diff --git a/utils/junit/src/main/java/org/onlab/junit/ImmutableClassChecker.java b/utils/junit/src/main/java/org/onlab/junit/ImmutableClassChecker.java
index 421a3e9..f2dbb3f 100644
--- a/utils/junit/src/main/java/org/onlab/junit/ImmutableClassChecker.java
+++ b/utils/junit/src/main/java/org/onlab/junit/ImmutableClassChecker.java
@@ -52,7 +52,9 @@
 
         // class must have only final and private data members
         for (final Field field : clazz.getDeclaredFields()) {
-            if (field.getName().startsWith("__cobertura")) {
+            if (field.getName().startsWith("_") ||
+                field.getName().startsWith("$")) {
+                //  eclipse generated code may insert switch table - ignore
                 //  cobertura sticks these fields into classes - ignore them
                 continue;
             }