diff --git a/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/CollectionTypeBuilder.java b/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/CollectionTypeBuilder.java
index 24b1c868a1b..efdf239b209 100755
--- a/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/CollectionTypeBuilder.java
+++ b/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/CollectionTypeBuilder.java
@@ -22,6 +22,7 @@
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 import java.text.MessageFormat;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Map;
 
@@ -48,7 +49,7 @@ public TypeDefinition build(Type type, Class<?> clazz, Map<Class<?>, TypeDefinit
         Type[] actualTypeArgs = parameterizedType.getActualTypeArguments();
         if (actualTypeArgs == null || actualTypeArgs.length != 1) {
             throw new IllegalArgumentException(MessageFormat.format(
-                    "[ServiceDefinitionBuilder] Collection type [{0}] with unexpected amount of arguments [{1}]." + actualTypeArgs,
+                    "[ServiceDefinitionBuilder] Collection type [{0}] with unexpected amount of arguments [{1}]." + Arrays.toString(actualTypeArgs),
                     new Object[]{type, actualTypeArgs}));
         }
 
diff --git a/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java b/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
index bf2b22209cd..771e421928a 100755
--- a/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
+++ b/dubbo-metadata-report/dubbo-metadata-definition/src/main/java/org/apache/dubbo/metadata/definition/builder/MapTypeBuilder.java
@@ -22,6 +22,7 @@
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
 import java.text.MessageFormat;
+import java.util.Arrays;
 import java.util.Map;
 
 /**
@@ -47,7 +48,7 @@ public TypeDefinition build(Type type, Class<?> clazz, Map<Class<?>, TypeDefinit
         Type[] actualTypeArgs = parameterizedType.getActualTypeArguments();
         if (actualTypeArgs == null || actualTypeArgs.length != 2) {
             throw new IllegalArgumentException(MessageFormat.format(
-                    "[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}]." + actualTypeArgs, new Object[]{
+                    "[ServiceDefinitionBuilder] Map type [{0}] with unexpected amount of arguments [{1}]." + Arrays.toString(actualTypeArgs), new Object[]{
                             type, actualTypeArgs}));
         }