java - VSCode maven proj package org.springframework.boot.SpringApplication does not exist

Question

I am trying to start a simple Hello World Project on my Mac.

Using VScode, I downloaded Maven and Java extensions. After opening a maven project, when running the application.java, I get message:

{
"resource": "Projects/***/backend/src/main/java/com/***/backend/BackendApplication.java",
"owner": "_generated_diagnostic_collection_name_#1",
"code": "compiler.err.doesnt.exist",
"severity": 8,
"message": "package org.springframework.boot does not exist",
"startLineNumber": 3,
"startColumn": 8,
"endLineNumber": 3,
"endColumn": 50
}

Here is my application.java:

package com.iz.backend;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class BackendApplication {

    public static void main(String[] args) {
        SpringApplication.run(BackendApplication.class, args);
    }

}

And here is my pom file:

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.1</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.iz</groupId>
<artifactId>backend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>backend</name>
<description>Demo project for Spring Boot</description>

<properties>
    <java.version>11</java.version>
</properties>

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

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

I found on the internet that dependency

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

might solve it. However, it already exists in my pom file.

What am I missing here?

Answer 1

You can try the following two ways:

1. In VS Code, open Command Palette and Search Maven: add a dependency to re-download these packages and rebuild the project;

2. Download these jar packages from Maven Repository locally and add them to referenced libraries manually.

[EDIT]

Add the following dependency in pom.xml:

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

Then rebuild the project.