Скачать или смотреть Solving the No Top Level Window Available Error in Java Driver with Marathon

Discover how to troubleshoot the `No Top Level Window Available` issue with Java Driver in Marathon for your JNLP applications, ensuring successful automation testing.
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This video is based on the question https://stackoverflow.com/q/62452174/ asked by the user 'Gonzalo Sintas' ( https://stackoverflow.com/u/13769492/ ) and on the answer https://stackoverflow.com/a/62474118/ provided by the user 'Aditya Karra' ( https://stackoverflow.com/u/9481454/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Addressing the No Top Level Window Available Error in Java Driver on JNLP Applications

As the automation of Java applications becomes increasingly prevalent in software testing, challenges may arise, particularly when dealing with Java Web Start (JNLP) applications. One issue that testers commonly encounter is the JavaAgentException: No top level window available error when using the Java Driver with Marathon. This post will delve into the problem and provide a structured solution, making it easier for you to navigate through similar challenges in your automation journey.

Understanding the Problem

When working with JNLP applications, the successful launch and interaction with GUI elements is crucial. This particular error often arises under the following circumstances:

A Java JNLP application is launched, but the Java Driver fails to find the main application window, leading to an inability to interact with GUI components.

The Java Driver is unable to identify the top-level window, despite the application appearing to run correctly.

For context, the No top level window available error specifically indicates that the Java Driver is unable to recognize the active window containing the application interface, which is essential to continue with the automation process.

The Root of the Issue

Key Considerations

Two main factors contribute to this error:

Java Versions: There seems to be no issue with the versions used (JDK vs. JRE), as both were reported to work correctly with MarathonITE.

Multiple Windows: The application might be generating multiple windows before the primary window that we want to interact with. Consequently, the Java Driver loses track of the top-level window it needs to operate on.

Solutions to the Problem

To successfully address the No top level window available error, follow these steps:

1. Verify Your Java Environment

Ensure that the correct Java version is being used. In this case, it was confirmed that both JDK 1.8.0_144 and JRE configurations were operational with MarathonITE. Hence, it is not the source of the issue.

2. Implement Window Switching

The critical step in solving this problem is to make the Java Driver aware of the correct window it should interact with. To do this, implement the following code line before trying to find elements:

[[See Video to Reveal this Text or Code Snippet]]

By using the switchTo().window("Window Title") method, you guide the Java Driver to the intended window, thus preventing it from throwing the No top level window available exception.

3. Continue with Element Interaction

Once the focus is correctly set on the window, you can proceed to find the specific elements within that window normally:

[[See Video to Reveal this Text or Code Snippet]]

Additional Tips

Using Unique Window Titles: Ensure that the title you pass to the switchTo().window() method is unique to avoid ambiguity with other open windows.

Testing Effectively: If you notice that windows appear sequentially, you might want to add wait conditions or retries to allow enough time for the desired window to become active before switching.

Conclusion

The No Top Level Window Available issue can be frustrating to encounter, but with the right understanding and strategic approach, it can be resolved effectively. Remember to switch to the correct window before attempting to interact with any elements within your JNLP application. By implementing these tactics, you will enhance your automation testing capabilities and ensure smooth operation with Marathon and Java Driver.

If you continue to struggle with similar issues, consider reaching out for community assistance or consulting the official