diff --git a/src/main/java/org/codehaus/gmavenplus/util/ReflectionUtils.java b/src/main/java/org/codehaus/gmavenplus/util/ReflectionUtils.java
index 8998e56e..915cc26b 100644
--- a/src/main/java/org/codehaus/gmavenplus/util/ReflectionUtils.java
+++ b/src/main/java/org/codehaus/gmavenplus/util/ReflectionUtils.java
@@ -48,7 +48,7 @@ public static Constructor<?> findConstructor(final Class<?> clazz, final Class<?
             }
             searchType = searchType.getSuperclass();
         }
-        throw new IllegalArgumentException("Unable to find constructor " + clazz.getName() + "(" + Arrays.toString(paramTypes).replaceAll("^\\[", "").replaceAll("]$", "").replaceAll("class ", "") + ").");
+        throw new IllegalArgumentException("Unable to find constructor " + clazz.getName() + "(" + formatParameterTypes(paramTypes) + ").");
     }
 
     /**
@@ -107,7 +107,7 @@ public static Method findMethod(final Class<?> clazz, final String name, final C
             }
             searchType = searchType.getSuperclass();
         }
-        throw new IllegalArgumentException("Unable to find method " + clazz.getName() + "." + name + "(" + Arrays.toString(paramTypes).replaceAll("^\\[", "").replaceAll("]$", "").replaceAll("class ", "") + ").");
+        throw new IllegalArgumentException("Unable to find method " + clazz.getName() + "." + name + "(" + formatParameterTypes(paramTypes) + ").");
     }
 
     /**
@@ -245,6 +245,30 @@ private static Method[] getDeclaredMethods(Class<?> clazz) {
         return result;
     }
 
+    private static String formatParameterTypes(final Class<?>[] paramTypes) {
+        if (paramTypes == null) {
+            return "null";
+        }
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < paramTypes.length; i++) {
+            if (paramTypes[i] == null) {
+                sb.append("null");
+            } else {
+                String s = paramTypes[i].toString();
+                final String classPrefix = "class ";
+                if (s.startsWith(classPrefix)) {
+                    sb.append(s.substring(classPrefix.length()));
+                } else {
+                    sb.append(s);
+                }
+            }
+            if (i < paramTypes.length - 1) {
+                sb.append(", ");
+            }
+        }
+        return sb.toString();
+    }
+
     private static List<Method> findConcreteMethodsOnInterfaces(Class<?> clazz) {
         List<Method> result = null;
         for (Class<?> ifc : clazz.getInterfaces()) {