diff --git a/tools/warn/java_warn_patterns.py b/tools/warn/java_warn_patterns.py
index 534f48d..7dfa866 100644
--- a/tools/warn/java_warn_patterns.py
+++ b/tools/warn/java_warn_patterns.py
@@ -74,6 +74,8 @@
                 [r'.*\.class\): warning: Cannot find annotation method .+ in']),
     java_medium('No class/method in SDK ...',
                 [r'.*\.java:.*: warning: No such (class|method) .* for SDK']),
+    java_medium('Unknown enum constant',
+                [r'unknown_source_file: warning: unknown enum constant .+']),
     # Warnings generated by Error Prone
     java_medium('Non-ascii characters used, but ascii encoding specified',
                 [r".*: warning: unmappable character for encoding ascii"]),
@@ -207,6 +209,8 @@
            'Logging or rethrowing exceptions should usually be preferred to catching and calling printStackTrace'),
     medium('CatchFail',
            'Ignoring exceptions and calling fail() is unnecessary, and makes test output less useful'),
+    medium('ChangedAbstract',
+           'Method has changed \'abstract\' qualifier'),
     medium('ClassCanBeStatic',
            'Inner class is non-static but does not reference enclosing class'),
     medium('ClassNewInstance',
@@ -355,6 +359,8 @@
            'equals method doesn\'t override Object.equals'),
     medium('NotCloseable',
            'Not closeable'),
+    medium('NullableCollection',
+           'Method should not return a nullable collection'),
     medium('NullableConstructor',
            'Constructors should not be annotated with @Nullable since they cannot return null'),
     medium('NullableDereference',