hibernate

问题 I need based on parameter retrieve or not some associations from an entity. In the bellow example I need to get the records list only if a parameter is passed through my api. Can you recommend a way of achieving this using hibernate/spring data? I'm looking for the most clean and spring data-like approach. public class Customer { private UUID id; @OneToMany(mappedBy = "customer")
 private List<Record> records = new ArrayList<>(); } public class Record { private UUID id; @Column(name =

问题 ClassNotFoundException org hibernate engine FilterDefinition Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.FilterDefinition Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.FilterDefinition at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun

问题 ClassNotFoundException org hibernate engine FilterDefinition Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.FilterDefinition Caused by: java.lang.ClassNotFoundException: org.hibernate.engine.FilterDefinition at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun

问题 I am getting these warning and errors while I restart my tomcat or I stop my tomcat server. it is not interfering in my project but I guess this is serious problem while no. of user increase. P.S. I have used hibernate for database connection, display tag library for display tables and have used jsp/servlet. INFO: Illegal access: this web application instance has been stopped already. Could not load com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask. The eventual

问题 I am getting these warning and errors while I restart my tomcat or I stop my tomcat server. it is not interfering in my project but I guess this is serious problem while no. of user increase. P.S. I have used hibernate for database connection, display tag library for display tables and have used jsp/servlet. INFO: Illegal access: this web application instance has been stopped already. Could not load com.mchange.v2.resourcepool.BasicResourcePool$AsyncTestIdleResourceTask. The eventual

问题 I have an entity called User which has set of roles. I also have a Role entity which has set of users.( This is just a practice application for learning purposes.) public class User { private String firstName; private String lastName; @ManyToMany @JoinTable(name="user_role", joinColumns={@JoinColumn(name="user_id")}, inverseJoinColumns={@JoinColumn(name="role_id")}) private Set<Role> roles; //getters setters } public class Role { private String name; @ManyToMany(mappedBy="roles") private Set

问题 I have an entity called User which has set of roles. I also have a Role entity which has set of users.( This is just a practice application for learning purposes.) public class User { private String firstName; private String lastName; @ManyToMany @JoinTable(name="user_role", joinColumns={@JoinColumn(name="user_id")}, inverseJoinColumns={@JoinColumn(name="role_id")}) private Set<Role> roles; //getters setters } public class Role { private String name; @ManyToMany(mappedBy="roles") private Set

问题 I have something like: @Entity @Table(name = "myEntity") public class MyEntity { //.... @Column(name = "content") private byte[] content; //.... } PROBLEM : I pass MyEntity to the client as JSON string. But the problem is that I have two types of client's requests: I need to pass MyEntity with byte[] content array I need to pass MyEntity without byte[] content array In first case I needn't @JsonIgnore annotation, in second - do need. QUESTIONS : How to achive dynamical @JsonIgnore annotation?

问题 My problem is as follows: When i create POST request in "Postman" app. This is what i try to POST {"name": "John Doe", "email":"jdoe@test.com", "city": "London"} I am getting the following error: { "timestamp": "2018-11-19T20:16:00.486+0000", "status": 500, "error": "Internal Server Error", "message": "could not read a hi value - you need to populate the table: hibernate_sequence; nested exception is org.hibernate.id.IdentifierGenerationException: could not read a hi value - you need to

问题 My problem is as follows: When i create POST request in "Postman" app. This is what i try to POST {"name": "John Doe", "email":"jdoe@test.com", "city": "London"} I am getting the following error: { "timestamp": "2018-11-19T20:16:00.486+0000", "status": 500, "error": "Internal Server Error", "message": "could not read a hi value - you need to populate the table: hibernate_sequence; nested exception is org.hibernate.id.IdentifierGenerationException: could not read a hi value - you need to