Not able to persist Object in a table using Hibernate - spring

Question

I am consuming API with the help of Spring Boot and trying to persist the same in MySQL database by using Hibernate, but getting error doing so, I have tried things but somehow I am stuck with it.
Stack Trace
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:: Spring Boot :: (v2.0.5.RELEASE)
2018-09-20 00:51:26 INFO com.diwakar.GroupBeema - Starting GroupBeema on LP-PC0MQFY6 with PID 13084 (started by diwakar_b in C:\Diwakar Playground\GroupBeema)
2018-09-20 00:51:26 INFO com.diwakar.GroupBeema - No active profile set, falling back to default profiles: default
2018-09-20 00:51:26 INFO o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#12d4bf7e: startup date [Thu Sep 20 00:51:26 IST 2018]; root of context hierarchy
2018-09-20 00:51:27 INFO o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$c2e2ffe4] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-09-20 00:51:28 INFO o.s.b.w.e.tomcat.TomcatWebServer - Tomcat initialized with port(s): 8080 (http)
2018-09-20 00:51:28 INFO o.a.catalina.core.StandardService - Starting service [Tomcat]
2018-09-20 00:51:28 INFO o.a.catalina.core.StandardEngine - Starting Servlet Engine: Apache Tomcat/8.5.34
2018-09-20 00:51:28 INFO o.a.c.core.AprLifecycleListener - The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk1.8.0_172\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_172/bin/server;C:/Program Files/Java/jre1.8.0_172/bin;C:/Program Files/Java/jre1.8.0_172/lib/amd64;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Windows\CCM;C:\Program Files\PuTTY\;C:\Program Files\Git\cmd;C:\Program Files\Gradle\gradle-4.5.1\bin;C:\WINDOWS\System32\OpenSSH\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Users\diwakar_b\AppData\Local\Microsoft\WindowsApps;;C:\Program Files\Docker Toolbox;C:\Users\diwakar_b\Downloads\eclipse-jee-photon-R-win32-x86_64\eclipse;;.]
2018-09-20 00:51:29 INFO o.a.c.c.C.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
2018-09-20 00:51:29 INFO o.s.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 2997 ms
2018-09-20 00:51:29 INFO o.s.b.w.s.ServletRegistrationBean - Servlet dispatcherServlet mapped to [/]
2018-09-20 00:51:29 INFO o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'characterEncodingFilter' to: [/*]
2018-09-20 00:51:29 INFO o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-09-20 00:51:29 INFO o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-09-20 00:51:29 INFO o.s.b.w.s.FilterRegistrationBean - Mapping filter: 'requestContextFilter' to: [/*]
2018-09-20 00:51:29 WARN o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'hibernateUtil': Unsatisfied dependency expressed through field 'entityManagerFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getSessionfactory' defined in class path resource [com/diwakar/hibernate/HibernateUtil.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'hibernateUtil' - consider declaring the factory method as static for independence from its containing instance. Factory method 'getSessionfactory' threw exception; nested exception is java.lang.NullPointerException
2018-09-20 00:51:29 INFO o.a.catalina.core.StandardService - Stopping service [Tomcat]
2018-09-20 00:51:29 INFO o.s.b.a.l.ConditionEvaluationReportLoggingListener -
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-09-20 00:51:29 ERROR o.s.boot.SpringApplication - Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'hibernateUtil': Unsatisfied dependency expressed through field 'entityManagerFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getSessionfactory' defined in class path resource [com/diwakar/hibernate/HibernateUtil.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'hibernateUtil' - consider declaring the factory method as static for independence from its containing instance. Factory method 'getSessionfactory' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265)
at com.diwakar.GroupBeema.main(GroupBeema.java:10)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getSessionfactory' defined in class path resource [com/diwakar/hibernate/HibernateUtil.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'hibernateUtil' - consider declaring the factory method as static for independence from its containing instance. Factory method 'getSessionfactory' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583)
... 19 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'hibernateUtil' - consider declaring the factory method as static for independence from its containing instance. Factory method 'getSessionfactory' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582)
... 31 common frames omitted
Caused by: java.lang.NullPointerException: null
at com.diwakar.hibernate.HibernateUtil.getSessionfactory(HibernateUtil.java:19)
at com.diwakar.hibernate.HibernateUtil$$EnhancerBySpringCGLIB$$462ca353.CGLIB$getSessionfactory$0(<generated>)
at com.diwakar.hibernate.HibernateUtil$$EnhancerBySpringCGLIB$$462ca353$$FastClassBySpringCGLIB$$adc355b2.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:365)
at com.diwakar.hibernate.HibernateUtil$$EnhancerBySpringCGLIB$$462ca353.getSessionfactory(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 32 common frames omitted
GroupBeema Class
package com.diwakar;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class GroupBeema{
public static void main(String[] args) {
SpringApplication.run(GroupBeema.class, args);
}
}
InsurerController
package com.diwakar.insurer;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.diwakar.hibernate.InsurerDao;
#RestController
public class InsurerController {
#Autowired
public InsurerService insurerService;
#Autowired
private InsurerDao insurerDao;
#RequestMapping("/insure")
public List<Insurer> getInsurersInfo() {
List<Insurer> list = insurerService.getAllInsurer();
//insurerService.createTable(list);
insurerDao.createInsurer(list);
return list;
}
}
InsurerService
package com.diwakar.insurer;
import java.util.ArrayList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
#Service
public class InsurerService {
public List<Insurer> getAllInsurer( ) {
List<Insurer> list = new ArrayList<Insurer>();
try {
Client client = Client.create();
WebResource webResource = client.resource("https://termlife.policybazaar.com/api/v1/quotes");
String input = "//some json data"
ClientResponse response = webResource.type("application/json").post(ClientResponse.class, input);
if (response.getStatus() != 200) {
throw new RuntimeException("Failed : HTTP error code : " + response.getStatus());
}
String output = response.getEntity(String.class);
JSONArray jsonArray = new JSONArray(output);
for(int n = 0; n < jsonArray.length(); n++) {
JSONObject obj = jsonArray.getJSONObject(n);
Insurer ins = new Insurer();
ins.setBasicPremium(obj.getInt("BasicPremium"));
ins.setE2EName(obj.getString("E2EName"));
ins.setE2ESupplier(obj.getString("E2ESupplier"));
list.add(ins);
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}
}
HibernateUtil
package com.diwakar.hibernate;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
#Configuration
public class HibernateUtil {
#Autowired
private EntityManagerFactory entityManagerFactory;
#Bean
public SessionFactory getSessionfactory() {
if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
//throw new NullPointerException("factory is not hibernate factory.!!");
System.out.println("Exception in getSessionfactory method..");
}
return entityManagerFactory.unwrap(SessionFactory.class);
}
}
InsurerDAO
package com.diwakar.hibernate;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import com.diwakar.insurer.Insurer;
#Repository
public class InsurerDao {
#Autowired
private SessionFactory sessionFactory;
public void createInsurer(List<Insurer> insurer) {
Session session = null;
//SessionFactory sessionFactory = null;
try {
//sessionFactory = new Configuration().buildSessionFactory();
session = sessionFactory.openSession();
session.beginTransaction();
Integer i = (Integer) session.save(insurer);
System.out.println("Insurer table is created with " + i + " records..!!");
session.getTransaction().commit();
} catch(Exception e) {
e.printStackTrace();
}
}
}
Application properties
//assume everything is correct

Answer 1

The problem with your code is that SessionFactory is a subinterface to EntityManagerFactory. Even if you change that to EntityManager, it won't work as EntityManager is dependent on EntityManagerFactory and therefore, the method for it is called first in the lifecycle at startup. Could you please explain, why you need the SessionFactory? If you want to have the EntityManager, you can just inject that by using #PersistenceContext in your services.

Answer 2

You cannot autowire in a configuration class put pass your dependencies as parameters
So your HibernateUtil must look like:
#Configuration
public class HibernateUtil {
#Bean
public SessionFactory getSessionfactory(EntityManagerFactory entityManagerFactory) {
if (entityManagerFactory.unwrap(SessionFactory.class) == null) {
//throw new NullPointerException("factory is not hibernate factory.!!");
System.out.println("Exception in getSessionfactory method..");
}
return entityManagerFactory.unwrap(SessionFactory.class);
}
}