Syntax error: insert "enum Identifier", insert "EnumBody", inset "}"

I have coded an enum type that throws the following syntax errors when running my generated JUnit test:

java.lang.Error: Unresolved compilation problems: 
    Syntax error, insert "enum Identifier" to complete EnumHeaderName
    Syntax error, insert "EnumBody" to complete EnumDeclaration
    Syntax error, insert "}" to complete ClassBody

      

        
        
        
      

    

My enum type has static functions that return an enum constant for a particular string. Here are some of my enum type code:

public enum MusicType {

    ACCIDENTAL, LETTER, OCTAVE, REST, DUR, CHORD, TUPLET;

    public static MusicType is_accidental(String a){
        if (a=="^" | a=="_"|a=="=")
            return ACCIDENTAL;
        else return null;
    }

}

      

        
        
        
      

    

The rest of my static functions are very similar (i.e. is_letter

, is_octave

etc.), although some use a function input.matches(regex)

instead of checking to see if an input matches a particular string.

Here is the start of a JUnit test that tests the function associated with a random constant:

public class MusicTypeTest {

    @Test
    public void accidentalTest(){
        String sharp = "^";
        String flat = "_";
        String natural = "=";
        assertEquals(MusicType.ACCIDENTAL, MusicType.is_accidental(sharp));
        assertEquals(MusicType.ACCIDENTAL, MusicType.is_accidental(flat));
        assertEquals(MusicType.ACCIDENTAL, MusicType.is_accidental(natural));
    }

}

      

        
        
        
      

    

The other functions in my JUnit test that test all static enum functions are coded in a similar way. I can't figure out why I have these syntax errors (this is my first time coding for an enum type). I have been coding in Eclipse and have not found any missing "yet."