休止状態を使用して、リソース クラスに多対多の関係があります。カテゴリ クラス:
@Entity
public class Category {
Id
@GeneratedValue
private long id;
@ManyToMany
@JoinTable(name = "category_activity",
joinColumns = { @JoinColumn(name = "Category_id") },
inverseJoinColumns = { @JoinColumn(name = "activities_id") })
private Collection<Activity> activities;
}
そしてアクティビティクラスでは:
@Entity
public class Activity {
@Id
@GeneratedValue
private long id;
@ManyToMany
@JoinTable(name="category_activity",
joinColumns={@JoinColumn(name="activities_id")},
inverseJoinColumns={@JoinColumn(name="Category_id")})
private Collection<Category> category;
}
それらの間に oneToMany 関係があったとき、私はうまく機能するクエリを使用していました:
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
Collection<Activity> activities = (Collection<Activity>) session.createQuery("from Activity as a where a.category.id=" + categoryId + " order by a.key").list();
session.getTransaction().commit();
ManyToMany 関係のこのクエリを修正できるように助けていただければ幸いです。
私もこのクエリを使用しました:
activities = (List<Activity>) session.createQuery("from Activity a join a.category cs where cs.id= :categoryId order by a.key").setLong("categoryId", categoryId).list();
そして、スタックトレースで次のエラーが発生しました:
<html><head><title>Apache Tomcat/7.0.23 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - </h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u></u></p><p><b>description</b> <u>The server encountered an internal error () that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to java.lang.Comparable
java.util.ComparableTimSort.countRunAndMakeAscending(Unknown Source)
java.util.ComparableTimSort.sort(Unknown Source)
java.util.ComparableTimSort.sort(Unknown Source)
java.util.Arrays.sort(Unknown Source)
java.util.Collections.sort(Unknown Source)
se.softwerk.timelog.controller.ActivityManager.activityList2(ActivityManager.java:64)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
</pre></p><p><b>note</b> <u>The full stack trace of the root cause is available in the Apache Tomcat/7.0.23 logs.</u></p><HR size="1" noshade="noshade"><h3>Apache Tomcat/7.0.23</h3></body></html>