Spring Boot集成Keycloak时找不到KeycloakSpringBootConfigResolver类

我正在搭建Spring Boot（2.7.10）与Keycloak（16.1.0）的集成环境，但编译时提示找不到org.keycloak.adapters.springboot.KeycloakSpringBootConfigResolver类。

配置类路径：src/main/java/com/example/tutorial/config/KeyCloakConfiguration.java

package com.example.tutorial.config;

import org.keycloak.adapters.KeycloakConfigResolver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.keycloak.adapters.springboot.KeycloakSpringBootConfigResolver;


@Configuration
public class KeyCloakConfiguration {
    @Bean
    public KeycloakConfigResolver KeycloakConfigResolver() {
        return new KeycloakSpringBootConfigResolver();
    }
}

pom.xml配置：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.10</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>tutorial</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>tutorial</name>
    <description>Tutorial project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <spring-security.version>5.6.1</spring-security.version>
        <spring.version>5.3.9</spring.version>
    </properties>
    <dependencies>
        <!-- Spring Security dependencies -->
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-core</artifactId>
            <version>${spring-security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-web</artifactId>
            <version>${spring-security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-config</artifactId>
            <version>${spring-security.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- Other dependencies -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.22</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.keycloak</groupId>
            <artifactId>keycloak-core</artifactId>
            <version>16.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.keycloak</groupId>
            <artifactId>keycloak-common</artifactId>
            <version>16.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.keycloak</groupId>
            <artifactId>keycloak-spring-boot-starter</artifactId>
            <version>16.1.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.keycloak</groupId>
                    <artifactId>keycloak-spring-boot-2-adapter</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.keycloak</groupId>
            <artifactId>keycloak-admin-client</artifactId>
            <version>16.1.0</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.keycloak.bom</groupId>
                <artifactId>keycloak-adapter-bom</artifactId>
                <version>16.1.0</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

我已经执行过mvn clean install -U -DskipTests，也在IntelliJ中刷新了Maven依赖，但问题仍未解决。

核心原因 #

你在keycloak-spring-boot-starter中排除了keycloak-spring-boot-2-adapter依赖，而org.keycloak.adapters.springboot.KeycloakSpringBootConfigResolver类正是定义在这个适配器模块里的。

修复步骤 #

1. 移除keycloak-spring-boot-starter中的排除配置，修改后的依赖片段如下：

<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-spring-boot-starter</artifactId>
    <version>16.1.0</version>
    <!-- 删除原有的exclusions节点 -->
</dependency>

2. 重新执行Maven命令刷新依赖：

mvn clean install -U -DskipTests

3. 在IntelliJ中再次执行Maven > Reload Project，确保依赖被正确加载。

额外优化建议 #

• 你手动指定了spring-security和spring-web的版本，这可能与Spring Boot父依赖管理的版本冲突。建议移除这些手动版本声明，直接使用Spring Boot父依赖提供的版本，避免潜在的兼容性问题。
• Keycloak 16.1.0属于较旧版本，后续可以考虑升级到更稳定的新版本（比如20+），同时注意与Spring Boot版本的兼容性匹配。

内容的提问来源于stack exchange，提问作者fudu