PropertyReferenceException:No property - spring

Question

For several days I'm trying to create Spring CRUD application. I'm confused. I can't solve this errors.
Here is the relevant files
Models:-
State
#NoArgsConstructor
#Data
#Entity
public class State {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int stateId;
private String stateCode;
private String stateName;
#ManyToOne
#JoinColumn(name = "COUNTRY_CODE")
private Country country;
}
Country
#NoArgsConstructor
#Data
#Entity
public class Country {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private int countryId;
private String countryCode;
private String countryName;
#OneToMany(mappedBy = "country")
private List<State> stateList;
}
Service, UtilityService
#Service
public interface UtilityService {
public HashMap<String,String> getListOfCountries();
public HashMap<String,String> getStateListForSelectedCountry(String countryCode);
}
UtilityServiceImpl
#Service
public class UtilityServiceImpl implements UtilityService {
#Autowired
CountryRepository countryRepository;
#Autowired
StateRepository stateRepository;
#Autowired
DataSource dataSource;
public HashMap<String,String> getStateListForSelectedCountry(String countryCode){
Map<String,String> mapOfStates = new HashMap<>();
List<State> listOfStates = stateRepository.findAllByCountryCode(countryCode);
listOfStates.forEach(ele ->{
mapOfStates.put(ele.getStateCode(),ele.getStateName());
});
return (HashMap)mapOfStates;
}
But then I get the following error :-
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'utilityServiceImpl': Unsatisfied dependency expressed through field 'stateRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stateRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.self.learning.jwtAuthApp.repository.StateRepository.findAllByCountry_Code(java.lang.String)! No property code found for type Country! Traversed path: State.country.
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:643) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) ~[spring-boot-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at com.self.learning.jwtAuthApp.JwtAuthAppApplication.main(JwtAuthAppApplication.java:12) ~[classes!/:0.0.1-SNAPSHOT]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) ~[jwtAuth-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) ~[jwtAuth-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) ~[jwtAuth-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) ~[jwtAuth-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'stateRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.self.learning.jwtAuthApp.repository.StateRepository.findAllByCountry_Code(java.lang.String)! No property code found for type Country! Traversed path: State.country.
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1796) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
... 27 common frames omitted
Caused by: java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List com.self.learning.jwtAuthApp.repository.StateRepository.findAllByCountry_Code(java.lang.String)! No property code found for type Country! Traversed path: State.country.
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:96) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:103) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:209) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:78) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lookupQuery(RepositoryFactorySupport.java:574) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$mapMethodsToQuery$1(RepositoryFactorySupport.java:567) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133) ~[na:na]
at java.base/java.util.Collections$UnmodifiableCollection$1.forEachRemaining(Collections.java:1054) ~[na:na]
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.mapMethodsToQuery(RepositoryFactorySupport.java:569) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$new$0(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at java.base/java.util.Optional.map(Optional.java:265) ~[na:na]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.<init>(RepositoryFactorySupport.java:559) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:332) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.lambda$afterPropertiesSet$5(RepositoryFactoryBeanSupport.java:297) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.util.Lazy.getNullable(Lazy.java:212) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.util.Lazy.get(Lazy.java:94) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:300) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:121) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1855) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1792) ~[spring-beans-5.2.4.RELEASE.jar!/:5.2.4.RELEASE]
... 37 common frames omitted
Caused by: org.springframework.data.mapping.PropertyReferenceException: No property code found for type Country! Traversed path: State.country.
at org.springframework.data.mapping.PropertyPath.<init>(PropertyPath.java:94) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:382) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:358) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.mapping.PropertyPath.create(PropertyPath.java:342) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.mapping.PropertyPath.lambda$from$0(PropertyPath.java:314) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at java.base/java.util.concurrent.ConcurrentMap.computeIfAbsent(ConcurrentMap.java:330) ~[na:na]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:293) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.mapping.PropertyPath.from(PropertyPath.java:276) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.query.parser.Part.<init>(Part.java:82) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$OrPart.lambda$new$0(PartTree.java:251) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na]
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
at org.springframework.data.repository.query.parser.PartTree$OrPart.<init>(PartTree.java:252) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.query.parser.PartTree$Predicate.lambda$new$0(PartTree.java:381) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195) ~[na:na]
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na]
at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
at org.springframework.data.repository.query.parser.PartTree$Predicate.<init>(PartTree.java:382) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.repository.query.parser.PartTree.<init>(PartTree.java:97) ~[spring-data-commons-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
at org.springframework.data.jpa.repository.query.PartTreeJpaQuery.<init>(PartTreeJpaQuery.java:89) ~[spring-data-jpa-2.2.5.RELEASE.jar!/:2.2.5.RELEASE]
... 63 common frames omitted
I am not able to understand what am I doing wrong.
My Oracle database table structure is:-
Country :-
Country_Id
Country_Name
Country_Code
State :-
State_Id
State_Name
State_Code
Country_Code ( this is the FK)

Answer 1

The exception explains in some detail what is going wrong (I added line breaks to make it easier to read):
Failed to create query for method
public abstract java.util.List com.self.learning.jwtAuthApp.repository.StateRepository.findAllByCountry_Code(java.lang.String)!
No property code found for type Country!
Traversed path: State.country.
What this tells you is that Spring Data tries to create the implementation for the method findAllByCountry_Code but can't find a matching property.
Specifically it found the property country which is of type Country and now fails to find a property code in the type Country.
If one compares that with your entity one has to agree.
There is no code in Country there is only a countryCode which you probably want to refer to.
So the correct method name should be
findAllByCountry_CountryCode
Alternatively you could rename the property Country.countryCode to Country.code which in my opinion would would be the better solution since the repeated country is really just noise and should be dropped in the first place.