make loggers static final

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1915929 13f79535-47bb-0310-9956-ffa450edef68

poi/src/main/java/org/apache/poi/poifs/filesystem/TempFilePOIFSFileSystem.java

@@ -32,7 +32,7 @@ import java.io.IOException;
  */
 @Beta
 public class TempFilePOIFSFileSystem extends POIFSFileSystem {
-    private static Logger LOG = LogManager.getLogger(TempFilePOIFSFileSystem.class);
+    private static final Logger LOG = LogManager.getLogger(TempFilePOIFSFileSystem.class);
     File tempFile;
 
     @Override

poi/src/main/java/org/apache/poi/ss/formula/WorkbookEvaluator.java

@@ -78,7 +78,7 @@ public final class WorkbookEvaluator {
     private boolean dbgEvaluationOutputForNextEval;
 
     // special logger for formula evaluation output (because of possibly very large output)
-    private final Logger EVAL_LOG = LogManager.getLogger("POI.FormulaEval");
+    private static final Logger EVAL_LOG = LogManager.getLogger("POI.FormulaEval");
     // current indent level for evaluation; negative value for no output
     private int dbgEvaluationOutputIndent = -1;