@ Component 
@ Configuration 
Public class RedisConfig {

Public LettuceConnectionFactory lettuceConnectionFactoryTest () {
Return new LettuceConnectionFactory (new RedisStandaloneConfiguration (6379) "127.0.0.1,"); 
} 

Public JedisConnectionFactory jedisConnectionFactoryTest () {
Return new JedisConnectionFactory (new RedisStandaloneConfiguration (6379) "127.0.0.1,"); 
} 

} 

 
The @autowired 
Private RedisConfig RedisConfig; 

The @autowired 
Private StringRedisTemplate redisTemplate; 

@ Test 
Public void test () {

RedisTemplate. SetConnectionFactory (redisConfig lettuceConnectionFactoryTest ());//for lettuce has been submitted to the null pointer exception 
ValueOperations ValueOperations=redisTemplate. OpsForValue (); 
ValueOperations. Set (" test ", "test123"); 
System. The out. Println (valueOperations. Get (" test ")); 

} 

Why only jedisConnectionFactoryTest can pass the test, and has been submitted to the null pointer exception lettuceConnectionFactoryTest? Thank you, really appreciate.
Redis: 3.2.8
Springboot: 2.1.0. RELEASE
Jdk8

 Java. Lang. NullPointerException 
The at org. Springframework. Data. Redis. Connection. Lettuce. LettuceConnectionFactory $SharedConnection. GetNativeConnection (LettuceConnectionFactory. Java: 1085) 
The at org. Springframework. Data. Redis. Connection. Lettuce. LettuceConnectionFactory $SharedConnection. GetConnection (LettuceConnectionFactory. Java: 1065) 
The at org. Springframework. Data. Redis. Connection. Lettuce. LettuceConnectionFactory. GetSharedConnection (LettuceConnectionFactory. Java: 865) 
The at org. Springframework. Data. Redis. Connection. Lettuce. LettuceConnectionFactory. GetConnection (LettuceConnectionFactory. Java: 340) 
The at org. Springframework. Data. Redis. Core. RedisConnectionUtils. DoGetConnection (RedisConnectionUtils. Java: 132) 
The at org. Springframework. Data. Redis. Core. RedisConnectionUtils. GetConnection (RedisConnectionUtils. Java: 95) 
The at org. Springframework. Data. Redis. Core. RedisConnectionUtils. GetConnection (RedisConnectionUtils. Java: 82) 
The at org. Springframework. Data. Redis. Core. RedisTemplate. Execute (RedisTemplate. Java: 211) 
The at org. Springframework. Data. Redis. Core. RedisTemplate. Execute (RedisTemplate. Java: 184) 
The at org. Springframework. Data. Redis. Core. AbstractOperations. Execute (AbstractOperations. Java: 95) 
At org. Springframework. Data. Redis. Core. DefaultValueOperations. Set (236) DefaultValueOperations. Java: 
At com. Test. Proceeds. InfrastructureApplicationTests. Test (InfrastructureApplicationTests. Java: 40) 
At sun. Reflect. NativeMethodAccessorImpl. Invoke0 (Native Method) 
At sun. Reflect. NativeMethodAccessorImpl. Invoke (NativeMethodAccessorImpl. Java: 62) 
At sun. Reflect. DelegatingMethodAccessorImpl. Invoke (43) DelegatingMethodAccessorImpl. Java: 
The at Java. Lang. Reflect. Method. Invoke (498) Method. The Java: 
The at org. Junit. Runners. Model. FrameworkMethod $1. RunReflectiveCall (FrameworkMethod. Java: 50) 
The at org. Junit. Internal. Runners. Model. ReflectiveCallable. Run (ReflectiveCallable. Java: 12) 
The at org. Junit. Runners. Model. FrameworkMethod. InvokeExplosively (FrameworkMethod. Java: 47) 
The at org. Junit. Internal. Runners. Statements. InvokeMethod. Evaluate (InvokeMethod. Java: 17) 
The at org. Springframework. Test. The context. Takeup. Statements. RunBeforeTestExecutionCallbacks. Evaluate (RunBeforeTestExecutionCallbacks. Java: 74) 
The at org. Springframework. Test. The context. Takeup. Statements. RunAfterTestExecutionCallbacks. Evaluate (RunAfterTestExecutionCallbacks. Java: 84) 
The at org. Springframework. Test. The context. Takeup. Statements. RunBeforeTestMethodCallbacks. Evaluate (RunBeforeTestMethodCallbacks. Java: 75) 
The at org. Springframework. Test. The context. Takeup. Statements. RunAfterTestMethodCallbacks. Evaluate (RunAfterTestMethodCallbacks. Java: 86) 
The at org. Springframework. Test. The context. Takeup. Statements. SpringRepeat. Evaluate (SpringRepeat. Java: 84) 
The at org. Junit. Runners. ParentRunner. RunLeaf (ParentRunner. Java: 325) 
The at org. Springframework. Test. The context. Takeup. SpringJUnit4ClassRunner. RunChild (SpringJUnit4ClassRunner. Java: 251) 
The at org. Springframework. Test. The context. Takeup. SpringJUnit4ClassRunner. RunChild (SpringJUnit4ClassRunner. Java: 97) 
The at org. Junit. Runners. ParentRunner $3. The run (ParentRunner. Java: 290) 
The at org. Junit. Runners. ParentRunner $1. The schedule (ParentRunner. Java: 71) 
The at org. Junit. Runners. ParentRunner. RunChildren (ParentRunner. Java: 288) 
The at org. Junit. Runners. ParentRunner. Access the $000 (ParentRunner. Java: 58) 
At org. Junit. Runners. ParentRunner $2. The evaluate (ParentRunner. Java: 268) 
The at org. Springframework. Test. The context. Takeup. Statements. RunBeforeTestClassCallbacks. Evaluate (RunBeforeTestClassCallbacks. Java: 61) 
The at org. Springframework. Test. The context. Takeup. Statements. RunAfterTestClassCallbacks. Evaluate (RunAfterTestClassCallbacks. Java: 70) 
The at org. Junit. Runners. ParentRunner. Run (ParentRunner. Java: 363) 
The at org. Springframework. Test. The context. Takeup. SpringJUnit4ClassRunner. Run (SpringJUnit4ClassRunner. Java: 190) 
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