[MNG-6931] Deprecate custom logging approach

This closes #385

maven-plugin-api/src/main/java/org/apache/maven/monitor/logging/DefaultLog.java

@@ -24,7 +24,10 @@ import org.codehaus.plexus.logging.Logger;
 
 /**
  * @author jdcasey
+ *
+ * @deprecated Use SLF4J directly
  */
+@Deprecated
 public class DefaultLog
     implements Log
 {
@@ -128,4 +131,4 @@ public class DefaultLog
         return logger.isErrorEnabled();
     }
 
-}
+}

maven-plugin-api/src/main/java/org/apache/maven/plugin/AbstractMojo.java

@@ -128,9 +128,9 @@ import org.apache.maven.plugin.logging.SystemStreamLog;
  *      </td>
  *   </tr>
  * </table>
- * <p>This is only a small set of all the options. A complete list can be found at 
+ * <p>This is only a small set of all the options. A complete list can be found at
  * <a href="https://maven.apache.org/components/plugin-tools/maven-plugin-tools-annotations/index.html" target="_blank">
- * Maven Plugin Tool for Annotations</a>. 
+ * Maven Plugin Tool for Annotations</a>.
  *
  * @see <a href="https://maven.apache.org/guides/plugin/guide-java-plugin-development.html" target="_blank">Guide to Developing Java Plugins</a>
  * @see <a href="https://maven.apache.org/guides/mini/guide-configuring-plugins.html" target="_blank">Guide to Configuring Plug-ins</a>
@@ -149,6 +149,10 @@ public abstract class AbstractMojo
     /** Plugin container context */
     private Map pluginContext;
 
+    /**
+     * @deprecated Use SLF4J directly
+     */
+    @Deprecated
     @Override
     public void setLog( Log log )
     {
@@ -167,7 +171,9 @@ public abstract class AbstractMojo
      * method directly whenever you need the logger, it is fast enough and needs no caching.
      *
      * @see org.apache.maven.plugin.Mojo#getLog()
+     * @deprecated Use SLF4J directly
      */
+    @Deprecated
     @Override
     public Log getLog()
     {

maven-plugin-api/src/main/java/org/apache/maven/plugin/Mojo.java

@@ -54,16 +54,19 @@ public interface Mojo
      * and feedback to the user.
      *
      * @param log a new logger
+     *
+     * @deprecated Use SLF4J directly
      */
-    // TODO not sure about this here, and may want a getLog on here as well/instead
+    @Deprecated
     void setLog( Log log );
 
     /**
      * Furnish access to the standard Maven logging mechanism which is managed in this base class.
      *
      * @return a log4j-like logger object which allows plugins to create messages at levels of <code>"debug"</code>,
-     * <code>"info"</code>, <code>"warn"</code>, and <code>"error"</code>. This logger is the accepted means to display
+     * <code>"info"</code>, <code>"warn"</code>, and <code>"error"</code>.
-     * information to the user.
+     * @deprecated Use SLF4J directly
      */
+    @Deprecated
     Log getLog();
 }

maven-plugin-api/src/main/java/org/apache/maven/plugin/logging/Log.java

@@ -28,7 +28,10 @@ package org.apache.maven.plugin.logging;
  * rather than formatting first by calling <code>toString()</code>.
  *
  * @author jdcasey
+ *
+ * @deprecated Use SLF4J directly
  */
+@Deprecated
 public interface Log
 {
     /**
@@ -146,4 +149,4 @@ public interface Log
      * @param error
      */
     void error( Throwable error );
-}
+}

maven-plugin-api/src/main/java/org/apache/maven/plugin/logging/SystemStreamLog.java

@@ -26,7 +26,10 @@ import java.io.StringWriter;
  * Logger with "standard" output and error output stream.
  *
  * @author jdcasey
+ *
+ * @deprecated Use SLF4J directly
  */
+@Deprecated
 public class SystemStreamLog
     implements Log
 {
@@ -193,4 +196,4 @@ public class SystemStreamLog
 
         System.out.println( "[" + prefix + "] " + content.toString() + "\n\n" + sWriter.toString() );
     }
-}
+}