Question 1

How do I generate a PDF from a webpage using Jvppeteer?

Accepted Answer

Use the Page.pdf() method with options like paper format and scaling. The README provides a code example that requires setting headless mode, adding launch arguments like --no-sandbox, and configuring PDF options such as path and outline.

Question 2

Jvppeteer vs Selenium for Java browser automation: which is better?

Accepted Answer

Jvppeteer offers a Puppeteer-like high-level API with modern protocol support (DevTools/WebDriver-bidi), while Selenium uses WebDriver for broader browser compatibility. Choose Jvppeteer for Puppeteer familiarity in Java, but Selenium if you need established cross-browser testing with a larger ecosystem.

Question 3

Can Jvppeteer run Firefox in headless mode?

Accepted Answer

Yes, Jvppeteer supports headless mode for Firefox via WebDriver-bidi, but with limited functionality compared to Chrome. The README notes that unsupported features will throw exceptions, so check the protocol support list.

Question 4

How to configure logging in Jvppeteer?

Accepted Answer

Jvppeteer uses SLF4J for logging without a default implementation, so you must add a logging backend like Logback or Log4j. Set the log level to Debug for troubleshooting, as mentioned in the Logging section.

Question 5

What browsers does Jvppeteer support, and are there version requirements?

Accepted Answer

It supports Chrome via DevTools and Firefox via WebDriver-bidi, but each Jvppeteer version is tied to specific browser versions listed in a mapping table. You need to download compatible browsers, such as Chrome for Testing, to avoid issues.

Question 6

How to automate taking screenshots with Jvppeteer?

Accepted Answer

Use the Page.screenshot() method with options like path, image type (PNG, JPEG, WEBP), and full-page settings. The README includes examples for capturing screenshots with quality adjustments and viewport configurations.

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