[ http://issues.apache.org/struts/browse/WW-1273?page=all ]
tm_jee resolved WW-1273:
------------------------
Resolution: Fixed
> freemarker 'parameters' model attribute - incorrect TemplateModel
> -----------------------------------------------------------------
>
> Key: WW-1273
> URL: http://issues.apache.org/struts/browse/WW-1273
> Project: Struts Action 2
> Type: Bug
> Components: Views
> Versions: WW 2.2.1, WW 2.2.2
> Environment: FreeMarker 2.3.4, 2.3.6; using recommended FreeMarker 'result
> type'
> Reporter: Vladimir Olenin
> Assignee: tm_jee
> Priority: Critical
> Fix For: 2.0
>
> There seems to be a very nasty bug with FreeMarker, which still hasn't been
> fixed. To access url parameter values one should use 'parameters' variable
> (btw, this is not documented anywhere, eg, it's not on the 'FreeMarker'
> integration page in the list of other variable accessible from FreeMarker
> view).
> The problem with 'parameters' variable is that it seems like incorrect
> TemplateModel is currently used, specifically 'ArrayModel', while it should
> be 'HashModel' or smth similar. I'm a novice with FreeMarker, so it might
> also be something else, but one thing I confirmed is that FreeMarker supplied
> freemarker.ext.servlet.FreemarkerServlet exposes url parameters through
> RequestParameters attribute correctly and it is using
> HttpRequestParametersHashModel).
> This bug makes it currently impossible to access parameter values by name,
> eg, by using ${parameters.param1} to access 'param1' value in the url
> http://smth.com/test.action?param1=xxx. The above attempt will result in the
> following exception:
> ======================================
> Expecting a string, date or number here, Expression parameters.message is
> instead a freemarker.ext.beans.ArrayModel
> The problematic instruction:
> ----------
> ==> ${parameters.param1} [on line 8, column 13 in test.ftl]
> ----------
> Java backtrace for programmers:
> ----------
> freemarker.core.NonStringException: Error on line 8, column 15 in test.ftl
> Expecting a string, date or number here, Expression parameters.message is
> instead a freemarker.ext.beans.ArrayModel
> at freemarker.core.Expression.getStringValue(Expression.java:126)
> at freemarker.core.Expression.getStringValue(Expression.java:93)
> at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
> at freemarker.core.Environment.visit(Environment.java:196)
> at freemarker.core.MixedContent.accept(MixedContent.java:92)
> at freemarker.core.Environment.visit(Environment.java:196)
> at freemarker.core.Environment.process(Environment.java:176)
> at freemarker.template.Template.process(Template.java:232)
> at
> com.opensymphony.webwork.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:130)
> at
> com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:101)
> at
> com.opensymphony.xwork.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:312)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:207)
> at
> com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:137)
> at
> com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:115)
> at
> com.opensymphony.xwork.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:81)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:151)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:100)
> at
> com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
> at
> com.opensymphony.xwork.DefaultActionProxy.execute(DefaultActionProxy.java:113)
> at
> com.opensymphony.webwork.dispatcher.DispatcherUtils.serviceAction(DispatcherUtils.java:233)
> at
> com.opensymphony.webwork.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:198)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
> at
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
> at
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
> at
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
> at
> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
> at
> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
> at
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
> at java.lang.Thread.run(Thread.java:595)
> ============================
> while following call: ${parameters}, will printout what seems to be
> 'toString' call of List:
> {param1=[Ljava.lang.String;@6210fb, param2=[Ljava.lang.String;@48edb5}
> As I mentioned, if _original Freemarker's_ FreemarkerServlet is used to
> render the view, variable access like ${RequestParameters.param1} work just
> fine.
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