不能在Eclipse上使用Maven

Question

I installed a new Eclipse EE 4.9 and downloaded the newest Maven. In Windwows->Preferences->Maven :

->Installations : I chose the freshly downloaded Maven

->User Settings : I chose [PATH-TO-MAVEN]\\conf\\settings.xml

When I try to create a simple Maven project, I get that error:

Could not calculate build plan: Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6 Plugin org.apache.maven.plugins:maven-resources-plugin:2.6 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-resources-plugin:jar:2.6

Also, when I open the pom.xml of that project, it says on the line with <packaging> :

<project [...]>
[...]
  <packaging>war</packaging> // <-- here seems to be an error
</project>

that there seems to be an error:

Multiple annotations found at this line:

• CoreException: Could not calculate build plan: Plugin org.apache.maven.plugins:maven-compiler-plugin:3.1 or one of its dependencies could not be resolved: Failed to read artifact
  descriptor for org.apache.maven.plugins:maven-compiler-plugin:jar:3.1: ArtifactResolutionException: Failure to transfer org.apache.maven.plugins:maven-compiler-plugin:pom:3.1 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.apache.maven.plugins:maven-compiler-plugin:pom:3.1 from/to central ( https://repo.maven.apache.org/maven2 ): sun.security.validator.ValidatorException: PKIX path building
  failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

• Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile (execution: default-testCompile, phase: test-compile)

Does anybody have an idea?

Answer 1

Looks like there is an issue going over https to the repo.

ie sun.security.validator.ValidatorException: PKIX path building

Check the version of Java you are using an ensure that you are not passing an incorrect path to the trust store..

ie

-Djavax.net.ssl.trustStore

Have a look at https://confluence.atlassian.com/kb/unable-to-connect-to-ssl-services-due-to-pkix-path-building-failed-779355358.html as there are other resolutions at the bottom of the article..

Just also noted that an issue similar to this has been discussed and anserwed in great detail @ Problems using Maven and SSL behind proxy ..