Hibernate持久化类配置问题

下面这个类是一个树结构的节点，我想用Hibernate的OneToMany来实现树的结构，报错信息在后面，实在弄不明白了，各位帮帮忙...
package model;import java.util.Set;import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;import org.hibernate.annotations.GenericGenerator;import com.sun.istack.internal.NotNull;
@Entity
public class Node {
private int nodeid;//主键
private String nodename;//节点名
private int nodelevel;//节点层级
// private int nodeSerialNo;//节点序号
private Node parentnode;//父节点
private Set<Node> childnodes;//子节点
public Node(){

}
@Id
@GeneratedValue()
@GenericGenerator(name="EAM",strategy="native")
public int getNodeid() {
return nodeid;
}
public void setNodeid(int nodeid) {
this.nodeid = nodeid;
}
@NotNull
public String getNodename() {
return nodename;
}
public void setNodename(String nodename) {
this.nodename = nodename;
}
@NotNull
public int getNodelevel() {
return nodelevel;
}
public void setNodelevel(int nodelevel) {
this.nodelevel = nodelevel;
}
@OneToMany(mappedBy="parentnode",fetch=FetchType.EAGER)
public Node getParentnode() {
return parentnode;
}
public void setParentnode(Node parentnode) {
this.parentnode = parentnode;
}
@ManyToOne
public Set<Node> getChildnodes() {
return childnodes;
}
public void setChildnodes(Set<Node> childnodes) {
this.childnodes = childnodes;
}
}报错信息：
org.hibernate.AnnotationException: Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements: model.Node.parentnode    org.hibernate.cfg.annotations.CollectionBinder.getCollectionBinder(CollectionBinder.java:324)
    org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1723)
    org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:796)
    org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:707)
    org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:4035)
    org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3989)
    org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1398)
    org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1856)
    controller.TheStructure.enter(TheStructure.java:51)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    java.lang.reflect.Method.invoke(Method.java:597)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
    com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
    org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
    com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    java.lang.Thread.run(Thread.java:619)
    

解决方案 »

  1.   

    Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or @CollectionOfElements: model.Node.parentnode以上错误信息，找不到model.Node.parentnode
    onetomany至少要有两个对象进行连接才行，一个对象和自己连接估计就会报这个错误，树不需要做onetomany，只需要private List<Node> childnodes;就可以了，一个节点包含所有子节点
      

  2.   

    习惯用xml不会用annotation的人飘过。
      

  3.   

    按照你的想法重新写了一遍,又报另外一个错误了...帮忙看下是什么情况...package model;import java.util.List;import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.Id;
    import org.hibernate.annotations.GenericGenerator;import com.sun.istack.internal.NotNull;
    @Entity
    public class Node {
    private int nodeid;//主键
    private String nodename;//节点名
    private int nodelevel;//节点层级
    // private int nodeSerialNo;//节点序号
    // private Node parentnode;//父节点
    private List<Node> childnodes;//子节点
    public Node(){
    }
    @Id
    @GeneratedValue()
    @GenericGenerator(name="EAM",strategy="native")
    public int getNodeid() {
    return nodeid;
    }
    public void setNodeid(int nodeid) {
    this.nodeid = nodeid;
    }
    @NotNull
    public String getNodename() {
    return nodename;
    }
    public void setNodename(String nodename) {
    this.nodename = nodename;
    }
    @NotNull
    public int getNodelevel() {
    return nodelevel;
    }
    public void setNodelevel(int nodelevel) {
    this.nodelevel = nodelevel;
    }
    public List<Node> getChildnodes() {
    return childnodes;
    }
    public void setChildnodes(List<Node> childnodes) {
    this.childnodes = childnodes;
    }
    }
    报错信息：
    Struts Problem ReportStruts has detected an unhandled exception:
    # Messages:  Could not determine type for: java.util.List, at table: Node, for columns: [org.hibernate.mapping.Column(childnodes)]
    File:  org/hibernate/mapping/SimpleValue.java
    Line number:  306
    Stacktraces
    org.hibernate.MappingException: Could not determine type for: java.util.List, at table: Node, for columns: [org.hibernate.mapping.Column(childnodes)]    org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:306)
        org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:290)
        org.hibernate.mapping.Property.isValid(Property.java:217)
        org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:464)
        org.hibernate.mapping.RootClass.validate(RootClass.java:235)
        org.hibernate.cfg.Configuration.validate(Configuration.java:1362)
        org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1865)
        controller.Nodes.Scan(Nodes.java:128)
        sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        java.lang.reflect.Method.invoke(Method.java:597)
        com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
        com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
        com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
        com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
        org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
        com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
        com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
        com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166)
        com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
        com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
        org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
        org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:485)
        org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
        org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
        org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
        org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
        org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
        org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
        org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
        org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        java.lang.Thread.run(Thread.java:619)
        
      

  4.   

    已经解决了，原因是原来那个类@onetomany 和@manytoone放反了