How to solve, Classic error: Unable to update index for central|http://repo1.maven.org/maven2. Sometimes Eclipse failed to index the repository due to errors/configurations. In such scenarios, even if you try to search in the repositories, it will fail due to the non indexed repo.To fix these kind of problems, try the following.
1.) Exit Eclipse IDE
2.) Delete workspace_location/.metadata/.plugins/org.maven.ide.eclipse/nexus
3.) Delete workspace_location/.metadata/.plugins/org.eclipse.m2e.core/nexus
4.) Open Eclipse IDE
5.) Go to Window->Preferences->Maven and enable checkbox named “Download repository index updates on startup”.
6.)Restart Eclipse IDE
7.) Wait for the repository to index completely. It is necessary to have a good internet connection to update.