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I will fix java spring boot mybatis backend bugs and API errors
zi hanli
About this gig
Is your Java backend returning errors, failing database operations, or producing incorrect API results?
I will diagnose and fix clearly defined issues in your existing Java backend application.
I can help with:
- Java and Spring Boot errors
- MyBatis mapper and SQL issues
- REST API bugs
- Database connection problems
- Incorrect query results
- Null pointer and runtime exceptions
- Backend validation and business logic
- Maven dependency or build problems
- Performance investigation
- Code cleanup related to the reported issue
Please send me the error message, relevant code, steps to reproduce the problem, and the expected result before ordering.
This Gig covers bug fixing in an existing project. New modules, major feature development, server migration, and full application development require a separate quotation.
For Standard or Premium work, please contact me before ordering so I can confirm the scope.
Get to know zi hanli
zi hanli
Java Backend AI Development Expert
- FromChina
- Member sinceAug 2026
- Avg. response time1 hour
Languages
English, Chinese
Hi! I'm a professional software developer specializing in Java backend development, AI integration, and enterprise applications. I have experience with Java, Spring Boot, MySQL, Redis, Docker, Angular, REST APIs, Dify, AI Agents, OpenAI and Claude APIs.
I can help with backend development, API integration, bug fixing, database optimization, ERP/business systems, AI chatbots, knowledge bases, Dify workflows, and AI-powered applications.
I focus on clean code, reliable solutions, clear communication, and delivering practical results. Feel free to contact me to discuss your project!
Other Software Development Services I Offer
FAQ
What information do you need before starting?
Please provide the error message, logs, steps to reproduce the issue, expected behavior, relevant source code, Java and framework versions, database type, and project startup instructions.
Can you fix bugs in an existing Spring Boot project?
Yes. I can diagnose and fix issues in existing Java and Spring Boot projects when the relevant source code, configuration, logs, and reproduction steps are available.
Can you fix MyBatis and SQL problems?
Yes. I can investigate mapper XML, annotations, parameter binding, database fields, incorrect query results, transaction issues, and related SQL errors.
Does this Gig include new feature development?
No. This Gig focuses on fixing existing behavior. New pages, modules, integrations, or major changes require a separate scope and quotation.
Will you need access to my production server?
Usually no. A local, development, or staging environment is preferred. If remote access is necessary, the scope and access method must be agreed upon in advance.
What is included in a revision?
A revision covers reasonable corrections related to the originally reported bug. New bugs, unrelated modules, or changed requirements are treated as additional work.
