WorkspaceTree
org.eclipse.jdt.core.javabuilder
com.google.gdt.eclipse.core.webAppProjectValidator
com.google.gwt.eclipse.core.gwtProjectValidator
org.eclipse.m2e.core.maven2Builder
org.eclipse.m2e.core.maven2Nature
org.eclipse.jdt.core.javanature
com.google.gwt.eclipse.core.gwtNature