Also this error appears in Eclipse log (probably when plugin tring to display properties)
java.lang.NoSuchMethodException: com.sun.facelets.tag.jstl.fn.JstlFnLibrary.getNamespace()
at java.lang.Class.getMethod(Class.java:1605)
at org.eclipse.jem.internal.proxy.ide.IDEBeanTypeProxy.getMethodProxy(IDEBeanTypeProxy.java:99)
at org.eclipse.jst.jsf.core.internal.jem.BeanProxyUtil$BeanProxyWrapper.call(BeanProxyUtil.java:120)
at org.eclipse.jst.jsf.core.internal.jem.BeanProxyUtil$BeanProxyWrapper.call(BeanProxyUtil.java:150)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.LibraryClassBasedTagRecord.resolveNS(LibraryClassBasedTagRecord.java:508)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.LibraryClassBasedTagRecord.initURI(LibraryClassBasedTagRecord.java:133)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.TagRecordFactory.createRecords(TagRecordFactory.java:44)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.JarFileFaceletTaglibLocator.findInJars(JarFileFaceletTaglibLocator.java:129)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.JarFileFaceletTaglibLocator.locate(JarFileFaceletTaglibLocator.java:65)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.ProjectTaglibDescriptor$1.run(ProjectTaglibDescriptor.java:103)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.ProjectTaglibDescriptor.initialize(ProjectTaglibDescriptor.java:90)
at org.eclipse.jst.jsf.facelet.core.internal.registry.taglib.ProjectTaglibDescriptor.getTagLibraries(ProjectTaglibDescriptor.java:113)
at org.eclipse.jst.jsf.facelet.core.internal.registry.FaceletTagRegistry.initialize(FaceletTagRegistry.java:151)
at org.eclipse.jst.jsf.facelet.core.internal.registry.FaceletTagRegistry.getAllTagLibraries(FaceletTagRegistry.java:106)
at org.eclipse.jst.jsf.facelet.core.internal.registry.FaceletTagRegistry.getTagLibrary(FaceletTagRegistry.java:210)
at org.eclipse.jst.jsf.facelet.core.internal.cm.FaceletDocumentFactory.getOrCreateCMDocument(FaceletDocumentFactory.java:142)
at org.eclipse.jst.jsf.facelet.core.internal.cm.FaceletDocumentFactory.createCMDocumentForContext(FaceletDocumentFactory.java:55)
at org.eclipse.jst.jsf.facelet.core.internal.cm.FaceletDocumentFactory.createCMElementDeclaration(FaceletDocumentFactory.java:77)
at org.eclipse.jst.jsf.facelet.ui.internal.hover.FaceletHover$MyHTMLTagInfoHoverProcessor.getCMElementDeclaration(FaceletHover.java:132)
at org.eclipse.wst.xml.ui.internal.taginfo.XMLTagInfoHoverProcessor.computeTagAttNameHelp(XMLTagInfoHoverProcessor.java:120)
at org.eclipse.wst.xml.ui.internal.taginfo.XMLTagInfoHoverProcessor.computeRegionHelp(XMLTagInfoHoverProcessor.java:108)
at org.eclipse.wst.xml.ui.internal.taginfo.XMLTagInfoHoverProcessor.computeHoverHelp(XMLTagInfoHoverProcessor.java:86)
at org.eclipse.wst.xml.ui.internal.taginfo.XMLTagInfoHoverProcessor.getHoverInfo(XMLTagInfoHoverProcessor.java:257)
at org.eclipse.jst.jsf.facelet.ui.internal.hover.FaceletHover.getHoverInfo(FaceletHover.java:58)
at org.eclipse.wst.sse.ui.internal.taginfo.BestMatchHover.getHoverInfo(BestMatchHover.java:83)
at org.eclipse.jface.text.TextViewerHoverManager$4.run(TextViewerHoverManager.java:168)
released bete