Скачать или смотреть Fixing the java.lang.RuntimeException Error When Starting Redis on Windows

Discover effective solutions to fix the `java.lang.RuntimeException: Can't start redis server` error on Windows and optimize your Spring Boot application.
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This video is based on the question https://stackoverflow.com/q/53287218/ asked by the user 'Prateek' ( https://stackoverflow.com/u/2929562/ ) and on the answer https://stackoverflow.com/a/65151707/ provided by the user 'Sameera Manorathna' ( https://stackoverflow.com/u/3007581/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Redis Issues on Windows: Resolving the java.lang.RuntimeException Error

If you are developing applications using Spring Boot and Spring Data Redis, only to encounter the error message: "java.lang.RuntimeException: Can't start redis server. Check logs for details", you're not alone. This common problem arises particularly on Windows systems, especially when multiple Redis instances are running or if the necessary permissions are not set correctly. In this guide, we will look into the root cause of this issue and provide you with straightforward solutions to effectively resolve it without needing to reboot your machine each time.

Understanding the Issue

When you try to run your application, the given error may surface due to one of the following reasons:

Existing Redis Instances: A Redis server may already be running on your machine, competing with the one you are trying to start embedded within your application.

Port Conflicts: The port assigned for the embedded Redis server could be occupied by another process.

Permissions: Limited administrative access might prevent proper interaction with the Redis server.

Solutions to Resolve the Error

Here are a couple of tailored solutions you can use to fix the java.lang.RuntimeException error without needing to restart your computer every time:

1. Stop Existing Redis Services

The first step to troubleshooting this issue is checking for any currently running Redis instances outside your Integrated Development Environment (IDE). You can follow these steps:

Access Task Manager:

Press Ctrl + Shift + Esc or right-click the Taskbar and select Task Manager.

Identify Redis Processes:

Look for any Redis-related services under the 'Processes' tab. If you find any, select them and click End Task to terminate the process.

Relaunch Your Application:

After stopping existing Redis services, try running your Spring Boot application again to check if it launches successfully.

2. Change the Embedded Redis Port

If stopping Redis services does not work or if you want an easier approach, consider changing the port for your embedded Redis server. Follow these easy steps:

Locate Redis Configuration:

Open your Spring Boot configuration file (such as application.properties or application.yml).

Modify the Port Setting:

Define the embedded Redis server to use a different port (e.g., 6379 is the default; you might want to try a lesser-used port like 6380). Here's how you can specify it in your configuration file:

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Relaunch Your Application:

After making these changes, relaunch your application to see if the issue persists.

Considerations for Users Without Admin Rights

If you are working on a machine without administrative privileges, be cautious about the services you can stop or configurations you can change. The above solutions provide practical steps that don't require admin rights, ensuring you can resolve the issue effectively.

Conclusion

Encountering the java.lang.RuntimeException: Can't start redis server message can be frustrating, especially during development. However, with the right approach, you can quickly troubleshoot and fix the problem. By stopping any existing Redis services or adjusting the embedded Redis port, you can avoid the need to restart your machine continuously.

If the problem continues even after trying these solutions, consider seeking help from your team or online communities for additional insights. Happy coding!