STS pom.xml error

[EdwardKing]

I am first to use Spring Tool Suite,Version: 3.1.0.RELEASE, File -> New -> Spring Template project,then it download some bytes from internet. But I find pom.xml file is marked by red sign. The error message is follows:
1.Project build error: 'dependencies.dependency.groupId' for null::jar is missing.
2.Project build error: 'dependencies.dependency.artifactId' for null::jar is missing.
3.null (org.apache.maven.plugins:maven-resources-plugin:2.5:resources:default-resources:process-resources)
4.Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-compiler-plugin:2.3.2:testCompile (execution: default-testCompile, phase: test-compile)
5.null (org.apache.maven.plugins:maven-resources-plugin:2.5:testResources:default-testResources:process-test-resources)
6.CoreException: Could not get the value for parameter compilerId for plugin execution default-compile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of its dependencies could not be resolved: Failure to transfer org.codehaus.plexus:plexus-utils:jar:2.0.5 from http://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.plexus:plexus-utils:jar:2.0.5 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/...tils-2.0.5.jar
7.Project build error: 'dependencies.dependency.version' for null::jar is missing.
8.CoreException: Could not get the value for parameter compilerId for plugin execution default-testCompile: PluginResolutionException: Plugin org.apache.maven.plugins:maven-compiler-plugin:2.3.2 or one of its dependencies could not be resolved: Failure to transfer org.codehaus.plexus:plexus-utils:jar:2.0.5 from http://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.plexus:plexus-utils:jar:2.0.5 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/...tils-2.0.5.jar

Then I use quick fixes avaliable url to Install m2e connectors,I choose m2e-subversive to install. After installed it,pom.xle still error,like follows:
1.Failure to transfer org.codehaus.plexus:plexus-utils:jar:2.0.5 from http://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.plexus:plexus-utils:jar:2.0.5 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/...tils-2.0.5.jar

2.Execution default-resources of goal org.apache.maven.plugins:maven-resources-plugin:2.5:resources failed: Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved: Failure to transfer org.codehaus.plexus:plexus-utils:jar:2.0.5 from http://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.plexus:plexus-utils:jar:2.0.5 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/...tils-2.0.5.jar (org.apache.maven.plugins:maven-resources-plugin:2.5:resources:default-resources:process-resources)

3.Execution default-testResources of goal org.apache.maven.plugins:maven-resources-plugin:2.5:testResources failed: Plugin org.apache.maven.plugins:maven-resources-plugin:2.5 or one of its dependencies could not be resolved: Failure to transfer org.codehaus.plexus:plexus-utils:jar:2.0.5 from http://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.plexus:plexus-utils:jar:2.0.5 from/to central (http://repo.maven.apache.org/maven2): connection timed out to http://repo.maven.apache.org/maven2/...tils-2.0.5.jar (org.apache.maven.plugins:maven-resources-plugin:2.5:testResources:default-testResources:process-test-resources)

How to fix above errors? I search Google,but I still can't find the answer. Do Anyone know how to solve it?

[Martin Lippert]

Hey!

It looks like the Maven Integration for Eclipse is not able to download artifacts from the internet somehow. Are you behind a proxy? If so, you would need to setup the proxy configs for Maven in your settings.xml file of your local Maven directory (~/.m2), as described here:

http://maven.apache.org/guides/mini/guide-proxies.html

So you definitely don't need to install add-ons, in case you downloaded the STS distribution and started using it by creating a new project from one of the templates. With regards to the Maven support, everything is pre-installed.

HTH,
Martin

[Allamande]

Is there another possibility that doesn't involves proxy? I got the same issue and no proxy.

Hey!

It looks like the Maven Integration for Eclipse is not able to download artifacts from the internet somehow. Are you behind a proxy? If so, you would need to setup the proxy configs for Maven in your settings.xml file of your local Maven directory (~/.m2), as described here:

http://maven.apache.org/guides/mini/guide-proxies.html

So you definitely don't need to install add-ons, in case you downloaded the STS distribution and started using it by creating a new project from one of the templates. With regards to the Maven support, everything is pre-installed.

HTH,
Martin

[Martin Lippert]

Hey!

For many of those cases, deleting the local Maven repo helps. It triggers Maven to download a fresh copy of the used artifacts.

HTH,
Martin