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

我们的Tomcat服务器正在生成500个错误并抛出以下堆栈跟踪，但通过谷歌搜索根本原因（即utils.ManageIP.validIp）不会产生任何结果

为什么

utils.ManageIP.validIp

为空

下面是导致可爱异常的代码：

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.

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utils.ManageIP？它是什么？你自己的图书馆

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编辑：评论证明，这是一个遗留的开发代码。

utils.ManageIP？它是什么？你自己的图书馆？@Ursache ahhh难怪谷歌搜索一无所获源于原始开发的遗留代码。谢谢@Ursache请作为答案发布，谢谢！谢谢你的提议：）