From e94fd427f308f33a9fe30a2d3ebebcf083d14bf2 Mon Sep 17 00:00:00 2001
From: Brett Leslie Porter <brett@apache.org>
Date: Thu, 5 May 2005 00:35:55 +0000
Subject: [PATCH] improve error message if there is no expression

git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@168220 13f79535-47bb-0310-9956-ffa450edef68
---
 .../java/org/apache/maven/plugin/DefaultPluginManager.java   | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginManager.java b/maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginManager.java
index 4b9ff87242..93371babb5 100644
--- a/maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginManager.java
+++ b/maven-core/src/main/java/org/apache/maven/plugin/DefaultPluginManager.java
@@ -718,7 +718,10 @@ public static String createPluginParameterRequiredMessage( MojoDescriptor mojo,
         message.append( "' parameter is required for the execution of the " );
         message.append( mojo.getFullGoalName() );
         message.append( " mojo and cannot be null." );
-        message.append( " The retrieval expression was: " ).append( expression );
+        if ( expression != null )
+        {
+            message.append( " The retrieval expression was: " ).append( expression );
+        }
 
         return message.toString();
     }