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Exception in thread “main” java.lang.NoClassDefFoundError: org/slf4j/ILoggerFactory

 
Greenhorn
Posts: 4
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I am trying to use log4j.2.x in an Eclipse project for logging. My conf file named as log4j2.xml is directly under java project and I have necessary jars in classpath. When I test, I see below error messages. Can anybody tell me the solution for this?

log4j2.xml:
<?xml version="1.0" encoding="UTF-8"?>
<configuration status="WARN">
<appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</appenders>
<loggers>
<root level="error">
<appender-ref ref="Console"/>
</root>
</loggers>
</configuration>


Errors in Console:
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/ILoggerFactory
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:186)
at org.apache.logging.slf4j.SLF4JLoggerContextFactory.<init>(SLF4JLoggerContextFactory.java:34)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:84)
at Browserbot.<clinit>(Browserbot.java:17)Caused by: java.lang.ClassNotFoundException: org.slf4j.ILoggerFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ... 23 more


My Java Class File:
public class Browserbot {
static Logger logger = LogManager.getLogger(Browserbot.class.getName());

public static void main(String[] args){

logger.error("File Not Found");}}
 
Sheriff
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Well, it appears that you don't actually have all of the necessary jars in the classpath. Apparently you're using SLF4J; you're going to need the jars for that.
 
Paul Clapham
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And, welcome to the Ranch!
 
Srikanth Nakkaa
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Thanks Paul.. I will download sl4j jars and place in classpath..!!
 
Been there. Done that. Went back for more. But this time, I took this tiny ad with me:
Java file APIs (DOC, XLS, PDF, and many more)
https://products.aspose.com/total/java
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