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The issue of Spring Boot not loading the NacosConfigBootstrapConfiguration class often arises due to misconfigurations or compatibility issues between Spring Boot and Nacos. Here are the main reasons and solutions:

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1. Spring Boot Version and Nacos Spring Boot Starter Version Mismatch

The NacosConfigBootstrapConfiguration class is part of the spring-cloud-alibaba or nacos-spring-boot dependencies. If there is a version mismatch between Spring Boot and the Nacos starter, the class may not be loaded.

Solution:

• Check your Spring Boot version.
• Ensure that the version of spring-cloud-alibaba or nacos-spring-boot you are using is compatible with your Spring Boot version.

For example:

• For Spring Boot 2.3.x, use spring-cloud-alibaba 2.2.x.RELEASE.
• For Spring Boot 2.5.x, use spring-cloud-alibaba 2021.x.

Refer to the official compatibility table for accurate version mappings.

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2. Spring Boot Changed the Bootstrap Context in 2.4.x

Starting with Spring Boot 2.4, the bootstrap.properties or bootstrap.yml mechanism was replaced by the spring.config.import property. If you're using a version after Spring Boot 2.4.x, the configuration loading behavior has changed, and you might need to adjust your configuration files.

Solution:

• Migrate from bootstrap.yml to application.yml.
• Use spring.config.import=nacos: to explicitly define Nacos configuration.

Example:

spring: config: import: nacos://localhost:8848 nacos: config: server-addr: localhost:8848

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3. Nacos Dependencies Missing in Classpath

If the NacosConfigBootstrapConfiguration class is not in your project, it might be due to missing or incorrectly included dependencies.

Solution:

Ensure you have the correct dependencies in your pom.xml (for Maven) or build.gradle (for Gradle).

For Maven:

<dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId> <version>2021.0.4.0</version> </dependency>

For Gradle:

implementation 'com.alibaba.cloud:spring-cloud-starter-alibaba-nacos-config:2021.0.4.0'

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4. Incorrect Configuration in application.yml or bootstrap.yml

If the server-addr or other required properties are not specified correctly, Nacos will fail to initialize.

Solution:

Ensure your configuration file includes the necessary properties:

spring: cloud: nacos: config: server-addr: localhost:8848

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5. Nacos Configuration Not Activated

If the application profile or configuration is not correctly set up, the Nacos configuration may not be activated.

Solution:

• Ensure you have the correct Spring profiles (application.properties or application.yml) activated.
• Check for spring.profiles.active in your configurations.

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Debugging Steps

1. Check Logs: Look for any errors or warnings during application startup that reference Nacos configuration.
2. Enable Debug Logging: Add -Dlogging.level.com.alibaba.nacos=DEBUG to the JVM arguments to see detailed logs for Nacos.
3. Validate Dependencies: Use tools like mvn dependency:tree to ensure the required dependencies are correctly resolved.