Annoying SLF4J problem in Weblogic server 12c http://blog.terrencemiao.com/archives/annoying-slf4j-problem-in-weblogic-server-12c
prefer-application-packages
Used for filtering ClassLoader configuration. Specifies a list of packages for classes that must always be loaded from the application.http://docs.oracle.com/cd/E24329_01/web.1211/e21049/weblogic_xml.htm#autoId24
Weblogic log without prefer-application-packages and after redeploy with the option set in weblogic.xml
Aug 3, 2012 11:20:03 PM dave.TestSlf4jLogger doGet
INFO: Hello World- info
Aug 3, 2012 11:20:04 PM dave.TestSlf4jLogger doGet
INFO: Hello World- info
Aug 3, 2012 11:20:05 PM dave.TestSlf4jLogger doGet
INFO: Hello World- info
Aug 3, 2012 11:20:05 PM dave.TestSlf4jLogger doGet
INFO: Hello World- info
Aug 3, 2012 11:20:05 PM dave.TestSlf4jLogger doGet
INFO: Hello World- info
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/app/weblogic121/modules/org.slf4j.jdk14_1.6.1.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [zip:/home/dave/workspace38/testSLF4JWAR/WebContent/WEB-INF/lib/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j: Parsing for [root] with value=[DEBUG, file, stdout].
log4j: Level token is [DEBUG].
log4j: Category root set to DEBUG
log4j: Parsing appender named "file".
log4j: Parsing layout options for "file".
log4j: Setting property [conversionPattern] to [%d{ABSOLUTE} %5p %c{1}:%L - %m%n].
log4j: End of parsing for "file".
log4j: Setting property [file] to [/tmp/testSLF4j.log].
log4j: Setting property [maxBackupIndex] to [1].
log4j: Setting property [maxFileSize] to [1MB].
log4j: setFile called: /tmp/testSLF4j.log, true
log4j: setFile ended
log4j: Parsed "file" options.
log4j: Parsing appender named "stdout".
log4j: Parsing layout options for "stdout".
log4j: Setting property [conversionPattern] to [%d{ABSOLUTE} %5p %c{1}:%L - %m%n].
log4j: End of parsing for "stdout".
log4j: Setting property [target] to [System.out].
log4j: Parsed "stdout" options.
log4j: Finished configuring.
23:23:07,943 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:07,949 INFO TestSlf4jLogger:42 - Hello World- info
23:23:08,590 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:08,592 INFO TestSlf4jLogger:42 - Hello World- info
23:23:09,386 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:09,387 INFO TestSlf4jLogger:42 - Hello World- info
[dave@dave testSLF4JWAR]$ more /tmp/testSLF4j.log
23:23:07,943 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:07,949 INFO TestSlf4jLogger:42 - Hello World- info
23:23:08,590 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:08,592 INFO TestSlf4jLogger:42 - Hello World- info
23:23:09,386 DEBUG TestSlf4jLogger:41 - Hello World - debug
23:23:09,387 INFO TestSlf4jLogger:42 - Hello World- info
[dave@dave testSLF4JWAR]$ ls -1 WebContent/WEB-INF/lib/
log4j-1.2.16.jar
slf4j-api-1.6.6.jar
slf4j-log4j12-1.6.6.jar
[dave@dave testSLF4JWAR]$ find /app/weblogic121/ -name "*slf4j*"
/app/weblogic121/modules/org.slf4j.jdk14_1.6.1.0.jar
/app/weblogic121/modules/org.slf4j.ext_1.6.1.0.jar
/app/weblogic121/modules/org.slf4j.api_1.6.1.0.jar
log4j.debug=true
# Root logger option
log4j.rootLogger=DEBUG, file, stdout
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=/tmp/testSLF4j.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
# 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
<?xml version="1.0" encoding="UTF-8"?>
<wls:weblogic-web-app xmlns:wls="http://xmlns.oracle.com/weblogic/weblogic-web-app" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd http://xmlns.oracle.com/weblogic/weblogic-web-app http://xmlns.oracle.com/weblogic/weblogic-web-app/1.4/weblogic-web-app.xsd">
<wls:weblogic-version>12.1.1</wls:weblogic-version>
<wls:context-root>testSLF4JWAR</wls:context-root>
<wls:container-descriptor>
<wls:prefer-application-packages>
<wls:package-name>org.slf4j</wls:package-name>
</wls:prefer-application-packages>
</wls:container-descriptor>
</wls:weblogic-web-app>
package dave;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Servlet implementation class TestSlf4jLogger
*/
@WebServlet("/TestSlf4jLogger")
public class TestSlf4jLogger extends HttpServlet {
private static final long serialVersionUID = 1L;
final Logger logger = LoggerFactory.getLogger(TestSlf4jLogger.class);
/**
* @see HttpServlet#HttpServlet()
*/
public TestSlf4jLogger() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("Hello World");
logger.debug("Hello World - debug");
logger.info("Hello World- info");
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
LF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/app/weblogic121/modules/org.slf4j.jdk14_1.6.1.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [zip:/home/dave/workspace38/testSLF4jEAR/EarContent/APP-INF/lib/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [zip:/home/dave/workspace38/testSLF4JWAR/WebContent/WEB-INF/lib/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j: Parsing for [root] with value=[DEBUG, file, stdout].
log4j: Level token is [DEBUG].
log4j: Category root set to DEBUG
log4j: Parsing appender named "file".
log4j: Parsing layout options for "file".
log4j: Setting property [conversionPattern] to [%d{ABSOLUTE} %5p %c{1}:%L - %m%n].
log4j: End of parsing for "file".
log4j: Setting property [file] to [/tmp/testSLF4j.log].
log4j: Setting property [maxBackupIndex] to [1].
log4j: Setting property [maxFileSize] to [1MB].
log4j: setFile called: /tmp/testSLF4j.log, true
log4j: setFile ended
log4j: Parsed "file" options.
log4j: Parsing appender named "stdout".
log4j: Parsing layout options for "stdout".
log4j: Setting property [conversionPattern] to [%d{ABSOLUTE} %5p %c{1}:%L - %m%n].
log4j: End of parsing for "stdout".
log4j: Setting property [target] to [System.out].
log4j: Parsed "stdout" options.
log4j: Finished configuring.
00:07:24,873 DEBUG TestSlf4jLogger:46 - Hello World - debug
00:07:24,928 INFO TestSlf4jLogger:47 - Hello World- info
TestSLF4JService: Hello World
Aug 4, 2012 12:07:25 AM dave.TestSLF4JBean testLogger
INFO: TestSLF4JService: Hello World- info
00:14:48,273 DEBUG TestSlf4jLogger:46 - Hello World - debug
00:14:48,277 INFO TestSlf4jLogger:47 - Hello World- info
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/app/weblogic121/modules/org.slf4j.jdk14_1.6.1.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [zip:/home/dave/workspace38/testSLF4jEAR/EarContent/APP-INF/lib/slf4j-log4j12-1.6.6.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
TestSLF4JService: Hello World
00:14:48,297 DEBUG TestSLF4JBean:26 - TestSLF4JService: Hello World - debug
00:14:48,297 INFO TestSLF4JBean:27 - TestSLF4JService: Hello World- info
<?xml version="1.0" encoding="UTF-8"?>
<wls:weblogic-application xmlns:wls="http://xmlns.oracle.com/weblogic/weblogic-application" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/javaee_5.xsd http://xmlns.oracle.com/weblogic/weblogic-application http://xmlns.oracle.com/weblogic/weblogic-application/1.4/weblogic-application.xsd">
<!--weblogic-version:12.1.1-->
<wls:application-param>
<wls:param-name>webapp.encoding.default</wls:param-name>
<wls:param-value>UTF-8</wls:param-value>
</wls:application-param>
<wls:prefer-application-packages>
<wls:package-name>org.slf4j</wls:package-name>
</wls:prefer-application-packages>
</wls:weblogic-application>
dave@dave workspace38]$ ls testSLF4jEAR/EarContent/APP-INF/lib
log4j-1.2.16.jar slf4j-api-1.6.6.jar slf4j-log4j12-1.6.6.jar
[dave@dave workspace38]$ ls -1 testSLF4jEAR/EarContent/APP-INF/lib
log4j-1.2.16.jar
slf4j-api-1.6.6.jar
slf4j-log4j12-1.6.6.jar
[dave@dave workspace38]$ ls -1 testSLF4jEAR/EarContent/META-INF
weblogic-application.xml
package dave;
import javax.ejb.Stateless;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Session Bean implementation class TestSLF4JService
*/
@Stateless
public class TestSLF4JBean implements TestSLF4JService {
final Logger logger = LoggerFactory.getLogger(TestSLF4JBean.class);
/**
* Default constructor.
*/
public TestSLF4JBean() {
// TODO Auto-generated constructor stub
}
public void testLogger(){
System.out.println("TestSLF4JService: Hello World");
logger.debug("TestSLF4JService: Hello World - debug");
logger.info("TestSLF4JService: Hello World- info");
}
}
@EJB
TestSLF4JService service;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("Hello World");
logger.debug("Hello World - debug");
logger.info("Hello World- info");
service.testLogger();
}