当架构更新时，作用域“session”对当前线程不是活动的

Question

@Component
@Scope(value = "session", proxyMode = ScopedProxyMode.TARGET_CLASS)
public class PreferredDatabaseSession implements Serializable {

private DatabaseEnvironment preferredDb;

public DatabaseEnvironment getPreferredDb() {
    return preferredDb;
}

public void setPreferredDb(DatabaseEnvironment preferredDb) {
    this.preferredDb = preferredDb;
}

}

我把它叫做：

public class DataSourceRouter extends AbstractRoutingDataSource {

    @Autowired
    private PreferredDatabaseSession db;

    @Override
    protected Object determineCurrentLookupKey() {
    return db.getPreferredDb();
    }
}

也从这里打电话：

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

@Autowired
private PreferredDatabaseSession userDatabaseSession;

private void setPreferredDatabase() throws DataAccessException {
    // String preferredDb = (String) request.getSession().getAttribute("preferredDb");
    String preferredDb = request.getParameter("preferredDb");
    if (preferredDb.equals(Constants.JPLATFORM)) {
        userDatabaseSession.setPreferredDb(DatabaseEnvironment.JPLATFORM);
    } else if (preferredDb.equals(Constants.TIGER)) {
        userDatabaseSession.setPreferredDb(DatabaseEnvironment.TIGER);
    }
}
}

Answer 1

UserDetailsServiceImpl是一个单例bean，但HttpServletRequest是一个请求范围bean，这就是异常的原因。

尝试使用

ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request = requestAttributes.getRequest();

而不是自动调用HttpServletRequest

@Override
protected Object determineCurrentLookupKey() {
if (RequestContextHolder.getRequestAttributes() == null) {
    return DEFAULT_ONE;
}
return db.getPreferredDb();
}