SpringBoot 连接kafka ssl 报 CertificateException: No subject alternative names present 异常解决

当使用较新版本SpringBoot时，对应的 kafka-client 版本也比较新，如果使用了 2.x 以上的 kafka-client ，并且配置了 kafka ssl 连接方式时，可能会报如下异常：

javax.net.ssl.SSLException: Inbound closed before receiving peer's close_notify: possible truncation attack?

.....

org.apache.kafka.common.errors.SslAuthenticationException: SSL handshake failed
Caused by: javax.net.ssl.SSLHandshakeException: General SSLEngine problem

.....

Caused by: java.security.cert.CertificateException: No subject alternative names present

.....

2019-10-09 10:12:55.683 DEBUG 23524 --- [           main] o.s.kafka.core.KafkaTemplate             : Failed to send: ProducerRecord

.....

该原因是因为新版本 kafka-client 会校验证书的主机名，配置忽略主机名校验即可。

配置方法主要代码如下：

1 spring:
2   kafka:
3     properties:
4       ssl:
5         endpoint:
6           identification:
7             algorithm: ''

另附SpringBoot 使用 ssl 证书连接 kafka 完整配置如下：

 1 ########## kafka ##########
 2 spring:
 3   kafka:
 4     producer:
 5       batch-size: 16384
 6       retries: 1
 7       buffer-memory: 33554432
 8       bootstrap-servers: 192.168.1.100:9092
 9       value-serializer: org.apache.kafka.common.serialization.StringSerializer
10       key-serializer: org.apache.kafka.common.serialization.StringSerializer
11     consumer:
12       group-id: test-group-001
13       auto-offset-reset: earliest
14       auto-commit-interval: 100
15       bootstrap-servers: 192.168.1.100:9092
16       value-deserializer: org.apache.kafka.common.serialization.StringDeserializer
17       key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
18       enable-auto-commit: true
19     ssl:
20       protocol: SSL
21       trust-store-type: JKS
22       trust-store-location: file:D:/source-files/kafka/kafkatest.client.truststore.test.jks
23       trust-store-password: 123456
24       key-store-type: JKS
25       key-store-location: file:D:/source-files/kafka/kafkatest.client.keystore.test.jks
26       key-store-password: 123456
27       key-password: 123456
28     properties:
29       ssl:
30         endpoint:
31           identification:
32             algorithm: ''
33       security:
34         protocol: SSL

问题解决。