Caused By java lang NoClassDefFoundError org apache log4j Logger

Question

I ve got an interesting problem in which the org apache log4j Logger class is not found during runtime  I m trying to get authorized and that is where it s failing   OAuthAuthorizer oauthAuthorizer   new OAuthAuthorizer OAUTH CONSUMER KEY  OAUTH CONSUMER SECRET  SAML PROVIDER ID  userId    I m using JDeveloper 11 1 1 6  Here is what I know    I ve looked in my UI war WEB-INF lib directory and I see the log4j-1 2 17 jar there  The class complaining about it is org opensaml xml XMLConfigurator  Caused by  java lang NoClassDefFoundError  org apache log4j Logger     at org opensaml xml XMLConfigurator  lt clinit gt  XMLConfigurator java 60      at org opensaml DefaultBootstrap initializeXMLTooling DefaultBootstrap java 195      at org opensaml DefaultBootstrap bootstrap DefaultBootstrap java 91      at com intuit ipp aggcat util SAML2AssertionGenerator getSAMLBuilder SAML2AssertionGenerator java 156      at com intuit ipp aggcat util SAML2AssertionGenerator createSubject SAML2AssertionGenerator java 187      at com intuit ipp aggcat util SAML2AssertionGenerator buildAssertion SAML2AssertionGenerator java 114      at com intuit ipp aggcat util SAML2AssertionGenerator generateSignedAssertion SAML2AssertionGenerator java 83      at com intuit ipp aggcat util SamlUtil createSignedSAMLPayload SamlUtil java 156      at com intuit ipp aggcat util OAuthUtil getOAuthTokens OAuthUtil java 60      at com intuit ipp aggcat core OAuthAuthorizer  lt init gt  OAuthAuthorizer java 85      at com incomemax view intuit WebUtil getAggCatService WebUtil java 91      Caused by  java lang ClassNotFoundException  org apache log4j Logger     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 305      at sun misc Launcher AppClassLoader loadClass Launcher java 301      at java lang ClassLoader loadClass ClassLoader java 246          64 more  I decomplied XMLConfigurator and oddly it doesn t import org apache log4j Logger It uses org slf4j Logger which is also in my jars directory  slf4j-api-1 7 5 jar   Also interesting is that line 60  see stack trace  is a blank line in my decompile  Of course if I add Logger xxxxx during design time  it finds it just fine  I m using the code jars directly from the sample java code  but imported into my existing application    I ve been scouring the web for answers and I believe I ve checked all the areas I can think of  I also referenced this very good page  http   myarch com classnotfound   Given authorization is step 1 in using the Intuit Developer API  I m kinda stuck   Adding output from  jhadesdev suggestion   All versions of log4j Logger     zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib log4j-1 2 17 jar  org apache log4j Logger class   All versions of log4j visible from the classloader of the OAuthAuthorizer class     zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib log4j-1 2 17 jar  org apache log4j Logger class   All versions of XMLConfigurator     jar file  C  Oracle Middleware11116 modules com bea core bea opensaml2 1 0 0 0 6-1-0-0 jar  org opensaml xml XMLConfigurator class zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib ipp-java-aggcat-v1-devkit-1 0 2 jar  org opensaml xml XMLConfigurator class zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib xmltooling-1 3 1 jar  org opensaml xml XMLConfigurator class   All versions of XMLConfigurator visible from the class loader of the OAuthAuthorizer class    jar file  C  Oracle Middleware11116 modules com bea core bea opensaml2 1 0 0 0 6-1-0-0 jar  org opensaml xml XMLConfigurator class zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib ipp-java-aggcat-v1-devkit-1 0 2 jar  org opensaml xml XMLConfigurator class zip C  Users Chris AppData Roaming JDeveloper system11 1 1 6 38 61 92 DefaultDomain servers DefaultServer tmp  WL user j2ee-app lt5l71 war WEB-INF lib xmltooling-1 3 1 jar  org opensaml xml XMLConfigurator class   I m still working on interpreting the results

User · Answer

Had the same problem  it was indeed caused by weblogic stupidly using its own opensaml implementation  To solve it  you have to tell it to load classes from WEB-INF lib for this package in weblogic xml        lt prefer-application-packages gt           lt package-name gt org opensaml   lt  package-name gt       lt  prefer-application-packages gt    maybe  lt prefer-web-inf-classes gt true lt  prefer-web-inf-classes gt  would work too

User · Answer

You can use the following maven dependency in your pom file  Otherwise  you can download the following two jars from net and add it to your build path     lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-api lt  artifactId gt       lt version gt 1 6 4 lt  version gt   lt  dependency gt    lt dependency gt       lt groupId gt org slf4j lt  groupId gt       lt artifactId gt slf4j-log4j12 lt  artifactId gt       lt version gt 1 6 4 lt  version gt   lt  dependency gt    This is copied from my working project  First make sure it is working in your project  Then you can change the versions to use any other versions  compatible jars     For AggCat  you can refer the POM file of the sample java application   https   github com IntuitDeveloperRelations IPP Sample Code blob master CustomerAccountData Java AggCatSampleApplication pom xml  Thanks

User · Answer

java lang ClassNotFoundException is indicate that class is not found in class path  it could be the version of log4j is not compatible  check for different log4j version

User · Answer

Check in Deployment Assembly    I have the same error  when i generate the war file with  the  maven clean install  way and deploy manualy  it works fine  but when i use the runtime enviroment  eclipse  the problems come   The solution for me  for eclipse IDE  go to    proyect properties  --   Deployment Assembly  --   Add  --   the jar you need   in my case java  build path entries   Maybe can help a litle

User · Answer

Based on the stacktrace  an intuit class com intuit ipp aggcat util SAML2AssertionGenerator needs a saml jar on the classpath   A saml class org opensaml xml XMLConfigurator needs on it s turn log4j  which is inside the WAR but cannot find it   One explanation for this is that the class XMLConfigurator that needs log4j was found not inside the WAR but on a downstream classloader  could a saml jar be missing from the WAR   The class XMLConfigurator that needs log4j cannot find it at the level of the classloader that loaded it  and the log4j version on the WAR is not visible on that particular classloader   In order to troubleshoot this  a way is to add this before the oauth call   System out println  all versions of log4j Logger      getClass   getClassLoader   getResources  org apache log4j Logger class       System out println  all versions of XMLConfigurator      getClass   getClassLoader   getResources  org opensaml xml XMLConfigurator class       System out println  all versions of XMLConfigurator visible from the classloader of the OAuthAuthorizer class      OAuthAuthorizer class getClassLoader   getResources  org opensaml xml XMLConfigurator class       System out println  all versions of log4j visible from the classloader of the OAuthAuthorizer class      OAuthAuthorizer class getClassloader   getResources  org apache log4j Logger class        Also if you are using Java 7  have a look at jHades  it s a tool I made to help troubleshooting these type of problems    In order to see what is going on  could you post the results of the classpath queries above   for which container is this happening  tomcat  jetty  It would be better to put the full stacktrace with all the caused by s in pastebin  just in case

User · Answer

I had the same issue  for me this fixed the issue  right click on the project - maven -  update project

User · Answer

With the suggestions  jhadesdev and the explanations from others  I ve found the issue here   After adding the code to see what was visible to the various class loaders I found this   All versions of log4j Logger     zip  lt snip gt war WEB-INF lib log4j-1 2 17 jar  org apache log4j Logger class  All versions of log4j visible from the classloader of the OAuthAuthorizer class     zip  lt snip gt war WEB-INF lib log4j-1 2 17 jar  org apache log4j Logger class  All versions of XMLConfigurator     jar  lt snip gt com bea core bea opensaml2 1 0 0 0 6-1-0-0 jar  org opensaml xml XMLConfigurator class   zip  lt snip gt war WEB-INF lib ipp-java-aggcat-v1-devkit-1 0 2 jar  org opensaml xml XMLConfigurator class   zip  lt snip gt war WEB-INF lib xmltooling-1 3 1 jar  org opensaml xml XMLConfigurator class  All versions of XMLConfigurator visible from the classloader of the OAuthAuthorizer class     jar  lt snip gt com bea core bea opensaml2 1 0 0 0 6-1-0-0 jar  org opensaml xml XMLConfigurator class   zip  lt snip gt war WEB-INF lib ipp-java-aggcat-v1-devkit-1 0 2 jar  org opensaml xml XMLConfigurator class   zip  lt snip gt war WEB-INF lib xmltooling-1 3 1 jar  org opensaml xml XMLConfigurator class   I noticed that another version of XMLConfigurator was possibly getting picked up  I decompiled that class and found this at line 60  where the error was in the original stack trace  private static final Logger log   Logger getLogger XMLConfigurator class   and that class was importing from org apache log4j Logger   So it was this class that was being loaded and used  My fix was to rename the jar file that contained this file as I can t find where I explicitly or indirectly load it  Which may pose a problem when I actually deploy   Thanks for all help and the much needed lesson on class loading

User · Answer

During runtime your application is unable to find the jar   Taken from this answer by Jared      It is important to keep two different exceptions straight in our head   in this case          java lang ClassNotFoundException This an Exception  it indicates that the   class was not found on the classpath  This indicates that we were   trying to load the class definition  and the class did not exist on   the classpath    java lang NoClassDefFoundError This is Error  it indicates that the JVM       looked in its internal class definition data structure for the       definition of a class and did not find it  This is different than       saying that it could not be loaded from the classpath  Usually this       indicates that we previously attempted to load a class from the       classpath  but it failed for some reason - now we re trying again        but we re not even going to try to load it  because we failed       loading it earlier  The earlier failure could be a       ClassNotFoundException or an ExceptionInInitializerError  indicating       a failure in the static initialization block  or any number of other       problems  The point is  a NoClassDefFoundError is not necessarily a       classpath problem       for similarities and differences

[java] Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger

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