but if you use join query it is going to duplicate your result ofc so you . [FIXED] Could not write JSON: failed to lazily initialize a collection I found out that declaring @PersistenceContext as EXTENDED also solves this problem: To solve the problem in my case it was just missing this line. Initial fetch mode for collections is set to FetchMode.LAZY to provide performance, but when I need the data, I just add that line and enjoy the fully populated objects. You should UPPERCASE that the BEST SOLUTION IS 1 in fact is the ONLY GOOD solution since all others are anti-patterns! I've changed my service a bit to get model from database in the same transaction: Thanks for contributing an answer to Stack Overflow! Problem with: 'Could not write JSON: failed to lazily initialize a By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. This method takes the collection as an argument and initializes it. Simply put, a single Java or Kotlin developer can now quickly Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Did COVID-19 come to Italy months before the pandemic was declared? But this should be done in the Spring layer. (1) worked for me perfectly. So the question is whether you want to be stateless or not. You can do it within your production code of course, but you should avoid to make your test methods transactional. I went with Hibernate.initialize(myModel.getRelatedCollection()); which worked fine, I don't know if I use the transaction etc. Put the following as the first statement of your updateUser () service method. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thats all about Failed to lazily initialize a collection of role could not initialize proxy no Session. allocate them, calculate burn rates for projects, spot anomalies or this way the JPA session will be open a bit longer and because of that properly. . That's said, it can depend on your actual use case. Note In pom.xml we have defined javac.exe path in configuration tag. Is there a way to sync file naming across environments? Try to merge and perform operations on a merge instance: So as @Maciej Kowalski mentioned after first @Transactional read of my model it's already in deatached state and call to get entities from another @Transactional method failed with LazyInitializationException. Why is JPS session closed? xxx.entity.core.User.roleSet, no Otherwise you would not be able to test the correct transactionhandling of your productioncode. This is the case for me. Difference between FetchType LAZY and EAGER in Java Persistence API? This problem is more structural since even if you turn off. When did a Prime Minister last miss two, consecutive Prime Minister's Questions? So, I've changed the 'LinkedHashSet' type t the 'PersistentList'. we removed these annotations from our service layer methods and added them to the repository. failed to lazily initialize a collection of role @Transactional and As a result, when you iterator through the applications, the session was closed, so it can't load the actual contents of the collection. We need to define spring.jpa.properties.hibernate.enable_lazy_load_no_trans=true in applcation.properties file. at I hope this helps! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. at at @Transactional at the controller level is the workaround I've used, but after reading the comments I move the annoation to the service layer. It is my professional advice to avoid the proposed solution and consider it as a bad practice, and I pointed to a very clear explanation of why. Full-blown entity with all collections mapped as, Simplified entity with most or all collections trimmed out. look at this post. How to maximize the monthly 1:1 meeting with my boss? now if i access 'set' after closing session it throws exception. Lets have a quick look into throwLazyInitializationException(). collection of role: Is the difference between additive groups and multiplicative groups just a matter of notation? The controller, which calls model looks like the following: Exception is rised, when viewing jsp. First story to suggest some successor to steam power? The @Transactional annotation worked for me, but note that Propagation.REQUIRED is the default, at least in Spring Boot 1.4.2 (Spring 4.3). take you from designing the DB with your team all the way to java.lang.reflect.Method.invoke(Method.java:597) Is the difference between additive groups and multiplicative groups just a matter of notation? : Move this line to the TopicService.findTopicByID method: Collection commentList = topicById.getComments(); Use 'eager' instead of 'lazy'. In my case the @Transactional annotation solved it. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) but in case if we want lazy then this solution will not work and most of the cases we want lazy only. To learn more, see our tips on writing great answers. Asking for help, clarification, or responding to other answers. And finally, we have an application.properties file where we have database details. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. at Here entityListKeeper has List of Entity that has list of LazyLoadedEntity. You can avoid this problem by accessing the lazy collection within a transaction. Do large language models know what they are talking about? Any recommendation? If you are trying to have a relation between a entity and a Collection or a List of java objects (for example Long type), it would like something like this: I got this error after a second execution of a method to generate a JWT token. First, let's define a HibernateUtil class to create a SessionFactory with configuration. org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197). Here you will check lazily initialized properties and setting null to those. rev2023.7.5.43524. spring, hibernate: failed to lazily initialize a collection Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing. I know it's an old question but I want to help. The line user.getUsersRole().stream().forEachOrdered((ur) -> roles.add(ur.getRoleId())); generated the error. JPA/Hibernate and Failed to Lazily Initialize a Collection Wayne Woodrow Ranch Hand Posts: 44 posted 4 days ago Hello, After some reading and looking at examples this is still blowing my pea brain and I don't know what specifically to do to fix this. Why use @Transactional with @Service instead of with @Controller, failed to lazily initialize a collection of role, org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role (Hibernate + Spring). Use Hibernate.initialize() to initialize the collection: You can use the Hibernate.initialize() method to initialize the collection before the Session is closed. Should X, if theres no evidence for X, be given a non zero probability? For example calling. I agree with @Rafael the only solution is the first. The other way to handle this is to collect all the data you need in your controller, close your session, and then stuff the data into your model. Hibernate: failed to lazily initialize a collection of role, no session or session was closed, http://khuevu.github.io/2013/01/20/understand-hibernate.html, khuevu.github.io/2013/01/20/understand-hibernate.html, khuevu.github.io/application-design-with-hibernate.html, http://www.javacodegeeks.com/2012/07/four-solutions-to-lazyinitializationexc_05.html. It seem like its taking us back to old good plain SQL days :), Read this: http://www.javacodegeeks.com/2012/07/four-solutions-to-lazyinitializationexc_05.html. In the above code, we are calling getStory() method just before closing the session. Developers use AI tools, they just dont trust them (Ep. This is a bad bad bad solution. Making statements based on opinion; back them up with references or personal experience. The only time I would want to use EAGER is if it is the inverse of this and that only means one row (provided this does not eagerly load something else which loads something else). [Solved]-How to fix Hibernate LazyInitializationException: failed to Which means that you restrict loading the comments to only those methods (queries) which really require that. so Transactional annotation is not missing. For example, consider we have two entities in OneToMany relation as below. In this quick tutorial, we'll take a closer look at the root cause of the error and learn how to avoid it. Please help me if u can. PI cutting 2/3 of stipend without notice. at I think, in your specific case, a collection of role is probably quite small and suitable to use eager fetching. I can't find a solution. Do large language models know what they are talking about? spikes, and get insightful reports you can share with your I've used the pre-fetch strategy, but I have also found it effective to provide two entities: Common fields and be mapped in @MappedSuperclass and extended by both entity implementations. If you don't want to accept that explanation because it doesn't comes from Spring, that's your decision. Certainly if you always need the collections loaded, then there is no reason to not to EAGER load them. Can the type 3 SS be obtained using the ANOVA function or an adaptation that is readily available in Mathematica, international train travel in Europe for European citizens.