POM error: Failure to find org.springframework.boot

There might have been some intermittent Internet issue or something. I was facing the same problem yesterday. Updating the the project (On STS or Eclipse, right click on the project and Maven -> Update project -> tick everything except Offline) after sometime fixed it.

Check Settings.xml file mapping in Eclipse Window->Project->Maven->User Settings, It should be default xml provided from Maven config folder. You might have configured your own xml file which suites for you project needs.

I got a similar exception while maven-build process.

If you are using a proxy network - update settings.xml in your maven folder

../apache-maven-3.2.3\conf/settings.xml

settings.xml content

<proxies>
    <proxy>
      <id>...</id>
      <active>true</active>
      <protocol>http</protocol>
      <username>....</username>
      <password>....</password>
      <host>....</host>
      <port>....</port>
      <nonProxyHosts>local.net|some.host.com</nonProxyHosts>
    </proxy>
   </proxies>

project(right click) -> Maven -> Update project -> tick everything (except OfflinI)

I got the issue resolved.