gwt-extras
org.eclipse.jdt.core.javabuilder
org.maven.ide.eclipse.maven2Builder
com.google.gdt.eclipse.core.webAppProjectValidator
com.google.gwt.eclipse.core.gwtProjectValidator
org.eclipse.jdt.core.javanature
org.maven.ide.eclipse.maven2Nature
com.google.gwt.eclipse.core.gwtNature