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Paul Field commented on TAP5-541: --------------------------------- We had the same issue with the "Parameter namespacePrefix was null" error after upgrading to T5.1.0.2. It turned out that we had an old version of the woodstox library in the classpath. They appear to have changed the Maven group/artifact ids so Tapestry's dependency on a newer version didn't replace the older version. The *OLD* library has a group id of "org.codehaus.woodstox" and an artifact id of "wstx-asl". If you find you have a library that pulls in this other library, you can exclude the dependency like this: <dependency> <groupId>com.db.eqr.rsm</groupId> <artifactId>rsm-client</artifactId> <version>1.0</version> <exclusions> <exclusion> <groupId>org.codehaus.woodstox</groupId> <artifactId>wstx-asl</artifactId> </exclusion> </exclusions> </dependency> > Regression: Parameter namespacePrefix was null > ---------------------------------------------- > > Key: TAP5-541 > URL: https://issues.apache.org/jira/browse/TAP5-541 > Project: Tapestry 5 > Issue Type: Bug > Components: tapestry-core > Affects Versions: 5.1 > Environment: Windows XP 5.1,x86, Java HotSpot(TM) Client VM > 1.5.0_15-b04,Sun Microsystems Inc., JBoss 4.2.3 > Reporter: Andrej Aschenbrenner > Assignee: Howard M. Lewis Ship > > I get an exception after switching to the new Tapestry 5.1.0.0 Version. > Relevant Template snippet: > <html xmlns="http://www.w3.org/1999/xhtml" > xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd"> > <head> > <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> > <title>${title}</title> > <meta name="version" content="${version}" /> > <link rel="stylesheet" type="text/css" > href="${asset:context:css/global.css}"/> > <link rel="stylesheet" type="text/css" title="Standard" > href="${asset:context:css/standard/style.css}"/> > </head> > ... > Exception StackTrace snippet: > 16:18:38,581 ERROR [Login] Render queue error in > CompositeRenderCommand[Start[http://www.w3.org/1999/xhtml html], > DefineNamespace[null http://www.w3.org/1999/xhtml], Text[ > ], Start[http://www.w3.org/1999/xhtml head], Text[ > ], Start[http://www.w3.org/1999/xhtml meta], AttributeNS[ http-equiv > "Content-Type"], AttributeNS[ content "text/html; charset=UTF-8"], End, Text[ > ], Start[http://www.w3.org/1999/xhtml title]]: Parameter namespacePrefix > was null. > java.lang.IllegalArgumentException: Parameter namespacePrefix was null. > at > org.apache.tapestry5.ioc.internal.util.Defense.notNull(Defense.java:37) > at org.apache.tapestry5.dom.Element.defineNamespace(Element.java:519) > at > org.apache.tapestry5.internal.services.MarkupWriterImpl.defineNamespace(MarkupWriterImpl.java:221) > at > org.apache.tapestry5.internal.pageload.PageLoaderImpl$4.render(PageLoaderImpl.java:341) > at > org.apache.tapestry5.internal.pageload.CompositeRenderCommand.render(CompositeRenderCommand.java:68) > at > org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:74) > at > org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:121) > at > $PageRenderQueue_11fb85075e4.render($PageRenderQueue_11fb85075e4.java) > at > $PageRenderQueue_11fb85075db.render($PageRenderQueue_11fb85075db.java) > at > org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37) > ... > For me it seems that Tapestry requires a namespace declaration on the <title> > tag. But I have already the default namespace declaration on > the <html xmlns="http://www.w3.org/1999/xhtml"> tag. > P.S. with only <html > xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd"> it fails > also. But it did work on Tapestry 5.0.18 > Thanks, > Andrej Aschenbrenner -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.