读取注释时出错播放框架2.2
我已经开始学习Play框架，遵循Java指南（教程“ZenTasks”）。 一切顺利，直到我发现此错误： Error reading annotations for models.Task
类
package models; import java.util.*; import javax.persistence.*; import play.db.ebean.*; @Entity public class Task extends Model { @Id public Long id; public String title; public boolean done = false; public Date dueDate; @ManyToOne public User assignedTo; public String folder; @ManyToOne public Project project; public static Model.Finder find = new Model.Finder(Long.class, Task.class); public static List findTodoInvolving(String user) { return find.fetch("project").where() .eq("done", false) .eq("project.members.email", user) .findList(); } public static Task create(Task task, Long project, String folder) { task.project = Project.find.ref(project); task.folder = folder; task.save(); return task; } }
错误信息
@6hgmo097m - Internal server error, for (GET) [/] -> play.api.UnexpectedException: Unexpected exception[RuntimeException: Error reading annotations for models.Task] at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:148) ~[play_2.10.jar:2.2.1] at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:112) ~[play_2.10.jar:2.2.1] at scala.Option.map(Option.scala:145) ~[scala-library.jar:na] at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:112) ~[play_2.10.jar:2.2.1] at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:110) ~[play_2.10.jar:2.2.1] at scala.util.Success.flatMap(Try.scala:200) ~[scala-library.jar:na] Caused by: java.lang.RuntimeException: Error reading annotations for models.Task at com.avaje.ebeaninternal.server.deploy.parse.ReadAnnotations.readAssociations(ReadAnnotations.java:54) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readDeployAssociations(BeanDescriptorManager.java:1048) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readEntityDeploymentAssociations(BeanDescriptorManager.java:547) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.deploy(BeanDescriptorManager.java:237) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.core.InternalConfiguration.(InternalConfiguration.java:114) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:204) ~[avaje-ebeanorm.jar:na] Caused by: java.lang.RuntimeException: Error with association to [class models.Project] from [models.Task.project]. Is class models.Project registered? at com.avaje.ebeaninternal.server.deploy.parse.AnnotationAssocOnes.readManyToOne(AnnotationAssocOnes.java:165) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.parse.AnnotationAssocOnes.readAssocOne(AnnotationAssocOnes.java:63) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.parse.AnnotationAssocOnes.parse(AnnotationAssocOnes.java:54) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.parse.ReadAnnotations.readAssociations(ReadAnnotations.java:45) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readDeployAssociations(BeanDescriptorManager.java:1048) ~[avaje-ebeanorm.jar:na] at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readEntityDeploymentAssociations(BeanDescriptorManager.java:547) ~[avaje-ebeanorm.jar:na]
有同样的错误，（对我来说）是由我的@ManyToOne相关类没有标记@Entity注释引起的（在你的情况下检查User和Project ）。 还要确保这些类对Task的引用包含@OneToMany引用。