frog:~/workspaces/test/New107 $ cat -n T.java
     1 import java.util.*;
     2
     3 class T {
     4 static {
     5 Collections.EmptySet t = null;
     6 }
     7 }
frog:~/workspaces/test/New107 $ newjavac T.java
+ exec /usr/java1.5/bin/javac -J-esa -source 1.5 -target 1.4 T.java
T.java:5: cannot access java.util.Collections.EmptySet
bad class file: /usr/java1.5/jre/lib/rt.jar/java/util/Collections$EmptySet.class
undeclared type variable: E
Please remove or make sure it appears in the correct subdirectory of the classpath.
        Collections.EmptySet t = null;
                   ^
1 error
frog:~/workspaces/test/New107 $