Problem : You are getting Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger fault inward your Java application, which is using Log4j Logger either straight or indirectly via about pop Java framework similar Spring, Struts or Hibernate.
Cause : Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger fault indicates that JVM is non able to establish org.apache.log4j.Logger degree inward your application's CLASSPATH. Simplest argue of this fault is missing log4j.jar file. Since org.apache.log4j.Logger class belongs to this JAR file, if its non available at run-time in addition to thus your plan volition fail. Similar effect is java.lang.NoClassDefFoundError org.apache.log4j.Appender, which too comes due to missing log4j.jar inward CLASSPATH. You tin flaming banking concern tally that org.apache.log4j.Appender too belongs to log4j.jar file. If y'all don't know how in addition to thus allow me say y'all a quick tip. If y'all convey your projection setup in addition to thus y'all tin flaming exactly type Ctrl + T in addition to refer of degree e.g. org.apache.log4j.Logger and Eclipse volition demo all the degree file alongside same name along alongside the JAR file on which they are packaged. I oftentimes purpose this play tricks to discovery out whether a detail degree is introduce inward CLASSPATH or not.
Solution: If employment is caused due to missing log4j.jar file in addition to thus y'all tin flaming produce it past times adding relevant version of log4j.jar into your CLASSPATH. Now, which version of JAR file y'all should add together volition depend upon your application in addition to library y'all are using but at safer side y'all tin flaming e'er add together latest one. BTW, its worth remembering that at that spot is huge divergence betwixt Log4j in addition to Log4j2, which too provides asynchronous logging, thus brand certain y'all add together correct version of log4j library into your application's classpath.
You tin flaming download log4j.jar file either from Maven cardinal repository or straight from Apache Log4j website http://logging.apache.org/log4j/1.2/download.html. If y'all are using log4j ii e.g. for asynchronous logging in addition to thus y'all tin flaming download log4j2.jar from here. It exists inward same website but at dissimilar location.
If y'all are using Maven in addition to thus y'all tin flaming too add together next dependency inward your pom.xml file to download Log4j.jar
That's all well-nigh how to produce Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger fault inward Java application. In most of the cases, this effect volition acquire away every bit presently every bit y'all add together log4j.jar file but if it withal persist in addition to thus y'all postulate to carefully banking concern tally your CLASSPATH setting. You tin flaming run into hither to larn to a greater extent than well-nigh how to bargain alongside CLASSPATH intricacies inward Java.
Further Learning
Complete Java Masterclass
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Cause : Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger fault indicates that JVM is non able to establish org.apache.log4j.Logger degree inward your application's CLASSPATH. Simplest argue of this fault is missing log4j.jar file. Since org.apache.log4j.Logger class belongs to this JAR file, if its non available at run-time in addition to thus your plan volition fail. Similar effect is java.lang.NoClassDefFoundError org.apache.log4j.Appender, which too comes due to missing log4j.jar inward CLASSPATH. You tin flaming banking concern tally that org.apache.log4j.Appender too belongs to log4j.jar file. If y'all don't know how in addition to thus allow me say y'all a quick tip. If y'all convey your projection setup in addition to thus y'all tin flaming exactly type Ctrl + T in addition to refer of degree e.g. org.apache.log4j.Logger and Eclipse volition demo all the degree file alongside same name along alongside the JAR file on which they are packaged. I oftentimes purpose this play tricks to discovery out whether a detail degree is introduce inward CLASSPATH or not.
Solution: If employment is caused due to missing log4j.jar file in addition to thus y'all tin flaming produce it past times adding relevant version of log4j.jar into your CLASSPATH. Now, which version of JAR file y'all should add together volition depend upon your application in addition to library y'all are using but at safer side y'all tin flaming e'er add together latest one. BTW, its worth remembering that at that spot is huge divergence betwixt Log4j in addition to Log4j2, which too provides asynchronous logging, thus brand certain y'all add together correct version of log4j library into your application's classpath.
You tin flaming download log4j.jar file either from Maven cardinal repository or straight from Apache Log4j website http://logging.apache.org/log4j/1.2/download.html. If y'all are using log4j ii e.g. for asynchronous logging in addition to thus y'all tin flaming download log4j2.jar from here. It exists inward same website but at dissimilar location.
<dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.15</version> </dependency>If y'all are using log4j version ii in addition to thus y'all tin flaming add together next Maven dependency :
<dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.3</version> </dependency>
That's all well-nigh how to produce Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger fault inward Java application. In most of the cases, this effect volition acquire away every bit presently every bit y'all add together log4j.jar file but if it withal persist in addition to thus y'all postulate to carefully banking concern tally your CLASSPATH setting. You tin flaming run into hither to larn to a greater extent than well-nigh how to bargain alongside CLASSPATH intricacies inward Java.
Further Learning
Complete Java Masterclass
solution]
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