diff --git a/modules/addons/transports/http/undertow/src/test/java/org/jboss/wsf/stack/cxf/addons/transports/undertow/UndertowServerEngineTest.java b/modules/addons/transports/http/undertow/src/test/java/org/jboss/wsf/stack/cxf/addons/transports/undertow/UndertowServerEngineTest.java
index 30553ce3e..a47fec9c9 100644
--- a/modules/addons/transports/http/undertow/src/test/java/org/jboss/wsf/stack/cxf/addons/transports/undertow/UndertowServerEngineTest.java
+++ b/modules/addons/transports/http/undertow/src/test/java/org/jboss/wsf/stack/cxf/addons/transports/undertow/UndertowServerEngineTest.java
@@ -29,6 +29,7 @@
 import java.io.OutputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -156,7 +157,7 @@ private void pingServer(URL url)
       {
          HttpURLConnection connection1 = (HttpURLConnection) url.openConnection();
          StringBuilder sb = new StringBuilder();
-         BufferedReader br = new BufferedReader(new InputStreamReader(connection1.getInputStream()));
+         BufferedReader br = new BufferedReader(new InputStreamReader(connection1.getInputStream(), StandardCharsets.UTF_8));
          String line;
          while ((line = br.readLine()) != null) {
             sb.append(line);
@@ -186,7 +187,7 @@ public void handleRequest(HttpServerExchange exchange) throws Exception
          count.incrementAndGet();
          exchange.setResponseCode(200);
          OutputStream os = exchange.getOutputStream();
-         os.write("Hello".getBytes());
+         os.write("Hello".getBytes(StandardCharsets.UTF_8));
          os.flush();
          
       }
diff --git a/modules/test-utils/src/main/java/org/jboss/wsf/test/AppclientHelper.java b/modules/test-utils/src/main/java/org/jboss/wsf/test/AppclientHelper.java
index 1da7f737d..b6b37ab9b 100644
--- a/modules/test-utils/src/main/java/org/jboss/wsf/test/AppclientHelper.java
+++ b/modules/test-utils/src/main/java/org/jboss/wsf/test/AppclientHelper.java
@@ -27,7 +27,9 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.io.PrintWriter;
+import java.nio.charset.StandardCharsets;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;
@@ -190,7 +192,7 @@ private static AppclientProcess newAppclientProcess(final String archive, final
    }
 
    private static void printLogTrailer(OutputStream logOutputStreams, String appclientFullName) {
-      final PrintWriter pw = new PrintWriter(logOutputStreams);
+      final PrintWriter pw = new PrintWriter(new OutputStreamWriter(logOutputStreams, StandardCharsets.UTF_8));
       pw.write("Starting appclient process: " + appclientFullName + "...\n");
       pw.flush();
    }
diff --git a/modules/test-utils/src/main/java/org/jboss/wsf/test/XOPTestSupport.java b/modules/test-utils/src/main/java/org/jboss/wsf/test/XOPTestSupport.java
index 089d75537..2359996d0 100644
--- a/modules/test-utils/src/main/java/org/jboss/wsf/test/XOPTestSupport.java
+++ b/modules/test-utils/src/main/java/org/jboss/wsf/test/XOPTestSupport.java
@@ -30,6 +30,7 @@
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 
 import javax.activation.DataHandler;
 import javax.xml.transform.stream.StreamSource;
@@ -77,7 +78,7 @@ public static Image createTestImage(File imgFile)
 
    public static StreamSource createTestSource()
    {
-      return new StreamSource(new ByteArrayInputStream("<some><nestedXml/></some>".getBytes()));
+      return new StreamSource(new ByteArrayInputStream("<some><nestedXml/></some>".getBytes(StandardCharsets.UTF_8)));
    }
 
    public static DataHandler createDataHandler(File imgFile)