sketch out ResourceBundle

classpath/java/lang/Character.java

@@ -70,7 +70,7 @@ public final class Character {
   }
 
   public static boolean isWhitespace(char c) {
-    return c == ' ' || c == '\t' || c == '\n';
+    return c == ' ' || c == '\t' || c == '\n' || c == '\r';
   }
 
   public static boolean isSpaceChar(char c) {

classpath/java/lang/Throwable.java

@@ -31,6 +31,14 @@ public class Throwable {
     return cause;
   }
 
+  public void initCause(Throwable e) {
+    if (cause == null) {
+      cause = e;
+    } else {
+      throw new IllegalStateException();
+    }
+  }
+
   public String getMessage() {
     return message;
   }