线上环境出现：org.apache.kafka.common.serialization.StringSerializer is not an instance of org.apache.kafka.common.serialization.Serializer，本地没有

[Jeff <zi...@126.com>]

在本地IDEA里测试处理相同TOPIC正常，但在线上环境出现了这样的异常：
org.apache.kafka.common.serialization.StringSerializer is not an instance of org.apache.kafka.common.serialization.Serializer。将StringSerializer 换成 ByteArraySerializer也是类似错误，不知道该如何解决该问题了。请问还有其它思路来解决这个问题吗？ 
业务逻辑非常简单：从SOURCE表内过滤数据到sink表。
flink版本：1.11.1 kafka版本：2.1.0


SQL内KAFKA配置如下：
source:
create table *******
with (
'connector' = 'kafka',
'topic'='**********',
'scan.startup.mode'='latest-offset',
'format'='json',
'properties.group.id' = '***********',
'properties.bootstrap.servers'='***********:9092',
'properties.enable.auto.commit'='true',
'properties.auto.commit.interval.ms'='1000',
'properties.key.deserializer'='org.apache.kafka.common.serialization.StringDeserializer',
'properties.value.deserializer'='org.apache.kafka.common.serialization.StringDeserializer',
'properties.security.protocol'='SASL_PLAINTEXT',
'properties.sasl.mechanism'='PLAIN',
'properties.sasl.jaas.config'='org.apache.kafka.common.security.plain.PlainLoginModule required username=\"****\" password=\"****\";');


sink:
create table *******
with (
'connector' = 'kafka',
'topic'='*******',
'scan.startup.mode'='latest-offset',
'format'='json',
'properties.bootstrap.servers'='*****:9092',
'properties.max.poll.records'='50',
'properties.enable.auto.commit'='true',
'properties.auto.commit.interval.ms'='1000',
'properties.key.serializer'='org.apache.kafka.common.serialization.StringSerializer',
'properties.value.serializer'='org.apache.kafka.common.serialization.StringSerializer',
'properties.security.protocol'='SASL_PLAINTEXT',
'properties.sasl.mechanism'='PLAIN',
'properties.sasl.jaas.config'='org.apache.kafka.common.security.plain.PlainLoginModule required username=\"*****\" password=\"******\";');