使用 MongoDB 错误 com.mongodb.util.JSONParseException(uPDATED) 在 SpringBoot 中自定义 @Query
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【中文标题】使用 MongoDB 错误 com.mongodb.util.JSONParseException(uPDATED) 在 SpringBoot 中自定义 @Query【英文标题】：Custom @Query in SpringBoot using MongoDB error com.mongodb.util.JSONParseException(uPDATED) 【发布时间】：2019-07-05 21:44:22 【问题描述】：在 Java 中使用 MongoDB
请注意，这个自定义查询只是为了看看它是如何工作的，所以请不要告诉我在 hibernate 中有替代品（我已经知道了，我只想运行它）
错误
Exception in thread "main" java.lang.NullPointerException
at repository.serviceclass.getjsondatamongo(serviceclass.java:25)
at springbootwebsocketexample.SpringBootWebsocketExampleApplication.main(SpringBootWebsocketExampleApplication.java:58)
对于您的帮助 (serviceclass.java:25) ==
return userrep2.obj1();SpringBootWebsocketExampleApplication.java:58===JSONObject jsOn1=cc1.getjsondatamongo();这是我的存储库.UserRepository.java
package repository;
import java.util.ArrayList;
import java.util.*;
import org.json.*;
//import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.repository.*;
import com.mongodb.connection.*;
import document.Users;
public interface UserRepository extends MongoRepository<Users,Integer>
@Query("db.users.find()")
JSONObject obj1();
这是我的 repository.serviceclass
package repository;
import java.util.*;
import org.json.*;
import org.springframework.beans.factory.annotation.*;
import org.springframework.stereotype.*;
import document.*;
@Service
public class serviceclass
@Autowired
UserRepository userrep2;
public JSONObject getjsondatamongo()
return userrep2.obj1();
这是我的 SpringBootWebsocketExampleApplication.java
package springbootwebsocketexample;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.*;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.*;
import org.springframework.context.annotation.*;
import org.springframework.context.annotation.*;
import org.springframework.stereotype.*;
import repository.*;
import document.Users;
import repository.*;
import java.awt.*;
import java.util.*;
import java.util.List;
import org.json.*;
@SpringBootApplication
@ComponentScan(basePackages= "resource")
@ComponentScan(basePackages= "document")
@ComponentScan(basePackages= "repository")
@ComponentScan(basePackages= "config")
public class SpringBootWebsocketExampleApplication implements CommandLineRunner
@Autowired
public serviceclass cc1 ;
public static void main(String[] args)
SpringApplication.run(SpringBootWebsocketExampleApplication.class, args);
@Override
public void run(String... args) throws Exception
List<Users> kk=new ArrayList<Users>();
JSONObject jsOn1=cc1.getjsondatamongo();
System.out.println(jsOn1);
更新 我已经更新了上面的 SpringBootWebsocketExampleApplication.java 新错误 = 引起：com.mongodb.util.JSONParseException: db.users.find()
15:45:36.951 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : []
15:45:36.954 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-starter/target/classes/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot/target/classes/, /spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/]
15:45:36.954 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/C:/Users/vaibhav.chhabra/Documents/workspace-sts-3.9.7.RELEASE/DB_Mongo_exapme_name/target/classes/]
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.10.RELEASE)
2019-02-12 15:45:37.110 INFO 3048 --- [ restartedMain] s.SpringBootWebsocketExampleApplication : Starting SpringBootWebsocketExampleApplication on VNL-VaibhavC with PID 3048 (C:\Users\vaibhav.chhabra\Documents\workspace-sts-3.9.7.RELEASE\DB_Mongo_exapme_name\target\classes started by vaibhav.chhabra in C:\Users\vaibhav.chhabra\Documents\workspace-sts-3.9.7.RELEASE\DB_Mongo_exapme_name)
2019-02-12 15:45:37.110 INFO 3048 --- [ restartedMain] s.SpringBootWebsocketExampleApplication : No active profile set, falling back to default profiles: default
2019-02-12 15:45:37.150 INFO 3048 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@1599273b: startup date [Tue Feb 12 15:45:37 IST 2019]; root of context hierarchy
2019-02-12 15:45:38.032 INFO 3048 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2019-02-12 15:45:38.038 INFO 3048 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-02-12 15:45:38.039 INFO 3048 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.27
2019-02-12 15:45:38.089 INFO 3048 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-02-12 15:45:38.089 INFO 3048 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 941 ms
2019-02-12 15:45:38.183 INFO 3048 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2019-02-12 15:45:38.185 INFO 3048 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-02-12 15:45:38.186 INFO 3048 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-02-12 15:45:38.186 INFO 3048 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-02-12 15:45:38.186 INFO 3048 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2019-02-12 15:45:38.448 INFO 3048 --- [ restartedMain] org.mongodb.driver.cluster : Cluster created with settings hosts=[localhost:27017], mode=MULTIPLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500
2019-02-12 15:45:38.448 INFO 3048 --- [ restartedMain] org.mongodb.driver.cluster : Adding discovered server localhost:27017 to client view of cluster
2019-02-12 15:45:38.489 INFO 3048 --- [localhost:27017] org.mongodb.driver.connection : Opened connection [connectionIdlocalValue:1, serverValue:225] to localhost:27017
2019-02-12 15:45:38.490 INFO 3048 --- [localhost:27017] org.mongodb.driver.cluster : Monitor thread successfully connected to server with description ServerDescriptionaddress=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, version=ServerVersionversionList=[4, 0, 5], minWireVersion=0, maxWireVersion=7, maxDocumentSize=16777216, roundTripTimeNanos=459434
2019-02-12 15:45:38.491 INFO 3048 --- [localhost:27017] org.mongodb.driver.cluster : Discovered cluster type of STANDALONE
2019-02-12 15:45:38.622 WARN 3048 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'springBootWebsocketExampleApplication': Unsatisfied dependency expressed through field 'cc1'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'serviceclass': Unsatisfied dependency expressed through field 'userrep2'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is com.mongodb.util.JSONParseException:
db
^
2019-02-12 15:45:38.626 INFO 3048 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2019-02-12 15:45:38.634 INFO 3048 --- [ restartedMain] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2019-02-12 15:45:38.641 ERROR 3048 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'springBootWebsocketExampleApplication': Unsatisfied dependency expressed through field 'cc1'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'serviceclass': Unsatisfied dependency expressed through field 'userrep2'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is com.mongodb.util.JSONParseException:
db
^
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE]
at springbootwebsocketexample.SpringBootWebsocketExampleApplication.main(SpringBootWebsocketExampleApplication.java:65) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_201]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_201]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_201]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_201]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.10.RELEASE.jar:1.5.10.RELEASE]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'serviceclass': Unsatisfied dependency expressed through field 'userrep2'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is com.mongodb.util.JSONParseException:
db
^
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
... 24 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userRepository': Invocation of init method failed; nested exception is com.mongodb.util.JSONParseException:
db
^
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
... 37 common frames omitted
Caused by: com.mongodb.util.JSONParseException:
db
^
at com.mongodb.util.JSONParser.parse(JSON.java:230) ~[mongodb-driver-3.4.3.jar:na]
at com.mongodb.util.JSONParser.parse(JSON.java:155) ~[mongodb-driver-3.4.3.jar:na]
at com.mongodb.util.JSON.parse(JSON.java:92) ~[mongodb-driver-3.4.3.jar:na]
at com.mongodb.util.JSON.parse(JSON.java:73) ~[mongodb-driver-3.4.3.jar:na]
at org.springframework.data.mongodb.repository.query.StringBasedMongoQuery$ParameterBindingParser.parseAndCollectParameterBindingsFromQueryIntoBindings(StringBasedMongoQuery.java:230) ~[spring-data-mongodb-1.10.10.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.query.StringBasedMongoQuery.<init>(StringBasedMongoQuery.java:93) ~[spring-data-mongodb-1.10.10.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.query.StringBasedMongoQuery.<init>(StringBasedMongoQuery.java:72) ~[spring-data-mongodb-1.10.10.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.support.MongoRepositoryFactory$MongoQueryLookupStrategy.resolveQuery(MongoRepositoryFactory.java:169) ~[spring-data-mongodb-1.10.10.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:449) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:222) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:277) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:263) ~[spring-data-commons-1.13.10.RELEASE.jar:na]
at org.springframework.data.mongodb.repository.support.MongoRepositoryFactoryBean.afterPropertiesSet(MongoRepositoryFactoryBean.java:117) ~[spring-data-mongodb-1.10.10.RELEASE.jar:na]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.14.RELEASE.jar:4.3.14.RELEASE]
... 47 common frames omitted
【问题讨论】：
@Pijotrek 我做了他们两个仍然没有效果 我删除了我的评论并给出了答案，请尝试并告诉它是否有效 【参考方案1】：使用@Repository 注释您的存储库类。
另外，不要这样做：
ServiceClass cc1 = new ServiceClass();
相反，这应该注入@Autowired 注解让Spring框架完成它的工作，像这样：
public class SpringBootWebsocketExampleApplication implements CommandLineRunner
@Autowired
private ServiceClass serviceClass;
public static void main(String[] args)
SpringApplication.run(SpringBootWebsocketExampleApplication.class, args);
@Override
public void run(String... args) throws Exception
List<Users> kk=new ArrayList<Users>();
JSONObject jsOn1=cc1.getjsondatamongo();
System.out.println(jsOn1);
这是春天的方法。补充阅读：https://www.baeldung.com/inversion-control-and-dependency-injection-in-spring
还有一点建议：遵循命名约定/标准。类应以大写字母命名，驼峰式命名，即UserRepository、UserService
第二部分：
假设您的新/当前异常。我认为将查询结果解析为JSONObject 存在问题。我不确定这一点，但通常你想返回 POJO 列表，即：List<User>。
此外，您也可以使用“内置”方法，例如 findAll() - 此处无需使用 native query。试试这个：
@Service
public class ServiceClass
@Autowired
UserRepository userRepository;
public JSONObject getjsondatamongo()
return userRepository.findAll();
第三部分
通过一些互联网教程和阅读文档，我认为您应该简单地省略 db.collection.find() 并在您的 @Query 中提供 。像@Query("") 一样，如果你想返回整个数据。
【讨论】：
在主类中不允许注释，不知道为什么会这样，它说“该位置不允许注释@Autowired” 你确定你在正确的地方使用它吗？它应该用于字段，而不是在 main 方法中。 org.springframework.beans.factory.UnsatisfiedDependencyException：创建名为“springBootWebsocketExampleApplication”的bean时出错：通过字段“cc1”表示的依赖项不满足；嵌套异常是 org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为“serviceclass”的 bean 时出错：通过字段“userrep2”表示不满足的依赖关系；嵌套异常是 org.springframework.beans.factory.BeanCreationException: 创建名为 'userRepository' 的 bean 时出错：调用 init 方法失败；嵌套异常是 com.mongodb.util.JSONParseException: db.users.find() 好的，还有一个问题，但我们离我们更近了 1 步。你能用当前的堆栈跟踪编辑你的帖子吗？以上是关于使用 MongoDB 错误 com.mongodb.util.JSONParseException(uPDATED) 在 SpringBoot 中自定义 @Query的主要内容，如果未能解决你的问题，请参考以下文章
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