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Version: Version 1.6

Get started with Java

This guide walks you through the steps to use a code example, and then explains how to integrate the Pdftools SDK into your application with the Java programming language.

Prerequisites​

The Pdftools SDK for Java requires Java version 8 or higher.

Getting started with a sample project​

Learn how to use the Pdftools SDK using a Java code example. The Pdf2ImgSimple example converts a PDF file to an image. Use similar steps to run any other code example from the sdk-examples-java repository.

Compile and run the sample​

  1. Clone the sdk-examples-java repository:

    git clone https://github.com/pdf-tools/sdk-examples-java.git

  2. From the cloned repository, import the .project file into the Eclipse IDE. The source file PdfToolsPdf2ImgSimple.java is compiled automatically.

  3. Right-click the java file, and then select PdfToolsPdf2ImgSimple.java > Run As > Run configurations….

  4. Create a new configuration for a Java Application, and then add the required arguments, for example:

    PdfPrimerWhitepaper.pdf OutputPdfPrimerWhitePaper.tiff

The sample runs without a license key, and the output carries a watermark. To remove the watermark, open the main Java file (for example, PdfToolsPdf2ImgSimple.java) and uncomment the Sdk.initialize method call in main(). Replace the "insert-license-key-here" placeholder with your license key. Include the less-than (<) and greater-than (>) signs.

note

You can apply a similar procedure as described in this tutorial for other code examples. For more information, see Code samples page.

Integrate the SDK into your application​

Integrate and initialize the Pdftools SDK into your application by following the instructions in the next sections.

Add the SDK to your project​

The Pdftools SDK for Java is available on Maven. To add the Pdftools SDK for Java to your project, select your operating system and system architecture and add the following to your pom.xml:

<dependency>
    <groupId>com.pdftools</groupId>
    <artifactId>pdftools-sdk</artifactId>
    <version>1.6.1</version>
</dependency>
<dependency>
    <groupId>com.pdftools</groupId>
    <artifactId>pdftools-sdk</artifactId>
    <version>1.6.1</version>
    <classifier>linux-x64</classifier>
    <type>so</type>
</dependency>

Load the SDK​

The Pdftools SDK for Java requires you to load the underlying native binary files suitable for your operating system and system architecture at runtime.

There are two ways how to load the Pdftools SDK for Java with Maven:

  1. If you are consuming Java libraries directly from the local Maven repository, load the native binary files using the following code:

    System.load(System.getProperty("user.home") + "/.m2/repository/com/pdftools/pdftools-sdk/1.6.1/pdftools-sdk-1.6.1-linux-x64.so");

  2. Alternatively, use the system library path:

    1. Add the Pdftools SDK lib directory to the system library path.

      • Windows: Environment variable PATH
      • Linux and macOS: Defined by LD_LIBRARY_PATH
      • Or specify the path using the VM arg -Djava.library.path=.

    2. Load the library using:

      System.loadLibrary("pdftools-sdk-1.6.1-linux-x64");
note

Note the difference between:

  • System.load(..): Loads the library from an absolute file path.
  • System.loadLibrary(..): Load the library from the system’s library path.
info

If you are shipping your application, ensure to ship it with the native binary files. Note that you must load the native binary files from the file system and cannot load them from within a jar file or other bundle.

Optional: Initialize the SDK​

The Pdftools SDK runs without an explicit Sdk.initialize call by auto-activating an internal test license that watermarks the output. Call Sdk.initialize with your license key to remove the watermark.

Getting a license key

Contact the Pdftools sales team through the Contact page to get a full license.

Call Sdk.initialize once at application startup, before any other Pdftools SDK method call:

Sdk.initialize("YOUR_LICENSE_KEY");

Use the license key in the same format you copied it. Include the less-than (<) and greater-than (>) signs.

For a working reference, see the Sdk.initialize method in the Pdf2ImgSimple Java sample. In SDK samples the call is commented out by default with an "insert-license-key-here" placeholder; uncomment it and replace the placeholder with your license key.

Implement your use case​

  • Find more use cases and code examples on the Code samples page.
  • For more technical information about the Pdftools SDK for Java, consult the Java technical notes.