问在spring-boot中将protobuf作为JSON发送

EN

我正在使用protobufs和这个具体的定义。

message Hash {
    string category = 1;
    repeated KVPair content = 2;
}

message KVPair {
    string key = 1;
    string value = 2;
}

我想将此作为JSON与我的spring-boot应用程序一起发送。我将这个包添加到我的gradle依赖项中：

compile group: 'com.google.protobuf', name: 'protobuf-java', version: '3.6.1'

当我尝试使用以下代码输出Hash生成的对象时：

@RestController
@RequestMapping("/api/crm/")
public class KVController {

    private final KVService kvService;

    public KVController(KVService kvService) {
        this.kvService = kvService;
    }

    @GetMapping("kv/{category}")
    public Hash getHash(@PathVariable String category) {
        Hash hash = kvService.retrieve(category);
        return hash;
    }
}

它抛出了这个终极异常：

数据库由: com.fasterxml.jackson.databind.exc.InvalidDefinitionException:直接自引用导致循环(通过引用链: com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:77) ~jackson-

-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.SerializerProvider.reportBadDefinition(SerializerProvider.java:1191) ~jackson--2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.BeanPropertyWriter._handleSelfReference(BeanPropertyWriter.java:944) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:721) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.数据库(BeanSerializerBase.java:719) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider._serialize(DefaultSerializerProvider.java:480) ~jackson-serializeFields-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind。ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:319) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ObjectWriter$Prefetch.serialize(ObjectWriter.java:1396) ~jackson-databind-2.9.6.jar:2.9.6 at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:913) ~jackson-databind-2.9.6.jar:2.9.6 at org.springframework.http.converter.json

kvService只从redis返回数据。它将散列数据类型(https://redis.io/topics/data-types)解析为proto中定义的散列对象。我不能显示所有的源代码，因为它调用其他系统，并且源代码非常长。

我的build.gradle中的重要依赖项：

def versions = [
        logback: '1.2.3',
        owner: '1.0.10',
        jackson: '2.9.6',

        guava: '25.1-jre',
        guice: '4.2.0',
        grpc: '1.9.1',
        protoc: '3.5.1',

        redis: '2.9.0',
]

依赖关系{

compile group: 'ch.qos.logback', name: 'logback-classic', version: versions.logback
compile group: 'org.aeonbits.owner', name: 'owner', version: versions.owner

compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: versions.jackson
compile group: 'com.fasterxml.jackson.core', name: 'jackson-annotations', version: versions.jackson
compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: versions.jackson

compile group: 'com.google.guava', name: 'guava', version: versions.guava
compile group: 'com.google.inject', name: 'guice', version: versions.guice
compile group: 'io.grpc', name: 'grpc-netty', version: versions.grpc
compile group: 'io.grpc', name: 'grpc-protobuf', version: versions.grpc
compile group: 'io.grpc', name: 'grpc-stub', version: versions.grpc
compile 'org.glassfish:javax.annotation:10.0-b28'


compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.1'
compile group: 'javax.activation', name: 'activation', version: '1.1.1'

compile group: 'redis.clients', name: 'jedis', version: versions.redis

}

正如你在我的protobuf定义中看到的，它并不是自引用的。

有没有可能解决这个问题的方法？