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I'm trying to learn Spring Boot hands-on and importing the boilerplate for basic spring boot application through Spring Starter using my IntelliJ IDE, but Maven is unable to resolve all dependencies and my project is missing out on important dependencies. I can't figure out the reason for this.

First I thought the problem was using JDK8 for newer versions of the SpringFramework, then I installed JDK11 but the same problem persists and as far as I can understand POM.xml has all the dependencies listed in it.

Screenshot of IDE to get an idea

 <?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>2.2.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.selfspring</groupId> <artifactId>conference-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <name>conference-demo</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-starter-test</artifactId> <scope>test</scope> <exclusions> <exclusion> <groupId>org.junit.vintage</groupId> <artifactId>junit-vintage-engine</artifactId> </exclusion> </exclusions> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>``` here is all the dependencies it is unable to resolve: Cannot resolve org.hibernate.validator:hibernate-validator:6.0.18.Final Cannot resolve org.hamcrest:hamcrest:2.1 Cannot resolve org.ow2.asm:asm:5.0.4 Cannot resolve org.springframework:spring-expression:5.2.5.RELEASE Cannot resolve org.junit.platform:junit-platform-engine:1.5.2 Cannot resolve net.minidev:accessors-smart:1.2 Cannot resolve net.bytebuddy:byte-buddy:1.10.8 Cannot resolve jakarta.xml.bind:jakarta.xml.bind-api:2.3.3 Cannot resolve org.springframework:spring-aop:5.2.5.RELEASE Cannot resolve com.fasterxml:classmate:1.5.1 Cannot resolve org.junit.jupiter:junit-jupiter-api:5.5.2 Cannot resolve org.mockito:mockito-junit-jupiter:3.1.0 Cannot resolve org.opentest4j:opentest4j:1.2.0 Cannot resolve org.objenesis:objenesis:2.6 Cannot resolve org.springframework:spring-webmvc:5.2.5.RELEASE Cannot resolve org.springframework.boot:spring-boot-test-autoconfigure:2.2.6.RELEASE Cannot resolve net.bytebuddy:byte-buddy-agent:1.10.8 Cannot resolve org.junit.jupiter:junit-jupiter:5.5.2 Cannot resolve org.springframework.boot:spring-boot-test:2.2.6.RELEASE Cannot resolve jakarta.validation:jakarta.validation-api:2.0.2 Cannot resolve org.jboss.logging:jboss-logging:3.4.1.Final Cannot resolve net.minidev:json-smart:2.3 Cannot resolve org.springframework:spring-test:5.2.5.RELEASE Cannot resolve org.assertj:assertj-core:3.13.2 Cannot resolve jakarta.activation:jakarta.activation-api:1.2.2 Cannot resolve org.skyscreamer:jsonassert:1.5.0 Cannot resolve org.springframework.boot:spring-boot-starter-test:2.2.6.RELEASE Cannot resolve org.mockito:mockito-core:3.1.0 Cannot resolve com.vaadin.external.google:android-json:0.0.20131108.vaadin1 Cannot resolve com.jayway.jsonpath:json-path:2.4.0 Cannot resolve org.junit.jupiter:junit-jupiter-params:5.5.2 Cannot resolve org.xmlunit:xmlunit-core:2.6.4 Cannot resolve org.springframework:spring-jcl:5.2.5.RELEASE Cannot resolve org.apiguardian:apiguardian-api:1.1.0 Cannot resolve org.springframework:spring-beans:5.2.5.RELEASE Cannot resolve org.junit.jupiter:junit-jupiter-engine:5.5.2 Cannot resolve org.junit.platform:junit-platform-commons:1.5.2
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  • do you have a custom maven mirror defined? Commented Apr 8, 2020 at 10:51
  • @AbhinavGupta can you see libraries in External Libraries? You can delete .m2 folder and try again Commented Apr 8, 2020 at 10:51
  • @MarcoBehler no it is the default maven picked by spring started and no custom changes. Commented Apr 8, 2020 at 11:04
  • @Lemmy yes there are quite a few libraries in here but I can't find .m2 folder you're talking about. Commented Apr 8, 2020 at 11:06
  • @AbhinavGupta stackoverflow.com/questions/6081617/missing-maven-m2-folder Commented Apr 8, 2020 at 11:11

1 Answer 1

Reset to default
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Try nuking your .m2 folder, and then pull dependencies again. I usually do it like this: delete everything from .m/repo, I go to intellij and add space in pom.xml and delete it so it offers me to pull changes that were made in pom.xml

EDIT: If that does not help, you can always run

mvn clean - clear dependencies so you get something like a clean slate mvn install - initiates the pulling of dependencies again
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1 Comment

I was unaware of this hack and someone mentioned this in the comments.

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