Cannot complete the install because of a conflicting dependency.
  Software being installed: Groovy-Eclipse M2E integration 2.9.2.xx-201604081629-e45 (org.codehaus.groovy.m2eclipse.feature.feature.group 2.9.2.xx-201604081629-e45)
  Software currently installed: Red Hat Developer Studio (Branded Product) 10.0.0.Alpha1-v20160520-0424-B5396 (com.jboss.devstudio.core.package 10.0.0.Alpha1-v20160520-0424-B5396)
  Software currently installed: TestNG 6.9.11.201604020423 (org.testng.eclipse.feature.group 6.9.11.201604020423)
  Only one of the following can be installed at once: 
    Java Development Tools Core 3.12.0.v20160426-1326 (org.eclipse.jdt.core 3.12.0.v20160426-1326)
    Java Development Tools Core 3.11.0.xx-201604081629-e45 (org.eclipse.jdt.core 3.11.0.xx-201604081629-e45)
  Cannot satisfy dependency:
    From: Red Hat Developer Studio (Core Features) 10.0.0.Alpha1-v20160520-0424-B5396 (com.jboss.devstudio.core.feature.feature.group 10.0.0.Alpha1-v20160520-0424-B5396)
    To: org.eclipse.jdt.feature.group 0.0.0
  Cannot satisfy dependency:
    From: Red Hat Developer Studio (Branded Product) 10.0.0.Alpha1-v20160520-0424-B5396 (com.jboss.devstudio.core.package 10.0.0.Alpha1-v20160520-0424-B5396)
    To: com.jboss.devstudio.core.feature.feature.group [10.0.0.Alpha1-v20160520-0424-B5396]
  Cannot satisfy dependency:
    From: Groovy-Eclipse Compilerless Feature 2.9.2.xx-201604081629-e45 (org.codehaus.groovy.compilerless.feature.feature.group 2.9.2.xx-201604081629-e45)
    To: org.codehaus.groovy.headless.feature.feature.group [2.9.2.xx-201604081629-e45]
  Cannot satisfy dependency:
    From: Groovy-Eclipse Feature 2.9.2.xx-201604081629-e45 (org.codehaus.groovy.eclipse.feature.feature.group 2.9.2.xx-201604081629-e45)
    To: org.codehaus.groovy.compilerless.feature.feature.group [2.9.2.xx-201604081629-e45]
  Cannot satisfy dependency:
    From: Groovy-Eclipse Headless Feature 2.9.2.xx-201604081629-e45 (org.codehaus.groovy.headless.feature.feature.group 2.9.2.xx-201604081629-e45)
    To: org.codehaus.groovy.jdt.patch.feature.group [2.9.2.xx-201604081629-e45]
  Cannot satisfy dependency:
    From: Groovy-Eclipse M2E integration 2.9.2.xx-201604081629-e45 (org.codehaus.groovy.m2eclipse.feature.feature.group 2.9.2.xx-201604081629-e45)
    To: org.codehaus.groovy.eclipse.feature.feature.group 0.0.0
  Cannot satisfy dependency:
    From: Java Development Tools JUnit support 3.9.0.v20160421-1701 (org.eclipse.jdt.junit 3.9.0.v20160421-1701)
    To: bundle org.eclipse.jdt.core [3.12.0,4.0.0)
  Cannot satisfy dependency:
    From: TestNG Eclipse Support 6.9.11.201604020423 (org.testng.eclipse 6.9.11.201604020423)
    To: bundle org.eclipse.jdt.junit 0.0.0
  Cannot satisfy dependency:
    From: TestNG 6.9.11.201604020423 (org.testng.eclipse.feature.group 6.9.11.201604020423)
    To: org.testng.eclipse [6.9.11.201604020423]
  Cannot satisfy dependency:
    From Patch: org.codehaus.groovy.jdt.patch.feature.group 2.9.2.xx-201604081629-e45 Eclipse Java Development Tools 3.12.0.v20160428-0800 (org.eclipse.jdt.feature.group 3.12.0.v20160428-0800)
    To: org.eclipse.jdt.core [3.11.0.xx-201604081629-e45]