Could not obtain transaction-synchronized Session problem (fixed)

 以下程式最大問題是 createRandomAbstract 没有加 @Override @Transactional

修改以下CODE 便能解決問題

        @Override

@Transactional

public void createRandomAbstract(int theId) {

Book book=bookDao.getBook(theId);

Abstractpara abstractpara=new Abstractpara();

abstractpara.setContent("test 2");

abstractpara.setLanguage("English");

abstractpara.setBook(book);

book.addAbstractpara(abstractpara);

book=bookDao.saveBook(book);

}

======================================

package com.book.gen.domain.services.aggregates;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import com.book.gen.domain.aggregates.repositories.BookAbstractparaDao;

import com.book.gen.domain.models.*;

import com.book.gen.domain.models.repositories.AbstractparaDao;

import com.book.gen.domain.models.repositories.BookDao;

@Service

public class BookAbstractparaServiceImpl implements BookAbstractparaService {

// need to inject book Dao

@Autowired

private BookDao bookDao;

// need to inject abstractpara Dao

@Autowired

private AbstractparaDao abstractparaDao;

@Autowired

private BookAbstractparaDao bookAbstractparaRepository;

public void createRandomAbstract(int theId) {

Book book=bookDao.getBook(theId);

Abstractpara abstractpara=new Abstractpara();

abstractpara.setContent("test 2");

abstractpara.setLanguage("English");

abstractpara.setBook(book);

book.addAbstractpara(abstractpara);

book=bookDao.saveBook(book);

}

}

Type Exception Report

Message Request processing failed; nested exception is org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

Root Cause

org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
	org.springframework.orm.hibernate5.SpringSessionContext.currentSession(SpringSessionContext.java:142)
	org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:454)
	com.book.gen.domain.models.repositories.BookDaoImpl.getBook(BookDaoImpl.java:87)
	com.book.gen.domain.services.aggregates.BookAbstractparaServiceImpl.createRandomAbstract(BookAbstractparaServiceImpl.java:24)
	com.book.gen.controllers.BookControllerImpl.bookgridviewdetail3(BookControllerImpl.java:327)
	java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	java.base/java.lang.reflect.Method.invoke(Method.java:568)
	org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
	org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
	org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
	org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
	org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1063)
	org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:529)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)

Note The full stack trace of the root cause is available in the server logs.