[jacorb-developer] Help: Use of slf4j in jacorb

[ZION Stephane (SAFRAN ELECTRONICS & DEFENSE)]

Hi everyone,

I try to use Jacorb 3.9 (as I used 2.3 before).
When launching my application, I got one exception when loading the web.xml :

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.JDK14LoggerFactory]
sept. 04, 2020 5:39:09 AM org.apache.catalina.core.StandardContext
listenerStart
GRAVE: Exception lors de l'envoi de l'évènement contexte initialisé (context initialized) à l'instance de classe d'écoute (listener) com.server.PrintLogStatusListener

java.lang.ClassCastException: org.slf4j.impl.JDK14LoggerFactory cannot be cast to ch.qos.logback.classic.LoggerContext
at   com.server.PrintLogStatusListener.contextInitialized(PrintLogStatusListener.java:25)
at   org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5127)
at   org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5643)
at   org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at   org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at   org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at   org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at   org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1260)
at   org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2002)
at   java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at   java.util.concurrent.FutureTask.run(FutureTask.java:266)
at   java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at   java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at   java.lang.Thread.run(Thread.java:748)


PrintLogStatusListener is defined like this in the web.xml:
<listener>
    <listener-class>com.server.PrintLogStatusListener</listener-class>
  </listener>



My PrintLogStatusListener class looks like this:

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.util.StatusPrinter;
import org.slf4j.LoggerFactory;

public class PrintLogStatusListener implements ServletContextListener,
                                               HttpSessionListener, HttpSessionAttributeListener {

                                                 // -------------------------------------------------------
          // ServletContextListener implementation
          // -------------------------------------------------------
          public void contextInitialized( ServletContextEvent sce ) {
            LoggerContext lc = ( LoggerContext ) LoggerFactory.getILoggerFactory();
            StatusPrinter.print( lc );
          }
  }

  I think the pb deals with a conflict between slf4j and logback. The 3.9 jacorb version seems to impose the use of slf4j (via loads slf4j-api-1.7.14.jar).
  I Use JAVA_ENDORSED_DIRS=/opt/Jacorb/3.9.1/lib

  How could I solve my pb? Thanks for your help ;)

  Stéphane


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