Serialization Error when reading value with RedisTemplate and GenericJackson2RedisSerializer - redis

Question

I am trying a very basic example of Spring Data Redis, where I want to store a User object in Redis and then return it:
#Data
#AllArgsConstructor
#NoArgsConstructor
#Builder
class BasicUser {
private String name;
private String surname;
private String emailAddress;
private Integer age;
}
#Test
public void storeUserInRedisWithRedisTemplateTest() {
BasicUser user = BasicUser
.builder()
.age(22)
.name("testuser")
.surname("testsurname")
.emailAddress("address#address.com")
.build();
redisTemplate.opsForValue().set("userWithTemplate", user, 10800);
BasicUser returnedUser = (BasicUser) redisTemplate.opsForValue().get("userWithTemplate");
assertThat(returnedUser.emailAddress, is(user.emailAddress));
}
The error is:
org.springframework.data.redis.serializer.SerializationException: Could not read JSON: Invalid UTF-32 character 0x7b214063 (above 0x0010ffff) at char #2700, byte #10803); nested exception is java.io.CharConversionException: Invalid UTF-32 character 0x7b214063 (above 0x0010ffff) at char #2700, byte #10803)
at org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer.deserialize(GenericJackson2JsonRedisSerializer.java:152)
at org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer.deserialize(GenericJackson2JsonRedisSerializer.java:130)
at org.springframework.data.redis.core.AbstractOperations.deserializeValue(AbstractOperations.java:335)
at org.springframework.data.redis.core.AbstractOperations$ValueDeserializingRedisCallback.doInRedis(AbstractOperations.java:61)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:228)
at org.springframework.data.redis.core.RedisTemplate.execute(RedisTemplate.java:188)
at org.springframework.data.redis.core.AbstractOperations.execute(AbstractOperations.java:96)
at org.springframework.data.redis.core.DefaultValueOperations.get(DefaultValueOperations.java:53)
at com.kuluvalley.guru.server.service.UserSessionCacheServiceTest.storeUserInRedisWithRedisTemplateTest(UserSessionCacheServiceTest.java:123)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
Caused by: java.io.CharConversionException: Invalid UTF-32 character 0x7b214063 (above 0x0010ffff) at char #2700, byte #10803)
at com.fasterxml.jackson.core.io.UTF32Reader.reportInvalid(UTF32Reader.java:195)
at com.fasterxml.jackson.core.io.UTF32Reader.read(UTF32Reader.java:158)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._loadMore(ReaderBasedJsonParser.java:250)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser._skipWSOrEnd(ReaderBasedJsonParser.java:2354)
at com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:672)
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4340)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4189)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3266)
at org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer.deserialize(GenericJackson2JsonRedisSerializer.java:150)
... 40 more
In Redis, the value looks like:
[MANY MORE 0x00]
\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00{\"#class\":\"com.org.BasicUser\",\"name\":\"testuser\",\"surname\":\"testsurname\",\"emailAddress\":\"address#address.com\",\"age\":22}"
The relevant Redis Configuration is as follows:
#Configuration
public class RedisConfig {
#Bean
public RedisConnectionFactory redisConnectionFactory(Environment env) {
RedisStandaloneConfiguration configuration = new RedisStandaloneConfiguration();
configuration.setHostName(env.getRequiredProperty("redis.hostname"));
configuration.setPort(env.getProperty("redis.port", Integer.class, 6379));
return new LettuceConnectionFactory(configuration);
}
#Bean
public StringRedisTemplate redisTemplate(Environment env) {
StringRedisTemplate template = new StringRedisTemplate();
template.setConnectionFactory(redisConnectionFactory(env));
template.setKeySerializer(new StringRedisSerializer());
template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
return template;
}
}
I would expect this to just work as I am reading and writing the same data. Also the amount 0x00 is worrying. Is it best practice using Strings as values? What am I missing?

Answer 1

Basically, because you are using the wrong api not expected:
void set(K key, V value, long offset);
You should use:
void set(K key, V value, long timeout, TimeUnit unit);
with code:
redisTemplate.opsForValue().set("userWithTemplate", user, 10800, TimeUnit.SECONDS);