javap fails when unicode escapes are used to create a class name in a java
source file:

With Source classmini1.java:

// no.1
public class classmini1{
    public static void main(String args[]){
        String className = "\u6f22\u5b57";
        String classToString = "class "+className;
        \u6f22\u5b57 kanjiClass = new \u6f22\u5b57();
        Class c = kanjiClass.getClass();
        kanjiClass.kanjitest();
        System.out.println("Success: " + classToString);
    }
}
//
class \u6f22\u5b57{
    public \u6f22\u5b57(){}
    public static void kanjitest(){
        System.out.println("In kanjitest");
    }
}

//

javac compiles it fine and produces "W.class from 'class \u6f22\u5b57'


dugout% javap -c -l -private -s -verbose classmini1
Error: No binary file '??'
Compiled from classmini1.java
public class classmini1 extends java.lang.Object {
    public static void main(java.lang.String[]);
        /* ([Ljava/lang/String;)V */
        /* Stack=4, Locals=4, Args_size=1 */
    public classmini1();
        /* ()V */
        /* Stack=1, Locals=1, Args_size=1 */
}

Method void main(java.lang.String[])
   0 ldc #3 <String "??">
   2 astore_1
   3 new #7 <Class java.lang.StringBuffer>
   6 dup
   7 ldc #2 <String "class ">
   9 invokespecial #12 <Method java.lang.StringBuffer(java.lang.String)>
  12 aload_1
  13 invokevirtual #13 <Method java.lang.StringBuffer append(java.lang.String)>
  16 invokevirtual #18 <Method java.lang.String toString()>
  19 astore_2
  20 new #9 <Class ??>
  23 dup
  24 invokespecial #11 <Method dugout%