【求助】一个关于http status 500 的错误。。。

xhmaxhma

本人不是很懂jsp，所以在此请教个关于http status 500 的问题。 先谢谢大家了！
该jsp文件是个支付网关的接口文件，由于测试过程中出现的。所以请各位帮忙看下是社么错误？ 如 另外我们公司内部测试时只有一台机器不会报这个错，浏览器为IE7.0和FireFox 其他同事的都会有这个错误。。。

错误代码如下：
HTTP Status 500 -

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type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Couldn't perform transform with stylesheet [/WEB-INF/templates/Default/card_selection.xslt] in XSLT view with name [CardSelectionView]; nested exception is net.sf.saxon.trans.DynamicError: An empty sequence is not allowed as the value of variable $testresult
        com.protx.vsp.web.view.DynamicXsltView.doTransform(DynamicXsltView.java:467)
        com.protx.vsp.web.view.DynamicXsltView.doTransform(DynamicXsltView.java:373)
        com.protx.vsp.web.view.CardSelectionView.doTransform(CardSelectionView.java:64)
        com.protx.vsp.web.view.DynamicXsltView.renderMergedOutputModel(DynamicXsltView.java:283)
        org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:249)
        org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1105)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:841)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:755)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:396)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:350)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        com.protx.vsp.web.ParameterCleanUpFilter.doFilter(ParameterCleanUpFilter.java:60)


root cause

net.sf.saxon.trans.DynamicError: An empty sequence is not allowed as the value of variable $testresult
        net.sf.saxon.expr.Expression.typeError(Expression.java:791)
        net.sf.saxon.expr.CardinalityChecker.evaluateItem(CardinalityChecker.java:291)
        net.sf.saxon.functions.StringLength.evaluateItem(StringLength.java:95)
        net.sf.saxon.expr.CompareToIntegerConstant.effectiveBooleanValue(CompareToIntegerConstant.java:194)
        net.sf.saxon.instruct.Choose.iterate(Choose.java:409)
        net.sf.saxon.expr.Atomizer.iterate(Atomizer.java:96)
        net.sf.saxon.expr.UntypedAtomicConverter.iterate(UntypedAtomicConverter.java:130)
        net.sf.saxon.functions.StringJoin.evaluateItem(StringJoin.java:4
        net.sf.saxon.expr.CastExpression.evaluateItem(CastExpression.java:27
        net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:361)
        net.sf.saxon.expr.LetExpression.eval(LetExpression.java:229)
        net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:396)
        net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:9
        net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:317)
        net.sf.saxon.Controller.transformDocument(Controller.java:1705)
        net.sf.saxon.Controller.transform(Controller.java:1513)
        com.protx.vsp.web.view.DynamicXsltView.doTransform(DynamicXsltView.java:456)
        com.protx.vsp.web.view.DynamicXsltView.doTransform(DynamicXsltView.java:373)
        com.protx.vsp.web.view.CardSelectionView.doTransform(CardSelectionView.java:64)
        com.protx.vsp.web.view.DynamicXsltView.renderMergedOutputModel(DynamicXsltView.java:283)
        org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:249)
        org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1105)
        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:841)
        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:755)
        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:396)
        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:350)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        com.protx.vsp.web.ParameterCleanUpFilter.doFilter(ParameterCleanUpFilter.java:60)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.13 logs.


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Apache Tomcat/6.0.13

ubac

An empty sequence is not allowed as the value of variable $testresult

依照异常来说，应该是队列是空值，具体的，没有代码，所以就无从细究了