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I've tried to install the ireport plugin on NetBeans 6.1 M1 (200801280931). The result is that jrxml file are no longer recognized as reports, but they are recognized as normal xml files. Playing a bit with NetBeans I discovered that in the advanced options the object type "XML Object" comes before "JRXML Files". Changing the order of the object types fixed the problem but there is something in NetBeans 6.1 M1 that is wrong since even after changing the order, when NetBeans starts again, it is not deterministic that the Jrxml will be recognized. Please note that the module specifies the order requirements in the layer.xml in terms of mime resolver (and this is reflected in the options under the File Types branch) and in the module manifest: Name: com/jaspersoft/ireport/JrxmlDataLoader.class Install-Before: org.openide.loaders.XMLDataObject, org.netbeans.modules.xml.core.XMLDataObject OpenIDE-Module-Class: Loader As POC of this bug I created a simple module to support a new XML file extension called jrxml2. After installing the nbm, if you create in a project a file with extension .jrxml2 the IDE should show you this file with an icon similar to a rectangle. Depending on the order of the file types at startup you can randomly see the rectangle (plugin ok) or the XML file icon (meaning the correct mime resolver has been ignored in favor of the base xml resolver). To see the bug you have to run the ide several times. Some times you'll see the rectangle icone, some others the xml file icon. Giulio
Created attachment 57405 [details] Simple module to demonstrate the problem
The XML modules were refactored a bit in 6.1. As you can see in the Representation Class property for XML Objects, the class name changed. You can make your module work in either 6.0 or 6.1: Install-Before: org.openide.loaders.XMLDataObject, org.netbeans.modules.xml.core.XMLDataObject, org.netbeans.modules.xml.XMLDataObject In fact I will do such an upgrade for netbeans.org modules.
Fixing for nb.org modules in main #e64e822b2033, contrib #88ebb4d585c8. Looks like some fixes were made previously, e.g. #e034d6777aea in main.
BTW, the "New File Type" wizard needs to be fixed as well for NB 6.1, please refer to my comment to issue 131040.