This closes #3512

artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/TypedProperties.java

@@ -23,10 +23,12 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Objects;
 import java.util.Set;
 import java.util.function.BiConsumer;
 import java.util.function.Consumer;
 import java.util.function.Predicate;
+import java.util.function.Supplier;
 
 import io.netty.buffer.ByteBuf;
 import org.apache.activemq.artemis.api.core.ActiveMQPropertyConversionException;
@@ -169,10 +171,12 @@ public class TypedProperties {
       throw new ActiveMQPropertyConversionException("Invalid conversion: " + key);
    }
 
-   public Byte getByteProperty(final SimpleString key) throws ActiveMQPropertyConversionException {
+   public Byte getByteProperty(final SimpleString key,
+                               final Supplier<Byte> defaultValue) throws ActiveMQPropertyConversionException {
+      Objects.requireNonNull(defaultValue);
       Object value = doGetProperty(key);
       if (value == null) {
-         return Byte.valueOf(null);
+         return defaultValue.get();
       } else if (value instanceof Byte) {
          return (Byte) value;
       } else if (value instanceof SimpleString) {
@@ -181,6 +185,10 @@ public class TypedProperties {
       throw new ActiveMQPropertyConversionException("Invalid conversion: " + key);
    }
 
+   public Byte getByteProperty(final SimpleString key) throws ActiveMQPropertyConversionException {
+      return getByteProperty(key, () -> Byte.valueOf(null));
+   }
+
    public Character getCharProperty(final SimpleString key) throws ActiveMQPropertyConversionException {
       Object value = doGetProperty(key);
       if (value == null) {

artemis-commons/src/test/java/org/apache/activemq/artemis/utils/TypedPropertiesConversionTest.java

@@ -115,6 +115,18 @@ public class TypedPropertiesConversionTest {
       }
    }
 
+   @Test
+   public void testNoByteProperty() {
+      Assert.assertEquals(0, props.size());
+      Assert.assertNull(props.getByteProperty(key, () -> null));
+      props.putByteProperty(key.concat('0'), RandomUtil.randomByte());
+      Assert.assertEquals(1, props.size());
+      Assert.assertNull(props.getByteProperty(key, () -> null));
+      props.putNullValue(key);
+      Assert.assertTrue(props.containsProperty(key));
+      Assert.assertNull(props.getByteProperty(key, () -> null));
+   }
+
    @Test
    public void testIntProperty() throws Exception {
       Integer val = RandomUtil.randomInt();

artemis-core-client/src/main/java/org/apache/activemq/artemis/core/message/impl/CoreMessage.java

@@ -154,10 +154,11 @@ public class CoreMessage extends RefCountMessage implements ICoreMessage {
 
    @Override
    public RoutingType getRoutingType() {
-      if (containsProperty(Message.HDR_ROUTING_TYPE)) {
-         return RoutingType.getType(getByteProperty(Message.HDR_ROUTING_TYPE));
+      final Byte maybeByte = getProperties().getByteProperty(Message.HDR_ROUTING_TYPE, () -> null);
+      if (maybeByte == null) {
+         return null;
       }
-      return null;
+      return RoutingType.getType(maybeByte);
    }
 
    @Override