java.lang.ClassNotFoundException: org.apache.log4j.Level

Question

I'm trying to use hibernate 3.5.1 final in a swing application and here are the jars I'm using:

hibernate-core-3.5.1-Final
hibernate-entitymanager-3.5.1-Final
hibernate-jpa-2.0-api-1.0.0.Final
hibernate-annotations-3.5.1-Final
hibernate-commons-annotations-3.2.0.Final
dom4j-1.6.1
slf4j-api-1.6.4
slf4j-log4j12-1.6.4

When I try to run the application, I get the following error:

Failed to instantiate SLF4J LoggerFactory
Reported exception:
java.lang.NoClassDefFoundError: org/apache/log4j/Level
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:279)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:252)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:265)
    at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:165)
    at org.hibernate.ejb.Ejb3Configuration.<clinit>(Ejb3Configuration.java:127)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
    at com.xeno.xecamp.desktopManagement.Main.main(Main.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 11 more
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/log4j/Level
    at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)
    at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:108)
    at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:279)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:252)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:265)
    at org.hibernate.cfg.Configuration.<clinit>(Configuration.java:165)
    at org.hibernate.ejb.Ejb3Configuration.<clinit>(Ejb3Configuration.java:127)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:54)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
    at com.xeno.xecamp.desktopManagement.Main.main(Main.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Level
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

If you're trying to use symbolic links to attach your jar files, then see http://stackoverflow.com/questions/22240776/symlinking-tomcat-8-directory-resources — GlenPeterson, Oct 16 '14 at 20:11

score 40 · Accepted Answer · answered May 14 '12 at 14:52

40

You also need to include the Log4J JAR file in the classpath.

Note that slf4j-log4j12-1.6.4.jar is only an adapter to make it possible to use Log4J via the SLF4J API. It does not contain the actual implementation of Log4J.

answered May 14 '12 at 14:52

Jesper

202,709
46
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2

can you please tell me the maven dependency compatible with the version i am using ? – Mahmoud Saleh May 14 '12 at 14:55
9

well i just needed **log4j-1.2.16.jar** – Mahmoud Saleh May 14 '12 at 15:07
2

adding log4j-1.2.16.jar also solved the problem in my case but slf4j-log4j12-1.6.4.jar didn't – lizzie Jul 26 '13 at 16:46
actually adding maven dependency as such was not sufficient in my case, i also had to add the flag: build to make it run: log4j log4j 1.2.17 build – Macilias Nov 25 '15 at 16:49

score 5 · Answer 2 · answered May 14 '12 at 14:52

5

You need to download log4j and add in your classpath.

answered May 14 '12 at 14:52

elias

15,010
4
40
65

score 2 · Answer 3 · answered May 21 '18 at 03:36

2

In my environment, I just added the two files to class path. And is work fine.

slf4j-jdk14-1.7.25.jar
slf4j-api-1.7.25.jar

answered May 21 '18 at 03:36

wenchunl

21
1

Thanks, this worked for me in October 2019. I didn't even need the `log` jar, the `slf4j-jdk` took care of it. – Azurespot Oct 31 '19 at 03:22
This worked for me today oct 20th 2023. Except that my two files are of higher versions. – Dlaw Oct 20 '22 at 12:08

java.lang.ClassNotFoundException: org.apache.log4j.Level

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