[MJAR-217] Make finalName readonly parameter


git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1739997 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java b/src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java
index 712a73d..120b825 100644
--- a/src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java
+++ b/src/main/java/org/apache/maven/plugins/jar/AbstractJarMojo.java
@@ -72,7 +72,7 @@
      * Starting with <b>3.0.0</b> the property has been renamed from <code>jar.finalName</code> to
      * <code>maven.jar.finalName</code>.
      */
-    @Parameter( defaultValue = "${project.build.finalName}" )
+    @Parameter( defaultValue = "${project.build.finalName}", readonly = true )
     private String finalName;
 
     /**