PropertyAccessException：访问字段时出错

您的参数不匹配，即您尝试为用户类型指定Long作为参数：

您可以通过以下两种方式之一对其进行更改：

@Query("DELETe FROM Collaborator c WHERe c.user.id = :userId AND c.task.id = :taskId")void deleteUserFromTask(@Param("userId") Long userId, @Param("taskId") Long taskId);

要么

@Query("DELETe FROM Collaborator c WHERe c.user = :user AND c.task = :task")void deleteUserFromTask(@Param("user") User user, @Param("task") Task task);