After installation of the sampleShop the product dialog throws a NullPointerException in a "MultiLanguageDialogEdit" control. This happens (most likely), because no languages were defined. Instead of defining languages in the custom way the control expects it, it would be better to use the standard i18n dialog mechanism!

Stack trace btw:

2011-08-06 09:10:55,972 ERROR se.[Catalina].[localhost].[/magnolia444].[default]: Servlet.service() for servlet default threw exception
java.lang.RuntimeException: java.lang.NullPointerException
at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:159)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:75)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.module.cache.filter.GZipFilter.doFilter(GZipFilter.java:73)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:64)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:88)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:82)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:86)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:60)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:102)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:120)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:105)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:216)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.NullPointerException
at info.magnolia.module.shop.dialog.MultiLanguageDialogEdit.initLanguages(MultiLanguageDialogEdit.java:155)
at info.magnolia.module.shop.dialog.MultiLanguageDialogEdit.init(MultiLanguageDialogEdit.java:96)
at info.magnolia.cms.gui.dialog.DialogFactory.getDialogControlInstanceByName(DialogFactory.java:188)
at info.magnolia.cms.gui.dialog.DialogFactory.loadDialog(DialogFactory.java:94)
at info.magnolia.cms.gui.dialog.DialogControlImpl.initializeConfig(DialogControlImpl.java:535)
at info.magnolia.cms.gui.dialog.DialogControlImpl.init(DialogControlImpl.java:157)
at info.magnolia.cms.gui.dialog.DialogFactory.getDialogControlInstanceByName(DialogFactory.java:188)
at info.magnolia.cms.gui.dialog.DialogFactory.loadDialog(DialogFactory.java:94)
at info.magnolia.cms.gui.dialog.DialogControlImpl.initializeConfig(DialogControlImpl.java:535)
at info.magnolia.cms.gui.dialog.DialogControlImpl.init(DialogControlImpl.java:157)
at info.magnolia.cms.gui.dialog.DialogFactory.getDialogInstance(DialogFactory.java:100)
at info.magnolia.module.admininterface.DialogMVCHandler.createDialog(DialogMVCHandler.java:212)
at info.magnolia.module.data.dialogs.DataDialog.createDialog(DataDialog.java:80)
at info.magnolia.module.data.dialogs.TypeSelectDataDialog.createDialog(TypeSelectDataDialog.java:141)
at info.magnolia.module.admininterface.DialogMVCHandler.getDialog(DialogMVCHandler.java:457)
at info.magnolia.module.admininterface.DialogMVCHandler.renderHtml(DialogMVCHandler.java:417)
at info.magnolia.cms.servlets.MVCServlet.doPost(MVCServlet.java:124)
at info.magnolia.cms.servlets.MVCServlet.doGet(MVCServlet.java:69)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at info.magnolia.cms.filters.ServletDispatchingFilter.doFilter(ServletDispatchingFilter.java:119)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:84)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:66)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:69)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:88)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:57)
at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:147)
... 46 more