--- a/dev/core/src/com/google/gwt/dev/javac/JdtCompiler.java
+++ b/dev/core/src/com/google/gwt/dev/javac/JdtCompiler.java
@@ -220,6 +220,10 @@
     public String toString() {
       return builder.toString();
     }
+
+    public boolean ignoreOptionalProblems() {
+      return false;
+    }
   }
 
   private class CompilerImpl extends Compiler {
--- a/dev/core/src/com/google/gwt/dev/jdt/AbstractCompiler.java
+++ b/dev/core/src/com/google/gwt/dev/jdt/AbstractCompiler.java
@@ -122,6 +122,10 @@
     public String toString() {
       return unit.toString();
     }
+
+    public boolean ignoreOptionalProblems() {
+      return false;
+    }
   }
 
   /**
