gwt-richtext org.eclipse.wst.common.project.facet.core.builder 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 org.eclipse.wst.common.project.facet.core.nature