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POUsing a HashMap in Hibernate Many-to-Many mapping. Hibernate could not find mapKey
 

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  1. POUsing a HashMap in Hibernate Many-to-Many mapping. Hibernate could not find mapKey
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    <p>Would it be possible to declare a HashMap in the following object called Group? </p> <p>Doing something like this doesn't work:</p> <pre><code>@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "group") @MapKey(name = "member.name") private Map&lt;String, GroupMember&gt; groupMembers = new HashMap&lt;String, GroupMember&gt;(); </code></pre> <p>StackTrace:</p> <pre><code>12:07:51 [INFO] [Groups] Enabling Groups v0.1 12:07:51 [SEVERE] Error occurred while enabling Groups v0.1 (Is it up to date?) java.lang.RuntimeException: An exception has occured while initializing the database at groups.storage.MyDatabase.initializeDatabase(MyDatabase.java:83) at groups.storage.Dao.&lt;init&gt;(Dao.java:26) at groups.Groups.onEnable(Groups.java:30) at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217) at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457) at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381) at org.bukkit.craftbukkit.v1_5_R2.CraftServer.loadPlugin(CraftServer.java:282) at org.bukkit.craftbukkit.v1_5_R2.CraftServer.enablePlugins(CraftServer.java:264) at org.bukkit.craftbukkit.v1_5_R2.CraftServer.reload(CraftServer.java:605) at org.bukkit.Bukkit.reload(Bukkit.java:184) at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:23) at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:188) at org.bukkit.craftbukkit.v1_5_R2.CraftServer.dispatchCommand(CraftServer.java:523) at org.bukkit.craftbukkit.v1_5_R2.CraftServer.dispatchServerCommand(CraftServer.java:512) at net.minecraft.server.v1_5_R2.DedicatedServer.am(DedicatedServer.java:261) at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:226) at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:474) at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:407) at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573) Caused by: java.lang.RuntimeException: Failed to create a new instance of the EbeanServer at groups.storage.MyDatabase.loadDatabase(MyDatabase.java:162) at groups.storage.MyDatabase.initializeDatabase(MyDatabase.java:77) ... 18 more Caused by: javax.persistence.PersistenceException: groups.model.Group: Could not find mapKey property [member.name] on [groups.model.GroupMember] at com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany.initMapKeyProperty(BeanPropertyAssocMany.java:744) at com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany.initialise(BeanPropertyAssocMany.java:147) at com.avaje.ebeaninternal.server.deploy.BeanDescriptor.initialiseOther(BeanDescriptor.java:763) at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.initialiseAll(BeanDescriptorManager.java:403) at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.deploy(BeanDescriptorManager.java:293) at com.avaje.ebeaninternal.server.core.InternalConfiguration.&lt;init&gt;(InternalConfiguration.java:150) at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:209) at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:64) at com.avaje.ebean.EbeanServerFactory.create(EbeanServerFactory.java:78) at groups.storage.MyDatabase.loadDatabase(MyDatabase.java:159) ... 19 more </code></pre> <p>...</p> <pre><code>@Entity @Table(name = "groups_group") public class Group { public enum Type { Include, Exclude } @Id @GeneratedValue @Column(name = "id", unique = true, nullable = false) private Integer id; @Column(name = "name", unique = true, nullable = false, length = 25) private String name; @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "group") @MapKey(name = "member.name") private Map&lt;String, GroupMember&gt; groupMembers = new HashMap&lt;String, GroupMember&gt;(); @Column(name = "personal", nullable = false) private Boolean personal = false; @Enumerated(value = EnumType.ORDINAL) @Column(name = "type", nullable = false, length = 2) private Type type = Type.Include; @Column(name = "password", nullable = true, length = 16) private String password; @Version @Column(name = "update_time", nullable = false) Timestamp updatetime; @CreatedTimestamp @Column(name = "create_time", nullable = false) Timestamp createTime; public Group() {} //getters and setters } </code></pre> <p>..</p> <pre><code>@Entity @Table(name = "groups_group_member") public class GroupMember { public enum Role { ADMIN, MODERATOR, MEMBER, BANNED } @Id @GeneratedValue @Column(name = "id", unique = true, nullable = false) private Integer id; @ManyToOne @JoinColumn(name = "group_id") private Group group; @ManyToOne @JoinColumn(name = "member_id") private Member member; @Enumerated(value = EnumType.ORDINAL) @Column(name = "role", nullable = false, length = 2) private Role role = Role.MEMBER; @Version @Column(name = "update_time", nullable = false) Timestamp updatetime; @CreatedTimestamp @Column(name = "create_time", nullable = false) Timestamp createTime; public GroupMember() {} //getters and setters... } </code></pre> <p>...</p> <pre><code>@Entity @Table(name = "groups_member") public class Member { @Id @GeneratedValue @Column(name = "id", unique = true, nullable = false) private Integer id; @Column(name = "name", unique = true, nullable = false, length = 16) private String name; @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "member") private Set&lt;GroupMember&gt; groupMembers = new HashSet&lt;GroupMember&gt;(); @Version @Column(name = "update_time", nullable = false) Timestamp updatetime; @CreatedTimestamp @Column(name = "create_time", nullable = false) Timestamp createTime; public Member() {} //getters and setters } </code></pre>
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    1. PTQuestion
    1. This table or related slice is empty.
    1. USJonathan
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    1. COShouldn't it be "name" instead of "member.name" ?
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      1. POUsing a HashMap in Hibernate Many-to-Many mapping. Hibernate could not find mapKey
      1. USMichal Borek
    2. CONo, because as far as im aware, it's mapped through GroupMember. GroupMember doesn't have name, it only has Member. So I have to go member.name. Make sense?
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      1. POUsing a HashMap in Hibernate Many-to-Many mapping. Hibernate could not find mapKey
      1. USJonathan
 

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