非常にシンプルなカスタムtaglib関数が動作しない

Question

私のカスタムtaglib関数が機能していない理由を頭を悩ましている。この例では、Math.cosとMath.sinを使用しています。ここで

クラスです：呼び出し元のコードの

<taglib xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd" 
version="2.0"> 

<tlib-version>2.0</tlib-version> 
<uri>/WEB-INF/tags/math.tld</uri> 
<function> 
    <name>cos</name> 
    <function-class>foo.tags.Math</function-class> 
    <function-signature>java.lang.Double cos(java.lang.Double)</function-signature> 
</function> 
<function> 
    <name>sin</name> 
    <function-class>foo.tags.Math</function-class> 
    <function-signature>java.lang.Double sin(java.lang.Double)</function-signature> 
</function> 
</taglib> 

重要スニペット：

<%@ taglib prefix="math" uri="/WEB-INF/tags/math.tld" %> 
<span>${math:sin(180)}</span> 

私は、nullポインタ例外を取得しています

package foo.tags; 
public class Math { 
    public java.lang.Double cos(java.lang.Double value) { 
     return java.lang.Math.cos(value); 
    } 
    public java.lang.Double sin(java.lang.Double value) { 
     return java.lang.Math.sin(value); 
    } 
} 

ここ.TLDファイルですmath:sin(180)の行。誰かが私が間違っていることを見ていますか？より多くの情報が必要な場合はお知らせくださいが、例外自体は非常に有益ではありません。ありがとう！

EDITは、ここにスタックトレースです：

Mar 17, 2013 2:27:14 PM org.apache.catalina.core.StandardWrapperValve invoke 
SEVERE: Servlet.service() for servlet [Foo] in context with path [/Foo] threw exception [org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/svg/clock1.jsp at line 10 

[OTHER LINES REDACTED] 
10: <span>${math:sin(180)}</span> 
[OTHER LINES REDACTED] 

Stacktrace:] with root cause 
java.lang.NullPointerException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.apache.el.parser.AstFunction.getValue(AstFunction.java:112) 
    at org.apache.el.parser.AstMult.getValue(AstMult.java:39) 
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:189) 
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:985) 
    at org.apache.jsp.<REDACTED> 
    at org.apache.jsp.<REDACTED> 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) 
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:593) 
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:530) 
    at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:954) 
    at org.apache.jsp.<REDACTED> 
    at org.apache.jsp.<REDACTED> 
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432) 
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390) 
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) 
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471) 
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402) 
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) 
    at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238) 
    at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) 
    at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1047) 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:817) 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) 
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at Foo.page.filter.SimulationProgressFilter.doFilter(SimulationProgressFilter.java:88) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at fOO.page.filter.CurrentSessionStateFilter.doFilter(CurrentSessionStateFilter.java:119) 
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237) 
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999) 
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
    at java.lang.Thread.run(Unknown Source) 

Answer 1

あなたcosとsin方法はstaticする必要があります。