Non-resolvable parent POM in SpringBoot

Question

I am trying to setup a Maven project for a Spring Boot application but while trying to save the pom.xml file I am getting this following issue:

---

Project build error: Non-resolvable parent POM for
io.javabrains.springbootquickstart:course-api:0.0.1-SNAPSHOT: Could not find artifact
org.springframework.boot:spring-boot-starter-parent:pom:${revision} in central (https:// repo.maven.apache.org/maven2) and 'parent.relativePath' points at wrong local POM

Here is my pom.xml file:

<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>io.javabrains.springbootquickstart</groupId>
  <artifactId>course-api</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <name>Java Api course</name>


 <parent>
    <!-- Your own application should inherit from spring-boot-starter-parent -->
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2 RELEASE</version>
  </parent>



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

Solution 1

Solved the issue. There was a little mistake. It should be 1.4.2.RELEASE instead of 1.4.2 RELEASE. There should not be space between RELEASE and 2. This little dot was causing the issue.

Solution 2

This may be because of spring initializer created project pom file like this

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent> 

However, sts is compatible with version "2.0.4.RELEASE", just make this change

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent> 

further Maven -> Update Project

Solution 3

From where revision will be replaced ?

Modify pom.xml by specifying any version like below.

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
</parent>

Solution 4

Here :

<parent>
  <!-- Your own application should inherit from spring-boot-starter-parent -->
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>${revision}</version>
</parent>

${revision} will be interpolated by Maven (that is translated) only if Maven finds a variable with the revision name.
But revision is not a Maven built in variables. While variables as ${project.version} and ${project.artifactId} are.

So in your case, you have to declare or pass the variable explicitly if you want to use it.

For example it could work by adding it :

<properties>
  <revision>1.4.2 RELEASE</revision>
</properties>

Or by running maven such as : mvn package -Drevision="1.4.2 RELEASE"

You can find more information here.

Note that a revision property appears to have a too broad meaning and doesn't help to understand the property meaning.
A more precise name such as ${spring-boot-version} would make more sense.

Solution 5

Replace

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

with

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
   <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
</parent>

View more solutions

Comments

[Arnaud]

Where should ${revision} come from ?

[T A]

imo repo.maven.apache.org/maven2/org/springframework/boot/… is a valid url, could you again check and post your error message for the 1.4.2 RELEASE?

[Jan Černý]

Please add explanation