Resolving the package org.apache.flink.api.java.io.jdbc does not exist Error in Apache Flink

Learn how to fix the error regarding the JDBC connector in Apache Flink by updating your imports and dependencies effectively.
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This video is based on the question https://stackoverflow.com/q/68031317/ asked by the user 'phisinger' ( https://stackoverflow.com/u/14254584/ ) and on the answer https://stackoverflow.com/a/68031560/ provided by the user 'phisinger' ( https://stackoverflow.com/u/14254584/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

If you are working on an Apache Flink application and recently encountered the error message package org.apache.flink.api.java.io.jdbc does not exist, you are not alone. Many developers face similar issues while integrating JDBC connectors in their Flink applications due to changes in package organization. In this guide, we will discuss how to resolve this problem while successfully utilizing the JDBC connector in your Flink project.

Understanding the Problem

When you include a dependency for the JDBC connector in your Maven pom.xml file like this:

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you expect Maven to fetch the required classes and libraries from the specified group ID and artifact ID. However, upon compiling your project using the command mvn clean package -Pbuild-jar, you encounter the error indicating that the org.apache.flink.api.java.io.jdbc package is missing.

Solution: Updating Your Imports and Package Usage

Key Changes to Implement

Updated Package: The org.apache.flink.api.java.io.jdbc package has been deprecated. You should now use org.apache.flink.connector.jdbc. This change requires minor modifications in your code to reflect the new package structure.

Class Name Changes: Additionally, you will need to replace the classes JDBCInputFormat and JDBCOutputFormat with new class names JdbcInputFormat and JdbcOutputFormat, respectively.

Step-by-Step Guide

Here’s how to implement these changes effectively in your code:

1. Modify Your Imports

Replace your existing imports with the updated package as shown below:

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2. Update Your Code to Utilize New Classes

Make sure to update the segment of your code involving input and output formats. For example, change:

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To:

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3. Recompile Your Project

After making these updates, re-run the Maven build command:

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This time, you should not receive the error related to the missing package.

Conclusion

By updating your imports and adjusting your class names according to the current structures in Apache Flink, you can effectively resolve the issue of "package org.apache.flink.api.java.io.jdbc does not exist." Always ensure you are utilizing the most recent libraries and dependencies in your projects to avoid compatibility issues. Happy coding!