如何解决JPA实体序列化需要实体管理器，延迟加载不应成为问题
|| 我不知何故收到了“会话已关闭”异常。序列化由hibernate支持的JSON的JPA2实体时。 我可以理解是否涉及到延迟加载，但是没有联接列。 进一步，将对象序列化为JSON的工具允许包含和排除参数，您只需明确声明对象的哪些部分将被序列化或将不会被序列化即可。如果我手动包含对象的所有属性，则序列化将起作用。但是，这非常繁琐，我应该可以说出“ objectName。* \”并将其递归序列化。 唯一有意义的是，该对象某种程度上具有某种可调用休眠实体管理器的属性，但不是类上的可见属性之一吗？ Struts2打印出跟随错误：Struts Problem Report
Struts has detected an unhandled exception:
Messages:
Session is closed!
java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: java.lang.reflect.InvocationTargetException
File: org/hibernate/impl/AbstractSessionImpl.java
org.hibernate.SessionException: Session is closed!
org.hibernate.impl.AbstractSessionImpl.errorIfClosed(AbstractSessionImpl.java:72)
org.hibernate.impl.SessionImpl.getJDBCContext(SessionImpl.java:2000)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:234)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:164)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:130)
org.apache.struts2.json.JSONWriter.add(JSONWriter.java:336)
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:235)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:164)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:130)
org.apache.struts2.json.JSONWriter.add(JSONWriter.java:336)
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:235)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:164)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:130)
org.apache.struts2.json.JSONWriter.add(JSONWriter.java:336)
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:235)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:164)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:130)
org.apache.struts2.json.JSONWriter.write(JSONWriter.java:98)
org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:112)
org.apache.struts2.json.JSONResult.execute(JSONResult.java:198)
com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)
com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)
org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)
com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)
com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)
com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)
com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)
com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)
com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
com.sun.grizzly.ContextTask.run(ContextTask.java:71)
com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
java.lang.Thread.run(Thread.java:619)
/*
* To change this template,choose Tools | Templates
* and open the template in the editor.
*/
package com.aerose.mz.db.co05in;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import javax.xml.bind.annotation.XmlRootElement;
/**
*
* @author ken
*/
@Entity
@Table(name = \"INTBLMST\")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = \"Intblmst.findAll\",query = \"SELECT i FROM Intblmst i\"),@NamedQuery(name = \"Intblmst.findByTblid\",query = \"SELECT i FROM Intblmst i WHERE i.intblmstPK.tblid = :tblid\"),@NamedQuery(name = \"Intblmst.findByTblcd\",query = \"SELECT i FROM Intblmst i WHERE i.intblmstPK.tblcd = :tblcd\"),@NamedQuery(name = \"Intblmst.findByTblsta\",query = \"SELECT i FROM Intblmst i WHERE i.tblsta = :tblsta\"),@NamedQuery(name = \"Intblmst.findByTblds1\",query = \"SELECT i FROM Intblmst i WHERE i.tblds1 = :tblds1\"),@NamedQuery(name = \"Intblmst.findByTblds2\",query = \"SELECT i FROM Intblmst i WHERE i.tblds2 = :tblds2\"),@NamedQuery(name = \"Intblmst.findByTblamt\",query = \"SELECT i FROM Intblmst i WHERE i.tblamt = :tblamt\"),@NamedQuery(name = \"Intblmst.findByTblfg1\",query = \"SELECT i FROM Intblmst i WHERE i.tblfg1 = :tblfg1\"),@NamedQuery(name = \"Intblmst.findByTblfg2\",query = \"SELECT i FROM Intblmst i WHERE i.tblfg2 = :tblfg2\"),@NamedQuery(name = \"Intblmst.findByTblfg3\",query = \"SELECT i FROM Intblmst i WHERE i.tblfg3 = :tblfg3\"),@NamedQuery(name = \"Intblmst.findByTblecn\",query = \"SELECT i FROM Intblmst i WHERE i.tblecn = :tblecn\"),@NamedQuery(name = \"Intblmst.findByTbledt\",query = \"SELECT i FROM Intblmst i WHERE i.tbledt = :tbledt\"),@NamedQuery(name = \"Intblmst.findByTblacn\",query = \"SELECT i FROM Intblmst i WHERE i.tblacn = :tblacn\"),@NamedQuery(name = \"Intblmst.findByTbladt\",query = \"SELECT i FROM Intblmst i WHERE i.tbladt = :tbladt\"),@NamedQuery(name = \"Intblmst.findByTblaus\",query = \"SELECT i FROM Intblmst i WHERE i.tblaus = :tblaus\"),@NamedQuery(name = \"Intblmst.findByTblmcn\",query = \"SELECT i FROM Intblmst i WHERE i.tblmcn = :tblmcn\"),@NamedQuery(name = \"Intblmst.findByTblmdt\",query = \"SELECT i FROM Intblmst i WHERE i.tblmdt = :tblmdt\"),@NamedQuery(name = \"Intblmst.findByTblmus\",query = \"SELECT i FROM Intblmst i WHERE i.tblmus = :tblmus\"),@NamedQuery(name = \"Intblmst.findByAdded\",query = \"SELECT i FROM Intblmst i WHERE i.added = :added\"),@NamedQuery(name = \"Intblmst.findByModified\",query = \"SELECT i FROM Intblmst i WHERE i.modified = :modified\")})
public class Intblmst implements Serializable {
private static final long serialVersionUID = 1L;
@EmbeddedId
protected IntblmstPK intblmstPK;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLSTA\",nullable = false)
private char tblsta;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 60)
@Column(name = \"TBLDS1\",nullable = false,length = 60)
private String tblds1;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 25)
@Column(name = \"TBLDS2\",length = 25)
private String tblds2;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLAMT\",nullable = false)
private long tblamt;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLFG1\",nullable = false)
@Size(max = 1)
private String tblfg1;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 5)
@Column(name = \"TBLFG2\",length = 5)
private String tblfg2;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 10)
@Column(name = \"TBLFG3\",length = 10)
private String tblfg3;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLECN\",nullable = false)
private long tblecn;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLEDT\",nullable = false)
private long tbledt;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLACN\",nullable = false)
private long tblacn;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLADT\",nullable = false)
private long tbladt;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 10)
@Column(name = \"TBLAUS\",length = 10)
private String tblaus;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLMCN\",nullable = false)
private long tblmcn;
@Basic(optional = false)
@NotNull
@Column(name = \"TBLMDT\",nullable = false)
private long tblmdt;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 10)
@Column(name = \"TBLMUS\",length = 10)
private String tblmus;
@Column(name = \"Added\")
@Temporal(TemporalType.TIMESTAMP)
private Date added;
@Column(name = \"Modified\")
@Temporal(TemporalType.TIMESTAMP)
private Date modified;
public Intblmst() {
}
public Intblmst(IntblmstPK intblmstPK) {
this.intblmstPK = intblmstPK;
}
public Intblmst(IntblmstPK intblmstPK,char tblsta,String tblds1,String tblds2,long tblamt,String tblfg1,String tblfg2,String tblfg3,long tblecn,long tbledt,long tblacn,long tbladt,String tblaus,long tblmcn,long tblmdt,String tblmus) {
this.intblmstPK = intblmstPK;
this.tblsta = tblsta;
this.tblds1 = tblds1;
this.tblds2 = tblds2;
this.tblamt = tblamt;
this.tblfg1 = tblfg1;
this.tblfg2 = tblfg2;
this.tblfg3 = tblfg3;
this.tblecn = tblecn;
this.tbledt = tbledt;
this.tblacn = tblacn;
this.tbladt = tbladt;
this.tblaus = tblaus;
this.tblmcn = tblmcn;
this.tblmdt = tblmdt;
this.tblmus = tblmus;
}
public Intblmst(String tblid,String tblcd) {
this.intblmstPK = new IntblmstPK(tblid,tblcd);
}
public IntblmstPK getIntblmstPK() {
return intblmstPK;
}
public void setIntblmstPK(IntblmstPK intblmstPK) {
this.intblmstPK = intblmstPK;
}
public char getTblsta() {
return tblsta;
}
public void setTblsta(char tblsta) {
this.tblsta = tblsta;
}
public String getTblds1() {
return tblds1;
}
public void setTblds1(String tblds1) {
this.tblds1 = tblds1;
}
public String getTblds2() {
return tblds2;
}
public void setTblds2(String tblds2) {
this.tblds2 = tblds2;
}
public long getTblamt() {
return tblamt;
}
public void setTblamt(long tblamt) {
this.tblamt = tblamt;
}
public String getTblfg1() {
return tblfg1;
}
public void setTblfg1(String tblfg1) {
this.tblfg1 = tblfg1;
}
public String getTblfg2() {
return tblfg2;
}
public void setTblfg2(String tblfg2) {
this.tblfg2 = tblfg2;
}
public String getTblfg3() {
return tblfg3;
}
public void setTblfg3(String tblfg3) {
this.tblfg3 = tblfg3;
}
public long getTblecn() {
return tblecn;
}
public void setTblecn(long tblecn) {
this.tblecn = tblecn;
}
public long getTbledt() {
return tbledt;
}
public void setTbledt(long tbledt) {
this.tbledt = tbledt;
}
public long getTblacn() {
return tblacn;
}
public void setTblacn(long tblacn) {
this.tblacn = tblacn;
}
public long getTbladt() {
return tbladt;
}
public void setTbladt(long tbladt) {
this.tbladt = tbladt;
}
public String getTblaus() {
return tblaus;
}
public void setTblaus(String tblaus) {
this.tblaus = tblaus;
}
public long getTblmcn() {
return tblmcn;
}
public void setTblmcn(long tblmcn) {
this.tblmcn = tblmcn;
}
public long getTblmdt() {
return tblmdt;
}
public void setTblmdt(long tblmdt) {
this.tblmdt = tblmdt;
}
public String getTblmus() {
return tblmus;
}
public void setTblmus(String tblmus) {
this.tblmus = tblmus;
}
public Date getAdded() {
return added;
}
public void setAdded(Date added) {
this.added = added;
}
public Date getModified() {
return modified;
}
public void setModified(Date modified) {
this.modified = modified;
}
@Override
public int hashCode() {
int hash = 0;
hash += (intblmstPK != null ? intblmstPK.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won\'t work in the case the id fields are not set
if (!(object instanceof Intblmst)) {
return false;
}
Intblmst other = (Intblmst) object;
if ((this.intblmstPK == null && other.intblmstPK != null) || (this.intblmstPK != null && !this.intblmstPK.equals(other.intblmstPK))) {
return false;
}
return true;
}
@Override
public String toString() {
return \"com.aerose.mz.db.co05in.Intblmst[ intblmstPK=\" + intblmstPK + \" ]\";
}
}
/*
* To change this template,choose Tools | Templates
* and open the template in the editor.
*/
package com.aerose.mz.db.co05in;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Embeddable;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
/**
*
* @author ken
*/
@Embeddable
public class IntblmstPK implements Serializable {
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 5)
@Column(name = \"TBLID\",length = 5)
private String tblid;
@Basic(optional = false)
@NotNull
@Size(min = 1,max = 8)
@Column(name = \"TBLCD\",length = 8)
private String tblcd;
public IntblmstPK() {
}
public IntblmstPK(String tblid,String tblcd) {
this.tblid = tblid;
this.tblcd = tblcd;
}
public String getTblid() {
return tblid;
}
public void setTblid(String tblid) {
this.tblid = tblid;
}
public String getTblcd() {
return tblcd;
}
public void setTblcd(String tblcd) {
this.tblcd = tblcd;
}
@Override
public int hashCode() {
int hash = 0;
hash += (tblid != null ? tblid.hashCode() : 0);
hash += (tblcd != null ? tblcd.hashCode() : 0);
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won\'t work in the case the id fields are not set
if (!(object instanceof IntblmstPK)) {
return false;
}
IntblmstPK other = (IntblmstPK) object;
if ((this.tblid == null && other.tblid != null) || (this.tblid != null && !this.tblid.equals(other.tblid))) {
return false;
}
if ((this.tblcd == null && other.tblcd != null) || (this.tblcd != null && !this.tblcd.equals(other.tblcd))) {
return false;
}
return true;
}
@Override
public String toString() {
return \"com.aerose.mz.db.co05in.IntblmstPK[ tblid=\" + tblid + \",tblcd=\" + tblcd + \" ]\";
}
}
解决方法
看起来JSON序列化程序遇到了一个惰性代理，并尝试对通过调用
HibernateProxy.getHibernateLazyInitializer()
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