php小编新一今天为大家介绍的是spring amqp，它是一种基于amqp协议的消息传递框架。然而，有时候在使用spring amqp时，我们可能会遇到一个错误：“未找到兼容的身份验证机制 - 提供服务器”。这个错误提示可能会让人感到困惑，不知道应该如何解决。接下来，我们将详细解释这个错误的原因，并提供解决方案，帮助大家顺利使用spring amqp框架。
问题内容
我正在尝试通过外部身份验证机制将 spring boot 应用程序连接到 rabbit mq (https://github.com/rabbitmq/rabbitmq-auth-mechanism-ssl)。
我收到以下错误：
org.springframework.amqp.amqpioexception: java.io.ioexception: no compatible authentication mechanism found - server offered []
at org.springframework.amqp.rabbit.support.rabbitexceptiontranslator.convertrabbitaccessexception(rabbitexceptiontranslator.java:70) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.connection.abstractconnectionfactory.createbareconnection(abstractconnectionfactory.java:594) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.connection.cachingconnectionfactory.createconnection(cachingconnectionfactory.java:687) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.connection.connectionfactoryutils.createconnection(connectionfactoryutils.java:257) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.core.rabbittemplate.doexecute(rabbittemplate.java:2225) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.core.rabbittemplate.execute(rabbittemplate.java:2198) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.core.rabbittemplate.execute(rabbittemplate.java:2178) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.core.rabbitadmin.getqueueinfo(rabbitadmin.java:459) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.core.rabbitadmin.getqueueproperties(rabbitadmin.java:443) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.listener.abstractmessagelistenercontainer.attemptdeclarations(abstractmessagelistenercontainer.java:1891) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.listener.abstractmessagelistenercontainer.redeclareelementsifnecessary(abstractmessagelistenercontainer.java:1858) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.listener.simplemessagelistenercontainer$asyncmessageprocessingconsumer.initialize(simplemessagelistenercontainer.java:1384) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.listener.simplemessagelistenercontainer$asyncmessageprocessingconsumer.run(simplemessagelistenercontainer.java:1230) ~[spring-rabbit-3.0.5.jar:3.0.5]
at java.base/java.lang.thread.run(thread.java:833) ~[na:na]
caused by: java.io.ioexception: no compatible authentication mechanism found - server offered []
at com.rabbitmq.client.impl.amqconnection.start(amqconnection.java:343) ~[amqp-client-5.17.0.jar:5.17.0]
at com.rabbitmq.client.connectionfactory.newconnection(connectionfactory.java:1225) ~[amqp-client-5.17.0.jar:5.17.0]
at com.rabbitmq.client.connectionfactory.newconnection(connectionfactory.java:1173) ~[amqp-client-5.17.0.jar:5.17.0]
at org.springframework.amqp.rabbit.connection.abstractconnectionfactory.connectaddresses(abstractconnectionfactory.java:632) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.connection.abstractconnectionfactory.connect(abstractconnectionfactory.java:607) ~[spring-rabbit-3.0.5.jar:3.0.5]
at org.springframework.amqp.rabbit.connection.abstractconnectionfactory.createbareconnection(abstractconnectionfactory.java:557) ~[spring-rabbit-3.0.5.jar:3.0.5]
... 12 common frames omitted
依赖关系：
<dependency>
<groupid>org.springframework.boot</groupid>
<artifactid>spring-boot-starter-amqp</artifactid>
<version>3.2.1</version>
</dependency>
rabbitmq版本：rabbitmq:3.12.1-management
rabbitmq.conf 包含这些属性：
default_user=guest default_pass=guest listeners.tcp=none listeners.ssl.default=5672 ssl_options.cacertfile=/etc/rabbitmq/cert/ca_bundle.pem ssl_options.certfile=/etc/rabbitmq/cert/certificate.pem ssl_options.keyfile=/etc/rabbitmq/cert/key.pem ssl_options.password=pass ssl_options.verify=verify_peer ssl_options.fail_if_no_peer_cert=true ssl_options.versions.1=tlsv1.2 ssl_options.depth=1 auth_mechanisms.1=external ssl_cert_login_from=common_name
应用程序属性：
spring.rabbitmq.ssl.enabled=true spring.rabbitmq.ssl.algorithm=tlsv1.2 spring.rabbitmq.ssl.key-store=keystore.p12 spring.rabbitmq.ssl.key-store-password=pass spring.rabbitmq.ssl.key-store-type=pkcs12 spring.rabbitmq.ssl.trust-store=truststore.p12 spring.rabbitmq.ssl.trust-store-password=pass spring.rabbitmq.ssl.trust-store-type=pkcs12
我声明了以下方法来包含 sasl 配置：
@Bean
public AmqpTemplate amqpTemplate(ConnectionFactory connectionFactory) {
CachingConnectionFactory cachingConnectionFactory = (CachingConnectionFactory) connectionFactory;
cachingConnectionFactory.getRabbitConnectionFactory().setAutomaticRecoveryEnabled(true);
cachingConnectionFactory.getRabbitConnectionFactory().setSaslConfig(DefaultSaslConfig.EXTERNAL);
cachingConnectionFactory.resetConnection();
RabbitTemplate rabbitTemplate = new RabbitTemplate(cachingConnectionFactory);
rabbitTemplate.setMessageConverter(converter());
return rabbitTemplate;
}解决方法
我不确定 rabbitmq 配置端的 listeners.ssl.default=5672 是什么，但听起来您将默认的 ssl 端口覆盖到该端口。
spring boot中的逻辑是这样的：
return (optional.ofnullable(getssl().getenabled()).orelse(false)) ? default_port_secure : default_port;
地点：
private static final int default_port_secure = 5671;
因此，可能需要考虑明确提供该端口：
spring.rabbitmq.port=5672
您可能也不需要自定义 rabbittemplate bean，只需添加 connectionfactorycustomizer 即可将 defaultsaslconfig.external 设置为自动配置的 com.rabbitmq.client.connectionfactory。
也不建议使用 setautomaticrecoveryenabled(true): https://www.php.cn/link/3c0de3fec9ab8a3df01109251f137119
