lazy 1 « Load « JPA Q&A
1. hibernate Lazy loading stackoverflow.commy hibernate object A has object B, C, and D as properties : |
2. Lazy loading stackoverflow.comIs there a scenario where eager loading is preferred over lazy loading? |
3. What is lazy loading in Hibernate? stackoverflow.comWhat is lazy loading in Java? I don't understand the process. Can anybody help me to understand the process of lazy loading? |
4. how to implement lazy loading in hibernate stackoverflow.comI have 3 tables with mapping CompanyRegistration ... |
5. hibernate and selective lazy loading stackoverflow.comi have the following class structure mapped to my database, note in my diagram b is a one to many child of A, etc. |
6. JPA2/Hibernate - Stop lazy loading? stackoverflow.comI'm having a problem where JPA is trying to lazily load my data when I don't want it to. Essentially what is happening is I'm using a Service to retrieve some ... |
7. Hibernate lazy loading not working stackoverflow.comI'm using version 3.6.1.Final I have the following property in my entity bean |
8. For java developers, what is better than Hibernate? stackoverflow.comI am unsure if there is a better way to develop database-backed applications in Java, but I thought I would ask. There is a lot I like about Hibernate, but there are ... |
9. Defining scope for lazy loading (hibernate) stackoverflow.comFor lazy loading, hibernate makes proxies. For lazy=true (that is also the default), I want my data access layer and business layer to use this feature. But once the loaded data ... |
10. Hibernate/JPA equals() and hashCode() with Lazy loaded Business Identifier stackoverflow.comI'm wondering how to write a correct equals() and hashCode() for Hibernate Entities which have a Lazy Loaded ManyToOne relation to another Entity which is important as a business key. Note, ... |
11. Hibernate Lazy-loading performing differently stackoverflow.comI am running into problems when porting an application that uses Hibernate between machines. The two machines have exactly the same jars and are running very close to the same version ... |
12. Lazy loading in JPA stackoverflow.comAll, is it possible to specify that the entity classes mentioned in persistence.xml be lazily loaded? I have some 300 odd entity classes and I want to specify in the persistence xml that ... |
13. Are you able to prove the Hibernate Lazy-Loading? stackoverflow.comI just want to ask, how to prove that hibernate is doing lazy loading .
I have code like this :
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14. Hibernate : preventing large dataloads without lazy loading coderanch.comHi, I am relatively new to Hibernate (brilliant software - my thanks to its creators). Currently I am trying to have my cake and eat it - and am asking if there a pattern that would allow me to do so. My problem is that I have two entity types - customer and contact. Each can reference any number of the ... |
15. Hibernate Lazy Loading coderanch.comIs there a way to turn off lazy loading for one class? I have a class that I almost always use with another class. So I want to have hibernate to load them both at the same time. But I don't need to do this with every object, just these two classes. So far I've only found information on how to ... |
16. How lazy loading is working in JPA coderanch.comHi, I have one doubt regarding Laxy loading of the objects in JPA. Let us suppose i have one entity Class A. A is mapped with one to many with B and B is mapped with C as Many to one. Below is sample class struture. A { @OneToMany(FetchType=Lazy) private List blist; } Class B public class B { @oneToMany(FetchType=Lazy) private ... |
17. "Empty" PersistenceContext during Lazy Loading forum.hibernate.orgHi to all! I'm implementing Remote Lazy Loading in my client/server application. The server part is powered by the combination of OSGi, Hibernate and Spring. I've followed the following examples to implement this mechanism http://www.theserverside.com/tt/articles/article.tss?l=RemoteLazyLoadinginHibernate https://www.hibernate.org/377.html?cmd=prntdoc The problem is that when I invoke the remote service, I use the following code which throws the indicated exception. Code: return getHibernateTemplate().execute(new HibernateCallback() { ... |
18. Lazy Load between web requests forum.hibernate.orgI have an entity called User that has several lazy loaded property relationships with other entities. I am using the OpenEntityManagerInView class in order to bind the hibernate session when each request comes into Struts2/Spring2. The problem I am encountering is that during the login process, the User entity is queried but not fully populated because the additional relationships are not ... |
19. Lazy Loading change proposal forum.hibernate.orgHello, welcome everybody this is my first post on the forum, so if I do something wrong, don't kill me ;) I have little proposal for lazy loading: Suppose I have entity @Entity Public class Boss { private Long id; private @ManyToOne() Company company; } and I try to load Boss entity by primary key form DB: Sesion s = ; ... |
20. Lazy loading does not work as advertised forum.hibernate.orgAuthor Message pauln Post subject: Lazy loading does not work as advertised Posted: Sat Jan 02, 2010 11:45 pm Beginner Joined: Tue Oct 28, 2008 6:41 pm Posts: 20 I have a very large query that returns 1000 objects (called Fielding) .Each Fielding object has a single Master object. My domain Fielding object has the Master object set as ... |
21. determining lazy loading at run time forum.hibernate.orgHi All, I was wondering if there is a way to dynamically determine if an object should be lazy loaded at run time? So basically I have an entity relation ship such as : A Contains B A Contains C So depending on the business logic I am executing sometimes I want to eager load B and lazy load C and ... |
22. lazy loading forum.hibernate.orgHi All, I am new to hibernate. When I went through some tutorial i got the concept lazy loading. So what I have understood about lazyloading is, in hibernate by default lazy loading is true. That means when parent class is loaded,it will not load the child class. Am i right? If it is right then I have the following scenario. ... |
23. Lazy loading forum.hibernate.orgAuthor Message deiii Post subject: Lazy loading Posted: Mon Jul 05, 2010 11:26 am Newbie Joined: Mon Jul 05, 2010 11:06 am Posts: 1 Short description: We use org.springframework.orm.hibernate3.support.OpenSessionInViewFilter for dont have any problem with lazy loading in web layer. All work and all ok but some time ago we receive strange exception which not reproduced now but we ... |
24. Lazy Loading with many-to-one forum.hibernate.orgHi takashi, didnt you get any error by giving lazy="proxy"??? for many to one.... i didnt try for associations up 2 now....please reply me for your way of doing....... as per i know........the way of doing is...... there is no reason to brig in the entire collection when u only want to look at a few elements.you can help hibernate by ... |
25. buildtime bytecode instrumentation for lazy loading forum.hibernate.orgHi, I'm trying to implement lazy property loading, but according to the documentation, I need to buildtime bytecode instrumentation. I've tried multiple tutorials on it from around the internet and can't seem to get it to work. I've tried using Ant Tasks and Maven Pom, but I couldn't get either. I'm guessing that I'm missing something simple, but if someone could ... |
26. Lazy loading forum.hibernate.orgI have a technical problem with the lazy loading of Hibernate in combination with a many-to-one mapping. In my domain model i have the following class Person private PersonType type; My mapping looks like this |
27. Set not initialised on lazy loading forum.hibernate.orgHi, new here hope i achieve a lot :) ... I have two objects [Basket,Product] ... i use ManyToMany annotation mapping.. My Basket class is as follows ... Code: @Entity @Table(name = "BASKET") @SequenceGenerator(name = "sq_basket",sequenceName = "BASKET_SEQ_ID", initialValue=1) public class Basket implements java.io.Serializable { // Fields @Id @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="sq_basket") ... |
28. Lazy loading not working as expected forum.hibernate.orgI am making use of hibernate3 and having the following code Code: public class Event { private Long id; private String name; private Date startDate; private int duration; private Set speakers; private Set attendees; private Location location; } |
29. Can't get lazy loading to work forum.hibernate.orgI have a pattern of class use that I cannot get to lazy load. I have a class such as Document, with a list of DocumentPaths, and the DocumentPath has a reference to the Document it is for. Code: public class Document { private Date documentDate; private List |
30. Extra lazy loading and iterators forum.hibernate.org@Entity public class Wine { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE) @Column(name = "ID") private long id; @ManyToOne(fetch=FetchType.LAZY) @JoinColumn(name="WINE_ID",nullable=false,updatable=false) private Winery winery = null; private String name; ... |
31. Lazy Loading not working forum.hibernate.orgHi all, I am having some problem with lazy loading. Here is an example of my mappings @Entity public class GrandParent { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @OneToMany(mappedBy = "grandParent", cascade = { CascadeType.ALL }) @org.hibernate.annotations.Cascade({ org.hibernate.annotations.CascadeType.DELETE_ORPHAN }) private Set |
32. Hibernate3 does not lazy load by default forum.hibernate.orgHi, We have used Hibernate 3 with annotation based mapping. Hibernate by default does Lazy Loading on all associations. We have implemented a one-to-many relationship through a join table. The problem here is the associations are always eagerly loaded until I explicitly set fetch=FetchType.LAZY ? Is this required ? Shouldn't hibernate load it lazily by default ? Code: public class User{ ... |
33. Defining scope for lazy loading forum.hibernate.orgFor lazy loading, hibernate makes proxies. For lazy=true (that is also the default), I want my data access layer and business layer to use this feature. But once the loaded data is send to the presentation layer, i want "Null pointer exception" instead of "LazyInitializationException could not initialize proxy - no Session" if some property is accessed for the DTO/BO that ... |
34. Lazy loading feature forum.hibernate.org |
35. [SOLVED] Realization of Lazy Loading forum.hibernate.orgHello together, i'm an apprentice for application developement und currently working at my project. It's a Persistence Framework on Java. So after working with Hibernate in the past, i was wondering how Hibernate is exacly implementing lazy loading. Normally when you define a getter in a dataclass, you would just put the "FetchType.LAZY" Annotation over it and you would be good ... |
36. Lazy loading in Hibernate forum.hibernate.org |
37. transparent lazy loading forum.hibernate.orghello, appologies but i'm going to have to bring this up again in the hope that someone will have a solution or workaround. I am making a client admin app and need to display a gui tree of the data graph. i would like to enable transparent lazy loading of the data so that the presentation tier is unaware of hibernate. ... |
38. many-to-one with lazy loading forum.hibernate.orgHello everyone, Is there any way of mapping a many-to-one relationship as lazy without using a proxy for the related class? My motivation is: 1. I have a class with many many-to-one relationships 2. I usually work with only one of those at a time 3. The related classes are also used alone (e.g. I use find() and HQL to query ... |
39. Runtime configuration of lazy-loading behavior? forum.hibernate.orgWe are currently considering implementing Hibernate and are excited about it's lazy-load capabilities because it will allow our domain objects to be fully functional without having to worry about whether their relationships have been loaded. However, there are certain scenarios where we might want to do an outer join to force an object and its relationships to be loaded with a ... |
40. Lazy load on many-to-one forum.hibernate.orgIs there anyway I can lazily load a many-to-one object? In my mapping, I have 'User' class has a many-to-one to 'Organization' that has many-to-one to 'Account' and goes on. So, whenever I load the User object, there is multiple many-to-one queries being fired. At some cases, I just need the User object. How do I achieve this? Thanks |
41. Lazy loading not working forum.hibernate.orgselect prop1, prop2 ... from MainClass select prop1_1, prop1_2 ... from SubClass select prop1_1, prop1_2 ... from SubClass ... select prop2_1, prop2_2 ... from SubSubClass order by SubSubPK select prop2_1, prop2_2 ... from SubSubClass where MainPK = ? and SubPK = ? and SubSubPK = ? select prop2_1, prop2_2 ... from SubSubClass order by where MainPK = ? and SubPK ... |
42. Lazy Loading Example (in Web App) ? forum.hibernate.orgIs there a good example of using lazy loading in a web app somewhere? Essentially what I want to do is (using an example with single User has multiple contacts): find a User object without loading the contacts collection and put it into the HttpSession. Then later (in another request) get the User object from the HttpSession and get the contacts ... |
43. Lazy Load forum.hibernate.orgI am new to hibernate , could someone please let me know if there is any problem with doing the following to lazy intialize a collection in a web app . I hava a DAO In the app I get the user UserDAO.getUser(pk); Later in the app I load the roles only when I need them UserDAO.loadRoles(user); The load roles looks ... |
44. Lazy loading not working forum.hibernate.orgWith the mapping below, I always get all children objects loaded. Is there a reason that lazy-loading isn't happening? I'm using Hibernate 2.1, and I'm using session.find("from Parent as p") to load the parent. Any suggesions? -Mitch Code: |
45. many to one lazy load forum.hibernate.org |
46. Lazy loding - how to achieve optional lazy loading forum.hibernate.orgIt is possible to have lazy loading optional at runtime? I would like to have method on state less session bean (SLSB), where one parameter is: boolean lazyLoding If I set lazyLoding=false, I would like to get all object graph from method of SLSB, when I set lazyLoading=true, I would like to retrieve only "first level of data", only object with ... |
47. How to tell what's been lazily loaded, without loading more? forum.hibernate.orgWe have a new system we're developing on a JDK 1.4 app server, and we want to expose its stateless-session-bean service layer to a legacy system running JDK 1.3. Hence we can't use plain old RMI because of all kinds of horrible serialization versioning problems. "Use SOAP," you say! Hah, if only. Axis is still a big ball of hair and ... |
48. Deactivate lazy loading to parse all datas forum.hibernate.orgHi, I want to iterate all my datas (6 500 000 objects) with Hibernate, and so, I use the session.iterate("hql") function. It works but this solution is much slower than a simple SQL select (12 times). The reason is that for every object, Hibernate load the datas during the first access of one of its properties. So, there are many SQL ... |
49. lazy= "true" but not lazily loading =true forum.hibernate.org |
50. Lazy loading for many-to-one? forum.hibernate.orgHi, I would like to know if it is possible to activate lazy loading for a many-to-one association only, instead of setting lazy="true" for the entire entity. If lazy="true" is set for the entity (that appears in the many-to-one), when executing a Hibernate query, all fields of this entity will automatically be populated, if the many-to-one relationship is defined in the ... |
51. how to bypass lazy-loading configuration? forum.hibernate.org |
52. Lazy loading many-to-one assisiations forum.hibernate.orgHi, anyone knows if there is way for bidirectional associations (many-to-one-end, not-null) to use lazy loading or caching (second level or session)? I have a problem where linked models keep loading the same data over and over. Resulting in very huge SQL selects and slow performance. I could not find anything in the docs. Regards and thank you in advance for ... |
53. lazy loading archetecture forum.hibernate.org |
54. Lazy loading forum.hibernate.org[b]Hibernate version:2.3.1[/b] [b]Mapping documents: |
55. Clarification needed : OpenSessionInView + Lazy Loading forum.hibernate.orgHibernate version: 2.1.6 (and Struts 1.1, Spring 1.1) Name and version of the database you are using: mySQL Hi There, I have been trying the Spring OpenSessionInView and Lazy loading in the past few days. Would like to seek clarification from the experts here. I have tried Google the anwser but could not a clear yes or no. I think the ... |
56. Lazy defined set gets loaded forum.hibernate.orgRegular Joined: Tue Jan 27, 2004 12:22 pm Posts: 103 Problem The set with objects defined in Dossier gets initialized although lazy="true" is set. Hibernate version: 2.1.6 Mapping documents: Code: |
57. ConcurrentModificationException due to lazy loading forum.hibernate.orgNewbie Joined: Tue Nov 16, 2004 11:02 am Posts: 1 Location: Utrecht, The Netherlands Hibernate version: 2.1.6 Full stack trace of any exception that occurs: Code: Throwable java.util.ConcurrentModificationException at org.apache.commons.collections.SequencedHashMap$OrderedIterator.next(SequencedHashMap.java:795) ... |
58. Turning off lazy loading at runtime forum.hibernate.orgHibernate version: 2.1.7 Mapping documents: Code between sessionFactory.openSession() and session.close(): Full stack trace of any exception that occurs: Name and version of the database you are using: The generated SQL (show_sql=true): Debug level Hibernate log excerpt: Hi! Im working in an application with a seperate business tier. In this case the business logic must load all collections that will be needed ... |
59. Lazy Loading by default in 3 Beta? forum.hibernate.orgWhen I changed from 3 Alpha to 3 Beta all my code broke because of lLazyInitializationExceptions. I don't use lazy loading (on intention). I do have the same problem as discussed in the thread "Hibernate LazyInitializationException". I load an object, I close the session, then I want to access the attributes and get the exception. Leaving the session open solves this, ... |
60. how to set lazy loading to false programatically forum.hibernate.org |
61. Lazy load ... forum.hibernate.org |
62. Lazy loading not working and driving me nuts.. forum.hibernate.orgI am trying to load a unitCoverages (see below) collection lazily from a Unit persistent class and although it seems like all the queries are running fine etc...etc.., my objects are not being loaded. This is driving me insane. If anyone can spot the issue please let me know. All relevant code is belos Hibernate version:2.18 Mapping documents: |
63. Lazy loaded one-to-one forum.hibernate.orgAll, I just noticed that the laziness of a persistent class is tied to the class mapping, not to the association. I can't find much discussion about how this came to be, but it seems to me that one might want the lazy-load attribute on a per-association basis, not a per class basis. Is there a way to control this? -Chris ... |
64. Lazy loading in layered design forum.hibernate.org |
65. one-to-one & lazy loading forum.hibernate.orgHi there, I am dealing with a simple one-to-one association from A to B Whenever I am loading A, B gets loaded as well. I can't get lazy loading of B to work. What I am doing is: |
66. Lazy loading many-to-many forum.hibernate.orgNewbie Joined: Thu Mar 17, 2005 11:13 am Posts: 7 Hi, I have a session facade method like this: Code: public Set getUserPublishers(Long userId) { try { User user = (User) HibernateUtil.getSession() ... |
67. lazy loading forum.hibernate.org |
68. bug in hibernate lazy loading forum.hibernate.orgHi everybody. I am a very good programmer since I am a kid. But sorry, first time I worked with hibernate I discover a realy big bug. I have a table with items and a table with categories. Everytime when I try category.getItems( ) I get a lazy loading exception. And the strange thing is I only got this exception after ... |
69. Replication and Lazy Loading forum.hibernate.orgHibernate version: 3.05 I am trying to implement replication using two sessionfactory objects and I can easily move data in a single table, etc. using code similar to the reference manual. However, my actual database is a series of seven entities that are related by sequential one to many relationships. For example, a clinical trial network contains clinical sites contain different ... |
70. many-to-one lazy loading not working forum.hibernate.orgHibernate version: 3.05 w/ JBoss 4.02 I just can't seem to get my many-to-one relationship to load lazily. I've reduced it to it's most simple form but it just won't load lazily. I have code that simply looks up 10 InterviewImpl objects and just reads a string property from each one, however each time I read that property a SQL statement ... |
71. lazy loading forum.hibernate.org |
72. Lazy loading and polimorphism forum.hibernate.orgHi all, As far as I understand, instanceof and objects casting are not recommended to use with polimorphic collections, because of lazy loading proxies. Proxy Visitor pattern seems to be rather complicated. My question is: does the following simple code solve the problem? What is happening, when I call method "asA" of proxy? Does it depend from inheritance mapping type (table ... |
73. one-to-one lazy loading forum.hibernate.orgI'm trying to create a mapping file with a |
74. lazy loading not working correctly forum.hibernate.orgNewbie Joined: Fri Apr 22, 2005 3:17 am Posts: 5 Hello everyone, i have a strange phenomenon regarding refreshing and updating lazy collections. When running the testRefresh() method below everything is fine. But if you comment out the three code lines, the last line inside the try block will cause an NonUniqueObjectException. This is because the collection of Bs in A1 ... |
75. Lazy loading forum.hibernate.orgI want to know that when an object is loaded if it is defined lazy = "true", whenever it is used? or whenever its getter method is called? or else? |
76. Lazy Loading forum.hibernate.orgIs there a way to programattically changed lazy loading to full loading and viceversa? To elaborate, I have mappings in my xml file for lazy loading between a main table and n number of accessory tables. Based on certain scenarios, I would like to either load only the primary table or the primary table and all the n dependant tables. Any ... |
77. lazy loading again forum.hibernate.orgThanks for your reaction. If I had to setup a new application I would not have a problem because I would work like you suggest. I am trying to use hibernate in an existing aplication though and there are to many objects that keep state and refer eachother. If I have to implement the identifier pattern I will lose weeks if ... |
78. lazy loading - what does it do forum.hibernate.orgHi, im a hibernate starter. I get confused by the concept of lazy loading, here is my understanding, could you please correct errors or add other points if theres anything wrong. First, If a class is defined as lazy, then when an object of that class is instantiated, its instance variables that reference other classes (like foreign keys link to other ... |
79. Avoiding Automatic Dirty Checking with Lazy Loading Enabled forum.hibernate.org |
80. one-to-one and lazy loading - dont they co-exist? forum.hibernate.orgHibernate version: 3.0.5 mapping documents: |
81. one-to-one and lazy loading - dont they co-exist? forum.hibernate.orgHibernate version: 3.0.5 mapping documents: |
82. one-to-one and lazy loading - dont they co-exist? forum.hibernate.orgHibernate version: 3.0.5 mapping documents: |
83. Lazy Loading with |
84. Lazy loading in web application forum.hibernate.orgIs it possible to use lazy loading in a web application. In this case I can't close the session and I have to reconnect the session. If different people work with the web application how can the changes be forwarded to other users. My problem is that the data persisted in the mysql database can only be made visible to other ... |
85. Lazy loading again forum.hibernate.orgOk! we have partly solved the problem of lazy loading in our application, but we have something more over here. Consider a hierarchy of model objects (or value objects) as: A contains B A contains C |
86. Change in lazy loading of many-to-one with instrumentation forum.hibernate.orgAuthor Message mspaulding Post subject: Change in lazy loading of many-to-one with instrumentation Posted: Fri Aug 11, 2006 11:08 am Newbie Joined: Fri Aug 11, 2006 10:29 am Posts: 3 We are attempting to upgrade from Hibernate 3.0.5 to 3.2 and are seeing a difference in how lazy loading is handled for many-to-one relationships for classes that have been ... |
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88. hang on to lazy loading, but how? forum.hibernate.orgList teams = dao.getTeams(); for (Iterator iterator = teams.iterator(); iterator.hasNext();) { Team t = (Team) iterator.next(); Set s = t.getUsers(); for (Iterator iter2 = s.iterator(); iter2.hasNext();) { User u = (User) iter2.next(); ... ... |
89. Strange! How lazy loading impacts many-to-one? forum.hibernate.orgI think when you write select id, company from Topic in HQL, hibernate interprets it as that you want id and the Company object corresponding to each Topic and hence it joins company table and select all columns. Have a look at the result set, I am sure that it will be returning the company object instead of its id. |
90. how to plug some code just before lazy loading happens? forum.hibernate.orgHi, Is it possible to plug some code just before lazy loading of an object is going to happen? I've read about custom tuplizer/custom proxy factory. This is not what I'm looking for as I'd like to stay with CGLIB proxies. So is there a way to intercept lazy loading leaving proxies alone, i.e. intercept a moment BEFORE control is passed ... |
91. how to get rid off lazy loading in hibernate. forum.hibernate.orgHi all, By default, hibernate allows lazy loading, which is not good when we are getting the from two tables which are associted.So now i want to remove the lazy loading. I have mentioned lazy="false" in |
92. No Lazy loading with many-to-one when not-found="ignore forum.hibernate.org |
93. lazy loading forum.hibernate.orgHmm, nope, unfortunately not Code: public class GzHtml { @Id @Column( name = "url_id" ) private String urlId; @Column( name = "html" ) @NotNull private byte[] html; @OneToOne( fetch = FetchType.LAZY, cascade = CascadeType.ALL ) @PrimaryKeyJoinColumn ... |
94. what is lazy loading? forum.hibernate.orglazy loading of different types association ,class ,property lazy loading means if u r mentioning lazy='true' in class level we r not getting data of child but we get reference to child objects. if we r specify lazy='false' in class level we r getting data of child objects then performance goes down.by default lazy='true' |
95. HOW-TO: programatic lazy loading forum.hibernate.org |
96. Help/ why this behaviour when lazy loading=true forum.hibernate.org |
97. Help/ why this behaviour when lazy loading=true forum.hibernate.org |
98. 1-to-1 lazy loading forum.hibernate.org |
99. Hibernate Lazy Load not working correctly forum.hibernate.orgHey all. I couldn't find anything dealing with this topic on here yet so hopefully someone can help me out and tell me what I am doing wrong. I have four Java classes that are representations of the various entries that will be stored in the DB through Hibernate. Below is a described example of how the classes are related. "There ... |
100. lazy/non-lazy loading at runtime forum.hibernate.org |
And I try to test lazy ...