请教这是什么类型的错误？

[dyfh]

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


root cause

java.lang.NullPointerException
org.apache.jsp.phsgl.phsaccount_jsp._jspService(phsaccount_jsp.java:415)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)


note The full stack trace of the root cause is available in the Tomcat logs.

[njeshop]

WEB-INF目录下的web.xml配置对吗？

[dyfh]

JAVA里提示的错误行是这句： out.print(vlst.size()-1);

[禽兽v5]

vlst这个对象为null，初始化语句怎么写的？

[hsdxhc]

在这句之前加System.out.println(vlst);
应该是vlst为null.

[dyfh]

Vector vlst=null;
if (opertid=="none"){
vlst=getAllPersons();
}else
{
if (opertid.equals("query"))
{
String sv=request.getParameter("valuestr");
String[] asv=sv.split(",");
vlst=getPersons(asv);
}else{

}

[chenxb1980]

vlst为null;
----
Vector vlst=null;
if (opertid=="none"){
vlst=getAllPersons();
}else
{
if (opertid.equals("query"))
{
String sv=request.getParameter("valuestr");
String[] asv=sv.split(",");
vlst=getPersons(asv);
}else{
//其他情况也要初始化
vlst = new Vector();

}

[追求自由]

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