Cannot complete the install because of a conflicting dependency.
  Software being installed: Groovy-Eclipse Feature 2.0.1.20100319-1100-e35-RELEASE (org.codehaus.groovy.eclipse.feature.feature.group 2.0.1.20100319-1100-e35-RELEASE)
  Software currently installed: Eclipse Platform 3.5.2 (Eclipse Platform 3.5.2)
  Only one of the following can be installed at once: 
    Java Development Tools Core 3.5.2.20100319-1100-e35-RELEASE (org.eclipse.jdt.core 3.5.2.20100319-1100-e35-RELEASE)
    Java Development Tools Core 3.5.2.v_981_R35x (org.eclipse.jdt.core 3.5.2.v_981_R35x)
    Java Development Tools Core 3.5.1.v_972_R35x (org.eclipse.jdt.core 3.5.1.v_972_R35x)
    Java Development Tools Core 3.5.2.20100504-1200-e35 (org.eclipse.jdt.core 3.5.2.20100504-1200-e35)
  Cannot satisfy dependency:
    From: Eclipse Platform 3.5.2 (Eclipse Platform 3.5.2)
    To: org.eclipse.jdt.core [3.5.2.v_981_R35x]
  Cannot satisfy dependency:
    From: Eclipse Platform 3.5.2 (Eclipse Platform 3.5.2)
    To: org.eclipse.jdt.feature.group [3.5.2.r352_v20100108-7r88FEwFH4SRsd9dz0fZ6z-rwffZ]
  Cannot satisfy dependency:
    From: Groovy-Eclipse Feature 2.0.1.20100319-1100-e35-RELEASE (org.codehaus.groovy.eclipse.feature.feature.group 2.0.1.20100319-1100-e35-RELEASE)
    To: org.codehaus.groovy.jdt.patch.feature.group [2.0.1.20100319-1100-e35-RELEASE]
  Cannot satisfy dependency:
    From Patch: org.codehaus.groovy.jdt.patch.feature.group 2.0.1.20100319-1100-e35-RELEASE Eclipse Java Development Tools 3.5.2.r352_v20100108-7r88FEwFH4SRsd9dz0fZ6z-rwffZ (org.eclipse.jdt.feature.group 3.5.2.r352_v20100108-7r88FEwFH4SRsd9dz0fZ6z-rwffZ)
    To: org.eclipse.jdt.core [3.5.2.20100319-1100-e35-RELEASE]