Could not connect to https://repo.maven.apache.org/maven2? - maven

Question

I have created a new Springboot application. I am getting an error in POM.xml which is,
Project build error: Non-resolvable parent POM for
org.springframework.boot:spring-boot-sample-activemq:[unknown-version]: Could not transfer artifact org.springframework.boot:spring-boot-samples:pom:${revision} from/to central (https://repo.maven.apache.org/maven2): PROXY and 'parent.relativePath' points at wrong local POM
I have tried updating and cleaning the project. But did not work.
Tried deleting the contents in m2/repositry folder but did not work.
My Settings.xml looks like this,
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
http://maven.apache.org/xsd/settings-1.0.0.xsd">
<proxies>
<proxy>
<active>true</active>
<protocol>http</protocol>
<host>PROXY</host>
<port>3120</port>
<nonProxyHosts>maven</nonProxyHosts>
</proxy>
</proxies>
</settings>
and also i am trying to connect the url through telnet in cmd. but it say
Connecting To repo.maven.apache.org...Could not open connection to the host, on port 3120: Connect failed
My POM.xml Looks like this,
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<!-- Your own application should inherit from spring-boot-starter-parent -->
<artifactId>spring-boot-samples</artifactId>
<groupId>org.springframework.boot</groupId>
<version>${revision}</version>
</parent>
<artifactId>spring-boot-sample-activemq</artifactId>
<name>Spring Boot ActiveMQ Sample</name>
<description>Spring Boot ActiveMQ Sample</description>
<properties>
<main.basedir>${basedir}/../..</main.basedir>
</properties>
<dependencies>
<!-- Compile -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-activemq</artifactId>
</dependency>
<!-- Test -->
<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 working in office environment ..could it be because of firewall issue.. please help ??

Answer 1

There is maybe a proxy issue, but first, you're getting Could not transfer artifact org.springframework.boot:spring-boot-samples:pom:${revision} just because there is no artifact org.springframework.boot:spring-boot-samples in Maven Central : https://search.maven.org/search?q=g:org.springframework.boot%20AND%20a:spring-boot-samples. You are also referring to a property (${revision}) not defined in your POM.
I think you have just copied the example from GitHub where spring-boot-samples is actually defined, but this is an internal module.
You should first read Spring Boot docs about bootstraping projects. Have you noticed the comment in <parent> section of the POM?
<!-- Your own application should inherit from spring-boot-starter-parent -->
For issues related to the proxy, I suggest you to read more about configuring proxies. You also probably need authentication.