<!----------------struts.xml ?----------------->

<package name="ssh" extends="struts-default" namespace="/">

? ? ?<action name="product_*" class="productAction" method="{1}">

? ? ? ? ?

? ? ?</action>

? </package>

<!---------------- applicationContext.xml ?----------------->

?<!-- 配置Action的類 -->

? ? <bean id="productAction" class="action.ProductAction" scope="prototype">

? ? ?<!-- 手動注入Service -->

? ? ?<property name="priductService" ref="productService"></property>

? ?</bean>?

? ?<!-- 配置業務層的類 -->

? ? <bean id="productService" class="service.ProductService">

? ? ? ?<property name="productDao" ref="productDao"/>

? ? </bean> ?

? <!-- 配置Dao類 -->

? ?<bean id="productDao" class="dao.ProductDao"> </bean>

<!----------------------------jsp----------------------->

<s:form action="product_save" method="post" namespace="/" theme="simple">

? ? ? ?<table border="1" width="400">

? ? ? ? ? ? <tr>

? ? ? ? ? ? ? ?<td>商品名稱</td>

? ? ? ? ? ? ? ? <td><s:textfield name="pname"/></td>

? ? ? ? ? ? </tr>

? ? ? ? ? ?<tr>

? ? ? ? ? ? ? ?<td>商品價格</td>

? ? ? ? ? ? ? ? <td><s:textfield name="price"></s:textfield></td>

? ? ? ? ? ? </tr>

? ? ? ? ? ? ?<tr>

? ? ? ? ? ? ? <td colspan="2"><input type="submit" value="添加"/></td>

? ? ? ? ? ? </tr>

? ? ? ?</table>

??

? </s:form>

<!-----------------------exection----------------->

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)

root cause

java.lang.NullPointerException
org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:827)
org.apache.struts2.components.UIBean.end(UIBean.java:535)
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:42)
org.apache.jsp.addProduct_jsp._jspx_meth_s_005ftextfield_005f0(addProduct_jsp.java:177)
org.apache.jsp.addProduct_jsp._jspx_meth_s_005fform_005f0(addProduct_jsp.java:133)
org.apache.jsp.addProduct_jsp._jspService(addProduct_jsp.java:80)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)