Static Object doesn't get collected

Question

Hi,
I have a class JLog to log all the messages to a file. The JLog class is in a jx.war file which is deployed to the application server JBoss.
If the jx.war is deployed once, the messages printed to the file only show up once, which is fine.
But if the jx.war is deployed twice, the messages printed to the file show up twice.
If the jx.war is deployed three times, the messages show up three time and so forth.
My question is why the static object jLogger from the previous deployments doesn't get collected.
I think switching to Singleton implementation will solve this issue.
But are there any other ways to sovle it?
public class JLog {
     private static int logLevel = getLogLevel();
     private static long line = 0;     
     static Logger jLogger;
     private static PatternLayout jLayout = null;
     private static Appender jAppender = null;
     public static void toLogger(String msg ) {                    
          try {
               if ( jLogger == null ) {
                    // System.out.println(" *** get a new logger *** ");
                    jLogger = Logger.getLogger(JLog.class.getName() );                    
                    jLogger.setAdditivity( false );
                    jLogger.setLevel( Level.ALL );
               if ( jLayout == null ) {
                    // System.out.println(" * new patternLayout " );
                    String pattern = "%d{yyyy-MM-dd HH:mm:ss,SSS} - %m%n";                    
                    jLayout = new PatternLayout( pattern );
                    pattern = null;
               if ( jAppender == null ) {
                    // System.out.println(" * new FileAppender " );
                    String filename = "jx.log";
                    String dataPattern = "'.'yyyy-MM-dd";
                    jAppender = new DailyRollingFileAppender( jLayout, filename, dataPattern );                    
                    filename = null;
               jLogger.addAppender( jAppender );               
               jLogger.debug( msg );               
          } catch (Exception e) {
               System.out.println("Exception! JLog.toLogger >>> " + e.getMessage() );
               e.printStackTrace();
          } // try
     } // toLogger
}

Answer 1

Each application in an application server is independant.
This means singletons, and static values appear once per application. i.e. each application has its own copy.