java - Tomcat 异常 : java. lang.NullPointerException utils.ManageIP.validIp (ManageIP.java:113)

Question

我们的 Tomcat 服务器正在生成 500 个错误并吐出以下堆栈跟踪，但谷歌搜索根本原因(即 utils.ManageIP.validIp)没有产生任何结果。

为什么 utils.ManageIP.validIp 为空？

这是导致异常的代码:

String IP = request.getRemoteAddr();
if (!utils.ManageIP.validIp(IP)) {
   // Do stuff
}

困惑。有什么想法吗？

org.apache.jasper.JasperException: java.lang.NullPointerException
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:541)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:694)
    org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:665)
    org.apache.jsp.admin_jsp._jspService(admin_jsp.java:87)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause

java.lang.NullPointerException
    utils.ManageIP.validIp(ManageIP.java:113)
    org.apache.jsp.jsp.mainMenu_jsp._jspService(mainMenu_jsp.java:88)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:694)
    org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:665)
    org.apache.jsp.admin_jsp._jspService(admin_jsp.java:87)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.

Answer 1

utils.ManageIP?它是什么？你自己的图书馆？

编辑:评论证明，这是遗留的开发代码。