org.hibernate.AnnotationException: XML映射中未指定实体的标识符

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英文:

org.hibernate.AnnotationException:No identifier specified for entity with XML Mapping

问题

I can see that you're encountering issues with your JPA configuration and annotations. Below is the translated version of your provided content:

  1. 我正在处理一个JPA程序，并且需要通过xml映射为一个类编写注解。我将我的模型类编写如下：
  3. // Java代码
  4. ppackage model;
  6. import javax.persistence.*;
  7. import java.util.Date;
  8. public class Reservierung {
  9.     public Reservierung(Date datum, int praemienMeilenBonus, int preis, StatusInfo status, Zug zug, Strecke strecke, Benutzer benutzer, Zahlung zahlung) {
  10.         // 构造函数内容...
  12.     }
  14.     // 属性和方法...
  16. }

之后，我创建了名为orm的xml映射文件：

  1. // XML代码
  2. <?xml version="1.0" encoding="UTF-8"?>
  3. <entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
  4.         version="2.0">
  5.     <!-- 映射定义... -->
  6. </entity-mappings>

最后，我将orm.xml和所有其他文件添加到了我的persistence.xml中，现在看起来像这样：

  1. // XML代码
  2. <persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
  3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
  5.              http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
  6.   version="2.1">
  8.   <persistence-unit name="westbahn">
  9.       <!-- 配置... -->
  10.   </persistence-unit>
  11. </persistence>

但是，你遇到了一些问题，包括配置和注解。根据你提供的信息，我无法直接解决你的问题。你可能需要仔细检查以下几点：

  1. 确保你的类路径和包名设置正确。
  2. 检查类和属性的拼写是否正确。
  3. 确保所有需要的依赖库都已添加到项目中。
  4. 检查注解和映射是否正确配置。
  5. 确保没有重复映射或重复添加类到持久化单元。

如果你已经按照上述步骤操作并仍然遇到问题，可能需要详细检查错误日志以获得更多信息，以便确定问题所在。另外，考虑尝试不同的配置选项以解决问题。

英文:

I'm working on a JPA program and had to write annotations for one class via xml-mapping. I wrote my model class like that:

  1. ppackage model;
  3. import javax.persistence.*;
  4. import java.util.Date;
  5. public class Reservierung {
  6. 	public Reservierung(Date datum, int praemienMeilenBonus, int preis, StatusInfo status, Zug zug, Strecke strecke, Benutzer benutzer, Zahlung zahlung) {
  7. 		this.datum = datum;
  8. 		this.praemienMeilenBonus = praemienMeilenBonus;
  9. 		this.preis = preis;
  10. 		this.status = status;
  11. 		this.zug = zug;
  12. 		this.strecke = strecke;
  13. 		this.benutzer = benutzer;
  14. 		this.zahlung = zahlung;
  15. 	}
  17. 	private Long ID;
  19. 	private Date datum;
  21. 	private int praemienMeilenBonus = 15;
  23. 	private int preis = 150;
  25. 	private StatusInfo status;
  26. 	private Zug zug;
  27. 	private Strecke strecke;
  28. 	private Benutzer benutzer;
  29. 	private Zahlung zahlung;
  31. 	public Date getDatum() {
  32. 		return datum;
  33. 	}
  35. 	public void setDatum(Date datum) {
  36. 		this.datum = datum;
  37. 	}
  39. 	public int getPraemienMeilenBonus() {
  40. 		return praemienMeilenBonus;
  41. 	}
  43. 	public void setPraemienMeilenBonus(int praemienMeilenBonus) {
  44. 		this.praemienMeilenBonus = praemienMeilenBonus;
  45. 	}
  47. 	public int getPreis() {
  48. 		return preis;
  49. 	}
  51. 	public void setPreis(int preis) {
  52. 		this.preis = preis;
  53. 	}
  55. 	public StatusInfo getStatus() {
  56. 		return status;
  57. 	}
  59. 	public void setStatus(StatusInfo status) {
  60. 		this.status = status;
  61. 	}
  63. 	public Zug getZug() {
  64. 		return zug;
  65. 	}
  67. 	public void setZug(Zug zug) {
  68. 		this.zug = zug;
  69. 	}
  71. 	public Strecke getStrecke() {
  72. 		return strecke;
  73. 	}
  75. 	public void setStrecke(Strecke strecke) {
  76. 		this.strecke = strecke;
  77. 	}
  79. 	public Benutzer getBenutzer() {
  80. 		return benutzer;
  81. 	}
  83. 	public void setBenutzer(Benutzer benutzer) {
  84. 		this.benutzer = benutzer;
  85. 	}
  87. 	public Zahlung getZahlung() {
  88. 		return zahlung;
  89. 	}
  91. 	public void setZahlung(Zahlung zahlung) {
  92. 		this.zahlung = zahlung;
  93. 	}
  95. 	public Long getID() {
  96. 		return ID;
  97. 	}
  99. 	public void setID(Long ID) {
  100. 		this.ID = ID;
  101. 	}
  102. }

and after that I created the xml mapping file that I named orm:

  2. ?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
  3. &lt;entity-mappings xmlns=&quot;http://java.sun.com/xml/ns/persistence/orm&quot;
  4.         version=&quot;2.0&quot;&gt;
  5.     &lt;named-query name=&quot;Reservierung.findAll&quot;&gt;
  6.         &lt;query&gt;SELECT b FROM model.Reservierung b&lt;/query&gt;
  7.     &lt;/named-query&gt;
  8.     &lt;entity name=&quot;Reservierung&quot; class=&quot;model.Reservierung&quot; &gt;
  9.         &lt;table name=&quot;Reservierung&quot; /&gt;
  10.         &lt;attributes&gt;
  11.             &lt;id name=&quot;ID&quot;&gt;
  12.                 &lt;generated-value strategy=&quot;AUTO&quot; /&gt;
  13.             &lt;/id&gt;
  14.             &lt;basic name=&quot;datum&quot; /&gt;
  15.             &lt;basic name=&quot;praemienMeilenBonus&quot; /&gt;
  16.             &lt;basic name=&quot;preis&quot; /&gt;
  17.             &lt;basic name=&quot;StatusInfo&quot; /&gt;
  19.             &lt;one-to-one name=&quot;strecke&quot; /&gt;
  20.             &lt;one-to-one name=&quot;zug&quot;/&gt;
  21.             &lt;one-to-one name=&quot;benutzer&quot;/&gt;
  22.             &lt;transient name=&quot;zahlung&quot;/&gt;
  23.         &lt;/attributes&gt;
  24.     &lt;/entity&gt;
  25. &lt;/entity-mappings&gt;

finnaly I added the orm.xml and all the other files in my persistence.xml, which looks now like this

  1. &lt;persistence xmlns=&quot;http://xmlns.jcp.org/xml/ns/persistence&quot;
  2. xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
  3.   xsi:schemaLocation=&quot;http://xmlns.jcp.org/xml/ns/persistence
  4.              http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd&quot;
  5.   version=&quot;2.1&quot;&gt;
  7.   &lt;persistence-unit name=&quot;westbahn&quot;&gt;
  8.       &lt;description&gt; Hibernate JPA Configuration Example&lt;/description&gt;
  9.       &lt;provider&gt;org.hibernate.jpa.HibernatePersistenceProvider&lt;/provider&gt;
  11.       &lt;mapping-file&gt;META-INF/orm.xml&lt;/mapping-file&gt;
  13.       &lt;class&gt;model.Bahnhof&lt;/class&gt;
  14.       &lt;class&gt;model.Benutzer&lt;/class&gt;
  15.       &lt;class&gt;model.Reservierung&lt;/class&gt;
  16.       &lt;class&gt;model.Einzelticket&lt;/class&gt;
  17.       &lt;class&gt;model.Preisstaffelung&lt;/class&gt;
  18.       &lt;class&gt;model.Sonderangebot&lt;/class&gt;
  19.       &lt;class&gt;model.Strecke&lt;/class&gt;
  20.       &lt;class&gt;model.Ticket&lt;/class&gt;
  21.       &lt;class&gt;model.Zeitkarte&lt;/class&gt;
  22.       &lt;class&gt;model.Zug&lt;/class&gt;
  23.       &lt;class&gt;model.Reservierung&lt;/class&gt;
  25.         &lt;properties&gt;
  26.     &lt;!--
  27.           &lt;property name=&quot;javax.persistence.jdbc.driver&quot; value=&quot;com.mysql.cj.jdbc.Driver&quot; /&gt;
  28.           &lt;property name=&quot;javax.persistence.jdbc.url&quot; value=&quot;jdbc:mysql://localhost:3306/westbahn?serverTimezone=UTC&quot; /&gt;
  29.           &lt;property name=&quot;javax.persistence.jdbc.user&quot; value=&quot;westbahnUser&quot; /&gt;
  30.           &lt;property name=&quot;javax.persistence.jdbc.password&quot; value=&quot;westbahnPassword&quot; /&gt;
  31.     --&gt;
  32.             &lt;property name=&quot;javax.persistence.jdbc.driver&quot; value=&quot;org.h2.Driver&quot; /&gt;
  33.             &lt;property name=&quot;javax.persistence.jdbc.url&quot;    value=&quot;jdbc:h2:file:./db/testing&quot; /&gt;
  34.             &lt;property name=&quot;javax.persistence.jdbc.user&quot; value=&quot;sa&quot; /&gt;
  35.             &lt;property name=&quot;javax.persistence.jdbc.password&quot; value=&quot;&quot; /&gt;
  36.             &lt;property name=&quot;hibernate.dialect&quot; value=&quot;org.hibernate.dialect.H2Dialect&quot;/&gt;
  37.             &lt;property name=&quot;hibernate.show_sql&quot; value=&quot;false&quot; /&gt;
  38.             &lt;property name=&quot;hibernate.hbm2ddl.auto&quot; value=&quot;create-drop&quot; /&gt;
  39.             &lt;!--&lt;property name=&quot;hibernate.dialect&quot; value=&quot;org.hibernate.dialect.HSQLDialect&quot;/&gt;--&gt;
  40.         &lt;/properties&gt;
  41.   &lt;/persistence-unit&gt;
  42. &lt;/persistence&gt;

Till now I tried to see if the names where spelled wrong, if my class had some attributes that I didn't account for and also tried to change the name and finally added access="field" to the entity tag, but if I do so, I get another exception on top of the first one: org.hibernate.AnnotationException: Unable to load class defined in XML: model.Reservierung

Where did I do wrong?

edit:
Before the new orm.xml I had different mapping file named Reservierung.hbm.xml

  2. &lt;?xml version = &quot;1.0&quot; encoding = &quot;utf-8&quot;?&gt;
  3. &lt;!DOCTYPE hibernate-mapping PUBLIC
  4.         &quot;-//Hibernate/Hibernate Mapping DTD//EN&quot;
  5.         &quot;http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd&quot;&gt;
  7. &lt;hibernate-mapping&gt;
  8.     &lt;class name=&quot;model.Reservierung&quot; table=&quot;Reservierung&quot;&gt;
  9.         &lt;meta attribute = &quot;class-description&quot;&gt;
  10.             This class contains the reservations
  11.         &lt;/meta&gt;
  13.         &lt;id name = &quot;ID&quot; type = &quot;long&quot; column = &quot;ID&quot;&gt;
  14.             &lt;generator class=&quot;native&quot;/&gt;
  15.         &lt;/id&gt;
  17.         &lt;property name = &quot;datum&quot; column = &quot;datum&quot; type = &quot;date&quot;&gt; &lt;/property&gt;
  18.         &lt;property name = &quot;praemienMeilenBonus&quot; column = &quot;praemienMeilenBonus&quot;&gt; &lt;/property&gt;
  19.         &lt;property name = &quot;preis&quot; column = &quot;preis&quot;&gt; &lt;/property&gt;
  20.         &lt;property name = &quot;status&quot; column = &quot;status&quot;&gt;
  21.             &lt;type name=&quot;org.hibernate.type.EnumType&quot;&gt;
  22.                 &lt;param name=&quot;enumClass&quot;&gt;model.StatusInfo&lt;/param&gt;
  23.             &lt;/type&gt;
  24.         &lt;/property&gt;
  25.         &lt;one-to-one name=&quot;strecke&quot; /&gt;
  26.         &lt;one-to-one name=&quot;zug&quot;/&gt;
  27.         &lt;one-to-one name=&quot;benutzer&quot;/&gt;
  29.     &lt;/class&gt;
  30. &lt;/hibernate-mapping&gt;

I wasn't happy with it, so I trashed it and started from scratch with the orm.xml file

edit: what I did:
I made a constructor + getter and setter in all classes and now the exception changed to this:

  1. java.lang.ClassCastException: class org.hibernate.mapping.SingleTableSubclass cannot be cast to class org.hibernate.mapping.RootClass (org.hibernate.mapping.SingleTableSubclass and org.hibernate.mapping.RootClass are in unnamed module of loader &#39;app&#39;)
  2. 	at org.hibernate.cfg.annotations.PropertyBinder.bind(PropertyBinder.java:214)
  3. 	at org.hibernate.cfg.annotations.PropertyBinder.makePropertyValueAndBind(PropertyBinder.java:205)
  4. 	at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:2283)
  5. 	at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:976)
  6. 	at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:803)
  7. 	at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.processEntityHierarchies(AnnotationMetadataSourceProcessorImpl.java:254)
  8. 	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.processEntityHierarchies(MetadataBuildingProcess.java:230)
  9. 	at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:273)
  10. 	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:903)
  11. 	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:934)
  12. 	at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:56)
  13. 	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
  14. 	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
  15. 	at main.Main.main(Main.java:47)
  16. Exception in thread &quot;main&quot; java.lang.NullPointerException
  17. 	at main.Main.main(Main.java:64)

huangapple
  • 本文由 发表于 2020年6月5日 21:33:05
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