The issue of "RuntimeError: Java gateway process exited before sending its port number" arises while running "SparkSession.builder.appName('Practise').getOrCreate()".

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This error is usually caused by the following reasons:

1. The Java Virtual Machine (JVM) is unable to allocate enough memory to the gateway process and it crashes.

2. The JVM is unable to start the gateway process due to a lack of available resources.

3. There is some issue with the configuration settings of your environment that is preventing the gateway process from running properly.

To resolve this error, you can try the following:

1. Increase the amount of memory allocated to the gateway process by setting the SPARKDRIVERMEMORY environment variable.

2. Modify the configuration settings of your environment to ensure that enough resources are available to start the JVM.

3. Check for any networking or firewall issues that may be preventing the JVM from starting the gateway process.

4. Restart your system and try again.

5. If none of the above solutions work, try downloading and installing the latest version of Spark to see if that resolves the issue.