Error 500 Java.lang.noclassdeffounderror Org.apache.log4j.priority
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Java Problem : You are getting Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger error in your Java application, which is using Log4j Logger either directly or indirectly via some popular Java framework like Spring, Struts or Hibernate. Cause : Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger error indicates that JVM is not able to found org.apache.log4j.Logger class in your application's CLASSPATH. Simplest reason of this error is missing log4j.jar file. Since org.apache.log4j.Logger class belongs to this JAR file, if its not available at run-time then your program will fail. Similar issue is java.lang.NoClassDefFoundError org.apache.log4j.Appender, which also comes due to missing log4j.jar in CLASSPATH. You can check http://stackoverflow.com/questions/20909446/caused-by-java-lang-noclassdeffounderror-org-apache-log4j-logger that org.apache.log4j.Appender also belongs to log4j.jar file. If you don't know how then let me tell you a quick tip. If you have your project setup then you can simply type Ctrl+ T and name of class e.g.org.apache.log4j.Loggerand Eclipse will show all the class file with samename along with the JAR file on which they are packaged. I often use this trick to find http://www.java67.com/2015/08/caused-by-javalangnoclassdeffounderror-org-apache-log4j-Logger.html out whether a particular class is present in CLASSPATH or not. Solution: If problem is caused due to missing log4j.jar file then you can fix it by adding relevant version of log4j.jar into your CLASSPATH. Now, which version of JAR file you should add will depend upon your application and library you are using but at safer side you can always add latest one. BTW, its worth remembering that there is huge difference between Log4j and Log4j2, which also provides asynchronous logging, so make sure you add right version of log4j library into your application's classpath. You can download log4j.jar file either from Maven central repository or directly from Apache Log4j website http://logging.apache.org/log4j/1.2/download.html. If you are using log4j 2 e.g. for asynchronous logging then you can download log4j2.jar from here. It exists in same website but at different location. If you are using Maven then you can also add following dependency in your pom.xml file to download Log4j.jar
java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory or "Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory" exception comes http://javarevisited.blogspot.com/2012/02/orgapachecommonslogginglogfactory-error.html when you don't apache commons-logging-1.1.1.jar in your Classpath. I have faced this exception many times while using open source framework like Struts, http://www.webdeveloper.com/forum/showthread.php?77688-log4j-java-lang-NoClassDefFoundError Spring and Displaytag which uses commons-logging framework for logging. commons-logging is not an actual java logging framework but provides a wrapper so error 500 that you can use log4j, java logging or any other Java logging framework. commons-logging is also smart enough to detect which logging framework are you using e.g if you are using log4j it can detect it by looking log4j.jar in your classpath. but if error 500 java.lang.noclassdeffounderror you don't have commons-logging.jar in your classpath you may get java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory at runtime even if your application gets deployed successfully. Cause of java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory Real cause of "Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory" or "java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory" is JVM not able to locate commons-logging-1.1.1.jar in classpath but it may surface differently on different environment. Some time even you get this error even if you already have commons-logging-1.1.1.jar in classpath and many times it different reasons for different environment. It gets more difficult on managed environment like J2EE web servers and application servers where different classloader loads different classes e.g. AppClassLoader is responsible for loading web application but classes inside lib directory of web server e.g. tomcat is loaded by another classloader. So you can also get "java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory" if commons-l
this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Results 1 to 7 of 7 Thread: log4j java.lang.NoClassDefFoundError Tweet Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 08-31-2005,07:02 AM #1 bioS View Profile View Forum Posts Visit Homepage Registered User Join Date Feb 2003 Location Geneva Posts 39 log4j on Resin problem Hi, I wrote a small web application in Java which implements log4j. I wrote it on my personnal computer which runs Linux. When I try to run it on my website (which is a Windows server), I get some errors. I sometimes get this one: Code: 500 Servlet Exception java.lang.NoSuchFieldError: level at org.apache.log4j.spi.RootLogger.setLevel(RootLogger.java:65) at org.apache.log4j.spi.RootLogger.