我正在向业务对象添加一个新 bean。
为此，我首先将成员添加到 PurchaseOrderDocument 类，方法是为其分配以下内容：
protected String purchaseOrderCurrentCMActionStatus;
然后我当然给它分配了通常的getter和setter，如下所示：
public String getPurchaseOrderCurrentCMActionStatus() {
return purchaseOrderCurrentCMActionStatus;
}
public void setPurchaseOrderCurrentCMActionStatus(String purchaseOrderCurrentCMActionStatus) {
this.purchaseOrderCurrentCMActionStatus = purchaseOrderCurrentCMActionStatus;
}
好的，这一切都发生在我的 Java 类中。
所以现在，在 DataDictionary 目录中名为 PurchaseOrderDocument.xml 的相应 XML 文件中，我添加了以下 bean 定义 -
<bean id="PurchaseOrderDocument-purchaseOrderCurrentCMActionStatus"
parent="PurchaseOrderDocument-purchaseOrderCurrentCMActionStatus-parentBean"/>
<bean id="PurchaseOrderDocument-purchaseOrderCurrentCMActionStatus-parentBean" abstract="true" parent="AttributeDefinition">
<property name="name" value="purchaseOrderCurrentCMActionStatus"/>
<property name="label" value="Current CM Action Status"/>
<property name="required" value="false"/>
<property name="shortLabel" value="CM Status"/>
<property name="control">
<ref bean="HiddenControl"/>
</property>
</bean>
接下来，我需要创建 OJB 映射，因此在 ojb.xml 文件中我添加了以下 XML 代码行 -
<field-descriptor name="purchaseOrderCurrentCMActionStatus" column="CURR_CM_ACTION_STATUS" jdbc-type="VARCHAR"/>
我还在相应的 TABLE 中创建了 CURR_CM_ACTION_STATUS 列 - 所以我双重和三次检查名称是否匹配。
对 -
所以问题来了：在我的 PurchaseOrderDocument 中，我有一个触发器，它等待一个事件，该事件将触发我在上面为此 bean 指定的“Setter”代码。奇怪的是，我编写的这段代码正在生成一个 NULL 指针异常。
我已将问题指向以下行 -
<bean id="PurchaseOrderDocument-purchaseOrderCurrentCMActionStatus-parentBean" abstract="true" parent="AttributeDefinition">
如果我更改以下行：
parent = "AttributeDefinition"
到
parent = "Note-noteText"
（Note 是一个类，noteText 是我最初在这个 bean 中继承的成员变量 - 但我不想再从 Note 类继承，我希望它在我的 PurchaseOrderDocument 类本地。无论如何，当我在那里有 Note-noteText，我没有得到空指针异常，而是在我的触发器调用“set”方法之后，没有将任何内容写入数据库，顺便说一下是 ORACLE。）
因此，这就是我放弃继承的原因，相反我希望这个 bean 对这个类是本地的。
我的一位同事提到，也许 Spring 正在 FORM 中寻找这个 bean，因为我没有它 - 它正在呕吐......但我有疑问。
另请注意，我正在使用隐藏控件。当我添加 parent="AttributeDefinition" 文本时，我收到一条错误消息，指出我没有指定控件属性。因为，这个 bean 不是从 USER 输入获取它的内容，所以我指定了这个 HIDDEN CONTROL 属性。
也许这是问题的一部分？？
这是堆栈跟踪以防万一-
堆栈跟踪：
org.apache.jasper.servlet.JspServletWrapper.handleJspException（JspServletWrapper.java:521）
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:412)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:101)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:92)
org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:50)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:167)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:121)
org.kuali.rice.kns.web.filter.SetResponseBufferSizeFilter.doFilter(SetResponseBufferSizeFilter.java:78)
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
org.kuali.rice.kns.web.filter.SessionFilter.doFilter(SessionFilter.java:41)
根本原因
javax.servlet.ServletException：javax.servlet.jsp.JspException：java.lang.NullPointerException
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:861)
org.apache.jasper.runtime.PageContextImpl.handlePageException（PageContextImpl.java:794）
org.apache.jsp.jsp.module.purap.PurchaseOrder_jsp._jspService(PurchaseOrder_jsp.java:269)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:101)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:92)
org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:50)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:167)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:121)
org.kuali.rice.kns.web.filter.SetResponseBufferSizeFilter.doFilter(SetResponseBufferSizeFilter.java:78)
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
org.kuali.rice.kns.web.filter.SessionFilter.doFilter(SessionFilter.java:41)
根本原因
java.lang.NullPointerException
org.kuali.rice.kns.datadictionary.exporter.AttributesMapBuilder.buildAttributeMap(AttributesMapBuilder.java:66)
org.kuali.rice.kns.datadictionary.exporter.AttributesMapBuilder.buildAttributesMap(AttributesMapBuilder.java:51)
org.kuali.rice.kns.datadictionary.exporter.DocumentEntryMapper.mapEntry(DocumentEntryMapper.java:88)
org.kuali.rice.kns.datadictionary.exporter.TransactionalDocumentEntryMapper.mapEntry(TransactionalDocumentEntryMapper.java:30)
org.kuali.rice.kns.datadictionary.exporter.DataDictionaryMap.get(DataDictionaryMap.java:60)
javax.el.MapELResolver.getValue(MapELResolver.java:51)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)
org.apache.el.parser.AstValue.getValue(AstValue.java:123)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:938)
org.apache.jsp.tag.web.kr.documentPage_tag._jspx_meth_c_005fset_005f0(documentPage_tag.java:382)
org.apache.jsp.tag.web.kr.documentPage_tag.doTag(documentPage_tag.java:313)
org.apache.jsp.jsp.module.purap.PurchaseOrder_jsp._jspService(PurchaseOrder_jsp.java:260)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1085)
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:398)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:241)
org.kuali.rice.kns.web.struts.action.KualiRequestProcessor.process(KualiRequestProcessor.java:101)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.kuali.rice.kew.web.UserLoginFilter.doFilter(UserLoginFilter.java:92)
org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:50)
org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:167)
org.jasig.cas.client.authentication.AuthenticationFilter.doFilter(AuthenticationFilter.java:121)
org.kuali.rice.kns.web.filter.SetResponseBufferSizeFilter.doFilter(SetResponseBufferSizeFilter.java:78)
org.displaytag.filter.ResponseOverrideFilter.doFilter(ResponseOverrideFilter.java:125)
org.kuali.rice.kns.web.filter.SessionFilter.doFilter(SessionFilter.java:41)