maven dependancy lookup fails even if I have specified repo - maven

Question

I am trying to run a project. Its not able to find a dependency. So I have added repository inside pom.xml
But its not able to lookup for the same.
from pom.xml
<repositories>
<repository>
<releases>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
<checksumPolicy>fail</checksumPolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<updatePolicy>always</updatePolicy>
<checksumPolicy>fail</checksumPolicy>
</snapshots>
<id>spring</id>
<name>Spring Framework Maven Release Repository</name>
<url>http://oss.sonatype.org/content/groups/public</url>
<layout>default</layout>
</repository>
</repositories>
81749 [WARNING] Unable to create Maven project for
com.gemstone.gemfire:gemfire:pom:8.1.0 from repository.
org.apache.maven.project.ProjectBuildingException: Error resolving
project artifact: Failure to find
com.gemstone.gemfire:gemfire:pom:8.1.0 in
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 for project
com.gemstone.gemfire:gemfire:pom:8.1.0
when i applied -X i see following
103850 [DEBUG] === PROJECT BUILD PLAN ================================================
103850 [DEBUG] Project: xxxxx:xxxxxx:0.0.1-SNAPSHOT
103850 [DEBUG] Dependencies (collect): [compile+runtime]
103850 [DEBUG] Dependencies (resolve): [compile, compile+runtime, runtime, test]
103850 [DEBUG] Repositories (dependencies): [central (https://repo.maven.apache.org/maven2, default, releases)]
103850 [DEBUG] Repositories (plugins) : [central (https://repo.maven.apache.org/maven2, default, releases)]
What am I missing here ? I have parent pom.xml with repository mention
parent is not included in child

Answer 1

Given this pom.xml:
<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>test</groupId>
<artifactId>test</artifactId>
<version>0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.gemstone.gemfire</groupId>
<artifactId>gemfire</artifactId>
<version>8.1.0</version>
</dependency>
</dependencies>
</project>
When I tried to run:
$mvn clean compile
The result was:
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building test 0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: https://repo.maven.apache.org/maven2/com/gemstone/gemfire/gemfire/8.1.0/gemfire-8.1.0.pom
[WARNING] The POM for com.gemstone.gemfire:gemfire:jar:8.1.0 is missing, no dependency information available
Downloading: https://repo.maven.apache.org/maven2/com/gemstone/gemfire/gemfire/8.1.0/gemfire-8.1.0.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.642 s
[INFO] Finished at: 2017-04-02T13:31:34+01:00
[INFO] Final Memory: 11M/131M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project test: Could not resolve dependencies for project test:test:jar:0.1-SNAPSHOT: Could not find artifact com.gemstone.gemfire:gemfire:jar:8.1.0 in central (https://repo.maven.apache.org/maven2) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
So I researched for the dependency and repository in mvnrepository.com and I found the repositories that contains this dependency are Spring Plugins and Spring Libs:
Then I just added the Spring Plugins repository in my pom and it worked!
The final POM is:
<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>test</groupId>
<artifactId>test</artifactId>
<version>0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>com.gemstone.gemfire</groupId>
<artifactId>gemfire</artifactId>
<version>8.1.0</version>
</dependency>
</dependencies>
<repositories>
<repository>
<id>spring</id>
<url>http://repo.spring.io/plugins-release</url>
</repository>
</repositories>
</project>