntityScan; import org.springframework.data.jpa.convert.threeten.Jsr310JpaConverters; @EntityScan( basePackageClasses = {Application.class, Jsr310JpaConverters.class} ) @SpringBootApplication public class Application { //… } P.S Tested with Spring Boot 1.5.1.RELEASE, Spring Data JPA 1.11.0.RELEASE 1. Full Example 1.1 A model contains […]
In Spring Boot, you can use appContext.getBeanDefinitionNames() to get all the beans loaded by the Spring container. 1. CommandLineRunner as Interface Application.java package com.mkyong; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.ApplicationContext; import java.util.Arrays; @SpringBootApplication public class Application implements CommandLineRunner { @Autowired private ApplicationContext appContext; public static void main(String[] args) throws Exception { […]
In this article, we will show you how to create a Spring Boot + Spring Data MongoDB application, using Gradle build tool. Spring Boot 1.5.1.RELEASE MongoDB Gradle Java 8 1. Project Structure A standard project structure. 2. Project Dependency 2.1 A Gradle build file. build.gradle buildscript { repositories { mavenCentral() } dependencies { classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.1.RELEASE") } […]
Add the following lines in application.properties to log the Hibernate SQL query. application.properties #show sql statement logging.level.org.hibernate.SQL=debug #show sql values logging.level.org.hibernate.type.descriptor.sql=trace 1. org.hibernate.SQL=debug application.properties logging.level.org.hibernate.SQL=debug 1.1 Select query. Console 2017-02-23 21:36:42 DEBUG org.hibernate.SQL – select customer0_.id as id1_0_, customer0_.created_date as created_date2_0_, customer0_.email as email3_0_, customer0_.name as name4_0_ from customer customer0_ 2. org.hibernate.type.descriptor.sql=trace application.properties logging.level.org.hibernate.SQL=debug logging.level.org.hibernate.type.descriptor.sql=trace […]
In this article, we will show you how to create a Spring Boot + Spring Data JPA + Oracle + HikariCP connection pool example. Tools used in this article : Spring Boot 1.5.1.RELEASE Spring Data 1.13.0.RELEASE Hibernate 5 Oracle database 11g express Oracle JDBC driver ojdbc7.jar HikariCP 2.6 Maven Java 8 1. Project Structure A […]
In this article, we will show you how to create a Spring Boot JDBC application + Oracle database + Commons DBCP2 connection pool. Tools used in this article : Spring Boot 1.5.1.RELEASE Oracle database 11g express Oracle JDBC driver ojdbc7.jar Commons DBCP2 2.1.1 Maven Java 8 Note Related – Spring Boot JDBC + MySQL + […]
In Spring Boot, @Autowired a javax.sql.DataSource, and you will know which database connection pool is using in the current running application. 1. Test Default Spring Boot example to print a javax.sql.DataSource Note Read this official Spring Boot doc – Connection to a production database, to understand the algorithm for choosing a DataSource implementations – Tomcat […]
Here are few ways to disable the Spring logo banner below : . ____ _ __ _ _ /\\ / ___’_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | ‘_ | ‘_| | ‘_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || […]
Start a Spring Boot application and making a JDBC connection, hits the following warning messages on console : Fri Feb 10 18:43:02 SGT 2017 WARN: Establishing SSL connection without server’s identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn’t set. […]
In Spring Boot, to create a non-web application, implements CommandLineRunner and override the run method, for example : import org.springframework.boot.CommandLineRunner; @SpringBootApplication public class SpringBootConsoleApplication implements CommandLineRunner { public static void main(String[] args) throws Exception { SpringApplication.run(SpringBootConsoleApplication.class, args); } //access command line arguments @Override public void run(String… args) throws Exception { //do something } } 1. […]
In this article, we will show you how to create a Spring Boot JDBC application + MySQL and HikariCP. Tools used in this article : Spring Boot 1.5.1.RELEASE MySQL 5.7.x HikariCP 2.6 Maven Java 8 Note Related – Spring Boot JDBC + Oracle database + Commons DBCP2 example 1. Project Structure A standard Maven project […]
This article shows you how to replace the default Spring’s banner below with your custom banner. . ____ _ __ _ _ /\\ / ___’_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | ‘_ | ‘_| | ‘_ \/ _` | \ \ \ \ \\/ ___)| |_)| | […]
This article will show you how to use jQuery.ajax to send a HTML form request to a Spring REST API and return a JSON response. Tools used : Spring Boot 1.5.1.RELEASE Spring 4.3.6.RELEASE Maven 3 jQuery Bootstrap 3 Note You may interest at this classic Spring MVC Ajax example 1. Project Structure A standard Maven […]
This article shows you how to upload files in Spring Boot web application (REST structure), using Ajax requests. Tools used in this article : Spring Boot 1.4.3.RELEASE Spring 4.3.5.RELEASE Thymeleaf jQuery (webjars) Maven Embedded Tomcat 8.5.6 Google Chrome Browser (Network Inspect) 1. Project Structure A standard Maven project structure. 2. Project Dependency Declares an extra […]
In Spring Boot, you can’t configure the embedded Tomcat maxSwallowSize via the common application properties, there is no option like server.tomcat.*.maxSwallowSize Solution To fix it, you need to declare a TomcatEmbeddedServletContainerFactory bean and configure the maxSwallowSize like this : //… import org.apache.coyote.http11.AbstractHttp11Protocol; import org.springframework.boot.context.embedded.tomcat.TomcatConnectorCustomizer; import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory; private int maxUploadSizeInMb = 10 * 1024 * 1024; […]
This article shows you how to upload a file in Spring Boot web application. Tools used : Spring Boot 1.4.3.RELEASE Spring 4.3.5.RELEASE Thymeleaf Maven Embedded Tomcat 8.5.6 1. Project Structure A standard project structure. 2. Project Dependency Spring boot dependencies, no need extra library for file upload. pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.mkyong</groupId> […]
In this article, we will show you how to create a Spring Boot traditional WAR file and deploy to a Tomcat servlet container. In Spring Boot, to create a WAR for deployment, we need 3 steps: Extends SpringBootServletInitializer Marked the embedded servlet container as provided. Update packaging to war Tested with Spring Boot 2.1.2.RELEASE Tomcat […]
Spring Boot @ConfigurationProperties lets developers map or bind the entire external configuration values in .properties or .yml files to Java objects. Table of contents: 1. Access a single value using @Value 2. @ConfigurationProperties 3. Add JSR303 Validation 3.1 Add JSR 303 dependencies 3.2 @ConfigurationProperties and @Validated 4. Testing @ConfigurationProperties 5. Download Source Code 6. References […]
In Eclipse, just include the Spring Boot Dev Tools dependency, then the hot swapping and static file reload will be enabled magically. For Intellij IDE, we need extra steps to enable it. 1. Spring Boot Dev Tools With Spring Boot Dev Tools enabled : Any changes to views or resources can be seen in the […]
If Spring Boot project contains multiple main classes, Spring Boot will fail to start or packag for deployment. Terminal $ mvn package #or $ mvn spring-boot:run Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.4.2.RELEASE:run (default-cli) Execution default-cli of goal org.springframework.boot:spring-boot-maven-plugin:1.4.2.RELEASE:run failed: Unable to find a single main class from the following candidates [com.mkyong.Test, com.mkyong.SpringBootWebApplication] -> [Help 1] Maven […]
By default, Spring Boot use Tomcat as the default embedded server, to change it to Jetty, just exclude Tomcat and include Jetty like this : 1. spring-boot-starter-web pom.xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jetty</artifactId> </dependency> 2. spring-boot-starter-thymeleaf pom.xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </exclusion> </exclusions> </dependency> […]
Default, Spring Boot web application starts embedded web server (Tomcat, Jetty, etc.) in port 8080. And we can configure or change the port using the server.port property. Table of contents 1. application.properties 2. application.yml 3. Command Line 4. Environment Variable 5. WebServerFactoryCustomizer 6. Download Source Code 7. References P.S Tested with Spring Boot 1, 2, […]
In Spring Boot, to change the context path, update server.contextPath properties. The following examples update the context path from / to /mkyong or http://localhost:8080/mkyong Note By default, the context path is “/”. P.S Tested with Spring Boot 1.4.2.RELEASE 1. Properties & Yaml 1.1 Update via a properties file. /src/main/resources/application.properties server.port=8080 server.contextPath=/mkyong 1.2 Update via a […]
In this article, we will show you how to develop a Spring Boot web application, using Thymeleaf view, embedded Tomcat and package it as an executable JAR file. Technologies used : Spring Boot 2.1.2.RELEASE Spring 5.1.4.RELEASE Thymeleaf 3.0.11.RELEASE Tomcat embed 9.0.14 JUnit 4.12 Maven 3 Java 8 1. Project Directory 2. Maven Put spring-boot-starter-web and […]
A Spring Boot web application example, using embedded Tomcat + JSP template, and package as an executable WAR file. Technologies used : Spring Boot 1.4.2.RELEASE Spring 4.3.4.RELEASE Tomcat Embed 8.5.6 Maven 3 Java 8 1. Project Directory Create the following folders manually : 2. Project Dependencies Maven example. Read comments for self-explanatory. pom.xml <?xml version="1.0" […]
