title: POM file is failing with http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException
body: <p>I am trying to open a java maven project and I get this error in the pom file:</p>
  
  <pre><code>Failure to transfer org.apache.maven.plugins:maven-resources-plugin:pom:2.6 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-
   resources-plugin:pom:2.6 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
  </code></pre>
  
  <p>the pom goes like this:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"&gt;
      &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
  
      &lt;groupId&gt;GID&lt;/groupId&gt;
      &lt;artifactId&gt;AID&lt;/artifactId&gt;
      &lt;version&gt;0.0.1&lt;/version&gt;
      &lt;packaging&gt;jar&lt;/packaging&gt;
      &lt;name&gt;name&lt;/name&gt;
      &lt;description&gt;Demo project for Spring Boot&lt;/description&gt;
      &lt;parent&gt;
          &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
          &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;
          &lt;version&gt;1.4.0.BUILD-SNAPSHOT&lt;/version&gt;
      &lt;/parent&gt;
      &lt;repositories&gt;
          &lt;repository&gt;
              &lt;id&gt;spring-snapshots&lt;/id&gt;
              &lt;name&gt;Spring Snapshots&lt;/name&gt;
              &lt;url&gt;https://repo.spring.io/libs-snapshot&lt;/url&gt;
              &lt;snapshots&gt;
                  &lt;enabled&gt;true&lt;/enabled&gt;
              &lt;/snapshots&gt;
          &lt;/repository&gt;
      &lt;/repositories&gt;
      &lt;properties&gt;
          &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
          &lt;java.version&gt;1.8&lt;/java.version&gt;
      &lt;/properties&gt;
      &lt;dependencies&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-websocket&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.webjars&lt;/groupId&gt;
              &lt;artifactId&gt;webjars-locator&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.webjars&lt;/groupId&gt;
              &lt;artifactId&gt;sockjs-client&lt;/artifactId&gt;
              &lt;version&gt;1.0.2&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.webjars&lt;/groupId&gt;
              &lt;artifactId&gt;stomp-websocket&lt;/artifactId&gt;
              &lt;version&gt;2.3.3&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.webjars&lt;/groupId&gt;
              &lt;artifactId&gt;bootstrap&lt;/artifactId&gt;
              &lt;version&gt;3.3.7&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.webjars&lt;/groupId&gt;
              &lt;artifactId&gt;jquery&lt;/artifactId&gt;
              &lt;version&gt;3.1.0&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;net.java.dev.jna&lt;/groupId&gt;
              &lt;artifactId&gt;jna-platform&lt;/artifactId&gt;
              &lt;version&gt;4.2.2&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-data-jpa&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-jersey&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
              &lt;artifactId&gt;hibernate-core&lt;/artifactId&gt;
              &lt;version&gt;5.1.0.Final&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
              &lt;artifactId&gt;hibernate-entitymanager&lt;/artifactId&gt;
              &lt;version&gt;5.1.0.Final&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;!-- Jasper Report Specific Jars START --&gt;
          &lt;!-- to resolve itext maven issue --&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;com.lowagie&lt;/groupId&gt;
              &lt;artifactId&gt;itext&lt;/artifactId&gt;
              &lt;version&gt;2.1.7&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;net.sf.jasperreports&lt;/groupId&gt;
              &lt;artifactId&gt;jasperreports&lt;/artifactId&gt;
              &lt;version&gt;6.2.1&lt;/version&gt;
              &lt;exclusions&gt;
                  &lt;exclusion&gt;
                      &lt;groupId&gt;com.lowagie&lt;/groupId&gt;
                      &lt;artifactId&gt;itext&lt;/artifactId&gt;
                  &lt;/exclusion&gt;
                  &lt;exclusion&gt;
                      &lt;groupId&gt;org.olap4j&lt;/groupId&gt;
                      &lt;artifactId&gt;olap4j&lt;/artifactId&gt;
                  &lt;/exclusion&gt;
              &lt;/exclusions&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;net.sf.jasperreports&lt;/groupId&gt;
              &lt;artifactId&gt;jasperreports-fonts&lt;/artifactId&gt;
              &lt;version&gt;6.0.0&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;!-- for report in xls format --&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.apache.poi&lt;/groupId&gt;
              &lt;artifactId&gt;poi&lt;/artifactId&gt;
              &lt;version&gt;3.10.1&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;com.microsoft.sqlserver&lt;/groupId&gt;
              &lt;artifactId&gt;sqljdbc4&lt;/artifactId&gt;
              &lt;version&gt;4.0&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;joda-time&lt;/groupId&gt;
              &lt;artifactId&gt;joda-time&lt;/artifactId&gt;
              &lt;version&gt;2.2&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;
              &lt;scope&gt;test&lt;/scope&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;com.googlecode.json-simple&lt;/groupId&gt;
              &lt;artifactId&gt;json-simple&lt;/artifactId&gt;
              &lt;version&gt;1.1&lt;/version&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.liquibase&lt;/groupId&gt;
              &lt;artifactId&gt;liquibase-core&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;org.hibernate&lt;/groupId&gt;
              &lt;artifactId&gt;hibernate-envers&lt;/artifactId&gt;
              &lt;version&gt;${hibernate.version}&lt;/version&gt;
          &lt;/dependency&gt;
      &lt;/dependencies&gt;
      &lt;build&gt;
          &lt;plugins&gt;
              &lt;plugin&gt;
                  &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
                  &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;
                  &lt;version&gt;1.3.3.RELEASE&lt;/version&gt;
              &lt;/plugin&gt;
          &lt;/plugins&gt;
      &lt;/build&gt;
  &lt;/project&gt;
  </code></pre>
  
  <p>I understand that this is probably because another pom file that failed to be downloaded....but I am not able to figure how to resolve this problem</p>