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Java CAPTCHA

Secure your Java backend with a CAPTCHA solution built for enterprise JVM applications. Our JVM CAPTCHA SDK integrates seamlessly with Java, Kotlin, Groovy, Scala, and other JVM languages. The SDK validates CAPTCHA responses server-side with clean, reliable Java code. Safeguard user registration, authentication endpoints, and form submissions in your Java applications without compromising accessibility and user experience.
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Why Choose Friendly Captcha for Java?

Privacy-First, Invisible Java CAPTCHA

Don't make your users click on cars. Switch to a modern, invisible Java CAPTCHA.

User-Friendly

Friendly Captcha does not require any tasks from your users. It runs automatically in the background.

Fully Accessible

Don’t lock out your real users. Friendly Captcha is fully accessible and officially certified as WCAG 2.2 AA compliant gold standard.

Privacy-First

Friendly Captcha protects your users’ privacy and is compliant with GDPR, CCPA, LGPD, and more.

Easy to Integrate

Ready to integrate Friendly Captcha into your Java application. The JVM SDK is compatible with Java 8+ and supports all JVM frameworks.

Protect Your Java App Against Threats

Bot protection for Java. Trusted by developers worldwide.

You built your Java application for enterprise reliability, ecosystem maturity, and long-term maintainability – not to fight bot attacks. Yet you’re implementing custom rate limiting, managing IP blocklists, and patching authentication flows against credential stuffing and automated abuse.

Eliminate custom bot detection code and honeypots. The Friendly Captcha JVM SDK verifies CAPTCHA responses in three lines: instantiate client, call verify, evaluate result. Zero complexity. Minimal maintenance. Enterprise-grade bot protection that integrates across your entire JVM stack.

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How the Java CAPTCHA Integration Works

1.

Create a Friendly Captcha account

Create your Friendly Captcha account for free to get started with Java CAPTCHA integration. Pick a plan that fits your needs and enjoy a 30-day free trial.

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2.

Log in and create an application

Create an application in the Friendly Captcha dashboard to get a sitekey for your Java integration, as shown in the screenshot below.

Create an application to get a sitekey for your CAPTCHA integration.
3.

Create an API key for your application

Create an API key in the Friendly Captcha dashboard, as shown in the screenshot below.

Please make sure to copy and save the API key as you can only access it once.

Create an API key to interact with the CAPTCHA API.
4.

Install the Friendly Captcha JVM SDK for Java

Install the Java CAPTCHA SDK and integrate Friendly Captcha into your Java applications.

Get the JVM SDK
5.

Connect Friendly Captcha with Java

To finish the integration, share with your developer the sitekey generated in step 2 and the API key generated in step 3.

Your Java application is protected with Friendly Captcha.

Completed: 2s (2480K/s)
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FAQ

A Java CAPTCHA is a bot protection service integrated into Java applications that verifies that user interactions come from genuine individuals rather than automated bots. It secures forms and data entry in your Java applications by filtering out illegitimate requests and spam, contributing to a more secure application environment. Modern CAPTCHA solutions like Friendly Captcha operate invisibly while delivering robust protection. In contrast, traditional CAPTCHAs can either collect excessive amounts of personal information (such as Google’s invisible reCAPTCHA) or frustrate users with image recognition challenges (such as Google’s reCAPTCHA).

Friendly Captcha for Java works by presenting cryptographic puzzles in the background to the user’s device. This invisible proof-of-work approach works without disrupting the user experience, ensuring that verification is seamless and non-intrusive. As a result, it remains fully accessible and WCAG compliant.

Friendly Captcha is the best Java CAPTCHA solution available. As a European vendor, Friendly Captcha surpasses traditional Google reCAPTCHA by providing exceptional privacy compliance, robust data protection, and superior accessibility, and usability. Learn more about the benefits of Friendly Captcha and how it can secure your Java applications here.

Yes, you should use a CAPTCHA for your Java projects. As a security measure, a Java CAPTCHA protects your application by filtering out automated bot attacks and spam, especially when handling login forms, registrations, payment processes, or sensitive data. Modern solutions like Friendly Captcha offer a non-intrusive, invisible verification process that runs in the background, ensuring strong protection without disrupting the user experience.

With a Java CAPTCHA, you can safeguard your Java applications against bots and automated spam attacks. Modern CAPTCHA providers employ invisible tests that remain unobtrusive to users. Friendly Captcha leads the way in user-friendly CAPTCHA protection, ensuring strong security without sacrificing user experience. It also complies with international privacy regulations such as CCPA or GDPR and does not store any user data.

Yes, with modern CAPTCHA solutions like Friendly Captcha, a Java CAPTCHA is accessible to all users. By managing the verification process in the background, it avoids complex visual or audio challenges, ensuring that users with disabilities can interact with your Java application without unnecessary hurdles.

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Start your integration

Adding Friendly Captcha takes only minutes and just a few lines of code.

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