Error Could Not Instantiate Appender Named File
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Log4j:error Could Not Instantiate Appender Named "r".
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 Log4j appender could not be instantiated up vote 2 down vote favorite javascript could not find value for language I'm following a tutorial on Log4j logging in web applications. This is my log4j.properties file: #log to console log4j.rootLogger=INFO, , demoappender log4j.appender.demoappender=org.apache.log4j.ConsoleAppender log4j.appender.demoappender=System.out log4j.appender.demoappender.layout=org.apache.log4j.PatternLayout log4j.appender.demoappender.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n I am instantiating the logger using an init() method: private Logger logger = null; public void init(ServletConfig config) throws ServletException { logger = Logger.getRootLogger(); } This is where I try to log some sample messages: protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { logger.info("logging INFO message"); logger.error("logging ERROR message"); logger.warn("loggging WARNING message"); logger.fatal("logging FATAL message"); response.setContentType("text/html"); When I run the servlet on Tomcat, I get this error on the console: log4j:ERROR Could not find value for key log4j.appender. log4j:ERROR Could not instantiate appender named "". log4j:ERROR Could not instantiate class [System.out]. java.lang.ClassNotFoundException: System.out at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:190) at org.apache.log4j.helpers.Loader.loadClass(Loader.java:198) at org.apache
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss http://stackoverflow.com/questions/23281667/error-cannot-log-with-log4j 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 https://coderanch.com/t/429904/open-source/Log-appender-stdout-Error 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 could not other. Join them; it only takes a minute: Sign up Error - cannot log with log4j up vote 3 down vote favorite I am trying to use log4j 1.2 jar in my hibernate 3.1 (in eclipse) example project. The java code runs perfecly, but the console shows me the following log4j warnings - log4j:ERROR Could not find value error could not for key log4j.appender.stdout log4j.logger.org.hibernate.info log4j:ERROR Could not instantiate appender named "stdout log4j.logger.org.hibernate.info". I have referenced the following - log4j-1.2.17.jar slf4j-api-1.6.0.jar slf4j-simple-1.6.0.jar My log4j.properties file contains - ### Direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - ### log4j.rootLogger=warn, stdout log4j.logger.org.hibernate.info ### log JDBC bind parameters ### log4j.logger.org.hibernate.type=debug ###log schema export/update ### log4j.logger.org.hibernate.tool.hbm2ddl=debug How do I fix these warnings ? I am new to logging and I need some help to figure it out. Thanks. java logging log4j share|improve this question edited Apr 24 '14 at 23:46 asked Apr 24 '14 at 23:29 Borat Sagdiyev 1,90611734 add a comment| 1 Answer 1 active oldest votes up vote 5 down vote accepted This line: ### Set Log Levels - ### log4j.rootLogger=warn, stdout log4j.logger.org.hibernate=info Should be broken into two lines: log4j.rootLogger=warn, stdout log4j.logger.org.hibernate=info Wow ! As a newbie. I would have never figured out something like this. The code I use finally is here - ### Direct log4j properties to STDOUT ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=
This Site Careers Other all forums Forum: Other Open Source Projects Log4j appender,stdout Error peter aerts Ranch Hand Posts: 32 I like... posted 7 years ago Hello. I have this Error when i run tomcat.i want to know that is it important? and how can i fix it? please help me. log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a "org.apache.log4j.Appender" variable. log4j:ERROR The class "org.apache.log4j.Appender" was loaded by log4j:ERROR [org.apache.catalina.loader.StandardClassLoader@50d89c] whereas object of type log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by [WebappClassLoader delegate: false repositories: /WEB-INF/classes/ ----------> Parent Classloader: org.apache.catalina.loader.StandardClassLoader@50d89c ]. log4j:ERROR Could not instantiate appender named "stdout". This is my log4j.properties. ### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### direct messages to file hibernate.log ### #log4j.appender.file=org.apache.log4j.FileAppender #log4j.appender.file.File=hibernate.log #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### set log levels - for more verbose logging change 'info' to 'debug' ### log4j.rootLogger=warn, stdout #log4j.logger.org.hibernate=info log4j.logger.org.hibernate=debug ### log HQL query parser activity log4j.logger.org.hibernate.hql.ast.AST=debug ### log just the SQL log4j.logger.org.hibernate.SQL=debug ### log JDBC bind parameters ### log4j.logger.org.hibernate.type=debug ### log schema export/update ### log4j.logger.org.hibernate.tool.hbm2ddl=debug log4j.logger.com.university=info log4j.logger.com.university.dao=debug ### log HQL parse trees log4j.logger.org.hibernate.hql=debug ### log cache activity ### log4j.logger.org.hibernate.cache=debug ### log transaction activity log4j.logger.org.hibernate.transaction=debug ### log JDBC resource acquisition log4j.logger.org.hibernate.jdbc=debug ### enable the following line if you want to track down connection ### ### leakages when using DriverManagerConnectionProvider ### log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace #debug Hibernate DAO com.university.dao=debug Martijn Verburg