Exception in thread “ReadStationsThread” java.lang.NoClassDefFoundError: okio/Buffer at okhttp3@4.9.3

The java.lang.NoClassDefFoundError you’re encountering, specifically related to okio/Buffer within okhttp3@4.9.3, is likely due to a missing or incompatible version of the Okio library. To address this issue, you should ensure that the correct version of Okio is included in your project’s dependencies. Here’s how you can resolve the issue:

1. Add Okio Dependency: Add the Okio library as a dependency to your project. You can do this through your build tool (Maven, Gradle, etc.). If you’re using Maven, add the following dependency to your pom.xml:

<dependency>
    <groupId>com.squareup.okio</groupId>
    <artifactId>okio</artifactId>
    <version>2.10.0</version> <!-- Use a version compatible with OkHttp 4.9.3 -->
</dependency>

If you’re using Gradle, add the following to your build.gradle:

implementation 'com.squareup.okio:okio:2.10.0' // Use a version compatible with OkHttp 4.9.3

2. Check Dependencies: Make sure you’re not inadvertently including conflicting versions of Okio or related libraries. Having multiple versions of the same library can lead to classpath issues.
3. Clean and Rebuild: After adding the Okio dependency, clean and rebuild your project to ensure that the new dependency is resolved and included correctly.
4. Check OkHttp Compatibility: Verify that the version of Okio you’re using is compatible with OkHttp 4.9.3. Both libraries should be of compatible versions to avoid runtime issues.
5. Import Correct Classes: In your Java code, ensure that you’re importing classes from the correct packages. For example:

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

// ... your code ...

6. Sample Solution Code: Below is a simple example of how you might use OkHttp to perform an HTTP GET request. Make sure to adapt this code to your specific use case:

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import java.io.IOException;

public class OkHttpExample {

    public static void main(String[] args) {
        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url("https://example.com")
                .build();

        try (Response response = client.newCall(request).execute()) {
            if (response.isSuccessful()) {
                System.out.println(response.body().string());
            } else {
                System.err.println("Request failed with code: " + response.code());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Remember to replace the URL in the Request.Builder().url() method with the actual URL you want to request.

If you continue to encounter issues, double-check your build configurations, dependencies, and import statements. Also, ensure that the OkHttp and Okio versions are compatible as per the documentation.