Modified these files to ensure that proper error is displayed while r…

[ritankarsaha]

FIXES #3105
Running selenium server locally without installing java first in the system

###Usage Examples

// example-usage.js
const SeleniumServiceBuilder = require('./services/selenium-service-builder.js');

const settings = {
  selenium: {
    port: 4444,
    loopback: '127.0.0.1',
    env: {}, // Add any environment variables if needed
    stdio: 'inherit', // Adjust as needed
    cli_args: {
      // Example JVM arguments
      // 'webdriver.chrome.driver': '/path/to/chromedriver',
      // Add other CLI arguments as needed
    },
    jvmArgs: [
      // Example JVM arguments
      '-Xmx2g',
      '-Xms1g',
    ],
  },
  webdriver: {
    server_path: '/path/to/selenium-server-4.x.x.jar', // Update this path
    command: 'standalone', // or any other command as per Selenium 4
  },
};

(async () => {
  const seleniumService = new SeleniumServiceBuilder(settings);
  seleniumService.setCliArgs();
  try {
    await seleniumService.createService({
      showSpinner: (message) => {
        // Implement spinner display if desired
        console.log(message);
      },
    });
    // Selenium Server is now running
  } catch (error) {
    console.error('Failed to start Selenium Server:', error);
    process.exit(1);
  }
})();

Changes Made

1. Import Required Modules

The following modules were imported to enhance the functionality of the service builder:

• which: Used to locate the Java executable in the system's PATH.
• fs.promises: Provides asynchronous file system operations.
• Logger: Assumed to be exported from a utility module for logging purposes.

2. Modified SeleniumServer4 Constructor

• Parameter Addition: The constructor now accepts javaPath as the first parameter, decoupling Java detection from the constructor logic.
• Usage of javaPath: The detected Java executable path is passed to the parent DriverService class.

3. Added findJavaExecutable Method

• Purpose: This method asynchronously checks for the presence of Java by first looking at the JAVA_HOME environment variable and then falling back to searching the system's PATH.
• Error Handling: Descriptive errors are thrown if Java is not found or is not executable.

4. Added checkExecutable Method

• Purpose: Verifies that the Java executable exists and is executable.
• Usage: This method is called within findJavaExecutable to ensure the Java binary is usable.

5. Modified createService Method

• Java Detection: The method now calls findJavaExecutable to retrieve the Java executable path before proceeding.
• Error Handling: It catches and logs errors related to Java detection or Selenium Server startup.
• Service Initialization: The detected javaPath is passed to the SeleniumServer4 constructor.

6. Caching Java Path

• Variable: Introduced _javaPath to cache the detected Java path, avoiding redundant checks in subsequent service starts.

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