Remove log4j and log4j2 support.

Projects can make and configure their own shim, but Java logging is a better
default and log4j has been deprecated six ways to Sunday.

pom.xml

@@ -44,20 +44,6 @@
       <version>6.0.0</version>
       <scope>provided</scope>
     </dependency>
-    <dependency>
-      <groupId>log4j</groupId>
-      <artifactId>log4j</artifactId>
-      <version>1.2.16</version>
-      <scope>compile</scope>
-      <optional>true</optional>
-    </dependency>
-    <dependency>
-      <groupId>org.apache.logging.log4j</groupId>
-      <artifactId>log4j-api</artifactId>
-      <version>2.0-rc2</version>
-      <scope>compile</scope>
-      <optional>true</optional>
-    </dependency>
     <dependency>
       <groupId>javax.mail</groupId>
       <artifactId>mail</artifactId>

src/main/java/com/samskivert/util/Log4J2Logger.java

@@ -1,56 +0,0 @@
-//
-// samskivert library - useful routines for java programs
-// Copyright (C) 2001-2012 Michael Bayne, et al.
-// http://github.com/samskivert/samskivert/blob/master/COPYING
-
-package com.samskivert.util;
-
-import org.apache.logging.log4j.Level;
-import org.apache.logging.log4j.LogManager;
-
-/**
- * A factory for creating log4j2 logger implementations.
- */
-public class Log4J2Logger implements Logger.Factory
-{
-    // from interface Logger.Factory
-    public void init ()
-    {
-    }
-
-    // from interface Logger.Factory
-    public Logger getLogger (String name)
-    {
-        return new Impl(LogManager.getLogger(name));
-    }
-
-    // from interface Logger.Factory
-    public Logger getLogger (Class<?> clazz)
-    {
-        return new Impl(LogManager.getLogger(clazz));
-    }
-
-    protected static class Impl extends Logger
-    {
-        public Impl (org.apache.logging.log4j.Logger impl)
-        {
-            _impl = impl;
-        }
-
-        @Override // from Logger
-        protected boolean shouldLog (int levIdx)
-        {
-            return _impl.isEnabled(LEVELS[levIdx]);
-        }
-
-        @Override // from Logger
-        protected void doLog (int levIdx, String formatted, Throwable throwable)
-        {
-            _impl.log(LEVELS[levIdx], formatted, throwable);
-        }
-
-        protected final org.apache.logging.log4j.Logger _impl;
-        protected static final Level[] LEVELS = {
-            Level.DEBUG, Level.INFO, Level.WARN, Level.ERROR };
-    }
-}

src/main/java/com/samskivert/util/Log4JLogger.java

@@ -1,56 +0,0 @@
-//
-// samskivert library - useful routines for java programs
-// Copyright (C) 2001-2012 Michael Bayne, et al.
-// http://github.com/samskivert/samskivert/blob/master/COPYING
-
-package com.samskivert.util;
-
-import org.apache.log4j.Level;
-
-/**
- * A factory for creating log4j logger implementations.
- */
-public class Log4JLogger implements Logger.Factory
-{
-    // from interface Logger.Factory
-    public void init ()
-    {
-    }
-
-    // from interface Logger.Factory
-    public Logger getLogger (String name)
-    {
-        return new Impl(org.apache.log4j.Logger.getLogger(name));
-    }
-
-    // from interface Logger.Factory
-    public Logger getLogger (Class<?> clazz)
-    {
-        return getLogger(clazz.getName());
-    }
-
-    protected static class Impl extends Logger
-    {
-        public Impl (org.apache.log4j.Logger impl)
-        {
-            _impl = impl;
-        }
-
-        @Override // from Logger
-        protected boolean shouldLog (int levIdx)
-        {
-            return _impl.isEnabledFor(LEVELS[levIdx]);
-        }
-
-        @Override // from Logger
-        protected void doLog (int levIdx, String formatted, Throwable throwable)
-        {
-            _impl.log(_self, LEVELS[levIdx], formatted, throwable);
-        }
-
-        protected final org.apache.log4j.Logger _impl;
-        protected final String _self = getClass().getName();
-        protected static final Level[] LEVELS = {
-            Level.DEBUG, Level.INFO, Level.WARN, Level.ERROR };
-    }
-}

src/main/java/com/samskivert/util/Logger.java

@@ -10,9 +10,9 @@ package com.samskivert.util;
  * that they can be used in a larger project and easily be made to log to the logging framework in
  * use by that project.
  *
- * <p> The default implementation uses log4j if it is available and falls back to the Java logging
+ * <p> The default implementation uses the Java logging services. A specific (or custom) logging
- * services if not. A specific (or custom) logging implementation can be configured like so:
+ * implementation can be configured like so:
- * <pre>-Dcom.samskivert.util.Logger=com.samskivert.util.Log4Logger</pre>
+ * <pre>-Dcom.samskivert.util.Logger=com.your.custom.Log4Logger</pre>
  *
  * <p> One additional enhancement is the use of varargs log methods to allow for some handy
  * automatic formatting. The methods take a log message and list of zero or more additional
@@ -166,36 +166,10 @@ public abstract class Logger
     {
         // if a custom class was specified as a system property, use that
         Factory factory = createConfiguredFactory();
-
+        // otherwise, use the Java logging system
-        // create and a log4j logger if the log4j configuration system property is set
-        try {
-            if (factory == null && System.getProperty("log4j.configuration") != null) {
-                factory = (Factory)Class.forName("com.samskivert.util.Log4JLogger").
-                    getDeclaredConstructor().newInstance();
-            }
-        } catch (SecurityException se) {
-            // in a sandbox, no biggie
-        } catch (Throwable t) {
-            System.err.println("Unable to instantiate Log4JLogger: " + t);
-        }
-
-        // create and a log4j2 logger if the log4j2 configuration system property is set
-        try {
-            if (factory == null && System.getProperty("log4j.configurationFile") != null) {
-                factory = (Factory)Class.forName("com.samskivert.util.Log4J2Logger").
-                    getDeclaredConstructor().newInstance();
-            }
-        } catch (SecurityException se) {
-            // in a sandbox, no biggie
-        } catch (Throwable t) {
-            System.err.println("Unable to instantiate Log4J2Logger: " + t);
-        }
-
-        // lastly, fall back to the Java logging system
         if (factory == null) {
             factory = new JDK14Logger();
         }
-
         // and finally configure our factory
         setFactory(factory);
     }