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根本原因是
org.hibernate.TransactionException: Already have an associated managed connection
如果有人可以帮助我了解问题的原因。请随时询问更多详情。我能想到的一个可能原因是我在其中遇到此异常并执行 @JoinColumn 以连接两个表并显示结果的部分。我应该采取什么预防措施来避免这种情况。
package com.next.domain;
import static javax.persistence.GenerationType.AUTO;
import static org.apache.commons.lang.builder.EqualsBuilder.reflectionEquals;
import static org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode;
import static org.apache.commons.lang.builder.ToStringBuilder.reflectionToString;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
@Entity
@Table(name="answers")
@XmlRootElement
public class Answer implements Serializable {
private static final long serialVersionUID = 1L;
private Long mId;
private Long mQuizId;
@Size(max=1000, message="\'Description\' must be less than 1000 characters.")
private String mContent;
private Date mRegDate;
@Id
@GeneratedValue(strategy = AUTO)
public Long getId() {
return mId;
}
public void setId(Long id) {
mId = id;
}
@Column(name="quiz_id")
public Long getQuizId() {
return mQuizId;
}
public void setQuizId(Long quizId) {
mQuizId = quizId;
}
@Column(name="content")
public String getContent() {
return mContent;
}
public void setContent(String content) {
mContent = content;
}
@Column(name="reg_date")
public Date getRegDate() {
return mRegDate;
}
public void setRegDate(Date regDate) {
mRegDate = regDate;
}
@Override
public boolean equals(Object obj) {
return reflectionEquals(this, obj);
}
@Override
public int hashCode() {
return reflectionHashCode(this);
}
@Override
public String toString() {
return reflectionToString(this);
}
}
package com.next.domain;
import static javax.persistence.GenerationType.AUTO;
import static org.apache.commons.lang.builder.EqualsBuilder.reflectionEquals;
import static org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode;
import static org.apache.commons.lang.builder.ToStringBuilder.reflectionToString;
import java.io.Serializable;
import java.util.Date;
import java.util.List;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
import org.hibernate.validator.constraints.NotEmpty;
@Entity
@Table(name="quizzes")
@XmlRootElement
public class Quiz implements Serializable {
private static final long serialVersionUID = 1L;
private Long mId;
private Integer mSection;
private Long mAnswerId;
@NotEmpty(message="\'Title\' must not be empty.")
@Size(max=64, message="\'Title\' must be less than 64 characters.")
private String mTitle;
@Size(max=256, message="\'Question\' must be less than 256 characters.")
private String mContent;
@Size(max=256, message="\'Description\' must be less than 256 characters.")
private String mDescription;
private List<Answer> mAnswers;
private Date mRegDate;
@Id
@GeneratedValue(strategy = AUTO)
public Long getId() {
return mId;
}
public void setId(Long id) {
mId = id;
}
@Column(name="section")
public Integer getSection() {
return mSection;
}
public void setSection(Integer mSection) {
this.mSection = mSection;
}
@Column(name="answer_id")
public Long getAnswerId() {
return mAnswerId;
}
public void setAnswerId(Long answer_id) {
mAnswerId = answer_id;
}
@Column(name="title")
public String getTitle() {
return mTitle;
}
public void setTitle(String title) {
mTitle = title;
}
@Column(name="content")
public String getContent() {
return mContent;
}
public void setContent(String content) {
mContent = content;
}
@Column(name="description")
public String getDescription() {
return mDescription;
}
public void setDescription(String description) {
mDescription = description;
}
@OneToMany(cascade={CascadeType.MERGE, CascadeType.REMOVE})
@JoinColumn(name="quiz_id", referencedColumnName="id")
public List<Answer> getAnswers() {
return mAnswers;
}
public void setAnswers(List<Answer> answers) {
mAnswers = answers;
}
@Column(name="reg_date")
public Date getRegDate() {
return mRegDate;
}
public void setRegDate(Date regDate) {
mRegDate = regDate;
}
@Override
public boolean equals(Object obj) {
return reflectionEquals(this, obj);
}
@Override
public int hashCode() {
return reflectionHashCode(this);
}
@Override
public String toString() {
return reflectionToString(this);
}
}
package com.next.persistence;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.next.domain.Answer;
import com.next.domain.Quiz;
import com.next.domain.QuizSubmission;
@Repository("quizDao")
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Throwable.class)
public class QuizDaoImpl implements QuizDao {
private static final String QUIZ_SELECT_CLAUSE = "select new map(q.id as id, q.title as title, q.regDate as regDate)";
private static final String ANSWER_SELECT_CLAUSE = "select new map(a.id as id, a.content as content)";
@PersistenceContext(type=PersistenceContextType.EXTENDED)
private EntityManager em;
@Override
public void addQuiz(Quiz quiz) {
em.persist(quiz);
}
@Override
public void saveQuiz(Quiz quiz) {
em.merge(quiz);
}
@Override
public void deleteQuiz(long id) {
try {
em.remove(getQuiz(id));
} catch (IllegalArgumentException ie) {
return;
}
}
@Override
public Quiz getQuiz(long id) {
Quiz quiz = null;
try {
quiz = em.find(Quiz.class, id);
} catch (NoResultException e) {}
return quiz;
}
@Override
public void addAnswer(Answer answer) {
em.persist(answer);
}
@Override
public void saveAnswer(Answer answer) {
em.merge(answer);
}
@Override
public void deleteAnswer(long id) {
try {
em.remove(getAnswer(id));
} catch (IllegalArgumentException ie) {
return;
}
}
@Override
public Answer getAnswer(long id) {
Answer answer = null;
try {
answer = em.find(Answer.class, id);
} catch (NoResultException e) {}
return answer;
}
@SuppressWarnings("unchecked")
@Override
public List<Map<String, Object>> getAnswers(long quizId) {
return (List<Map<String, Object>>) em.createQuery(ANSWER_SELECT_CLAUSE + " from Answer a where a.quizId = :quizId")
.setParameter("quizId", quizId)
.getResultList();
}
@SuppressWarnings("unchecked")
@Override
public List<Map<String, Object>> getQuizzes(int section) {
return (List<Map<String, Object>>) em.createQuery(QUIZ_SELECT_CLAUSE + " from Quiz q where q.section = :section order by q.regDate desc")
.setParameter("section", section)
.getResultList();
}
@SuppressWarnings("unchecked")
@Override
public List<Map<String, Object>> getQuizzesDetails(int section) {
return (List<Map<String, Object>>) em.createQuery("select q from Quiz q where q.section = :section order by q.regDate desc")
.setParameter("section", section)
.getResultList();
}
@Override
public Answer getAnswerByQuizId(long quizId) {
Answer answer = null;
try {
answer = em.find(Answer.class, quizId);
} catch (NoResultException e) {
}
return answer;
}
@Override
public void addQuizSubmission(QuizSubmission quizSubmission) {
em.persist(quizSubmission);
}
@Override
public void saveQuizSubmission(QuizSubmission quizSubmission) {
em.merge(quizSubmission);
}
@Override
public void deleteQuizSubmission(long id) {
try {
em.remove(getQuiz(id));
} catch (IllegalArgumentException ie) {
return;
}
}
@Override
public QuizSubmission getQuizSubmission(long id) {
QuizSubmission quizSubmission = null;
try {
quizSubmission = em.find(QuizSubmission.class, id);
} catch (NoResultException e) {}
return quizSubmission;
}
@SuppressWarnings("unchecked")
@Override
public List<Map<String, Object>> getQuizSubmissions(long quizId) {
return (List<Map<String, Object>>) em.createQuery("select qs from QuizSubmission qs where qs.quizId = :quizId order by qs.date desc")
.setParameter("quizId", quizId)
.getResultList();
}
@SuppressWarnings("unchecked")
@Override
public List<QuizSubmission> getQuizSubmissions(String date) {
/*return em.createNativeQuery("SELECT `id`, `quiz_id`, `answer_id`, `date` FROM `quizzes_submissions` WHERE DATE(`date`) = :date")
.setParameter("date", date )
.getResultList();*/
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date startDate = null;
Date endDate = null;
try {
startDate = format.parse(date.trim()+" 00:00:00");
endDate = format.parse(date.trim()+" 23:59:59");
} catch (ParseException e) {
e.printStackTrace();
}
return em.createQuery("select qs from QuizSubmission qs WHERE qs.date BETWEEN :startDate AND :endDate")
.setParameter("startDate", startDate)
.setParameter("endDate", endDate)
.getResultList();
}
}
我的 Controller 调用 QuizDaoImpl 的 getQuizzes(int section) 以便显示所有测验。
我的观察:完整的东西在新部署下运行良好,一旦数据库长期处于理想状态,6-8 小时后就会出现问题
root cause
org.hibernate.TransactionException: Already have an associated managed connection
org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:65)
org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)
org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1309)
org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:57)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.enlistInCurrentTransaction(ExtendedEntityManagerCreator.java:421)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.doJoinTransaction(ExtendedEntityManagerCreator.java:398)
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:356)
sun.proxy.$Proxy150.createQuery(Unknown Source)
com.next.persistence.QuizDaoImpl.getQuizzes(QuizDaoImpl.java:102)
sun.reflect.GeneratedMethodAccessor358.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
sun.proxy.$Proxy163.getQuizzes(Unknown Source)
com.next.service.QuizServiceImpl.getQuizzes(QuizServiceImpl.java:92)
sun.reflect.GeneratedMethodAccessor357.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
sun.proxy.$Proxy164.getQuizzes(Unknown Source)
com.next.mvc.HomeController.showListPage(HomeController.java:308)
sun.reflect.GeneratedMethodAccessor356.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:146)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
最佳答案
问题出在@PersistenceContext 注释中。我有:
@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager entityManager;
我用 :
代替了它@PersistenceContext
private EntityManager entityManager;
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