Spring Hibernate annotation based master details data save error - spring

Question

I am new to Spring framework. I am trying to insert a department with some personnel in database. I am using spring-mvc and Hibernate to do so. I am following this article to implement, but I am not creating the table by SQL. The table are creating on application runtime. I am using PostgreSQL. Here are my attempts below.
My department entity class:
#SuppressWarnings("deprecation")
#Entity
#Table(name="department")
public class Department {
#Id
#GeneratedValue
#Column(name="department_id")
private Long departmentId;
#Column(name="department_name")
private String departmentName;
#OneToMany(cascade={CascadeType.ALL})
#JoinColumn(name="department_id")
#IndexColumn(name="idx")
private List<Personnel> personnels;
public Long getDepartmentId() {
return departmentId;
}
public void setDepartmentId(Long departmentId) {
this.departmentId = departmentId;
}
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public List<Personnel> getPersonnels() {
return personnels;
}
public void setPersonnels(List<Personnel> personnels) {
this.personnels = personnels;
}
My personnel entity class:
#Entity
#Table(name="personnel")
public class Personnel {
#Id
#GeneratedValue
#Column(name="personnel_id")
private Long personnelId;
#Column(name="firstname")
private String firstname;
#Column(name="lastname")
private String lastname;
#Column(name="birth_date")
private Date birthDate;
#Column(name="cell_phone")
private String cellphone;
#ManyToOne
#JoinColumn(name="department_id",
insertable=false, updatable=false,
nullable=false)
private Department department;
#Column(name="idx")
private Integer idx;
public Personnel() {
}
public Personnel(String firstname, String lastname, String phone) {
this.firstname = firstname;
this.lastname = lastname;
this.birthDate = new Date(System.currentTimeMillis());
this.cellphone = phone;
}
}
My controller save action:
#RequestMapping(value = "/save", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE)
public String save(HttpServletRequest request) {
Map<String, String[]> department = request.getParameterMap();
Map<String, String> data = departmentService.insert(department);
System.out.println("######### >> Data Saved with id :: " + data.get("id"));
return "redirect:/department/show/" + data.get("id");
}
My service insert action:
public Map<String, String> insert(Map<String, String[]> map) {
Map<String, String> params = new HashMap<String, String>();
Long id = null;
Department department = new Department();
department.setDepartmentName(map.get("departmentName")[0]);
department.setPersonnels(new ArrayList<Personnel>());
Personnel emp1 = new Personnel("Nina", "Mayers", "111");
Personnel emp2 = new Personnel("Tony", "Almeida", "222");
department.getPersonnels().add(emp1);
department.getPersonnels().add(emp2);
id = departmentDao.insertDoc(department);
params.put("id", id.toString());
return params ;
}
My dao insertDoc action:
#Transactional
public Long insertDoc(Department doc) {
Long id = (Long) sessionfactory.getCurrentSession().save(doc);
sessionfactory.getCurrentSession().flush();
return id;
}
And finally the error I get:
SEVERE: Servlet.service() for servlet [testSpring] in context with path [/testSpring] threw exception [Request processing failed; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement] with root cause
org.postgresql.util.PSQLException: ERROR: null value in column "department_id" violates not-null constraint
Detail: Failing row contains (16, 2016-08-27, 111, Nina, null, Mayers, null).
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2103)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1836)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:512)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2921)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3421)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:89)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:560)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:434)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1295)
at com.stock.dao.DepartmentDao.insertDoc(DepartmentDao.java:23)
at com.stock.dao.DepartmentDao$$FastClassBySpringCGLIB$$132caf1f.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655)
at com.stock.dao.DepartmentDao$$EnhancerBySpringCGLIB$$36cc6e45.insertDoc(<generated>)
at com.stock.service.DepartmentService.insert(DepartmentService.java:34)
at com.stock.controller.DepartmentController.save(DepartmentController.java:36)
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.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:222)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
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 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:521)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
It is showing null value problem in department_id. How can I solve it with this code block?

Answer 1

you also need to set department in Personnel also rest of the thing will be take care by hibernate .:
eg :
public Map<String, String> insert(Map<String, String[]> map) {
Map<String, String> params = new HashMap<String, String>();
Long id = null;
Department department = new Department();
department.setDepartmentName(map.get("departmentName")[0]);
department.setPersonnels(new ArrayList<Personnel>());
Personnel emp1 = new Personnel("Nina", "Mayers", "111");
Personnel emp2 = new Personnel("Tony", "Almeida", "222");
// Set Department in your emp1 and emp2 object
emp1.setDepartment(department);
emp2.setDepartment(department);
department.getPersonnels().add(emp1);
department.getPersonnels().add(emp2);
id = departmentDao.insertDoc(department);
params.put("id", id.toString());
return params ;
}
change log :
// Set Department in your emp1 and emp2 object
emp1.setDepartment(department);
emp2.setDepartment(department);

Answer 2

Read the error message carefully:
ERROR: null value in column "department_id" violates not-null constraint
Your department_id column in the department table has a non null constraint, which is being violated when you try to insert the following entity using Hibernate:
Department department = new Department();
department.setDepartmentName(map.get("departmentName")[0]);
department.setPersonnels(new ArrayList<Personnel>());
You never assign the ID, which is defaulting to NULL, causing the error you are seeing. To remedy this, assign a non null ID to the department before inserting:
department.setDepartmentId(1L); // or any value you wish