RedisTemplate multi thread not work, why and how to fix? - spring

Question

I want to use RedisTemplate, more specific StringRedisTemplate in Junit used with multi thread, but it fails. And if I use only test thread, it work. Why? Isn't StringRedisTemplate thread safe? How to fix that?
#Test
void multiThreadStringRedisTemplate(#Autowired RedisConnectionFactory redisConnectionFactory){
Runnable runnable = () -> {
StringRedisTemplate stringRedisTemplate = new StringRedisTemplate(redisConnectionFactory);
for(int i = 0;i < 50;++i){
String value = stringRedisTemplate.opsForValue().get("ok");
System.out.println(i + ":" + value);
}
};
// multi thread not work
ExecutorService executorService = Executors.newCachedThreadPool();
for(int i = 0;i < 1;++i){
executorService.execute(runnable);
}
// runnable.run(); this work fine
}
I try to use spring's RedisTemplate in multi thread, but not work. The test process just exit with 0 without any exception info.
pom's dependency and properties.yml as:
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<exclusions>
<exclusion>
<artifactId>lettuce-core</artifactId>
<groupId>io.lettuce</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
</dependency>
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
</dependency>
</dependencies>
I've enabled the connection poll with default configuration.
spring:
redis:
host: ${romote_host}
port: 6379
password: ${password}
database: 0
connect-timeout: 3000ms
jedis:
pool:
enabled: true

Answer 1

You need to wait for other threads in your executor service to do their work. I think adding this snippet at the end of your test would suffice
taskExecutor.shutdown();
try {
taskExecutor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
...
}