Java/JSP/Customized Tag

Logger for tag

/*
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
        PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
  "http://java.sun.ru/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
  
  <tlib-version>1.0</tlib-version>
  <jsp-version>1.2</jsp-version>
  <short-name>cbck</short-name>
  <description>Cookbook custom tags</description>
  <uri>com.jexp.tags</uri>
  
  <tag>
    <name>log</name>
    <tag-class>com.jexp.LoggerTag</tag-class>
    <body-content>JSP</body-content>
    <description>This tag uses log4j to log a message.</description>
    <attribute>
      <name>configFile</name>
    <required>false</required>
    <rtexprvalue>false</rtexprvalue>
    <description>This attribute provides any configuration file name for the logger. The file must be located in WEB-INF/classes</description>
    </attribute>
    
    <attribute>
       <name>level</name>
     <required>true</required>
     <rtexprvalue>false</rtexprvalue>
     <description>This attribute provides the level for the log request.</description>
    </attribute>
    </tag>
</taglib>
*/
//Log4j from Apache is required
package com.jexp;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import java.lang.reflect.Method;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class LoggerTag extends BodyTagSupport {
  private Logger log = null;
  private String configFile = null;
  private String level = null;
  private final static String[] LEVELS = { "debug", "info", "warn", "error",
      "fatal" };
  public void setConfigFile(String fileName) {
    this.configFile = fileName;
  }
  public void setLevel(String level) {
    this.level = level;
  }
  public int doEndTag() throws JspException {
    if (configFile != null)
      PropertyConfigurator.configure(pageContext.getServletContext()
          .getRealPath("/")
          + "WEB-INF/classes/" + configFile);
    level = level.toLowerCase();
    if (!contains(level))
      throw new JspException(
          "The value given for the level attribute is invalid.");
    log = Logger.getLogger(LoggerTag.class);
    String message = getBodyContent().getString().trim();
    Method method = null;
    try {
      method = log.getClass().getMethod(level,
          new Class[] { Object.class });
      method.invoke(log, new String[] { message });
    } catch (Exception e) {
    }
    return EVAL_PAGE;
  }
  public void release() {
    log = null;
    configFile = null;
    level = null;
  }
  private boolean contains(String str) {
    for (int i = 0; i < LEVELS.length; i++) {
      if (LEVELS[i].equals(str))
        return true;
    }
    return false;
  }
}