Spring MVC issues in STS 3.7.3 - spring

Question

I am getting this error on importing https://github.com/spring-projects/spring-mvc-showcase in STS 3.7.3:---
Description Resource Path Location Type
Failure to transfer org.codehaus.mojo:aspectj-maven-plugin:pom:1.2 from 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. Original error: Could not transfer artifact org.codehaus.mojo:aspectj-maven-plugin:pom:1.2 from/to central: connect timed out pom.xml /spring-mvc-showcase line 1 Maven pom Loading Problem
Edit
Mvn is ok now but pom.xml error still persists if I remove the errors and do maven clean I get errors as:
[INFO] https://repo.maven.apache.org/maven2/org/codehaus/mojo/aspectj-maven-plugin/1.2/aspectj-maven-plugin-1.2.pom [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [ERROR] Plugin org.codehaus.mojo:aspectj-maven-plugin:1.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.codehaus.mojo:aspectj-maven-plugin:jar:1.2: Could not transfer artifact org.codehaus.mojo:aspectj-maven-plugin:pom:1.2 from/to central: connect timed out -> [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/PluginResolutionException

Answer 1

First of all STS is build on Eclipse. So you can easily install the IDE Integration Eclipse IDE - M2Eclipse for STS. You can see how here. If you want to use it with this integration plugin you dont need to have a local maven repository.
Resolving Maven dependencies from the Eclipse workspace without installing to local Maven repository
But its also possible to use maven as a local system repository. Download is here and follow the steps for the installation and configuration here.
To see if you have a valid maven installation done, you can test it by typing mvn -v in a cmd shell or using STS -> right click on your project -> run as -> maven build or maven install.
Update:
I would say delete the project from your workspace and try it again. Download the project from gitHub as a zip file and import it again to your workspace. Right Click -> import -> existing maven project.
If you need to use a proxy for your connection you have to create a settings.xml in your .m2 folder. Look here for more info