我是Spring的新手，所以我指的是有关Spring Boot的一些实时项目教程。他们通过使用JFreeChart创建饼图。因此，每当我在主代码中包含饼图代码时，我的程序就会遇到错误，因此在开发它时会遇到问题。 如果我的程序中未包含饼图代码，则我的程序运行良好。 如果我删除存储库类中的代码，我的代码可以正常运行。请帮帮我。
错误
main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.5.Final}
2018-09-16 18:28:04.591 INFO 6860 --- [ main]
org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-09-16 18:28:04.761 INFO 6860 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2018-09-16 18:28:04.905 INFO 6860 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2018-09-16 18:28:05.512 INFO 6860 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-09-16 18:28:05.817 INFO 6860 --- [ main] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
2018-09-16 18:28:05.862 WARN 6860 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'locationController': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'LocationService': Unsatisfied dependency expressed through field 'locationRepos'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'locationRepos': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.project.abhishek.location.repos.LocationRepos.findTypeAndTypeCount()!
2018-09-16 18:28:05.862 INFO 6860 --- [ main] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2018-09-16 18:28:05.862 INFO 6860 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2018-09-16 18:28:05.867 INFO 6860 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2018-09-16 18:28:05.872 INFO 6860 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2018-09-16 18:28:05.887 INFO 6860 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-09-16 18:28:05.897 ERROR 6860 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'locationController': Unsatisfied dependency expressed through field 'service'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'LocationService': Unsatisfied dependency expressed through field 'locationRepos'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'locationRepos': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Validation failed for query for method public abstract java.util.List com.project.abhishek.location.repos.LocationRepos.findTypeAndTypeCount()!
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:376) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1376) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:829) ~[spring-beans-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:865) ~[spring-context-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:548) ~[spring-context-5.1.0.RC2.jar:5.1.0.RC2]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.1.0.M2.jar:2.1.0.M2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:785) [spring-boot-2.1.0.M2.jar:2.1.0.M2]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:418) [spring-boot-2.1.0.M2.jar:2.1.0.M2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:337) [spring-boot-2.1.0.M2.jar:2.1.0.M2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1269) [spring-boot-2.1.0.M2.jar:2.1.0.M2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1257) [spring-boot-2.1.0.M2.jar:2.1.0.M2]
at com.project.abhishek.location.StudentApplication.main(StudentApplication.java:16) [classes/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'LocationService': Unsatisfied dependency
应用程序类
@SpringBootApplication
@ComponentScan("com.project.abhishek.location")
public class StudentApplication {
public static void main(String[] args) {
SpringApplication.run(StudentApplication.class, args);
}}
存储库类
public interface LocationRepos extends JpaRepository<Location, Integer> {
@Query("select type,count(type) from location group by type")
public List<Object[]> findTypeAndTypeCount();
}
控制器
@Controller
public class LocationController {
@Autowired
private LocationService service;
@RequestMapping("/saveLoc")
public String saveLocation(@ModelAttribute("location") Location location, ModelMap modelMap) {
Location locationSaved = getService().saveLocation(location);
String msg = "Location save with id:" +locationSaved.getId();
modelMap.addAttribute("msg", msg);
return "createLocation";
}
@RequestMapping("/displayLocation")
public String displayLocation(ModelMap modelMap) {
List<Location> locations = service.getAllLocation();
modelMap.addAttribute("locations", locations);
return "displayLocation";
}
@RequestMapping("/deleteLocation")
public String deleteLocation(@RequestParam("id")int id,ModelMap modelMap ) {
Location location = new Location();
location.setId(id);
service.deleteLocation(location);
List<Location> locations = service.getAllLocation();
modelMap.addAttribute("locations", locations);
return "displayLocation";
}
@RequestMapping("/generateReport")
public String generateReport() {
String path =context.getRealPath("/");
List<Object[]> data = locationRepos.findTypeAndTypeCount();
reportUtill.generatePieChart(path, data);
return "report";
}
public LocationService getService() {
return service;
}
public void setService(LocationService service) {
this.service = service;
}
服务等级
@Service
public class LocationServiceImpl implements LocationService {
@Autowired
private LocationRepos locationRepos;
@Override
public Location saveLocation(Location location) {
return locationRepos.save(location);
}
@Override
public Location updateLocation(Location location) {
return locationRepos.save(location);
}
@Override
public void deleteLocation(Location location) {
locationRepos.delete(location);
}
@Override
public Location getLocation(int id) {
Optional<Location> optional = locationRepos.findById(id);
Location location = optional.get();
return location;
}
@Override
public List<Location> getAllLocation() {
return locationRepos.findAll();
}
public LocationRepos getLocationRepos() {
return locationRepos;
}
public void setLocationRepos(LocationRepos locationRepos) {
this.locationRepos = locationRepos;
}
}
实体
@Entity
public class Location {
@Id
private int id;
private String code;
private String name;
private String type;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
@Override
public String toString() {
return "Location [id=" + id + ", code=" + code + ", name=" + name + ", type=" + type + "]";
}
ReportUtil类
@Component
public class ReportUtilImpl implements ReportUtil {
@Override
public void generatePieChart(String path, List<Object[]> data) {
DefaultPieDataset dataset= new DefaultPieDataset();
for (Object[] object : data) {
dataset.setValue(object[0].toString(), new Double(object[1].toString()));
}
JFreeChart chart = ChartFactory.createPieChart3D("Location Type report", dataset, true, true, false);
try {
ChartUtilities.saveChartAsJPEG(new File(path+"/pieChart.jpeg"), chart, 300, 300);
} catch (IOException e) {
e.printStackTrace();
}
}
}
我的包裹结构
com.project.abhishek.location---application classs
com.project.abhishek.location.controller---controller class
com.project.abhishek.location.entity---entity class
com.project.abhishek.location.repos---repository class
com.project.abhishek.location.service---service class
com.project.abhishek.location.util---ReportUtil class
com.project.abhishek.location.repos---repository class
答案 0 :(得分：1)
我认为主要问题是@Query（）中的sql，您有两种方法可以解决它
第一个是将查询更改为本地查询。
public interface LocationRepos extends JpaRepository<Location, Integer> {
@Query("select type,count(type) from location group by type", nativeQuery = true)
public List<Object[]> findTypeAndTypeCount();
}
第二个是满足JQL的要求
public interface LocationRepos extends JpaRepository<Location, Integer> {
@Query("select lc.type,count(lc.type) from Location lc group by lc.type")
public List<Object[]> findTypeAndTypeCount();
}
答案 1 :(得分：0)
@clevertension是正确的，主要问题在SQL查询中，编写nativeQuery = true确实解决了问题，但是由于我遇到了错误，他的答案中缺少value字段。 所以对我来说解决方案是
public interface LocationRepos extends JpaRepository<Location, Integer> {
@Query(value = "select type,count(type) from location group by type", nativeQuery = true)
public List<Object[]> findTypeAndTypeCount();
}
答案 2 :(得分：0)
Spring 无法创建 bean，因为 LocationRepository 已经注入到我的服务类中，因此在控制器标志中显式注入 LocationRepository。这是我的解决方案：
@Repository
public interface LocationRepository extends JpaRepository<Location, Integer> {
public static final String LOCATION_TYPE_COUNT = "select type, count(type) from location_tbl group by type";
@Query(value = LOCATION_TYPE_COUNT, nativeQuery = true)
public List<Object[]> findTypeAndCount();
}