JPA LazyInitialisationException-无法初始化代理

Question

是的，我见过类似的问题，但没有一个答案能真正引导我找到解决方案。我没有在任何地方使用这个线程，同样的代码在另一个jhipster应用程序中也可以使用，所以我不明白为什么这个提升转换会导致Hibernate问题。

public UserDetailsContextMapper userDetailsContextMapper() {
    return new UserDetailsContextMapper() {
        @Override
        public UserDetails mapUserFromContext(
            DirContextOperations ctx, String username,
            Collection<? extends GrantedAuthority> authorities) {
            log.error("2 " + username + " -> " + ctx.toString());
            String lowercaseLogonName = username.toLowerCase();
            Optional<User> userFromDatabase = userRepository.findOneByLogin(lowercaseLogonName);
            if (!userFromDatabase.isPresent()) {
                User ldapUser = new User();
                ldapUser.setLogin(lowercaseLogonName);
                ldapUser.setPassword(RandomStringUtils.random(60)); // We use LDAP password, but the password need to be set
                ldapUser.setActivated(true);
                try {
                    Attribute attribute = ctx.getAttributes().get("mail");
                    ldapUser.setEmail( attribute != null && attribute.size() > 0 ? (String) attribute.get(0) : "");
                    attribute = ctx.getAttributes().get("givenname");
                    ldapUser.setFirstName(attribute != null && attribute.size() > 0 ? (String) attribute.get(0) : "");
                    attribute = ctx.getAttributes().get("sn");
                    ldapUser.setLastName(attribute != null && attribute.size() > 0 ? (String) attribute.get(0) : "");
                } catch (NamingException e) {
                    log.warn("Couldn't get LDAP details for user: " + lowercaseLogonName);
                }

                Set<Authority> newUserAuthorities = new HashSet<>();
                Authority authority = authorityRepository.getOne(AuthoritiesConstants.USER);

                newUserAuthorities.add(authority); <-- This line in the Exception

                ldapUser.setAuthorities(newUserAuthorities);
                ldapUser.setLangKey("en");
                userRepository.saveAndFlush(ldapUser);

            }

例外：

org.hibernate.LazyInitializationException: could not initialize proxy [com.app.my.let.domain.Authority#ROLE_USER] - no Session
        at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:155)
        at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:268)
        at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:73)
        at com.app.my.let.domain.Authority_$$_jvst758_1e.hashCode(Authority_$$_jvst758_1e.java)
        at java.util.HashMap.hash(HashMap.java:339)
        at java.util.HashMap.put(HashMap.java:612)
        at java.util.HashSet.add(HashSet.java:220)
        at com.app.my.let.config.SecurityConfiguration$1.mapUserFromContext(SecurityConfiguration.java:249) <-- code line above

JPA地产：

jpa:
        database-platform: org.hibernate.dialect.SQLServer2012Dialect
        database: SQL_SERVER
        show_sql: true
        format_sql: true
        properties:
            hibernate.id.new_generator_mappings: true
            hibernate.cache.use_second_level_cache: false
            hibernate.cache.use_query_cache: false
            hibernate.generate_statistics: true

编辑-这解决了我的问题：

Optional<Authority> optAuthority = authorityRepository.findById(AuthoritiesConstants.USER);

Authority authority = optAuthority.get();

Answer 1

这一行：

Authority authority = authorityRepository.getOne(AuthoritiesConstants.USER);

只提供对实体的引用。在引擎盖下，它调用EntityManager\getReference。作为SAI，这不是实体，只是用于对象关系映射目的的引用。异常被抛出，因为您试图在事务环境之外强制转换它。

有两种解决方案。要获取实体，您必须使用EntityManager#find或在事务中执行（在方法上使用@Transactional）。在这里，您还可以调用Hibernate。初始化（权限）从数据库中获取实体。