Duplicate package warnings in the logs

2014-12-04 11:30:26,237 http-bio-8280-exec-22 INFO [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'com.atlassian.plugin.metadata' - accepting version '3.0.16'. Files: atlassian-plugins-core-3.0.16.jar and metadata
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/atlassian-plugins-core-3.0.16.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/classes/com/atlassian/plugin/metadata'
2014-12-04 11:30:26,237 http-bio-8280-exec-22 INFO [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'com.atlassian.crowd.util' - accepting version '2.8.0'. Files: crowd-api-2.8.0.jar and util
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/crowd-api-2.8.0.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/classes/com/atlassian/crowd/util'
2014-12-04 11:30:26,238 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'com.atlassian.crowd' with different versions. Files: crowd-api-2.8.0.jar and atlassian-extras-3.2.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/crowd-api-2.8.0.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/atlassian-extras-3.2.jar'
2014-12-04 11:30:26,238 http-bio-8280-exec-22 INFO [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'com.atlassian.crowd.user' - accepting version '2.8.0'. Files: crowd-integration-api-2.8.0.jar and user
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/crowd-integration-api-2.8.0.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/classes/com/atlassian/crowd/user'
2014-12-04 11:30:26,238 http-bio-8280-exec-22 INFO [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'com.atlassian.crowd.console.action' - accepting version '2.8.0'. Files: crowd-language-2.8.0.jar and action
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/crowd-language-2.8.0.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/classes/com/atlassian/crowd/console/action'
2014-12-04 11:30:26,439 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.InternalScanner] Unable to find any resources for package 'org/xml'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.activation' with different versions. Files: activation-1.1.1.jar and activation-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/activation-1.1.1.jar'
  '/home/denise/crowd/install/2.8/apache-tomcat/lib/activation-1.1.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.transaction' with different versions. Files: jboss-transaction-api_1.1_spec-1.0.1.Final.jar and jta-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jboss-transaction-api_1.1_spec-1.0.1.Final.jar'
  '/home/denise/crowd/install/2.8/apache-tomcat/lib/jta-1.1.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.transaction.xa' with different versions. Files: jboss-transaction-api_1.1_spec-1.0.1.Final.jar and jta-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jboss-transaction-api_1.1_spec-1.0.1.Final.jar'
  '/home/denise/crowd/install/2.8/apache-tomcat/lib/jta-1.1.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation.concurrent' with different versions. Files: jsr305-1.1.jar and annotations-2.0.3.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/annotations-2.0.3.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation' with different versions. Files: jsr305-1.1.jar and annotations-2.0.3.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/annotations-2.0.3.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation.meta' with different versions. Files: jsr305-1.1.jar and annotations-2.0.3.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/annotations-2.0.3.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation.concurrent' with different versions. Files: jsr305-2.0.3.jar and jsr305-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-2.0.3.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation' with different versions. Files: jsr305-2.0.3.jar and jsr305-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-2.0.3.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'
2014-12-04 11:30:26,446 http-bio-8280-exec-22 WARN [org.twdata.pkgscanner.ExportPackageListBuilder] Package Scanner found duplicates for package 'javax.annotation.meta' with different versions. Files: jsr305-2.0.3.jar and jsr305-1.1.jar
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-2.0.3.jar'
  '/home/denise/crowd/install/2.8/crowd-webapp/WEB-INF/lib/jsr305-1.1.jar'