Keycloak Admin Client获取Token报错：Unrecognized field 'access_token'

我在使用Keycloak Admin Client获取访问令牌时遇到Jackson反序列化错误，错误核心是Unrecognized field "access_token"：Keycloak返回的JSON包含access_token字段，但org.keycloak.representations.AccessTokenResponse类中没有对应的映射配置（已知字段包括token、tokenType等）。执行以下代码时触发该错误：

// 创建Keycloak客户端
Keycloak keycloak = KeycloakBuilder.builder()
        .serverUrl(keycloakUrlAuth)
        .realm(keycloakRealm)
        .grantType(OAuth2Constants.CLIENT_CREDENTIALS)
        .clientId(keycloakClientId)
        .clientSecret(keycloakClientSecret)
        .build();
// 获取访问令牌
AccessTokenResponse token = keycloak.tokenManager().getAccessToken();
return token.getToken();

完整错误日志： #

at [Source: (org.jboss.resteasy.client.jaxrs.internal.ClientResponse$InputStreamWrapper); line: 1, column: 18] (through reference chain: org.keycloak.representations.AccessTokenResponse["access_token"]): javax.ws.rs.client.ResponseProcessingException: javax.ws.rs.ProcessingException: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "access_token" (class org.keycloak.representations.AccessTokenResponse), not marked as ignorable (10 known properties: "tokenType", "notBeforePolicy", "otherClaims", "token", "sessionState", "refreshExpiresIn", "scope", "expiresIn", "refreshToken", "idToken"])
docker-jboss-1  |  at [Source: (org.jboss.resteasy.client.jaxrs.internal.ClientResponse$InputStreamWrapper); line: 1, column: 18] (through reference chain: org.keycloak.representations.AccessTokenResponse["access_token"])
docker-jboss-1  |       at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.extractResult(ClientInvocation.java:138)
docker-jboss-1  |       at org.jboss.resteasy.client.jaxrs.internal.proxy.extractors.BodyEntityExtractor.extractEntity(BodyEntityExtractor.java:60)
docker-jboss-1  |       at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:104)
docker-jboss-1  |       at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76)
docker-jboss-1  |       at com.sun.proxy.$Proxy519.grantToken(Unknown Source)
docker-jboss-1  |       at org.keycloak.admin.client.token.TokenManager.grantToken(TokenManager.java:99)
docker-jboss-1  |       at org.keycloak.admin.client.token.TokenManager.getAccessToken(TokenManager.java:75)

项目pom.xml配置： #

<properties>
    <jackson-version>2.13.3</jackson-version>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>7.0</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-jaxrs</artifactId>
    <version>3.0.26.Final-redhat-1</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-cdi</artifactId>
    <version>3.0.26.Final-redhat-1</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-multipart-provider</artifactId>
    <version>3.0.26.Final-redhat-1</version>
    <scope>provided</scope>
</dependency>

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-cache-core</artifactId>
    <version>3.1.4.Final</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-base</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.jaxrs</groupId>
    <artifactId>jackson-jaxrs-json-provider</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.module</groupId>
    <artifactId>jackson-module-jaxb-annotations</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>${jackson-version}</version>
</dependency>

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-jackson2-provider</artifactId>
    <version>3.0.26.Final-redhat-1</version>
    <exclusions>
        <exclusion>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-core</artifactId>
    <version>20.0.5</version>
</dependency>
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-adapter-core</artifactId>
    <version>20.0.5</version>
</dependency>
<dependency>
    <groupId>org.keycloak</groupId>
    <artifactId>keycloak-admin-client</artifactId>
    <version>20.0.5</version>
</dependency>

jboss-deployment-structure.xml配置（为适配OpenAPI排除内置Jackson模块，使用自定义版本）： #

<jboss-deployment-structure>
    <deployment>
        <dependencies>
            <system export="true">
                <paths>
                    <path name="sun/reflect"/>
                </paths>
            </system>
        </dependencies>
        <exclusions>
            <module name="org.dom4j"/>
            <module name="com.fasterxml.jackson.core.jackson-core"/>
            <module name="com.fasterxml.jackson.core.jackson-annotations"/>
            <module name="com.fasterxml.jackson.core.jackson-databind"/>
            <module name="com.fasterxml.jackson.datatype.jackson-datatype-jdk8"/>
            <module name="com.fasterxml.jackson.datatype.jackson-datatype-jsr310"/>
            <module name="com.fasterxml.jackson.jaxrs.jackson-jaxrs-json-provider"/>
            <module name="org.jboss.resteasy.resteasy-jackson2-provider"/>
            <module name="org.jboss.resteasy.resteasy-jackson-provider"/>
        </exclusions>
    </deployment>
</jboss-deployment-structure>

我尝试过调整依赖版本、排除冲突依赖等多种方法，但问题仍未解决，恳请大家帮忙。

内容的提问来源于stack exchange，提问作者Greg