Maven Build- [ERROR] 'dependencies.dependency.version' for org.springframework.cloud:spring-cloud-starter-zuul:jar is missing. # line 28, column 15 - spring-boot

Question

POM.XML
<?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>
<groupId>com.ge.aviation.clearview</groupId>
<artifactId>clearview-api-gateway</artifactId>
<version>1.0.24</version>
<packaging>jar</packaging>
<name>clearview-api-gateway</name>
<description>API Gateway</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.6.1</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>2.6.1</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-joda</artifactId>
</dependency>
<dependency>
<groupId>com.googlecode.json-simple</groupId>
<artifactId>json-simple</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>joda-time</groupId>
<artifactId>joda-time</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.security.oauth</groupId>
<artifactId>spring-security-oauth2</artifactId>
<version>2.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>com.vaadin.external.google</groupId>
<artifactId>android-json</artifactId>
<version>0.0.20131108.vaadin1</version>
<scope>compile</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.BUILD-SNAPSHOT</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>clearviewcmr-gateway-service</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
</project>
-> Zuul jar is missing as per error though dalston version is defined
[ERROR]
Downloading from spring-snapshots: https://repo.spring.io/snapshot/org/springframework/cloud/spring-cloud-dependencies/Dalston.BUILD-SNAPSHOT/spring-cloud-dependencies-Dalston.BUILD-SNAPSHOT.pom
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: Could not transfer artifact org.springframework.cloud:spring-cloud-dependencies:pom:Dalston.BUILD-SNAPSHOT from/to spring-snapshots (https://repo.spring.io/snapshot): Transfer failed for https://repo.spring.io/snapshot/org/springframework/cloud/spring-cloud-dependencies/Dalston.BUILD-SNAPSHOT/spring-cloud-dependencies-Dalston.BUILD-SNAPSHOT.pom ProxyInfo{host='cinext11.proxy.corporate.ge.com', userName='null', port=80, type='https', nonProxyHosts='null'} # line 111, column 16
[ERROR] 'dependencies.dependency.version' for org.springframework.cloud:spring-cloud-starter-zuul:jar is missing. # line 28, column 15

Answer 1

The Dalston release train for Spring-Cloud was released in 2016.
You shouldn't use its SNAPSHOT versions anymore.
There is a Dalston.SR5 release from December 2017, which should result in:
spring-cloud-dependencies:Dalston.SR5
-> spring-cloud-netflix-dependencies:1.3.6.RELEASE
-> spring-cloud-starter-zuul:1.3.6.RELEASE
-> zuul-core:1.3.0
If you're starting with a new project and you have spring boot 2.2.x, you can also use the latest release train (Hoxton). Spring Cloud never upgraded to Netflix Zuul 2, however, but released an alternative: Spring-Cloud-Gateway. See How is Spring Cloud Gateway different from Zuul?
Bottom line: avoid depending on spring-snapshots or spring-milestones repositories unless you need bleeding edge releases.