The methods can't be called from Java directly...

gistfile1.txt

% scalac weird.scala && javap X
Compiled from "weird.scala"
public class X implements scala.ScalaObject {
  public int 1();
  public java.lang.String package();
  public java.lang.String class();
  public java.lang.String def();
  public java.lang.String for();
  public java.lang.String while();
  public X();
}

weird.scala

class X {
	def `1` = 2
	def `package` = "hello"
	def `class` = "weird"
	def `def` = "world"
	def `for` = "!"
	def `while` = "elhiw"
}