Can't say anything about security-settings.xml, but the culprit seems to be this one:
2014-10-23 15:27:11,471 [Worker-3] DEBUG o.e.m.c.i.builder.MavenBuilderImpl - Exception in build participant org.sonatype.m2e.webby.internal.build.WebbyBuildParticipant
java.lang.NullPointerException: null
at org.codehaus.plexus.util.AbstractScanner.couldHoldIncluded(AbstractScanner.java:363) ~[plexus-utils-3.0.17.jar:na]
at org.sonatype.m2e.webby.internal.util.PathCollector$DirectoryScannerEx.couldHoldIncluded(PathCollector.java:132) ~[na:na]
at org.sonatype.m2e.webby.internal.util.PathCollector$1.visit(PathCollector.java:80) ~[na:na]
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69) ~[org.eclipse.core.resources_3.9.0.v20140514-1307.jar:na]
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49) ~[org.eclipse.core.resources_3.9.0.v20140514-1307.jar:na]
at org.sonatype.m2e.webby.internal.util.PathCollector.collectFiles(PathCollector.java:72) ~[na:na]
at org.sonatype.m2e.webby.internal.build.MainResourceContributor.contribute(MainResourceContributor.java:71) ~[na:na]
at org.sonatype.m2e.webby.internal.build.WebbyBuildParticipant.build(WebbyBuildParticipant.java:191) ~[na:na]
at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:132) ~[org.eclipse.m2e.core_1.6.0.20140819-1152.jar:na]