JPA with Hibernate 3 - ManyToMany-Stack overflow and Multiple bag errors ------------------------------------------------------------------------ Key: HHH-5691 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5691 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.5.1 Environment: Spring 3.0.3 Hibernate-core : 3.5.1-Final Hibernate-annotations : 3.5.1-Final hibernate-common-annotations : 3.2.0-Final hibernate-entitymanager : 3.5.1-Final Mysql database Junit 4 Reporter: Suyash Kaulgud Attachments: fms-web.zip I am facing issues while retrieving data for entities having bi-directional many-to-many relationship. If I use List for storing entities, I get unable to fetch multiple bags simultaneously error. If i change my code to use Set, I get stackoverflow error. Details : Spring 3.0.3 Hibernate-core : 3.5.1-Final Hibernate-annotations : 3.5.1-Final hibernate-common-annotations : 3.2.0-Final hibernate-entitymanager : 3.5.1-Final Mysql database Junit 4 User has Many Bank Accounts; Bank Account can have many users User.java @ManyToMany(fetch = FetchType.EAGER, mappedBy="user") private List<BankAccount> bankAccounts = new ArrayList<BankAccount>(); BankAccount.java @ManyToMany(fetch = FetchType.EAGER) @JoinTable(name = "user_bankaccount", joinColumns = @JoinColumn(name="bank_account_id"), inverseJoinColumns = @JoinColumn(name = "user_id") ) private List<User> user = new ArrayList<User>(); DB Tables Users user_id PK Bankaccount bank_account_id PK user_bankaccount bank_account_id PK ( references bankaccount.bank_account_id ) user_id PK ( references user.user_id ) issues when I try to get all the users data (getAllUsers) using a JUnit test case, I get unable to fetch multiple bags simultaneously error. If I use Set and HashSet instead of List and ArrayList respectively, I get stackoverflow error. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira