make the Log4j 1.2 Bridge work

src/main/org/apache/tools/ant/listener/Log4jListener.java

@@ -15,11 +15,9 @@
  *  limitations under the License.
  *
  */
-
 package org.apache.tools.ant.listener;
 
 import org.apache.log4j.Logger;
-import org.apache.log4j.helpers.NullEnumeration;
 import org.apache.tools.ant.BuildEvent;
 import org.apache.tools.ant.BuildListener;
 import org.apache.tools.ant.Project;
@@ -41,20 +39,13 @@ public class Log4jListener implements BuildListener {
      */
     public static final String LOG_ANT = "org.apache.tools.ant";
 
-    /** Indicates if the listener was initialized. */
-    private final boolean initialized;
-
-    /**
-     * Construct the listener and make sure there is a valid appender.
-     */
-    public Log4jListener() {
-        final Logger log = Logger.getLogger(LOG_ANT);
-        final Logger rootLog = Logger.getRootLogger();
-        initialized = !(rootLog.getAllAppenders() instanceof NullEnumeration);
-        if (!initialized) {
-            log.error("No log4j.properties in build area");
-        }
-    }
+     /**
+     * Construct the listener
+      */
+     public Log4jListener() {
+        // trigger the log4j initialization (if at all it's not yet initialized)
+         final Logger log = Logger.getLogger(LOG_ANT);
+     }
 
     /**
      * @see BuildListener#buildStarted
@@ -62,10 +53,8 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void buildStarted(final BuildEvent event) {
-        if (initialized) {
-            final Logger log = Logger.getLogger(Project.class.getName());
-            log.info("Build started.");
-        }
+        final Logger log = Logger.getLogger(Project.class.getName());
+        log.info("Build started.");
     }
 
     /**
@@ -74,13 +63,11 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void buildFinished(final BuildEvent event) {
-        if (initialized) {
-            final Logger log = Logger.getLogger(Project.class.getName());
-            if (event.getException() == null) {
-                log.info("Build finished.");
-            } else {
-                log.error("Build finished with error.", event.getException());
-            }
+        final Logger log = Logger.getLogger(Project.class.getName());
+        if (event.getException() == null) {
+            log.info("Build finished.");
+        } else {
+            log.error("Build finished with error.", event.getException());
         }
     }
 
@@ -90,10 +77,8 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void targetStarted(final BuildEvent event) {
-        if (initialized) {
-            final Logger log = Logger.getLogger(Target.class.getName());
-            log.info("Target \"" + event.getTarget().getName() + "\" started.");
-        }
+        final Logger log = Logger.getLogger(Target.class.getName());
+        log.info("Target \"" + event.getTarget().getName() + "\" started.");
     }
 
     /**
@@ -102,15 +87,13 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void targetFinished(final BuildEvent event) {
-        if (initialized) {
-            final String targetName = event.getTarget().getName();
-            final Logger cat = Logger.getLogger(Target.class.getName());
-            if (event.getException() == null) {
-                cat.info("Target \"" + targetName + "\" finished.");
-            } else {
-                cat.error("Target \"" + targetName
-                    + "\" finished with error.", event.getException());
-            }
+        final String targetName = event.getTarget().getName();
+        final Logger cat = Logger.getLogger(Target.class.getName());
+        if (event.getException() == null) {
+            cat.info("Target \"" + targetName + "\" finished.");
+        } else {
+            cat.error("Target \"" + targetName
+                + "\" finished with error.", event.getException());
         }
     }
 
@@ -120,11 +103,9 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void taskStarted(final BuildEvent event) {
-        if (initialized) {
-            final Task task = event.getTask();
-            final Logger log = Logger.getLogger(task.getClass().getName());
-            log.info("Task \"" + task.getTaskName() + "\" started.");
-        }
+        final Task task = event.getTask();
+        final Logger log = Logger.getLogger(task.getClass().getName());
+        log.info("Task \"" + task.getTaskName() + "\" started.");
     }
 
     /**
@@ -133,15 +114,13 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void taskFinished(final BuildEvent event) {
-        if (initialized) {
-            final Task task = event.getTask();
-            final Logger log = Logger.getLogger(task.getClass().getName());
-            if (event.getException() == null) {
-                log.info("Task \"" + task.getTaskName() + "\" finished.");
-            } else {
-                log.error("Task \"" + task.getTaskName()
-                    + "\" finished with error.", event.getException());
-            }
+        final Task task = event.getTask();
+        final Logger log = Logger.getLogger(task.getClass().getName());
+        if (event.getException() == null) {
+            log.info("Task \"" + task.getTaskName() + "\" finished.");
+        } else {
+            log.error("Task \"" + task.getTaskName()
+                + "\" finished with error.", event.getException());
         }
     }
 
@@ -151,37 +130,35 @@ public class Log4jListener implements BuildListener {
      */
     @Override
     public void messageLogged(final BuildEvent event) {
-        if (initialized) {
-            Object categoryObject = event.getTask();
+        Object categoryObject = event.getTask();
+        if (categoryObject == null) {
+            categoryObject = event.getTarget();
             if (categoryObject == null) {
-                categoryObject = event.getTarget();
-                if (categoryObject == null) {
-                    categoryObject = event.getProject();
-                }
+                categoryObject = event.getProject();
             }
+        }
 
-            final Logger log
-                = Logger.getLogger(categoryObject.getClass().getName());
-            switch (event.getPriority()) {
-                case Project.MSG_ERR:
-                    log.error(event.getMessage());
-                    break;
-                case Project.MSG_WARN:
-                    log.warn(event.getMessage());
-                    break;
-                case Project.MSG_INFO:
-                    log.info(event.getMessage());
-                    break;
-                case Project.MSG_VERBOSE:
-                    log.debug(event.getMessage());
-                    break;
-                case Project.MSG_DEBUG:
-                    log.debug(event.getMessage());
-                    break;
-                default:
-                    log.error(event.getMessage());
-                    break;
-            }
+        final Logger log
+            = Logger.getLogger(categoryObject.getClass().getName());
+        switch (event.getPriority()) {
+            case Project.MSG_ERR:
+                log.error(event.getMessage());
+                break;
+            case Project.MSG_WARN:
+                log.warn(event.getMessage());
+                break;
+            case Project.MSG_INFO:
+                log.info(event.getMessage());
+                break;
+            case Project.MSG_VERBOSE:
+                log.debug(event.getMessage());
+                break;
+            case Project.MSG_DEBUG:
+                log.debug(event.getMessage());
+                break;
+            default:
+                log.error(event.getMessage());
+                break;
         }
     }
 }