Java/JSP log4j:WARN Please initialize the log4j system properly

Question

I'm currently doing java/jsp project and I couldn't initialize log4j correctly. What I want is when Apache Tomcat server starts, servlet should run pointing to "init.jsp". Within "init.jsp" there is the location where "log4j.xml" path. I want initialize log4j when aparche tomcat starts. followings are what I have done.

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Project01</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <servlet>
    <servlet-name>init</servlet-name>
    <jsp-file>/init.jsp</jsp-file>
    <load-on-startup>1</load-on-startup>
  </servlet>

</web-app>

init.jsp

<%@ page language="java" import="java.io.*,java.sql.*,javax.naming.*,java.util.*" errorPage="" buffer="none" %>
<%@page import="com.company.util.LogUtil"%>
<%    System.out.println("+++++++++++++++++++");     
%>
<%!

public void jspInit( javax.servlet.jsp.JspWriter out2)throws java.io.IOException{
    System.out.println("+++++++++Init++++++++++++");
    String rPath = getServletConfig().getServletContext().getRealPath("");

    out2.println("rPath  "+rPath);
//location of log4j.xml file
    LogUtil.init(rPath + "/conf/log4j.xml");
    LogUtil.getEventLog().debug("Log initialized");

}
%>
<%
jspInit(out);
%>

The problem is when I start the server, Server doesn't start "init.jsp". So console says

 log4j:WARN No appenders could be found for logger (Login).
 log4j:WARN Please initialize the log4j system properly.

But when I start "init.jsp" manually by right click on "init.jsp"page-> run as-> run on server, Then log4j works and logs are logging correctly.

Possible error point is "web.xml" dosen't call to "init.jsp" correctly. So "init.jsp" dosen't work when server starts. But I start "init.jsp" manually. All works fine.

Possible error point is "web.xml" dosen't call to "init.jsp" correctly. So "init.jsp" dosen't work when server starts. But I start "init.jsp" manually. All works fine. — Maleesha Ranawaka, Jan 30 '19 at 07:28

score 1 · Accepted Answer · answered Jan 30 '19 at 09:47

Its simple. Use this code as init.jsp.

<%@ page language="java"
    import="java.io.*,java.sql.*,javax.naming.*,java.util.*" errorPage=""
    buffer="none"%>
<%@page import="com.mobios.util.LogUtil"%>

<%
out.println("++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"+getServletConfig().getServletContext().getRealPath(""));

%>

<%!
public void jspInit(){
    System.out.println("+++++++++++++++++++Init+++++++++++++++++++++++++");
    String rPath = getServletConfig().getServletContext().getRealPath("");
    System.out.println("rPath "+rPath);
    LogUtil.init(rPath + "/conf/log4j.xml");
    LogUtil.getEventLog().debug("Service initialized,,,,,,,,,,,,,"); 

}
%>

Problem is at jspInit() function. Don't use parameters and remove out2.println (it use for print result in browser). And remove last function calling. This changes will make your init.jsp work

Java/JSP log4j:WARN Please initialize the log4j system properly

1 Answers1