Spring的Hibernate Proxy对象序列化问题
我正在研究hibernate，并在实体对象中序列化hibernate代理对象时遇到了一个问题。
在一些SO帖子中提到使用Hibernate.initialize（ProxyObject）会起作用， 但是如果我有项目列表，那么我必须遍历所有对象并显式调用这些对象的initialize（）方法。
还有其他办法可以解决这个问题吗？
我的实体如下
实体类如下所示
public class GroupMember extends Form {
/**
*
*/
private static final long serialVersionUID = -4728285634057416148L;
private int grpmid;
private User user;
private Boolean grpownr;
private Group grp;
//Other Getter and setters
@OneToOne(targetEntity = Group.class, fetch = FetchType.LAZY)
@JoinColumn(name = "Group_GroupId", referencedColumnName = "GroupId")
public Group getGrp() {
return grp;
}
public void setGrp(Group grp) {
this.grp = grp;
}
}
我从服务方法返回时遇到的异常 - 我正在检查休息控制台。
<html><head><title>Apache Tomcat/7.0.34 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - Could not write JSON: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"])</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>Could not write JSON: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"])</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"])
2. org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:196)
3. org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
4. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)
5. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)
6. org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)
7. org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
8. org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
9. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)
10. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
11. org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
12. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
13. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
14. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
15. org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:822)
16. javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
17. org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
18. javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
19. </pre></p><p><b>root cause</b> <pre>com.fasterxml.jackson.databind.JsonMappingException: could not initialize proxy - no Session (through reference chain: com.service.responsepojo.GroupMemberResponse["grpmbr"]->com.service.pojo.GroupMember["user"]->com.service.pojo.User["dept"]->com.service.pojo.Department_$$_javassist_9["un"])
20. com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:232)
21. com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:197)
22. com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.java:183)
23. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:559)
24. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
25. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
26. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
27. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
28. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
29. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
30. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
31. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
32. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
33. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
34. com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:120)
35. com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1728)
36. org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:193)
37. org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
38. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)
39. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)
40. org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)
41. org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
42. org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
43. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)
44. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
45. org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
46. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
47. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
48. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
49. org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:822)
50. javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
51. org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
52. javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
53. </pre></p><p><b>root cause</b> <pre>org.hibernate.LazyInitializationException: could not initialize proxy - no Session
54. org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:86)
55. org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:140)
56. org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:190)
57. com.service.pojo.Department_$$_javassist_9.getUn(Department_$$_javassist_9.java)
58. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
59. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
60. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
61. java.lang.reflect.Method.invoke(Method.java:601)
62. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:653)
63. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:509)
64. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
65. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
66. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
67. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
68. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
69. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
70. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
71. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
72. com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:544)
73. com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:551)
74. com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:143)
75. com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:120)
76. com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1728)
77. org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal(MappingJackson2HttpMessageConverter.java:193)
78. org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
79. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)
80. org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)
81. org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)
82. org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
83. org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
84. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:746)
85. org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:687)
86. org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
87. org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
88. org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
89. org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:915)
90. org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:822)
91. javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
92. org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:796)
93. javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
94. </pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.34 logs.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.34</h3></body></html>
更新 - 目前我正在使用一个逻辑来使对象unproxy并将其返回给客户端，但这很昂贵，因为我必须遍历大量的项目列表
Criterion classCriterion = Restrictions.eq(“U.un",
requestForm.getUn());
Criteria criteria = sessionObject
.createCriteria(GroupMember.class, "GPM")
.createAlias("GPM.user”, “U”)
.add(classCriterion);
@SuppressWarnings("unchecked")
List<GroupMember> members = (List<GroupMember>)criteria.list();
for (GroupMember groupMember : members) {
if (groupMember.getGrp() instanceof HibernateProxy) {
groupMember.setGrp((Group) UnProxy
.initializeAndUnproxy(groupMember.getGrp()));
}
if (groupMember.getGrp().getDept() instanceof HibernateProxy) {
groupMember.getGrp().setDept((Department) UnProxy
.initializeAndUnproxy(groupMember.getGrp().getDept()));
}
if (groupMember.getUser().getDept() instanceof HibernateProxy) {
groupMember.getUser().setDept((Department) UnProxy
.initializeAndUnproxy(groupMember.getUser().getDept()));
}
}
0 个答案:
没有答案
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