[bug-63046] Use Log4j 2 for logging

This removes the POILogger and POILogFactory mechanism for logging. This mechanism was created at a time when the Java landscape looked very different than it does today.

Log4j 2 is an Apache Foundation project that is well maintained and is widely regarded as having good performance and capabilities. We use only the Log4j API artifact. This lets application developers choose how they want to capture logging events if at all. Integrations with Log4j 2 Core and Logback are available from the Log4j project.

Closes #224

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1886770 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 4 insertions, 4 deletions

diff --git a/src/examples/src/org/apache/poi/examples/hssf/usermodel/Outlines.java b/src/examples/src/org/apache/poi/examples/hssf/usermodel/Outlines.java
index b5121448c4..42f1b16fc3 100644
--- a/src/examples/src/org/apache/poi/examples/hssf/usermodel/Outlines.java
+++ b/src/examples/src/org/apache/poi/examples/hssf/usermodel/Outlines.java
@@ -22,12 +22,12 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
-import org.apache.poi.util.POILogFactory;
-import org.apache.poi.util.POILogger;
 
 /**
  * Creates outlines.
@@ -35,13 +35,13 @@ import org.apache.poi.util.POILogger;
 public class Outlines implements Closeable {
     public static void main(String[] args)
     throws IOException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {
-        POILogger LOGGER = POILogFactory.getLogger(Outlines.class);
+        Logger LOGGER = LogManager.getLogger(Outlines.class);
         for (int i=1; i<=13; i++) {
             try (Outlines o = new Outlines()) {
                 String log = (String) Outlines.class.getDeclaredMethod("test" + i).invoke(o);
                 String filename = "outline" + i + ".xls";
                 o.writeOut(filename);
-                LOGGER.log(POILogger.INFO, filename, " written. ", log);
+                LOGGER.atInfo().log("{} written. {}", filename, log);
             }
         }
     }