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When there are multiple External Tool builders defined for a project, the Java Builder cannot be moved up and down in the list because the buttons are greyed out. The 'Remove' and 'Edit' buttons are also greyed. 'Remove' should be available for projects that do all their compilation using an Ant script.
The only thing you can edit in this property page is the external tool builders. Other builders provided by plug-ins cannot be moved nor deleted thru this page. Actually, the order for these builders is dependent on the nature prerequisite chain. The "capability" feature which did not make it into release 2.0, will address some of these issues.