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The proposal is to have an attribute called "removable" in module layer.xml for plugin writer to specify whether the predefined instances is removable by users through instance node remove action.
AFAIK instances are can be removable unless you write some code that will behave differently for bundled/not bundled instances. They are stored in system filesystem and module layer is only part of this FS. What is the problem?
That right. The problem is it is a general feeling that Tomcat bundled instance should not be removeable. So we need this attribute to prevent user from accidentally remove it. Anyway, this probably not needed anymore as plugin will have the more control for its UI in the registry node from George coming design.
Pavel, with the remove instance confirmation dialog do we need to have this attribute for Tomcat not to show the remove action on instance node?
Closed as WONTFIX because now we have confirmation dialog and also if user really want to remove, it should be ovious, not hidden.