[error]SerializerToXML.writeAttrString

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博客记录了2005年10月19日的Java空指针异常信息，包含异常调用栈，涉及多个Java类和方法。还提到创建Table节点时，若setAttribute方法里的nowColumnNum为null会报错。

Oct 19 18:48:23 2005: java.lang.NullPointerException
Oct 19 18:48:23 2005:   at org.apache.xalan.serialize.SerializerToXML.writeAttrString(SerializerToXML.java:2229)
Oct 19 18:48:23 2005:   at org.apache.xalan.serialize.SerializerToXML.processAttribute(SerializerToXML.java:1084)
Oct 19 18:48:23 2005:   at org.apache.xalan.serialize.SerializerToXML.startElement(SerializerToXML.java:944)
Oct 19 18:48:23 2005:   at org.apache.xalan.transformer.TransformerIdentityImpl.startElement(TransformerIdentityImpl.java:1017)
Oct 19 18:48:23 2005:   at org.apache.xml.utils.TreeWalker.startNode(TreeWalker.java:346)
Oct 19 18:48:23 2005:   at org.apache.xml.utils.TreeWalker.traverse(TreeWalker.java:167)
Oct 19 18:48:23 2005:   at org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:325)
Oct 19 18:48:23 2005:   at com.sdpcpa.oa.pub.TransOption.saveConfig(TransOption.java:1543)
Oct 19 18:48:23 2005:   at com.sdpcpa.oa.pub.TransOption.doPost(TransOption.java:388)
Oct 19 18:48:23 2005:   at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
Oct 19 18:48:23 2005:   at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.JagServlet.service(JagServlet.java:657)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.JagRequestDispatcher.service(JagRequestDispatcher.java:958)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.JagWebResource.service(JagWebResource.java:90)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.JagFilterChain.doFilter(JagFilterChain.java:133)
Oct 19 18:48:23 2005:   at com.bsm.systemManage.pub.CheckValidUserFilter.doFilter(CheckValidUserFilter.java:166)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.JagFilterChain.doFilter(JagFilterChain.java:107)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.ServletEngine._service(ServletEngine.java:868)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.ServletEngine.service(ServletEngine.java:344)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet.ServletServiceImpl.doService(ServletServiceImpl.java:58)
Oct 19 18:48:23 2005:   at com.sybase.jaguar.servlet._sk_JaguarServlet_ServletService.invoke(_sk_JaguarServlet_ServletService.java:143)
^[[?1;2cOct 19 18:48:23 2005: StaticPageCache_get: timeout: url = /sdpcpa/template/images/default.swf
Oct 19 18:48:29 2005: nowSession==com.sybase.jaguar.servlet.JagHttpSession@56aef8

//创建Table节点
temp_subModel_element.appendChild(doc.createTextNode("/n/t/t/t"));
Element temp_table_element = doc.createElement("Table");
temp_table_element.setAttribute("TableName", mayCfgTableName);
temp_table_element.setAttribute("TableLabel", mayCfgTablelabel);
if(nowColumnNum != null)
temp_table_element.setAttribute("Fields", nowColumnNum);
else
temp_table_element.setAttribute("Fields", "");
temp_table_element.setAttribute("rows", "");
temp_table_element.setAttribute("Fails", "");
temp_subModel_element.appendChild(temp_table_element);
temp_subModel_element.appendChild(doc.createTextNode("/n/t/t"));

如果setAttribute(("Fields", nowColumnNum)里的nowColumnNum为null，则会报此错