Send PDF Files to Telegram Groups in Java - Complete Guide

Automate Telegram Group Document Sharing with Java

Need to integrate Telegram group PDF sharing into your Java applications for enterprise reporting, automated documentation, or team collaboration? This guide shows you how to deliver PDF files to Telegram groups using Java and the WhatsMate Telegram Gateway REST API. Perfect for Java developers building enterprise applications, backend services, or automation tools that need document delivery to group chats.

📋 Prerequisites

Before you begin, ensure you have:

1. A WhatsMate Telegram Gateway account - Required for API access
2. Group membership - The gateway must be a member of the target Telegram group
3. Java Development Kit (JDK) 8 or later - Installed and configured on your system
4. PDF file ready - Have the document you want to send available locally
5. Required dependencies - Gson and Commons Codec libraries (instructions included)

⚠️ Important: The gateway must be a member of the Telegram group you want to send messages to. The group admin phone number is used to uniquely identify the group.

📄 Document Support: While focused on PDF files, this approach works with various document types supported by Telegram’s document sharing feature.

🎥 Video Walkthrough

📝 Step-by-Step Implementation

Follow these steps to send your first PDF document to a Telegram group from a Java application:

1. Copy the Java Source Code

Start by copying the following source code into your Java file:

2. Configure a few Parameters

Customize these key parameters in the Java code:

• Line 51: Replace "YOUR_INSTANCE_ID_HERE" with your Telegram gateway instance ID
• Line 52: Replace "YOUR_CLIENT_ID_HERE" with your Client ID
• Line 53: Replace "YOUR_CLIENT_SECRET_HERE" with your Client Secret
• Line 61: Replace "Muscle Men Club" with the name of your target Telegram group
• Line 62: Replace "19159876123" with the phone number of the group admin (including country code)
• Line 64: Replace "../assets/subwaymap.pdf" with the path to your PDF file
• Line 66: Replace "anyname.pdf" with the desired filename for the document
• Line 67: Replace "Check this out" with an optional caption for your PDF

3. Set Up Dependencies

Add the required libraries to your project:

For Maven projects, add to your pom.xml:

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.0</version>
</dependency>
<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.10</version>
</dependency>

4. Compile and Run

Compile and execute your Java program:

If using Maven (after adding dependencies to pom.xml):

mvn compile
mvn exec:java -Dexec.mainClass="TelegramGroupPdfSender"

If not using Maven:

# Compile with required JAR files
javac -cp "jars/gson-2.8.0.jar:jars/commons-codec-1.10.jar" TelegramGroupPdfSender.java

# Run the compiled program
java -cp ".:jars/gson-2.8.0.jar:jars/commons-codec-1.10.jar" TelegramGroupPdfSender

🔧 Common Use Cases

This Java integration is ideal for:

• Enterprise application integration - Add Telegram group PDF sharing to Java-based business systems
• Automated reporting systems - Generate and deliver reports, invoices, or statements as PDFs to Telegram groups
• Backend service notifications - Send documents from Java microservices to team groups for collaboration
• Batch processing workflows - Automate document delivery as part of larger Java data processing pipelines
• Legacy system modernization - Add modern document sharing capabilities to existing Java applications

🚀 Get Started Today

Ready to integrate Telegram group PDF sharing into your Java applications? You’ll need a trial account to access the API. Sign up for a 2-week trial and start sending PDF documents to groups from your Java code within minutes!

Next Steps: Once you’ve mastered group PDF sending, explore advanced features like sending images to groups, audio files to groups, or individual messages through the WhatsMate Telegram Gateway API documentation.