title: java.lang.InstantiationError for Abstract class with Spring Data Mongo
body: <p>I am using Spring data Mongo Db with graph QL and facing an issue while fetching the data from DB for the Abstract class. Please find the below details.</p>
  <pre><code>@Data
      public static class Employee&lt;T extends Account&gt; {
          private String name;
          private T account;
      }
  
      @Data
      public static abstract class Account {
      }
  
      @Data
      public static class CurrentAccount extends Account {
          private BigDecimal balance;
          private BigDecimal limit;
      }
  
      @Data
      public static class SavingAccount extends Account {
          private BigDecimal balance;
      }
  </code></pre>
  <p>The generic type is decided at runtime using deserializer as below</p>
  <pre><code>private static final JavaType withCurrent = TypeFactory.defaultInstance()
              .constructParametricType(Employee.class, CurrentAccount.class);
  
      private static final JavaType withSaving = TypeFactory.defaultInstance()
              .constructParametricType(Employee.class, SavingAccount.class);
  
      public static JavaType determineType(String topic, byte[] data, Headers headers) throws IOException {
          if (headers.lastHeader(&quot;accountType&quot;).value()[0] == 'C') {
              return withCurrent;
          }
          else {
              return withSaving;
          }
      }
  
      public static class MySerializer extends JsonSerializer&lt;Employee&lt;?&gt;&gt; {
  
          @Override
          public byte[] serialize(String topic, Headers headers, Employee&lt;?&gt; emp) {
              headers.add(new RecordHeader(&quot;accountType&quot;,
                      new byte[] { (byte) (emp.getAccount() instanceof CurrentAccount ? 'C' : 'S')}));
              return super.serialize(topic, headers, emp);
          }
  
      }
  </code></pre>
  <p><strong>Repository code</strong></p>
  <pre><code>@Transactional(readOnly = true)
      @GraphQLQuery
      public EmployeeObjPageable findAllEmployeesBySearchAndSort(SearchSortCriteria ss) {
         
          Optional&lt;EmployeeObjPageable&gt; employees = tradeInstructionRepository.findAllEmployeesBySearchAndSort(ss,
                  Employee.class, EmployeeObjPageable.class);
          if (employees.isPresent())
              return getEmployeesDataPageable(employees.get());
      }
  
  public Optional&lt;?&gt; findAllEmployeesBySearchAndSort(SearchSortCriteria ss, Class collectionType, Class outputType) {
          if (ss == null)
              return Optional.of(null);
  
          TypedAggregation&lt;?&gt; aggregation = Aggregation.newAggregation(collectionType, getAggregationOperation(ss, collectionType, mongoTemplate))
                  .withOptions(Aggregation.newAggregationOptions().allowDiskUse(true).build());
          AggregationResults&lt;?&gt; results = mongoTemplate.aggregate(aggregation, collectionType, outputType);
          return Optional.ofNullable(results.getUniqueMappedResult());
      }
  </code></pre>
  <p>So when I try to fetch any data for Employee from Mongo DB then getting the below error</p>
  <pre><code>2020-11-25 15:36:36.975 ERROR 9384 --- [io-10010-exec-9] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : 
  Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
   [Handler dispatch failed; nested exception is java.lang.InstantiationError: com.model.Employee] with root cause
  
  java.lang.InstantiationError: com.model.Account
      at com.model.Account_Instantiator_1wfce5.newInstance(Unknown Source) ~[classes/:na]
      at org.springframework.data.mapping.model.ClassGeneratingEntityInstantiator$EntityInstantiatorAdapter.createInstance(ClassGeneratingEntityInstantiator.java:238) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.mapping.model.ClassGeneratingEntityInstantiator.createInstance(ClassGeneratingEntityInstantiator.java:87) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:344) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:317) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1580) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1478) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:450) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.populateProperties(MappingMongoConverter.java:367) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:347) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:317) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readCollectionOrArray(MappingMongoConverter.java:1119) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readValue(MappingMongoConverter.java:1578) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter$MongoDbPropertyValueProvider.getPropertyValue(MappingMongoConverter.java:1478) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.readProperties(MappingMongoConverter.java:450) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.populateProperties(MappingMongoConverter.java:367) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:347) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:317) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:250) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:246) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.convert.MappingMongoConverter.read(MappingMongoConverter.java:98) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate$ReadDocumentCallback.doWith(MongoTemplate.java:3141) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate.lambda$null$23(MongoTemplate.java:2163) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at com.mongodb.client.internal.MappingIterable$1.accept(MappingIterable.java:62) ~[mongodb-driver-sync-4.0.5.jar:na]
      at com.mongodb.client.internal.MongoIterableImpl.forEach(MongoIterableImpl.java:123) ~[mongodb-driver-sync-4.0.5.jar:na]
      at com.mongodb.client.internal.MappingIterable.forEach(MappingIterable.java:59) ~[mongodb-driver-sync-4.0.5.jar:na]
      at com.mongodb.client.internal.MappingIterable.into(MappingIterable.java:69) ~[mongodb-driver-sync-4.0.5.jar:na]
      at org.springframework.data.mongodb.core.MongoTemplate.lambda$doAggregate$24(MongoTemplate.java:2166) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate.execute(MongoTemplate.java:566) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate.doAggregate(MongoTemplate.java:2124) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:2093) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at org.springframework.data.mongodb.core.MongoTemplate.aggregate(MongoTemplate.java:1983) ~[spring-data-mongodb-3.0.2.RELEASE.jar:3.0.2.RELEASE]
      at com.empolyee.util.SearchAndSortUtil.getAggregateDocuments(FGPSSUtil.java:36) ~[classes/:na]
      at com.empolyee.repository.CustomAggregationImpl.findAllEmployeesBySearchAndSort(CustomAggregationImpl.java:20) ~[classes/:na]
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
      at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
      at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
      at org.springframework.data.repository.core.support.ImplementationInvocationMetadata.invoke(ImplementationInvocationMetadata.java:72) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:382) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:205) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:549) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:155) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:130) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80) ~[spring-data-commons-2.3.2.RELEASE.jar:2.3.2.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at com.sun.proxy.$Proxy104.findAllEmployeesBySearchAndSort(Unknown Source) ~[na:na]
      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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at com.sun.proxy.$Proxy104.findAllEmployeesBySearchAndSort(Unknown Source) ~[na:na]
      at com.service.EmployeeService.findAllEmployeesBySearchAndSort(EmployeeService.java:229) ~[classes/:na]
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
      at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
      at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
      at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
      at io.leangen.graphql.metadata.execution.SingletonMethodInvoker.execute(SingletonMethodInvoker.java:21) ~[spqr-0.9.9.jar:na]
      at io.leangen.graphql.metadata.Resolver.resolve(Resolver.java:100) ~[spqr-0.9.9.jar:na]
      at io.leangen.graphql.execution.OperationExecutor.lambda$execute$1(OperationExecutor.java:93) ~[spqr-0.9.9.jar:na]
      at io.leangen.graphql.execution.OperationExecutor.execute(OperationExecutor.java:98) ~[spqr-0.9.9.jar:na]
      at io.leangen.graphql.execution.OperationExecutor.execute(OperationExecutor.java:94) ~[spqr-0.9.9.jar:na]
      at io.leangen.graphql.execution.OperationExecutor.execute(OperationExecutor.java:59) ~[spqr-0.9.9.jar:na]
      at graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:261) ~[graphql-java-11.0.jar:na]
      at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:202) ~[graphql-java-11.0.jar:na]
      at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:70) ~[graphql-java-11.0.jar:na]
      at graphql.execution.Execution.executeOperation(Execution.java:159) ~[graphql-java-11.0.jar:na]
      at graphql.execution.Execution.execute(Execution.java:101) ~[graphql-java-11.0.jar:na]
      at graphql.GraphQL.execute(GraphQL.java:573) ~[graphql-java-11.0.jar:na]
      at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:515) ~[graphql-java-11.0.jar:na]
      at graphql.GraphQL.executeAsync(GraphQL.java:489) ~[graphql-java-11.0.jar:na]
      at graphql.GraphQL.execute(GraphQL.java:420) ~[graphql-java-11.0.jar:na]
      at io.leangen.graphql.spqr.spring.web.servlet.DefaultGraphQLExecutor.execute(DefaultGraphQLExecutor.java:23) ~[graphql-spqr-spring-boot-autoconfigure-0.0.4.jar:na]
      at io.leangen.graphql.spqr.spring.web.servlet.DefaultGraphQLExecutor.execute(DefaultGraphQLExecutor.java:11) ~[graphql-spqr-spring-boot-autoconfigure-0.0.4.jar:na]
      at io.leangen.graphql.spqr.spring.web.GraphQLController.executeJsonPost(GraphQLController.java:42) ~[graphql-spqr-spring-boot-autoconfigure-0.0.4.jar:na]
      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.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
      at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.37.jar:4.0.FR]
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.8.RELEASE.jar:5.2.8.RELEASE]
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
      at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.37.jar:9.0.37]
      at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
  
  </code></pre>
  <p>MongoDb not able to instantiate the Abstract classes.
  I tried below but no luck
  <a href="https://medium.com/@mladen.maravic/spring-data-mongodb-my-take-on-inheritance-support-102361c08e3d" rel="nofollow noreferrer">https://medium.com/@mladen.maravic/spring-data-mongodb-my-take-on-inheritance-support-102361c08e3d</a></p>
  <p><a href="https://stackoverflow.com/questions/42121506/spring-data-rest-repository-with-abstract-class-inheritance">Spring Data Rest Repository with abstract class / inheritance</a></p>
  <p>Please suggest something</p>