@Override
  public java.lang.String toString() {
    java.lang.StringBuilder sb = new java.lang.StringBuilder("LogEntry(");
    boolean first = true;

    sb.append("category:");
    if (this.category == null) {
      sb.append("null");
    } else {
      sb.append(this.category);
    }
    first = false;
    if (!first) sb.append(", ");
    sb.append("message:");
    if (this.message == null) {
      sb.append("null");
    } else {
      sb.append(this.message);
    }
    first = false;
    sb.append(")");
    return sb.toString();
  }
Returns true if field corresponding to fieldID is set (has been assigned a value) and false otherwise
zipkin-collector/scribe/src/main/java/zipkin2/collector/scribe/generated/LogEntry.java