== Mustang project user documentation

Jochen Stärk

For Mustangproject 2.17.0, 2025-05-28

http://www.mustangproject.org/[http://www.mustangproject.org]

== About Mustangproject

Mustangproject is a Java-Library for invoice („Factur-X/ZUGFeRD“-)metadata in
PDF-invoices as well as XRechnung (CII, or on the reading side also UBL).

It can read, write and validate those files uses PDF/A files as
input, underlies the Apache Public License and can
be used for free in commercial and noncommercial projects as long as
the license conditions are met.

On link:https://zugferd.org/[zugferd.org] we list other libraries also for other
languages

== Download/Project setup

=== Source code

Home of the Mustangproject source code is
https://github.com/ZUGFeRD/mustangproject/

=== With Maven

E.g. using link:https://www.jetbrains.com/idea/download/?section=windows[IntelliJ].

Add the following dependency to your project


----
<dependencies>
    <dependency>
        <groupId>org.mustangproject</groupId>
        <artifactId>validator</artifactId>
        <classifier>shaded</classifier>
        <version>2.17.0</version>
    </dependency>
</dependencies>
----

Open the Maven Window and click Sync all Maven projects.

== Reading Factur-X/ZUGFeRD data

[arabic]
. Download a factur-x sample with metadata like
https://www.mustangproject.org/files/MustangGnuaccountingBeispielRE-20201121_508.pdf[https://www.mustangproject.org/files/MustangGnuaccountingBeispielRE-20201121_508.pdf]
. Create a new Maven project. Add the jar in the pom.xml as described above. In
----
public class Main {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
----

use

----
        ZUGFeRDInvoiceImporter zii=new ZUGFeRDInvoiceImporter("MustangGnuaccountingBeispielRE-20201121_508.pdf");
        CalculatedInvoice ci=new CalculatedInvoice();
        try {
            zii.extractInto(ci);
            System.out.println("Pay: "+ci.getDuePayable());
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
----

To find out how much you have to pay.

=== Complete sample source code for reading ZUGFeRD data


----
package de.usegroup;

import org.mustangproject.CalculatedInvoice;
import org.mustangproject.ZUGFeRD.ZUGFeRDInvoiceImporter;

import javax.xml.xpath.XPathExpressionException;
import java.text.ParseException;

public class Main {
    public static void main(String[] args) {
        ZUGFeRDInvoiceImporter zii=new ZUGFeRDInvoiceImporter("MustangGnuaccountingBeispielRE-20201121_508.pdf");
        CalculatedInvoice ci=new CalculatedInvoice();
        try {
            zii.extractInto(ci);
            System.out.println("Pay: "+ci.getDuePayable());
        } catch (XPathExpressionException e) {
            throw new RuntimeException(e);
        } catch (ParseException e) {
            throw new RuntimeException(e);
        }
    }
}
----

NOTE: You can additionally validate the file with two additional lines
----
        ZUGFeRDValidator zv=new ZUGFeRDValidator();
        System.out.println(zv.validate("MustangGnuaccountingBeispielRE-20201121_508.pdf"));
----


== Writing a ZUGFeRD-PDF file

A sample for writing Factur-X/ZUGFeRD PDFs requires a PDF/A file to attach the XML to,
saved
e.g. as link:https://www.mustangproject.org/files/MustangGnuaccountingBeispielRE-20190610_507blanko.pdf[blanko.pdf]

The core is creating an exporter, an invoice and send the invoice through the exporter:
----
            IZUGFeRDExporter ze = new ZUGFeRDExporterFromPDFA().load(sourcePDF).setProducer("My Application").
                    setCreator(System.getProperty("user.name"));

            Invoice i=new Invoice().setDueDate(new Date()).setIssueDate(new Date()).setDeliveryDate(new Date())
                    .setSender(new TradeParty("ACME co", "teststr", "55232", "teststadt", "DE")
                            .addBankDetails(new BankDetails("777666555", "DE4321"))).setOwnTaxID("4711").setOwnVATID("DE19990815")
                    .setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE")
                            .setContact(new Contact("nameRep", "phoneRep", "emailRep@test.com"))).setNumber("X12")
                    .addItem(new Item(new Product("Testproduct", "", "H87", new BigDecimal(19)),
                            new BigDecimal(2.5), new BigDecimal(1.0)));
            ze.setTransaction(i);
            ze.export("factur-x.pdf");
----
Additionally, you should confirm that Mustangs calculated total matches that of your PDF/A file, for which you can use
the TransactionCalculator (which is also used internally in the exporter):

----
            TransactionCalculator tc=new TransactionCalculator(i);
            System.out.println("Confirm "+tc.getDuePayable()+ " is also the final amount in your PDF");
----

NOTE: We're using BigDecimals to avoid rounding errors.

So the complete write example looks like this:
----
package de.usegroup;

import org.mustangproject.*;
import org.mustangproject.ZUGFeRD.IZUGFeRDExporter;
import org.mustangproject.ZUGFeRD.TransactionCalculator;
import org.mustangproject.ZUGFeRD.ZUGFeRDExporterFromPDFA;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.Date;

public class Main {
    public static void main(String[] args) {

        String sourcePDF="MustangGnuaccountingBeispielRE-20201121_508.pdf";
        try {
            IZUGFeRDExporter ze = new ZUGFeRDExporterFromPDFA().load(sourcePDF).setProducer("My Application").
                    setCreator(System.getProperty("user.name"));

            Invoice i=new Invoice().setDueDate(new Date()).setIssueDate(new Date()).setDeliveryDate(new Date())
                    .setSender(new TradeParty("ACME co", "teststr", "55232", "teststadt", "DE")
                            .addBankDetails(new BankDetails("777666555", "DE4321"))).setOwnTaxID("4711").setOwnVATID("DE19990815")
                    .setRecipient(new TradeParty("Franz Müller", "teststr.12", "55232", "Entenhausen", "DE")
                            .setContact(new Contact("nameRep", "phoneRep", "emailRep@test.com"))).setNumber("X12")
                    .addItem(new Item(new Product("Testproduct", "", "H87", new BigDecimal(19)),
                            new BigDecimal(2.5), new BigDecimal(1.0)));
            ze.setTransaction(i);
            ze.export("factur-x.pdf");
            TransactionCalculator tc=new TransactionCalculator(i);
            System.out.println("Confirm "+tc.getDuePayable()+ " is also the final amount in your PDF");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
----