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-Go to Settings tab -Push New button -Fill in some existing url to URL field (e.g. http://www.seznam.cz) and push OK -Go to New Plugins tab -Push Refresh list button You got following exception: org.xml.sax.SAXParseException: Premature end of file. at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292) at org.openide.xml.XMLUtil.parse(XMLUtil.java:319) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getDocument(AutoupdateCatalogParser.java:107) at org.netbeans.modules.autoupdate.updateprovider.AutoupdateCatalogParser.getUpdateItems(AutoupdateCatalogParser.java:68) ...
The exception is logged only into log. But, the URL should be validated.