code: public static final Boolean coerceToBoolean(final ELContext ctx, final Object obj) {
      	// previous el 2.2 implementation returned false if obj is null
      	// so pass in true for primitive to force the same  behavior
      	return coerceToBoolean(ctx, obj, true);
      }
docs: Convert an object to Boolean.
  Null and empty string are false.
  @param ctx the context in which this conversion is taking place
  @param obj the object to convert
  @return the Boolean value of the object
  @throws ELException if object is not Boolean or String