apache/dubbo

[Feature] How does Dubbo achieve the effect of Spring's @ConditionalOnMissingBean?

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#15814 opened on Dec 1, 2025

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Description

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Apache Dubbo Component

Java SDK (apache/dubbo)

Descriptions

TestProvider has two implementation classes, TestServiceImpl and TestServiceExtImpl. I want to use @ConditionalOnMissingBean to load TestServiceImpl if the bean does not exist. How can I do this?

`

public interface TestProvider { String getName(); }

@ConditionalOnMissingBean(TestProvider.class) @DubboService(interfaceClass = TestProvider.class) public class TestServiceImpl implements TestService { @Override public String getName() { return "getName:TestServiceImpl:"; } }

@DubboService(interfaceClass = TestProvider.class) public class TestServiceExtImpl extends TestServiceImpl{ @Override public String getName() { return "TestServiceExtImpl:"; } } `

Related issues

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Code of Conduct

Contributor guide

Tech stack
javaspring
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
JavaSpringDubbo basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how Dubbo currently handles bean loading and conditional registration. Review the Dubbo service export process, particularly in ServiceBean and related classes. Consider deriving from Spring's @ConditionalOnMissingBean logic and integrating similar condition evaluation in Dubbo's annotation processing. Check existing issues and discussions about conditional service export for any prior work or maintainer guidance.