org.hibernate.InstantiationException: Cannot instantiate abstract class or interface

java hibernate jpa inheritance

16,768

Solution 1

Ok, so it turns out some of the entities that inherited from Compensation had properties with ManyToOne relations and they were missing cascade annotations. Because they were more than one property, I received no TransientPropertyValueException and instead it tried to load the parent Compensation entity which was the closest thing that it could associate the entity to without those fields that weren't being cascaded. Which means that this whole problem was due to missing cascade annotations.

For example:

@Entity
@Table(name = "davt_compensation_service_relocation")
public class RelocationCompensation extends Compensation<RelocationCompensation> {

    @Valid
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "phone_id")
    @ForeignKey(name = "FK_relocationCompensation_phone")
    private Phone phone = new Phone();

    @Valid
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "address_id")
    @ForeignKey(name = "FK_relocationCompensation_address")
    private Address address = new Address();

    //rest of properties, setters and getters, equals and hashcode overrides
}

Changed to:

@Entity
@Table(name = "davt_compensation_service_relocation")
public class RelocationCompensation extends Compensation<RelocationCompensation> {

    @Valid
    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "phone_id")
    @ForeignKey(name = "FK_relocationCompensation_phone")
    private Phone phone = new Phone();

    @Valid
    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinColumn(name = "address_id")
    @ForeignKey(name = "FK_relocationCompensation_address")
    private Address address = new Address();

    //rest of properties, setters and getters, equals and hashcode overrides
}

Solution 2

For others that the above solutions might not work, give this a thought and a try afterwards: When you have you child entities inherit parent entity you will not be able to instantiate the Parent itself but you should instantiate the child that has the parents properties - For example i had Parent abstract class Profile and i had a child class StudentProfile that extended it. I tried instantiating a list of profiles and it threw the exception(I had data in the profile table in the database but i forgot to add data to the StudentProfile table(and connect them through the for foreign key column - in my case id) My solution was to add the corresponding data to the StudentProfile table and then i was able to get rid of the exception. Hope this helps!!

Solution 3

Since this is the only question that comes up you google search this error, I wanted to share another potential solution. I had an issue when my abstract class used Single Table inheritance and gave the 'Cannot instantiate abstract class or interface' exception when I tried to read my pre-loaded data.

My persistence.xml contained the abstract class, but it did not include the classes that extend the abstract class. Since the code to read the classes are not directly referenced they do not throw a invalid entity class exception. When it tried to instantiate the class based on the DiscriminatorColumn value it threw this error. Adding the implementation class to persistence.xml fixed this issue.

Solution 4

My fault was, that I forgot to mark the inherited Entity as such (with @Entity) and so Hibernate had no concrete class to load the data

View more solutions

16,768

Author by

Nimchip

Updated on June 12, 2022

Comments

Nimchip almost 2 years

I have the following entity:

@Entity
@Table(name = "davt_compensation_service")
@Inheritance(strategy = InheritanceType.JOINED)
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public abstract class Compensation<C extends Compensation> extends AutoIdBasedEntity {
    //properties, setters and getters, equals and hashcode overrides.
}

The rest inherit from it (one of them for example):

@Entity
@Table(name = "davt_compensation_service_relocation")
public class RelocationCompensation extends Compensation<RelocationCompensation> {
    //properties, setters and getters, equals and hashcode overrides
}

A parent entity that contains a collection of Compensations:

@Entity
@Table(name = "davt_compensation_case")
@EntityListeners({CompensationCaseNumberListener.class})
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class CompensationCase extends AutoIdBasedEntity {

    @Valid
    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "compensationCase", orphanRemoval = true)
    @MapKey(name = "conceptType")
    private Map<ConceptType, Compensation> compensationServices = new HashMap<>();
}

Last but not least, I have a the main entity CompensationFile which has a collection of CompensationCase entities:

@Entity
@Table(name = "davt_compensation_file")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class CompensationFile extends AutoIdBasedEntity {

    @Valid
    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "compensationFile", orphanRemoval = true)
    private Set<CompensationCase> compensationCases;
}

It's strange because this used to work and suddenly it started working up. For some reason it only happens when updating and existing CompensationCase and adding a new Compensation. For example, if I am persisting an entirely new main CompensationCase, it works without a hitch. I use the JpaRepository method save on the main entity CompensationFile to persist the entire thing as shown below (and where it is throwing the exception):

CompensationFileFormService:

@Service
public class CompensationFileFormService {
    @Autowired
    private CompensationFileRepository compensationFileRepository;

    @Autowired
    private CompensationFileFormConverter compensationFileFormConverter;

    @Autowired
    private CompensationCaseService compensationCaseService;        

    public CompensationFileForm saveCompensationFile(CompensationFileForm compensationFileForm) throws TaskNotFoundException, InvalidServiceTypeException, CompensationFileNotFoundException, CompensationCaseNotFoundException {

        CompensationFile compensationFile = compensationFileFormConverter.convertToCompensationFile(compensationFileForm);

        //EXCEPTION IS THROWN HERE
        CompensationFile newCompensationFile = compensationFileRepository.save(compensationFile);

        if (!newCompensationFile.getCompensationCases().isEmpty()) {
            for (CompensationCase compensationCase : newCompensationFile.getCompensationCases()) {
                compensationCaseTaskService.save(compensationCase, compensationCase.getAssignedPersonnel());
            }
        }

        return createCompensationFileForm(newCompensationFile.getId(), newCompensationFile.getControlId(), compensationFileForm.getSelectedCompensationCase().getId());
    }
}

CompensationFileRepository:

public interface CompensationFileRepository extends JpaRepository<CompensationFile, Long>, JpaSpecificationExecutor<CompensationFile> { 
}

Exception thrown:

26-Jul-2015 21:45:27.061 SEVERE [http-nio-9090-exec-11] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [dispatcher] in context with path [/nimchip] threw exception [Request processing failed; nested exception is org.springframework.webflow.execution.ActionExecutionException: Exception thrown executing [AnnotatedAction@1b7ee93d targetAction = [EvaluateAction@2902b1e5 expression = compensationFileFormService.saveCompensationFile(compensationFileForm), resultExpression = flowScope.compensationFileForm], attributes = map[[empty]]] in state 'save' of flow 'compensation/file/compensation-file' -- action execution attributes were 'map[[empty]]'] with root cause
 org.hibernate.InstantiationException: Cannot instantiate abstract class or interface: sijc.davt.compensation.model.concepts.Compensation
    at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:114)
    at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:136)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.instantiate(AbstractEntityTuplizer.java:727)
    at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:4440)
    at org.hibernate.type.EntityType.replace(EntityType.java:285)
    at org.hibernate.type.MapType.replaceElements(MapType.java:83)
    at org.hibernate.type.CollectionType.replace(CollectionType.java:570)
    at org.hibernate.type.TypeHelper.replace(TypeHelper.java:177)
    at org.hibernate.event.internal.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:372)
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:184)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:157)
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:914)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:896)
    at org.hibernate.engine.spi.CascadingAction$6.cascade(CascadingAction.java:288)
    at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:409)
    at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:350)
    at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
    at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
    at org.hibernate.event.internal.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:439)
    at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:308)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:151)
    at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:76)
    at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:904)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:888)
    at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:892)
    at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:879)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:344)
    at com.sun.proxy.$Proxy550.merge(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:291)
    at com.sun.proxy.$Proxy550.merge(Unknown Source)
    at org.springframework.data.jpa.repository.support.SimpleJpaRepository.save(SimpleJpaRepository.java:392)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:405)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:390)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:344)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:267)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:111)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
    at com.sun.proxy.$Proxy677.save(Unknown Source)
    at test.nimchip.davt.compensation.ui.service.CompensationFileFormService.saveCompensationFile(CompensationFileFormService.java:109)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:112)
    at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:129)
    at org.springframework.expression.spel.ast.MethodReference.access$000(MethodReference.java:49)
    at org.springframework.expression.spel.ast.MethodReference$MethodValueRef.getValue(MethodReference.java:342)
    at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88)
    at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:131)
    at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:299)
    at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84)
    at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75)
    at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188)
    at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145)
    at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51)
    at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:101)
    at org.springframework.webflow.engine.State.enter(State.java:194)
    at org.springframework.webflow.engine.Transition.execute(Transition.java:228)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.execute(FlowExecutionImpl.java:395)
    at org.springframework.webflow.engine.impl.RequestControlContextImpl.execute(RequestControlContextImpl.java:214)
    at org.springframework.webflow.engine.TransitionableState.handleEvent(TransitionableState.java:116)
    at org.springframework.webflow.engine.Flow.handleEvent(Flow.java:547)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.handleEvent(FlowExecutionImpl.java:390)
    at org.springframework.webflow.engine.impl.RequestControlContextImpl.handleEvent(RequestControlContextImpl.java:210)
    at org.springframework.webflow.engine.ViewState.handleEvent(ViewState.java:231)
    at org.springframework.webflow.engine.ViewState.resume(ViewState.java:195)
    at org.springframework.webflow.engine.Flow.resume(Flow.java:537)
    at org.springframework.webflow.engine.impl.FlowExecutionImpl.resume(FlowExecutionImpl.java:259)
    at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:169)
    at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:228)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:868)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at test.nimchip.filter.LocaleConfigurerFilter.doFilterInternal(LocaleConfigurerFilter.java:35)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659)
    at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)

Any help at all will be appreciated.

AztecWarrior_25 over 4 years

I had another problem where the database had values belonging to all child classes, but the application had excluded one of the child classes ORM file which had one of the child entities during an older refactor. We had one base table, 6 derived tables in DB, and one base class only 5 included derived Java classes I was able to debug this by first using the FROM Clause (which did the giant outer joins with 5 tables in java) from the hibernate/HQL log and compare that with a really ugly UNION sql query on all the child tables in plain SQL and compare. Diff helped point to fix
Cas over 3 years

TL;DR: Make sure there is data in one of the inheriting class' tables. If there is only data in the shared superclass table, you will get this exception.