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Java 尝试运行Struts Dispatcher时出现NullPointerException

java jsp

Java 尝试运行Struts Dispatcher时出现NullPointerException,java,jsp,nullpointerexception,struts,struts-config,Java,Jsp,Nullpointerexception,Struts,Struts Config,我试图用Dispatcher运行一个简单的Struts示例，但我发现了以下错误 SEVERE: Servlet.service() for servlet [jsp] in context with path [/StrutsDispatcher] threw exception [java.lang.NullPointerException: Module 'null' not found.] with root cause java.lang.NullPointerException: M

我试图用Dispatcher运行一个简单的Struts示例，但我发现了以下错误

SEVERE: Servlet.service() for servlet [jsp] in context with path [/StrutsDispatcher] threw 
exception [java.lang.NullPointerException: Module 'null' not found.] with root cause
java.lang.NullPointerException: Module 'null' not found.
at org.apache.struts.taglib.TagUtils.getModuleConfig(TagUtils.java:755)
at org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:364)
at org.apache.struts.taglib.TagUtils.computeURLWithCharEncoding(TagUtils.java:285)
at org.apache.struts.taglib.html.LinkTag.calculateURL(LinkTag.java:445)
下面是我的JSP页面和
struts配置
code:

<?xml version="1.0" encoding="UTF-8"?>    
    <!DOCTYPE struts-config PUBLIC    
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"   
          "http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>    
    <display-name> Dispatcher demo</display-name>    
    <description>Dispatcher beginning </description>

    <form-beans>    
        <form-bean name="DispatchActionForm" type="org.strutsDispatcher.DispatcherActionForm"></form-bean>    
    </form-beans>

    <action-mappings>    
        <action path="/test" type="org.strutsDispatcher.DispatchActionTest"    
            parameter="parameter" input="/dispatchAction.jsp"  name="DispatchActionForm"    
            scope="request" validate="false">    
            <forward name="add" path="/dispathcerActionAdd.jsp"></forward>    
            <forward name="save" path="/dispathcerActionSave.jsp"></forward>    
            <forward name="edit" path="/dispathcerActionEdit.jsp"></forward>    
        </action>    
    </action-mappings>

</struts-config>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
 "http://www.w3.org/TR/html4/loose.dtd">
  <%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
</head>
<body>
 <h3>Dispatcher Action Example</h3>
 <p><html:link page="test.do&#63;parameter=add">Call Add section</html:link>  
 <p><html:link page="test.do&#63;parameter=edit">Call Edit Section</html:link></p>
 <p><html:link page="test.do&#63;parameter=save">Call Save Section</html:link></p> 
</body>
</html>

stuts配置文件：

<?xml version="1.0" encoding="UTF-8"?>    
    <!DOCTYPE struts-config PUBLIC    
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"   
          "http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>    
    <display-name> Dispatcher demo</display-name>    
    <description>Dispatcher beginning </description>

    <form-beans>    
        <form-bean name="DispatchActionForm" type="org.strutsDispatcher.DispatcherActionForm"></form-bean>    
    </form-beans>

    <action-mappings>    
        <action path="/test" type="org.strutsDispatcher.DispatchActionTest"    
            parameter="parameter" input="/dispatchAction.jsp"  name="DispatchActionForm"    
            scope="request" validate="false">    
            <forward name="add" path="/dispathcerActionAdd.jsp"></forward>    
            <forward name="save" path="/dispathcerActionSave.jsp"></forward>    
            <forward name="edit" path="/dispathcerActionEdit.jsp"></forward>    
        </action>    
    </action-mappings>

</struts-config>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
 "http://www.w3.org/TR/html4/loose.dtd">
  <%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
</head>
<body>
 <h3>Dispatcher Action Example</h3>
 <p><html:link page="test.do&#63;parameter=add">Call Add section</html:link>  
 <p><html:link page="test.do&#63;parameter=edit">Call Edit Section</html:link></p>
 <p><html:link page="test.do&#63;parameter=save">Call Save Section</html:link></p> 
</body>
</html>


调度程序演示
调度员开始
JSP页面：

<?xml version="1.0" encoding="UTF-8"?>    
    <!DOCTYPE struts-config PUBLIC    
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"   
          "http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>    
    <display-name> Dispatcher demo</display-name>    
    <description>Dispatcher beginning </description>

    <form-beans>    
        <form-bean name="DispatchActionForm" type="org.strutsDispatcher.DispatcherActionForm"></form-bean>    
    </form-beans>

    <action-mappings>    
        <action path="/test" type="org.strutsDispatcher.DispatchActionTest"    
            parameter="parameter" input="/dispatchAction.jsp"  name="DispatchActionForm"    
            scope="request" validate="false">    
            <forward name="add" path="/dispathcerActionAdd.jsp"></forward>    
            <forward name="save" path="/dispathcerActionSave.jsp"></forward>    
            <forward name="edit" path="/dispathcerActionEdit.jsp"></forward>    
        </action>    
    </action-mappings>

</struts-config>

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
 "http://www.w3.org/TR/html4/loose.dtd">
  <%@taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>Insert title here</title>
</head>
<body>
 <h3>Dispatcher Action Example</h3>
 <p><html:link page="test.do&#63;parameter=add">Call Add section</html:link>  
 <p><html:link page="test.do&#63;parameter=edit">Call Edit Section</html:link></p>
 <p><html:link page="test.do&#63;parameter=save">Call Save Section</html:link></p> 
</body>
</html>


在此处插入标题
调度程序操作示例
呼叫添加部分
调用编辑部分

呼叫保存部分
html:link标记属性
页面
的值不正确，链接标记实现无法对其求值以创建url。如果您使用的是希望url指向的操作，则使用“操作”属性

<html:link action="/test"><html:param name="parameter" value="save"/></html:link>
其他链接也是如此

看看这个问题：@TroyAndAbed，在我发布我的问题之前，我确实看到了那篇帖子他们给出的建议，我尝试了所有建议，但都没有奏效，为什么要重新发布呢