diff --git a/common/src/main/java/io/netty/util/internal/ThrowableUtil.java b/common/src/main/java/io/netty/util/internal/ThrowableUtil.java
index 790196b9c2..dcb532ec46 100644
--- a/common/src/main/java/io/netty/util/internal/ThrowableUtil.java
+++ b/common/src/main/java/io/netty/util/internal/ThrowableUtil.java
@@ -15,6 +15,10 @@
  */
 package io.netty.util.internal;
 
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
 public final class ThrowableUtil {
 
     private ThrowableUtil() { }
@@ -26,4 +30,26 @@ public final class ThrowableUtil {
         cause.setStackTrace(new StackTraceElement[] { new StackTraceElement(clazz.getName(), method, null, -1)});
         return cause;
     }
+
+    /**
+     * Gets the stack trace from a Throwable as a String.
+     *
+     * @param cause the {@link Throwable} to be examined
+     * @return the stack trace as generated by {@link Throwable#printStackTrace(java.io.PrintWriter)} method.
+     */
+    public static String stackTraceToString(Throwable cause) {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        PrintStream pout = new PrintStream(out);
+        cause.printStackTrace(pout);
+        pout.flush();
+        try {
+            return new String(out.toByteArray());
+        } finally {
+            try {
+                out.close();
+            } catch (IOException ignore) {
+                // ignore as should never happen
+            }
+        }
+    }
 }
diff --git a/common/src/main/java/io/netty/util/internal/ThrowableUtils.java b/common/src/main/java/io/netty/util/internal/ThrowableUtils.java
deleted file mode 100644
index a592862584..0000000000
--- a/common/src/main/java/io/netty/util/internal/ThrowableUtils.java
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright 2016 The Netty Project
- *
- * The Netty Project licenses this file to you under the Apache License,
- * version 2.0 (the "License"); you may not use this file except in compliance
- * with the License. You may obtain a copy of the License at:
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- */
-package io.netty.util.internal;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.PrintStream;
-
-public final class ThrowableUtils {
-
-    /**
-     * <p>Gets the stack trace from a Throwable as a String.</p>
-     *
-     * @param throwable the <code>Throwable</code> to be examined
-     * @return the stack trace as generated by the exception's
-     *  <code>printStackTrace(PrintWriter)</code> method
-     */
-    public static String stackTraceToString(Throwable cause) {
-        ByteArrayOutputStream out = new ByteArrayOutputStream();
-        PrintStream pout = new PrintStream(out);
-        cause.printStackTrace(pout);
-        pout.flush();
-        try {
-            return new String(out.toByteArray());
-        } finally {
-            try {
-                out.close();
-            } catch (IOException ignore) {
-                // ignore as should never happen
-            }
-        }
-    }
-
-    private ThrowableUtils() { }
-}
diff --git a/transport/src/main/java/io/netty/channel/AbstractChannelHandlerContext.java b/transport/src/main/java/io/netty/channel/AbstractChannelHandlerContext.java
index 90f768800f..3db0bf4b07 100644
--- a/transport/src/main/java/io/netty/channel/AbstractChannelHandlerContext.java
+++ b/transport/src/main/java/io/netty/channel/AbstractChannelHandlerContext.java
@@ -20,7 +20,7 @@ import io.netty.util.DefaultAttributeMap;
 import io.netty.util.Recycler;
 import io.netty.util.ReferenceCountUtil;
 import io.netty.util.concurrent.EventExecutor;
-import io.netty.util.internal.ThrowableUtils;
+import io.netty.util.internal.ThrowableUtil;
 import io.netty.util.internal.ObjectUtil;
 import io.netty.util.internal.StringUtil;
 import io.netty.util.internal.SystemPropertyUtil;
@@ -276,7 +276,7 @@ abstract class AbstractChannelHandlerContext extends DefaultAttributeMap impleme
                         "An exception {}" +
                         "was thrown by a user handler's exceptionCaught() " +
                         "method while handling the following exception:",
-                        ThrowableUtils.stackTraceToString(error), cause);
+                        ThrowableUtil.stackTraceToString(error), cause);
                 } else if (logger.isWarnEnabled()) {
                     logger.warn(
                         "An exception '{}' [enable DEBUG level for full stacktrace] " +
diff --git a/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java b/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
index d2da7800df..b3e2e7a708 100644
--- a/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
+++ b/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
@@ -25,7 +25,7 @@ import io.netty.util.ReferenceCountUtil;
 import io.netty.util.concurrent.FastThreadLocal;
 import io.netty.util.internal.InternalThreadLocalMap;
 import io.netty.util.internal.PlatformDependent;
-import io.netty.util.internal.ThrowableUtils;
+import io.netty.util.internal.ThrowableUtil;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 
@@ -677,7 +677,7 @@ public final class ChannelOutboundBuffer {
             } else {
                 logger.warn(
                         "Failed to mark a promise as success because it has failed already: {}, unnotified cause {}",
-                        promise, ThrowableUtils.stackTraceToString(err));
+                        promise, ThrowableUtil.stackTraceToString(err));
             }
         }
     }
@@ -690,7 +690,7 @@ public final class ChannelOutboundBuffer {
             } else {
                 logger.warn(
                         "Failed to mark a promise as failure because it has failed already: {}, unnotified cause {}",
-                        promise, ThrowableUtils.stackTraceToString(err), cause);
+                        promise, ThrowableUtil.stackTraceToString(err), cause);
             }
         }
     }
diff --git a/transport/src/main/java/io/netty/channel/CombinedChannelDuplexHandler.java b/transport/src/main/java/io/netty/channel/CombinedChannelDuplexHandler.java
index cc10a3cd18..675d8a86d5 100644
--- a/transport/src/main/java/io/netty/channel/CombinedChannelDuplexHandler.java
+++ b/transport/src/main/java/io/netty/channel/CombinedChannelDuplexHandler.java
@@ -19,7 +19,7 @@ import io.netty.buffer.ByteBufAllocator;
 import io.netty.util.Attribute;
 import io.netty.util.AttributeKey;
 import io.netty.util.concurrent.EventExecutor;
-import io.netty.util.internal.ThrowableUtils;
+import io.netty.util.internal.ThrowableUtil;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 
@@ -148,7 +148,7 @@ public class CombinedChannelDuplexHandler<I extends ChannelInboundHandler, O ext
                                     "An exception {}" +
                                     "was thrown by a user handler's exceptionCaught() " +
                                     "method while handling the following exception:",
-                                    ThrowableUtils.stackTraceToString(error), cause);
+                                    ThrowableUtil.stackTraceToString(error), cause);
                         } else if (logger.isWarnEnabled()) {
                             logger.warn(
                                     "An exception '{}' [enable DEBUG level for full stacktrace] " +