Скачать или смотреть Resolving NumberFormatException for Bigint in Java with Spring JDBC

Discover how to effectively handle `NumberFormatException` in your Spring JDBC applications when dealing with PostgreSQL bigint data types.
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This video is based on the question https://stackoverflow.com/q/63521302/ asked by the user 'Gen' ( https://stackoverflow.com/u/5259625/ ) and on the answer https://stackoverflow.com/a/63522079/ provided by the user 'Akhilesh Mishra' ( https://stackoverflow.com/u/7772483/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the NumberFormatException Issue

If you are working with PostgreSQL and Spring JDBC, you might have encountered a NumberFormatException when trying to retrieve a bigint value from your database. This might seem confusing, especially if your code appears to be correctly set up. In this guide, we will explore why this exception occurs and how to resolve it effectively.

The Problem Breakdown

In your case, the error message reads:

[[See Video to Reveal this Text or Code Snippet]]

This indicates that the application fails while converting the provided phone number into an integer. Let’s examine the components involved:

Database Setup:

You have a column called phone that is of type bigint.

Java Method:

Your method signature defines phone as an int:

[[See Video to Reveal this Text or Code Snippet]]

Input Value:

The phone number 7894561230 exceeds the maximum value representable by an int in Java, which is 2147483647. This leads to the NumberFormatException.

The Solution

To correct this error, you need to adjust the data type in your Java code to accommodate the larger numbers associated with a bigint data type. Here’s how you can do that step by step:

1. Change the Data Type

Instead of using int, use long in your method definition. This allows your application to handle larger values that exceed the integer limit.

Updated Method Signature

Update your method as follows:

[[See Video to Reveal this Text or Code Snippet]]

2. Adjust Your Bean Class

Since you also want to store phone numbers in your UserDetails class without any loss of data, update the phone attribute from String to long. Here’s the updated class definition:

[[See Video to Reveal this Text or Code Snippet]]

Example of Updated Database Query

Your SQL query remains the same, as you are still querying with the bigint type:

[[See Video to Reveal this Text or Code Snippet]]

3. Testing

After making these changes, it’s essential to test your application to ensure that fetching user details using phone numbers works correctly without any exceptions.

Conclusion

Handling NumberFormatException in Java when dealing with database types like bigint can be solved by simply changing your data types from int to long. This change allows you to accommodate larger numbers that would otherwise result in errors.

By following the steps outlined above, you can efficiently resolve the issue and continue building your application with confidence. If you run into any other challenges while working with Spring JDBC or PostgreSQL, feel free to reach out!