Java org.apache.struts2.json.JSONException:org.hibernate.LazyInitializationException:延迟初始化集合失败
我正在从jspJava org.apache.struts2.json.JSONException:org.hibernate.LazyInitializationException:延迟初始化集合失败,java,json,hibernate,struts2,lazy-initialization,Java,Json,Hibernate,Struts2,Lazy Initialization,我正在从jspurl调用autocomplete:“ProductByName”。 在控制台中显示响应时 POST http://localhost:8082/Store/SingleProduct 500 (Internal Server Error) 在jsp中 $(".name").autocomplete({ source: function(request, response) { $.aja
url调用autocomplete:“ProductByName”
。
在控制台中显示响应时
POST http://localhost:8082/Store/SingleProduct 500 (Internal Server Error)
在jsp中
$(".name").autocomplete({
source: function(request, response) {
$.ajax({
url: "ProductByName",
dataType: "json",
data: {
str: request.term,
maxRows: 5
},...
在struts.xml中
<action name="ProductByName" class="iland.productdetails.ProductDetailsAction" method="fetchByProductName">
<result type="json">
<param name="includeProperties">productList\[\d+\]\.id,
productList\[\d+\]\.name,
productList\[\d+\]\.description
</param>
<param name="excludeNullProperties">true</param>
</result>
</action>
我得到了以下例外
SEVERE: Exception occurred during processing request: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: iland.hbm.Client.billDetailses, no session or session was closed
org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: iland.hbm.Client.billDetailses, no session or session was closed
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
at org.apache.struts2.json.JSONWriter.write(JSONWriter.java:102)
at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:116)
at org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:197)
at org.apache.struts2.json.JSONResult.execute(JSONResult.java:171)
at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:371)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:275)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:239)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:252)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:161)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:563)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.struts2.json.JSONException: org.apache.struts2.json.JSONException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: iland.hbm.Client.billDetailses, no session or session was closed
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
... 71 more
Caused by: org.apache.struts2.json.JSONException: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: iland.hbm.Client.billDetailses, no session or session was closed
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:246)
at org.apache.struts2.json.JSONWriter.processCustom(JSONWriter.java:178)
at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:168)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:134)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
... 76 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: iland.hbm.Client.billDetailses, no session or session was closed
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:111)
at org.hibernate.collection.PersistentSet.equals(PersistentSet.java:429)
at java.util.Vector.indexOf(Vector.java:408)
at java.util.Vector.contains(Vector.java:367)
at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:117)
at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:390)
at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:231)
... 81 more
编辑:fetchByProductName(getName())方法只包含Jdbc代码。那为什么要休眠错误呢
我从数据库中提取日期,并在控制台上打印。在成功之前,我给出了System.out.println(
In-action)代码>这也是正确打印
它不必访问数据库中的数据,那么为什么无法延迟初始化XXX的集合
如何解决这个问题
编辑
public class ProductDetailsBusiness {
ProductDetailsAction pda = null;
PreparedStatement ps = null;
ResultSet rs = null, res = null;
Connection con = null;
String status = null;
ArrayList<ProductDetailsAction> ar = null;
public Map fetchByProductName(String name, long cid) {
System.out.println(" ProductBusiness fetchByProductName()");
status = "success";
System.out.println("Name is " + name);
ar = new ArrayList();
con = ConnectionFactory.getConnection();
try {
String query = "select * from product "
+ "where status=? and cid=? "
+ "order by add_date";
ps = con.prepareStatement(query);
ps.setString(1, "active");
ps.setLong(2, cid);
System.out.println("Before execution");
res = ps.executeQuery();
System.out.println("Details are");
while (res.next()) {
pda = new ProductDetailsAction();
long id1 = res.getLong("id");
String barCode = res.getString("barcode");
String name1 = res.getString("name");
String desc = res.getString("description");
long quntity = res.getLong("quntity");
float unit_price = res.getLong("unit_price");
float selling_price = res.getLong("selling_price");
int discount_percent = res.getInt("discount_percent");
pda.setId(id1);
pda.setBarCode(barCode);
pda.setName(name1);
pda.setDesc(desc);
pda.setQuantity(quntity);
pda.setUnitPrice(unit_price);
pda.setSellingPrice(selling_price);
pda.setDiscountPercentage(discount_percent);
System.out.println("id "+id1+" name "+name1+" "+desc);
ar.add(pda);
}
con.close();
} catch (SQLException s) {
status = "failure";
System.out.println("SQL code does not execute." + s);
} finally {
try {
if (con != null) {
con.close();
}
} catch (SQLException sqe) {
status = "failure";
System.out.println("SQLException " + sqe);
}
}
Map m = new HashMap();
m.put("status", status);
m.put("list", ar);
return m;
}
//other methods
}
公共类产品详细信息业务{
ProductDetailsAction pda=null;
PreparedStatement ps=null;
结果集rs=null,res=null;
连接con=null;
字符串状态=空;
ArrayList ar=null;
公共映射fetchByProductName(字符串名称,长cid){
System.out.println(“ProductBusiness fetchByProductName()”;
status=“success”;
System.out.println(“名称为”+Name);
ar=新的ArrayList();
con=ConnectionFactory.getConnection();
试一试{
String query=“从产品中选择*
+“其中状态=?和cid=?”
+“按添加日期订购”;
ps=合同准备陈述(查询);
ps.setString(1,“激活”);
ps.setLong(2,cid);
System.out.println(“执行前”);
res=ps.executeQuery();
System.out.println(“详细信息为”);
while(res.next()){
pda=新产品详细信息操作();
long id1=res.getLong(“id”);
字符串条形码=res.getString(“条形码”);
字符串名称1=res.getString(“名称”);
String desc=res.getString(“说明”);
长质量=res.getLong(“质量”);
浮动单价=res.getLong(“单价”);
浮动销售价格=res.getLong(“销售价格”);
整数折扣百分比=res.getInt(“折扣百分比”);
pda.setId(id1);
pda.setBarCode(条形码);
pda.setName(name1);
pda.setDesc(desc);
pda.设定数量(数量);
pda.设定单价(单价);
pda.设定销售价格(销售价格);
pda.设置折扣百分比(折扣百分比);
System.out.println(“id”+id1+“name”+name1+“”+desc);
ar.add(pda);
}
con.close();
}捕获(SQLS异常){
status=“失败”;
System.out.println(“SQL代码不执行。”+s);
}最后{
试一试{
如果(con!=null){
con.close();
}
}捕获(SQLException sqe){
status=“失败”;
System.out.println(“SQLException”+sqe);
}
}
Map m=新的HashMap();
m、 放置(“状态”,状态);
m、 put(“列表”,ar);
返回m;
}
//其他方法
}
同时更新了action类,请注意它是这个问题的根本原因,当Struts 2 json插件尝试序列化您的productList
对象时会引发这个问题。根据例外文件
(它)表示对会话上下文之外的未蚀刻数据的访问。
例如,当访问未初始化的代理或集合时
会议结束后
这意味着您正试图从数据库访问以java的hibernate代理形式加载的BillDetails
实体的集合。根据hibernate
如果在会话范围之外访问未初始化的集合或代理,即当拥有集合或具有代理引用的实体处于分离状态时,Hibernate将引发LazyInitializationException
因此,这意味着list
未初始化billDetails
的集合,您可以在完成操作之前强制初始化这些集合
使用
在集合映射上设置FetchType.EAGER
也可以解决这个问题,但它会直接添加到billDetailses
对象中,因为每次用java加载这个对象时,它的集合都会被强制加载,从我的角度来看,这就像购买法拉利并始终在一档运行一样
如果您经常遇到LazyInitializationException
,我建议您尝试使用它来保持您的hibernate会话从请求开始一直打开,直到应用程序的响应完成。JSON的序列化过程由JSON结果控制,JSON结果是您在项目中使用的结果的一部分。您已经知道,要限制序列化程序使用的属性,应该使用json
结果的includeproperty
。还有一个root
属性需要检查。如果未指定,json结果默认使用值堆栈的top
对象。如果动作是模型驱动的,则模型将覆盖动作。因此,在includeproperty
中使用的正则表达式应用于模型对象,而序列化程序JSONWriter
使用BeanInfo
提取bean的属性。首先,检查这些属性是否存在@JSON
注释,如果它有serialize=false
,则跳过它,否则将包含它。这样,您可以通过在不序列化为JSON的属性(如@OneToMany
属性等)上添加注释来控制序列化过程。然后检查includeProperties
或excludeProperties
是否为空。这个时候你
public class ProductDetailsBusiness {
ProductDetailsAction pda = null;
PreparedStatement ps = null;
ResultSet rs = null, res = null;
Connection con = null;
String status = null;
ArrayList<ProductDetailsAction> ar = null;
public Map fetchByProductName(String name, long cid) {
System.out.println(" ProductBusiness fetchByProductName()");
status = "success";
System.out.println("Name is " + name);
ar = new ArrayList();
con = ConnectionFactory.getConnection();
try {
String query = "select * from product "
+ "where status=? and cid=? "
+ "order by add_date";
ps = con.prepareStatement(query);
ps.setString(1, "active");
ps.setLong(2, cid);
System.out.println("Before execution");
res = ps.executeQuery();
System.out.println("Details are");
while (res.next()) {
pda = new ProductDetailsAction();
long id1 = res.getLong("id");
String barCode = res.getString("barcode");
String name1 = res.getString("name");
String desc = res.getString("description");
long quntity = res.getLong("quntity");
float unit_price = res.getLong("unit_price");
float selling_price = res.getLong("selling_price");
int discount_percent = res.getInt("discount_percent");
pda.setId(id1);
pda.setBarCode(barCode);
pda.setName(name1);
pda.setDesc(desc);
pda.setQuantity(quntity);
pda.setUnitPrice(unit_price);
pda.setSellingPrice(selling_price);
pda.setDiscountPercentage(discount_percent);
System.out.println("id "+id1+" name "+name1+" "+desc);
ar.add(pda);
}
con.close();
} catch (SQLException s) {
status = "failure";
System.out.println("SQL code does not execute." + s);
} finally {
try {
if (con != null) {
con.close();
}
} catch (SQLException sqe) {
status = "failure";
System.out.println("SQLException " + sqe);
}
}
Map m = new HashMap();
m.put("status", status);
m.put("list", ar);
return m;
}
//other methods
}
Hibernate.initialize(data) // collection entity