diff --git a/core/src/main/java/com/opensymphony/xwork2/mock/MockObjectTypeDeterminer.java b/core/src/main/java/com/opensymphony/xwork2/mock/MockObjectTypeDeterminer.java
index 40e633aae8..4c8eef88d2 100644
--- a/core/src/main/java/com/opensymphony/xwork2/mock/MockObjectTypeDeterminer.java
+++ b/core/src/main/java/com/opensymphony/xwork2/mock/MockObjectTypeDeterminer.java
@@ -21,6 +21,8 @@
 import com.opensymphony.xwork2.conversion.ObjectTypeDeterminer;
 import ognl.OgnlException;
 import ognl.OgnlRuntime;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import java.util.Map;
 
@@ -31,6 +33,8 @@
  */
 public class MockObjectTypeDeterminer implements ObjectTypeDeterminer {
 
+    private static final Logger LOG = LogManager.getLogger(MockObjectTypeDeterminer.class);
+
     private Class keyClass;
     private Class elementClass;
     private String keyProperty;
@@ -69,10 +73,9 @@ public String getKeyProperty(Class parentClass, String property) {
     public boolean shouldCreateIfNew(Class parentClass, String property,
                                      Object target, String keyProperty, boolean isIndexAccessed) {
         try {
-            System.out.println("ognl:"+OgnlRuntime.getPropertyAccessor(Map.class)+" this:"+this);
+            LOG.info("Ognl: {} this: {}", OgnlRuntime.getPropertyAccessor(Map.class), this);
         } catch (OgnlException e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
+            LOG.error("Call to shouldCreateIfNew has failed!", e);
         }
         return isShouldCreateIfNew();
     }
diff --git a/core/src/main/java/com/opensymphony/xwork2/util/ClassPathFinder.java b/core/src/main/java/com/opensymphony/xwork2/util/ClassPathFinder.java
index 7a23791105..1b97bf517c 100644
--- a/core/src/main/java/com/opensymphony/xwork2/util/ClassPathFinder.java
+++ b/core/src/main/java/com/opensymphony/xwork2/util/ClassPathFinder.java
@@ -18,6 +18,8 @@
  */
 package com.opensymphony.xwork2.util;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 import org.apache.struts2.StrutsException;
 
 import java.io.File;
@@ -41,6 +43,8 @@
  */
 public class ClassPathFinder {
 
+    private static final Logger LOG = LogManager.getLogger(ClassPathFinder.class);
+
     /**
      * The String pattern to test against.
      */
@@ -106,7 +110,7 @@ public Vector<String> findMatches() {
                         }
                     }
                 } catch (IOException e) {
-                    e.printStackTrace();
+                    LOG.warn("Error reading zip file: {}", entry, e);
                 }
             } else {
                 Vector<String> results = checkEntries(entry.list(), entry, "");
diff --git a/core/src/main/java/com/opensymphony/xwork2/util/PropertiesReader.java b/core/src/main/java/com/opensymphony/xwork2/util/PropertiesReader.java
index 62319f0f2c..bc1ef413f9 100644
--- a/core/src/main/java/com/opensymphony/xwork2/util/PropertiesReader.java
+++ b/core/src/main/java/com/opensymphony/xwork2/util/PropertiesReader.java
@@ -18,6 +18,9 @@
  */
 package com.opensymphony.xwork2.util;
 
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
 import java.io.IOException;
 import java.io.LineNumberReader;
 import java.io.Reader;
@@ -40,6 +43,9 @@
  * </p>
  */
 public class PropertiesReader extends LineNumberReader {
+
+    private static final Logger LOG = LogManager.getLogger(PropertiesReader.class);
+
     /**
      * Stores the comment lines for the currently processed property.
      */
@@ -451,7 +457,7 @@ public static String unescapeJava(String str) {
             return writer.toString();
         } catch (IOException ioe) {
             // this should never ever happen while writing to a StringWriter
-            ioe.printStackTrace();
+            LOG.warn("Call to unescape java string failed!", ioe);
             return null;
         }
     }
diff --git a/core/src/main/java/org/apache/struts2/interceptor/debugging/DebuggingInterceptor.java b/core/src/main/java/org/apache/struts2/interceptor/debugging/DebuggingInterceptor.java
index bf8fabe69d..f51eb18230 100644
--- a/core/src/main/java/org/apache/struts2/interceptor/debugging/DebuggingInterceptor.java
+++ b/core/src/main/java/org/apache/struts2/interceptor/debugging/DebuggingInterceptor.java
@@ -203,7 +203,7 @@ public String intercept(ActionInvocation inv) throws Exception {
                          ServletActionContext.getResponse().getWriter()) {
                     writer.print(stack.findValue(cmd));
                 } catch (IOException ex) {
-                    ex.printStackTrace();
+                    LOG.warn("Interceptor in: {} mode has failed!", COMMAND_MODE, ex);
                 }
                 cont = false;
             } else if (BROWSER_MODE.equals(type)) {
@@ -286,7 +286,7 @@ protected void printContext() {
             printContext(writer);
             writer.close();
         } catch (IOException ex) {
-            ex.printStackTrace();
+            LOG.warn("Call to PrettyPrintWriter failed!", ex);
         }
     }