How to Display ArrayList Content in Thymeleaf Loop without Errors

Learn how to solve the common issue of displaying an ArrayList in Thymeleaf by correctly using this template engine's iteration capabilities.
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How to Display ArrayList Content in Thymeleaf Loop without Errors

Displaying items from a database can sometimes be tricky, and developers using Thymeleaf within a Spring application often encounter issues. One common problem arises when trying to iterate over an ArrayList to display its content in an HTML file. This guide will explore how to effectively display an ArrayList in Thymeleaf and troubleshoot a common error that developers face: the dreaded Whitelabel Error Page.

The Problem

You might be trying to display items from a database using the Java Spring framework and Thymeleaf, but running into issues when attempting to iterate through your ArrayList. In particular, you might find that direct access patterns yield results, but using iteration does not, resulting in error pages.

Here’s a brief summary of the situation:

Working Example (displaying a single item):

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

Not Working Example (trying to iterate):

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

The above code leads to an error when trying to iterate over the item list. Let’s break down how to fix this issue.

Solution

To properly display the items in your ArrayList in Thymeleaf using a loop, you need to ensure that the variables being referenced in your th:each iteration correspond correctly with what you intend to display. Follow the steps below to resolve the issue:

Step 1: Correctly Use the Iteration Variables

In your Thymeleaf loop, the expression you're using to display the item names needs to reference the loop variable correctly. The correct way to do this is to replace item.getItemName() with person.getItemName(), where person is the variable name defined in the th:each attribute.

Here’s the corrected code:

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

Step 2: Ensure Your Java Code is Correct

Make sure your server-side code is functioning correctly to populate the ArrayList. Here's an example of how to fetch items from a repository and filter them based on some criterion:

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

Brief Summary of the Key Changes

Change item.getItemName() to person.getItemName(): This uses the proper variable defined in the Thymeleaf loop.

Ensure the ArrayList is populated correctly in your Java code.

Conclusion

By following the outlined steps above, you should now be able to display your ArrayList content in a Thymeleaf loop without encountering the Whitelabel Error Page. Remember that correct variable references within Thymeleaf loops are crucial for ensuring that your templates render as expected. Happy coding!

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