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问题：

如何在序列化W/Spring数据Redis时正确地忽略类成员？

咸亦
2023-03-14

我希望有人能提供帮助，因为我真的不知道如何解决以下问题：我希望用Spring Data RedisineCrudRepository序列化Entity和ThumbnailurlEntity（请参见下面的代码）的一些对象。因为类中有我不想序列化的成员，所以我尝试以各种方式忽略它们，使用@jsonignoreproperties注释类本身，或者使用@jsonignore注释相应的成员/属性，或者使用redisconfig.java中的customconversion注释filters注释相应的成员/属性。

现在的问题是，无论我尝试哪种忽略方式，我总是得到相同的错误org.springframework.data.keyvalue.core.uncategorizedKeyValueException：property的路径不能为null或空；嵌套异常是java.lang.IllegalArgumentException：当我试图保存相应的对象时，Path to property不能为null或空。。（有关更多细节，请参见下面的Stacktrace）

我甚至在那些课上用Mixin的试过，但效果不太好...

那么问题是：当用spring-data-redis序列化某个类的对象时，如何正确地忽略属性呢？

@EqualsAndHashCode(exclude = "domainObject")
@ToString(exclude = "domainObject")
@NoArgsConstructor
//@JsonIgnoreProperties("domainObject")
@JsonFilter("myEntityFilter")
public abstract class Entity<T extends DomainObject> {
    @TimeToLive
    protected final static long TIME_TO_LIVE = 60 * 60 * 24;

    @Id
    @Indexed
    private String id;

//    @Transient
//    @JsonIgnore
    private T domainObject;

    public Entity(@NotNull T domainObject) {
        this.domainObject = domainObject;
    }

    public abstract Entity<T> createFromDomainObject(@NotNull T domainObject);

    public abstract void updateFromDomainObject(T domainObject);

    public void updateFromDomainObject() {
        this.updateFromDomainObject(this.getDomainObject());
    }

    public String getId() {
        return id;
    }

//    @Transient
//    @JsonIgnore
    public T getDomainObject() {
        return domainObject;
    }

    public void setDomainObject(T domainObject) {
        this.domainObject = domainObject;
    }
}

@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode(callSuper = false, exclude = "parentList")
@ToString(exclude = "parentList")
@RedisHash("thumbnail_url_entity")
//@JsonIgnoreProperties("parentList")
@JsonFilter("myThumbnailUrlEntityFilter")
public class ThumbnailUrlEntity extends Entity<ThumbnailUrl> {

    @Indexed
    private String url;

    private Integer priority;

//    @Transient
//    @JsonIgnore
    private ThumbnailUrlListEntity parentList;

    public ThumbnailUrlEntity(@NotNull ThumbnailUrl domainObject) {
        super(domainObject);
        this.updateFromDomainObject(domainObject);
    }

    @Override
    public Entity<ThumbnailUrl> createFromDomainObject(@NotNull ThumbnailUrl domainObject) {
        ThumbnailUrlEntity entity = new ThumbnailUrlEntity();
        entity.url = domainObject.getUrl();
        entity.priority = domainObject.getPriority();
        return entity;
    }

    @Override
    public void updateFromDomainObject(@NotNull ThumbnailUrl domainObject) {
        this.url = domainObject.getUrl();
        this.priority = domainObject.getPriority();
    }

    public String getUrl() {
        return url;
    }

    public Integer getPriority() {
        return priority;
    }

    public void setPriority(Integer priority) {
        this.priority = priority;
    }

//    @Transient
//    @JsonIgnore
    public ThumbnailUrlListEntity getParentList() {
        return parentList;
    }

    public void setParentList(ThumbnailUrlListEntity parentList) {
        this.parentList = parentList;
    }
}

@Configuration
@EnableRedisRepositories(basePackages = "nlp.floschne.thumbnailAnnotator.db")
public class RedisConfig {

    @Bean
    RedisConnectionFactory connectionFactory() {
        return new LettuceConnectionFactory();
    }

    @Bean
    RedisTemplate<?, ?> redisTemplate(RedisConnectionFactory connectionFactory) {

        RedisTemplate<String, byte[]> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        template.setKeySerializer(new StringRedisSerializer());

        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
        mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
        mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);


        SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("domainObject");
        FilterProvider filters = new SimpleFilterProvider()
                .addFilter("myEntityFilter", theFilter)
                .addFilter("myThumbnailUrlEntityFilter", theFilter);

        mapper.setFilters(filters);


        template.setValueSerializer(new GenericJackson2JsonRedisSerializer(mapper));

        return template;
    }

    @Bean
    public RedisCustomConversions redisCustomConversions() {
        return new RedisCustomConversions(Arrays.asList(
                new EntityToBytesConverter(),
                new BytesToEntityConverter(),
                new ThumbnailUrlEntityToBytesConverter(),
                new BytesToThumbnailUrlEntityConverter()));
    }

    @WritingConverter
    public class EntityToBytesConverter implements Converter<Entity<?>, byte[]> {

        private final GenericJackson2JsonRedisSerializer serializer;

        public EntityToBytesConverter() {
            ObjectMapper mapper = new ObjectMapper();
            mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);

            SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("domainObject");
            FilterProvider filters = new SimpleFilterProvider().addFilter("myEntityFilter", theFilter);

            mapper.setFilters(filters);

            serializer = new GenericJackson2JsonRedisSerializer(mapper);
        }

        @Override
        public byte[] convert(Entity value) {
            return serializer.serialize(value);
        }
    }

    @ReadingConverter
    public class BytesToEntityConverter implements Converter<byte[], Entity<?>> {

        private final GenericJackson2JsonRedisSerializer serializer;

        public BytesToEntityConverter() {
            ObjectMapper mapper = new ObjectMapper();
            mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);


            SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("domainObject");
            FilterProvider filters = new SimpleFilterProvider().addFilter("myEntityFilter", theFilter);

            mapper.setFilters(filters);

            serializer = new GenericJackson2JsonRedisSerializer(mapper);
        }

        @Override
        public Entity convert(byte[] value) {
            return (Entity) serializer.deserialize(value);
        }
    }

    @WritingConverter
    public class ThumbnailUrlEntityToBytesConverter implements Converter<ThumbnailUrlEntity, byte[]> {

        private final GenericJackson2JsonRedisSerializer serializer;

        public ThumbnailUrlEntityToBytesConverter() {
            ObjectMapper mapper = new ObjectMapper();
            mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);

            SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("parentList");
            FilterProvider filters = new SimpleFilterProvider().addFilter("myThumbnailUrlEntityFilter", theFilter);

            mapper.setFilters(filters);

            serializer = new GenericJackson2JsonRedisSerializer(mapper);
        }

        @Override
        public byte[] convert(ThumbnailUrlEntity value) {
            return serializer.serialize(value);
        }
    }

    @ReadingConverter
    public class BytesToThumbnailUrlEntityConverter implements Converter<byte[], ThumbnailUrlEntity> {

        private final GenericJackson2JsonRedisSerializer serializer;

        public BytesToThumbnailUrlEntityConverter() {
            ObjectMapper mapper = new ObjectMapper();
            mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
            mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);


            SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("parentList");
            FilterProvider filters = new SimpleFilterProvider().addFilter("myThumbnailUrlEntityFilter", theFilter);

            mapper.setFilters(filters);

            serializer = new GenericJackson2JsonRedisSerializer(mapper);
        }

        @Override
        public ThumbnailUrlEntity convert(byte[] value) {
            return (ThumbnailUrlEntity) serializer.deserialize(value);
        }
    }
}

public interface ThumbnailUrlEntityRepository extends CrudRepository<ThumbnailUrlEntity, String> {
}

org.springframework.data.keyvalue.core.UncategorizedKeyValueException: Path to property must not be null or empty.; nested exception is java.lang.IllegalArgumentException: Path to property must not be null or empty.

    at org.springframework.data.keyvalue.core.KeyValuePersistenceExceptionTranslator.translateExceptionIfPossible(KeyValuePersistenceExceptionTranslator.java:55)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.resolveExceptionIfPossible(KeyValueTemplate.java:459)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.execute(KeyValueTemplate.java:345)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:158)
    at org.springframework.data.redis.core.RedisKeyValueTemplate.insert(RedisKeyValueTemplate.java:125)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.insert(KeyValueTemplate.java:140)
    at org.springframework.data.keyvalue.repository.support.SimpleKeyValueRepository.save(SimpleKeyValueRepository.java:101)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:377)
    at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:200)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:629)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:593)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:578)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
    at com.sun.proxy.$Proxy43.save(Unknown Source)
    at nlp.floschne.thumbnailAnnotator.db.repository.ThumbnailUrlEntityRepositoryTests.whenSaving_thenAvailableOnRetrieval(ThumbnailUrlEntityRepositoryTests.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    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:73)
    at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    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.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
    at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
    at org.junit.rules.RunRules.evaluate(RunRules.java:20)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalArgumentException: Path to property must not be null or empty.
    at org.springframework.util.Assert.hasText(Assert.java:276)
    at org.springframework.data.redis.core.convert.Bucket.put(Bucket.java:72)
    at org.springframework.data.redis.core.convert.MappingRedisConverter.writeToBucket(MappingRedisConverter.java:750)
    at org.springframework.data.redis.core.convert.MappingRedisConverter.writeInternal(MappingRedisConverter.java:571)
    at org.springframework.data.redis.core.convert.MappingRedisConverter.write(MappingRedisConverter.java:396)
    at org.springframework.data.redis.core.convert.MappingRedisConverter.write(MappingRedisConverter.java:122)
    at org.springframework.data.redis.core.RedisKeyValueAdapter.put(RedisKeyValueAdapter.java:208)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.lambda$insert$0(KeyValueTemplate.java:165)
    at org.springframework.data.keyvalue.core.KeyValueTemplate.execute(KeyValueTemplate.java:343)
    ... 58 more

entityJsonSerializer.java

 public class EntityJsonSerializer implements RedisSerializer<Entity> {

        private final ObjectMapper mapper;

        public EntityJsonSerializer() {
            this.mapper = new ObjectMapper();
            this.mapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL, JsonTypeInfo.As.PROPERTY);
            this.mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
            this.mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
            this.mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_NULL);
            this.mapper.setDefaultPropertyInclusion(JsonInclude.Include.NON_EMPTY);


            SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept("domainObject", "parentList");

            FilterProvider filters = new SimpleFilterProvider()
                    .addFilter("myEntityFilter", theFilter)
                    .addFilter("myThumbnailUrlEntityFilter", theFilter);

            this.mapper.setFilters(filters);
        }

        public EntityJsonSerializer(ObjectMapper mapper) {
            this.mapper = mapper;
        }

        @Override
        public byte[] serialize(Entity t) throws SerializationException {
            try {
                return mapper.writeValueAsBytes(t);
            } catch (JsonProcessingException e) {
                throw new SerializationException(e.getMessage(), e);
            }
        }

        @Override
        public Entity deserialize(byte[] bytes) throws SerializationException {

            if (bytes == null) {
                return null;
            }

            try {
                return mapper.readValue(bytes, Entity.class);
            } catch (Exception e) {
                throw new SerializationException(e.getMessage(), e);
            }
        }
    }

更新的redisconfig.java

@Configuration
@EnableRedisRepositories(basePackages = "nlp.floschne.thumbnailAnnotator.db")
public class RedisConfig {

    @Bean
    RedisConnectionFactory connectionFactory() {
        return new LettuceConnectionFactory();
    }

    @Bean
    RedisTemplate<?, ?> redisTemplate(RedisConnectionFactory connectionFactory) {

        RedisTemplate<String, byte[]> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);
        template.setKeySerializer(new StringRedisSerializer());

        template.setValueSerializer(new EntityJsonSerializer());

        return template;
    }

    @Bean
    public RedisCustomConversions redisCustomConversions() {
        return new RedisCustomConversions(Arrays.asList(
                new EntityToBytesConverter(),
                new BytesToEntityConverter(),
                new ThumbnailUrlEntityToBytesConverter(),
                new BytesToThumbnailUrlEntityConverter()));
    }

    @WritingConverter
    public class EntityToBytesConverter implements Converter<Entity<?>, byte[]> {

        private final EntityJsonSerializer serializer;

        public EntityToBytesConverter() {
            serializer = new EntityJsonSerializer();
        }

        @Override
        public byte[] convert(Entity value) {
            return serializer.serialize(value);
        }
    }

    @ReadingConverter
    public class BytesToEntityConverter implements Converter<byte[], Entity<?>> {

        private final EntityJsonSerializer serializer;

        public BytesToEntityConverter() {
            serializer = new EntityJsonSerializer();
        }

        @Override
        public Entity convert(byte[] value) {
            return (Entity) serializer.deserialize(value);
        }
    }

    @WritingConverter
    public class ThumbnailUrlEntityToBytesConverter implements Converter<ThumbnailUrlEntity, byte[]> {

        private final EntityJsonSerializer serializer;

        public ThumbnailUrlEntityToBytesConverter() {
            serializer = new EntityJsonSerializer();
        }

        @Override
        public byte[] convert(ThumbnailUrlEntity value) {
            return serializer.serialize(value);
        }
    }

    @ReadingConverter
    public class BytesToThumbnailUrlEntityConverter implements Converter<byte[], ThumbnailUrlEntity> {

        private final EntityJsonSerializer serializer;

        public BytesToThumbnailUrlEntityConverter() {
            serializer = new EntityJsonSerializer();
        }

        @Override
        public ThumbnailUrlEntity convert(byte[] value) {
            return (ThumbnailUrlEntity) serializer.deserialize(value);
        }
    }
}

共有1个答案

巢星纬
2023-03-14

我认为你可以做以下其中之一：

首先，你可以尝试得到当前版本的工作，这似乎并不容易。

您是否为Redis配置了正确的序列化程序？在链接上有这样的答案：

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