fixed errors reported by Checkstyle

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-2/branches/maven-2.2.x@813534 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven-error-diagnostics/src/main/java/org/apache/maven/usability/diagnostics/ErrorDiagnoser.java b/maven-error-diagnostics/src/main/java/org/apache/maven/usability/diagnostics/ErrorDiagnoser.java
index c1f3629..bf46000 100644
--- a/maven-error-diagnostics/src/main/java/org/apache/maven/usability/diagnostics/ErrorDiagnoser.java
+++ b/maven-error-diagnostics/src/main/java/org/apache/maven/usability/diagnostics/ErrorDiagnoser.java
@@ -21,7 +21,7 @@
 
 public interface ErrorDiagnoser
 {
-    static final String ROLE = ErrorDiagnoser.class.getName();
+    String ROLE = ErrorDiagnoser.class.getName();
 
     boolean canDiagnose( Throwable error );