Spring Boot application can't resolve the org.springframework.boot package

Question

I have set up a spring boot project using the Spring Initializer, I tried several times to create a new project or play with the dependencies, everything seems to be in place.

I am using STS(Spring Tool Suite) and it shows errors about the imports from theorg.springframework.boot package. Running the application throws an exception:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: SpringApplication cannot be resolved.

com.example.DemoApplication:

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;  @SpringBootApplication public class DemoApplication {      public static void main(String[] args) {         SpringApplication.run(DemoApplication.class, args);     } } 

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>      <groupId>com.example</groupId>     <artifactId>demo</artifactId>     <version>0.0.1-SNAPSHOT</version>     <packaging>jar</packaging>      <name>demo</name>     <description>Demo project for Spring Boot</description>      <parent>         <groupId>org.springframework.boot</groupId>         <artifactId>spring-boot-starter-parent</artifactId>         <version>1.2.7.RELEASE</version>         <relativePath/> <!-- lookup parent from repository -->     </parent>      <properties>         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>         <java.version>1.8</java.version>         <start-class>com.example.DemoApplication</start-class>     </properties>      <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>          <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>     </dependencies>      <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </build>   </project> 

I am using Java 1.8 with STS.

Answer 1

change the version of spring boot parent

<parent>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-parent</artifactId>     <version>1.4.2.RELEASE</version>  </parent> 

Answer 2

Right button on project -> Maven -> Update Project

then check "Force update of Snapshots/Releases"