Error 500 Org.apache.log4j.logger
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger up vote 21 down vote favorite 2 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.
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Log4j 1.x Migration API Configuration Web Applications and JSPs Lookups Appenders Layouts Filters Async Loggers Garbage-free Logging JMX Logging Separation https://logging.apache.org/log4j/2.x/manual/customloglevels.html Extending Log4j Plugins Programmatic Log4j Configuration Custom Log Levels In https://logging.apache.org/log4j/2.x/manual/configuration.html Code In Configuration Adding or Replacing Levels Custom Loggers Custom Logger Example Code Generation Tool Legacy Log4j 1.2 Log4j 2.3 Components API Implementation Commons Logging Bridge Log4j 1.2 API SLF4J Binding JUL Adapter Scala 2.10 API Scala 2.11 API Log4j 2 error 500 to SLF4J Adapter Apache Flume Appender Log4j Tag Library Log4j JMX GUI Log4j Web Application Support Log4j NoSQL support Log4j IO Streams Log4j Liquibase Binding Project Information Dependencies Dependency Convergence Dependency Management Project Team Mailing Lists Issue Tracking Project License Source Repository Project Summary Project Reports Changes Report JIRA Report Surefire Report error 500 org.apache.log4j.logger RAT Report Custom Log Levels Defining Custom Log Levels in Code Log4J 2 supports custom log levels. Custom log levels can be defined in code or in configuration. To define a custom log level in code, use the Level.forName() method. This method creates a new level for the specified name. After a log level is defined you can log messages at this level by calling the Logger.log() method and passing the custom log level: // This creates the "VERBOSE" level if it does not exist yet. final Level VERBOSE = Level.forName("VERBOSE", 550); final Logger logger = LogManager.getLogger(); logger.log(VERBOSE, "a verbose message"); // use the custom VERBOSE level // Create and use a new custom level "DIAG". logger.log(Level.forName("DIAG", 350), "a diagnostic message"); // Use (don't create) the "DIAG" custom level. // Only do this *after* the custom level is created! logger.log(Level.getLevel("DIAG"), "another diagnostic message"); // Using an undefined level results in an error: Level.getLevel()
Log4j 1.x Migration API Configuration Automatic Configuration Additivity Automatic Reconfiguration Chainsaw Support Configuration Syntax XML Syntax JSON Syntax Properties Syntax Configuring Loggers Configuring Appenders Configuring Filters Property Substitution Lookup Variables Scripts XInclude Composite Configurations Status Messages Unit Testing in Maven System Properties Web Applications and JSPs Lookups Appenders Layouts Filters Async Loggers Garbage-free Logging JMX Logging Separation Extending Log4j Plugins Programmatic Log4j Configuration Custom Log Levels Legacy Log4j 1.2 Log4j 2.3 Components API Implementation Commons Logging Bridge Log4j 1.2 API SLF4J Binding JUL Adapter Scala 2.10 API Scala 2.11 API Log4j 2 to SLF4J Adapter Apache Flume Appender Log4j Tag Library Log4j JMX GUI Log4j Web Application Support Log4j NoSQL support Log4j IO Streams Log4j Liquibase Binding Project Information Dependencies Dependency Convergence Dependency Management Project Team Mailing Lists Issue Tracking Project License Source Repository Project Summary Project Reports Changes Report JIRA Report Surefire Report RAT Report Configuration Inserting log requests into the application code requires a fair amount of planning and effort. Observation shows that approximately 4 percent of code is dedicated to logging. Consequently, even moderately sized applications will have thousands of logging statements embedded within their code. Given their number, it becomes imperative to manage these log statements without the need to modify them manually. Configuration of Log4j 2 can be accomplished in 1 of 4 ways: Through a configuration file written in XML, JSON, YAML, or properties format. Programmatically, by creating a ConfigurationFactory and Configuration implementation. Programmatically, by calling the APIs exposed in the Configuration interface to add components to the default configuration. Programmatically, by calling methods on the internal Logger class. This page focuses primarily on configuring Log4j through a configuration file. Information on programmatically configuring Log4j can be found at Extending Log4j 2 and Programmatic Log4j Configuration. Note that unlike Log4j 1.x, the public Log4j 2 API does not expose methods to add, modify or remove appenders and filters or manipulate the configuration in any way. Automatic Configuration Log4j has the ability to automatically configure itself during initialization. When Log4j starts it will locate all the ConfigurationFactory plugins and arrange them in weigh