Spring Data Mongodb Gridfs

In this tutorial, you'll learn about Fix Spring Data MongoDB GridFS File Not Storing. We cover key concepts, practical examples, and best practices.

The Problem

Large files fail to upload or download with corrupt data when using GridFS.

Quick Fix

Inject GridFsTemplate

Wrong:

// GridFsTemplate not injected

Output:

Cannot access GridFS

Right:

@Autowired
private GridFsTemplate gridFsTemplate;

Output:

GridFsTemplate injected

Use store() correctly

Wrong:

gridFsTemplate.store(file.getInputStream(), file.getName())
// No metadata

Output:

File stored without metadata

Right:

DBObject meta = new BasicDBObject("userId", userId);
gridFsTemplate.store(file.getInputStream(), file.getName(), meta);

Output:

File stored with metadata

Use getResource() to retrieve

Wrong:

// Using find() inappropriately

Output:

Cannot read file content

Right:

GridFSFile file = gridFsTemplate.findOne(query);
Resource resource = gridFsTemplate.getResource(file);
InputStream is = resource.getInputStream();

Output:

File content readable

Prevention

• Inject GridFsTemplate into the service
• Use store() to save files and getResource() to retrieve
• Add metadata for easy querying

Common Mistakes with data mongodb gridfs

1. Misunderstanding that String is [Char] with poor performance for large text operations
2. Using foldl instead of foldl' causing stack overflow on large lists
3. Forgetting deriving (Show, Eq) on custom data types needed for debugging

These mistakes appear frequently in real-world SPRING code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech Spring & JVM ecosystem series. Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro.