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Hector Ccasani
Asked: 2020-09-03 13:09:29 +0800 CST 2020-09-03 13:09:29 +0800 CST

Spring Boot + Maven: Project build error: Non-resolvable parent POM

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I am creating a Spring Boot project using the Spring Starter Project. I initially did it normally a couple of times a few days ago. Today I try again and encounter this error.

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The description of the error is this:

Project build error: Non-resolvable parent POM for com.example:demo:0.0.1-SNAPSHOT: Failure to transfer org.springframework.boot:spring-boot-starter-parent:pom:1.5.15.RELEASE from https:/ /repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.springframework.boot:spring-boot-starter-parent:pom:1.5.15.RELEASE from/to central ( https://repo.maven.apache.org/maven2 ): connect timed out and 'parent.relativePath' points at non-local POM

There are similar questions that suggest I do this:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.15.RELEASE</version>
    <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
</parent>

But nothing happens. And in general I do not understand the error (to which it refers). Please I need you to shed some light on me. Thanks in advance.

java

2 Answers

  1. I just solved the problem thanks to the comment above: Yes, I deduce that the problem is because the MAVEN server has a bug... since when creating the project THE PON FILE is created with version 2.2.2 (IN MY CASE ):

    Version that exists since it is not downloaded

    By heading to the following path from our team:

    C:\Users\USUARIO\.m2\repository\org\springframework\boot\spring-boot-starter

    We will find the available versions...in my case I found (2.1.8 - 2.2.0 - 2.2.1) as we can see there is no version 2.2.2 that appears in the PON file of my project

    The solution

    • In the PON file I changed to version 2.2.1 (2.2.1.RELEASE)

    Since it is the most recent available on my PC

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  2. Best Answer

    What the message tells you is that Maven went to download a dependency (in this case the parentand couldn't find it).

    It could be due to any punctual thing (connection failure, server down, etc.); The thing is that by default, Maven doesn't try to download the dependencies again until some time has passed, so you get the same thing.

    Options:

    • Run maven with the option -Uto force update dependencies.

    • Find the local maven repository (in $HOME/.m2/repository), find the folder org/springframework/boot/spring-boot-starter-parentand delete it, so it doesn't find the dependency in local and try to load it again. More work, but it won't try to update EVERY dependency you have.

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