Overriding the Java toString method using For loop

This solution uses a combination of reflection, constants and regular expressions to build a meaningful toString output:

private String TO_STRING_FIELDS = "email isPKI isTrustedRoot isITU_TX509 caName"

    @Override public String toString() {
        try {
            StringBuilder result = new StringBuilder();
            //String newLine = System.getProperty("line.separator");
            String[] fieldList = TO_STRING_FIELDS.split( "[\\s,]+");
            Field curField = null;
            for (String f : fieldList) {
                curField = this.getClass().getDeclaredField(f);
                result.append("  " + f);
                result.append(": ");
                //requires access to private field:
                result.append( curField.get(this) );
            }
        } catch (Exception e) {
            System.out.println("Error in toString for class: " + this.getClass().getName() + "\n" + e.getMessage());
        }

        return null;
    }