using spring boot data redis template get a null pointer error

Question

config:

@Configuration
@EnableCaching
public class RedisConfig extends CachingConfigurerSupport{

    @Bean(name = "template")
    public RedisTemplate<String, Object> template(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(factory);
        Jackson2JsonRedisSerializer<Object> jacksonSeial = new Jackson2JsonRedisSerializer<>(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jacksonSeial.setObjectMapper(om);
        StringRedisSerializer stringSerial = new StringRedisSerializer();
        template.setKeySerializer(stringSerial);
        template.setValueSerializer(jacksonSeial);
        template.setHashKeySerializer(stringSerial);
        template.setHashValueSerializer(jacksonSeial);
        template.afterPropertiesSet();
        return template;
    }

}

use:

@Autowired
    private RedisTemplate<String, Object> template;

and this

  ValueOperations<String, Object> operations = template.opsForValue();

always get a error, warn stack trace is:

java.lang.NullPointerException: null
    at cn.com.agree.afa.jcomponent.CacheOperationImpl.<init>(CacheOperationImpl.java:15) ~[afa-interface-1.0.0.jar:na]
    at tc.bank.base.B_MemaryHandle.getCache(B_MemaryHandle.java:36) ~[afa-component-1.0.0.jar:na]
    at tc.bank.base.B_MemaryHandle.B_PutGlobalCache(B_MemaryHandle.java:64) ~[afa-component-1.0.0.jar:na]
    at tc.bank.base.B_LoadData.B_LoadErrorCodeConfig(B_LoadData.java:146) [afa-component-1.0.0.jar:na]
    at cn.com.agree.afa.trade.AimServer.BASE_startup.execute(BASE_startup.java:53) [main/:na]
    at cn.com.agree.trade.TradeManager.execute(TradeManager.java:43) [afa-interface-1.0.0.jar:na]
    at cn.com.agree.afa.App.run(App.java:71) [main/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:804) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:788) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1309) [spring-boot-2.4.0.jar:2.4.0]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1298) [spring-boot-2.4.0.jar:2.4.0]
    at cn.com.agree.afa.App.main(App.java:40) [main/:na]

I just want to use spring boot date redis to do some CRUD operations like template<String, Object>. please help me

Method invocation 'opsForValue' will produce 'NullPointerException' — Django47
– Django47, Commented Dec 8, 2020 at 3:20

chrylis -cautiouslyoptimistic- · Accepted Answer · 2020-12-08 03:25:14Z

3

Field injection can't happen until after the constructor is already finished. Make the template a constructor parameter instead (and avoid field injection generally).

answered Dec 8, 2020 at 3:25

chrylis -cautiouslyoptimistic-

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5 Comments

Django47 Over a year ago

I can barely understand you, to be frank this is the first time me using spring-related stuff, could you please show me exactly how to correct this?

chrylis -cautiouslyoptimistic- Over a year ago

@Django47 Make the template a parameter on your class's constructor like you would do if you had no Spring in the first place. (And get in the habit of never using @Autowired on fields, because it leads to problems like this; just pass anything you need in the constructor.)

Django47 Over a year ago

I've change my code to

private ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(RedisConfig.class);     @SuppressWarnings("unchecked")     private RedisTemplate<String, Object> redisTemplate = (RedisTemplate<String, Object>) ctx.getBean("redisTemplate");     private ValueOperations<String, Object> operations = redisTemplate.opsForValue();

and got new error

No CacheResolver specified, and no bean of type CacheManager found. Register a CacheManager bean or remove the @EnableCaching annotation from your configuration.

Django47 Over a year ago

after removing @EnableCaching the programe finally runs without error! but I still need to know how the code get the yml or properties metrics

Django47 Over a year ago

fanally using @Value("${spring...}")worked for me...

Karsten Gabriel · Accepted Answer · 2022-03-31 20:21:13Z

0

Adding to chrylis answer here.

Use lombok's @RequiredArgsConstructor on top of your @Component class. It will generate a constructor with the required fields. Redis template will be initialized and null error will go away.

edited Mar 31, 2022 at 20:21

Karsten Gabriel

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answered Mar 30, 2022 at 5:39

Nikhil Rao

334 bronze badges

1 Comment

M. Dudek Over a year ago

Yes, Lombok could help here, but we don't have information about Lombok dependencies in the project.

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