Java 向JPA实体添加其他方法

我想向我的用户实体添加方法，该方法返回其他实体的列表，该列表是用户实体中的字段，但经过筛选。问题是，当我将这样的方法添加到实体类时，我得到了一个错误

[class entities.WorksOnTask]使用非实体[class entities.User]作为关系属性[field User]中的目标实体

为什么，如何添加返回（过滤）工作区任务列表的方法I用户实体类

或者我还应该做些什么

@Entity
@Table(name = "user")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "User.findAll", query = "SELECT u FROM User u"),
    @NamedQuery(name = "User.findByUsername", query = "SELECT u FROM User u WHERE u.username = :username"),
    @NamedQuery(name = "User.findByPassword", query = "SELECT u FROM User u WHERE u.password = :password"),
    @NamedQuery(name = "User.findByFirstName", query = "SELECT u FROM User u WHERE u.firstName = :firstName"),
    @NamedQuery(name = "User.findByLastName", query = "SELECT u FROM User u WHERE u.lastName = :lastName"),
    @NamedQuery(name = "User.findByAppPrivileges", query = "SELECT u FROM User u WHERE u.appPrivileges = :appPrivileges"),
    @NamedQuery(name = "User.findByActivated", query = "SELECT u FROM User u WHERE u.activated = :activated")})
public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "Username")
    private String username;
    @Basic(optional = false)
    @Column(name = "Password")
    private String password;
    @Basic(optional = false)
    @Column(name = "FirstName")
    private String firstName;
    @Basic(optional = false)
    @Column(name = "LastName")
    private String lastName;
    @Basic(optional = false)
    @Column(name = "AppPrivileges")
    private int appPrivileges;
    @Basic(optional = false)
    @Column(name = "Activated")
    private boolean activated;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "user", fetch = FetchType.LAZY)
    private List<WorksOnProject> worksOnProjectList;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "user", fetch = FetchType.LAZY)
    private List<WorksOnTask> worksOnTaskList;
public List<WorksOnTask> getWorksOnTaskList(){
    return worksOnTaskList;
}

public void setWorksOnTaskList(List<WorksOnTask> worksOnTaskList) {
    this.worksOnTaskList = worksOnTaskList;
}
public List<WorksOnTask> findWorksOnTaskListNonRemoved(){
    return new  ArrayList(worksOnTaskList).stream().filter((w)->!w.getRemoved()).collect(Collectors.toList());
}

@实体
@表（name=“user”）
@XmlRootElement
@命名查询({
@NamedQuery（name=“User.findAll”，query=“从用户u中选择u”），
@NamedQuery（name=“User.findByUsername”，query=“从用户u中选择u，其中u.username=：username”），
@NamedQuery（name=“User.findByPassword”，query=“从用户u中选择u，其中u.password=：password”），
@NamedQuery（name=“User.findByFirstName”，query=“从用户u中选择u，其中u.firstName=：firstName”），
@NamedQuery（name=“User.findByLastName”，query=“从用户u中选择u，其中u.lastName=：lastName”），
@NamedQuery（name=“User.findByAppPrivileges”，query=“从用户u中选择u，其中u.appPrivileges=：appPrivileges”），
@NamedQuery（name=“User.findByActivated”，query=“从用户u中选择u，其中u.activated=：activated”）}
公共类用户实现可序列化{
私有静态最终长serialVersionUID=1L；
@身份证
@基本（可选=假）
@列（name=“Username”）
私有字符串用户名；
@基本（可选=假）
@列（name=“Password”）
私有字符串密码；
@基本（可选=假）
@列（name=“FirstName”）
私有字符串名；
@基本（可选=假）
@列（name=“LastName”）
私有字符串lastName；
@基本（可选=假）
@列（name=“AppPrivileges”）
私人int应用权限；
@基本（可选=假）
@列（name=“已激活”）
私有布尔激活；
@OneToMany（cascade=CascadeType.ALL，mappedBy=“user”，fetch=FetchType.LAZY）
私有列表worksOnProjectList；
@OneToMany（cascade=CascadeType.ALL，mappedBy=“user”，fetch=FetchType.LAZY）
私有列表工作区列表；
公共列表getWorksOnTaskList（）{
返回工作区列表；
}
public void setWorksOnTaskList（列表worksOnTaskList）{
this.worksOnTaskList=worksOnTaskList；
}
公共列表findWorksOnTaskListNonRemoved（）{
返回新的ArrayList（worksOnTaskList）.stream（）.filter（（w）->！w.getRemoved（））.collect（Collectors.toList（））；
}

堆栈跟踪显示实体任务的错误，但一切与用户中的相同

Exception in Application start method
java.lang.reflect.InvocationTargetException     at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)     at
com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
    at
com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)     at
sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start
method  at
com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
    at
com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(LauncherImpl.java:157)
    at
com.sun.javafx.application.LauncherImpl$$Lambda$53/200006406.run(Unknown
Source)     at java.lang.Thread.run(Thread.java:745) Caused by: Exception
[EclipseLink-30005] (Eclipse Persistence Services -
2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for
persistence archives with ClassLoader:
sun.misc.Launcher$AppClassLoader@55f96302 Internal Exception:
javax.persistence.PersistenceException: Exception [EclipseLink-28018]
(Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [DBPU] failed.
Internal Exception: Exception [EclipseLink-7250] (Eclipse Persistence
Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.ValidationException Exception
Description: [class entities.Project] uses a non-entity [class
entities.Task] as target entity in the relationship attribute [field
iDRootTask].    at
org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127)
    at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:107)
    at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:177)
    at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
    at
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at pg.jpa.JpaAccessManager.<init>(JpaAccessManager.java:24)     at
pg.Login.start(Login.java:49)   at
com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
    at
com.sun.javafx.application.LauncherImpl$$Lambda$56/574011920.run(Unknown
Source)     at
com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
    at
com.sun.javafx.application.PlatformImpl$$Lambda$50/1768305536.run(Unknown
Source)     at
com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
    at
com.sun.javafx.application.PlatformImpl$$Lambda$52/1148099840.run(Unknown
Source)     at java.security.AccessController.doPrivileged(Native Method)
    at
com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
    at
com.sun.javafx.application.PlatformImpl$$Lambda$51/1146743572.run(Unknown
Source)     at
com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)  at
com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
    at
com.sun.glass.ui.gtk.GtkApplication$$Lambda$42/379110473.run(Unknown
Source)     ... 1 more Caused by: javax.persistence.PersistenceException:
Exception [EclipseLink-28018] (Eclipse Persistence Services -
2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [DBPU] failed.
Internal Exception: Exception [EclipseLink-7250] (Eclipse Persistence
Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.ValidationException Exception
Description: [class entities.Project] uses a non-entity [class
entities.Task] as target entity in the relationship attribute [field
iDRootTask].    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.createPredeployFailedPersistenceException(EntityManagerSetupImpl.java:1954)
    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1945)
    at
org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:98)
    at
org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:96)
    ... 19 more Caused by: Exception [EclipseLink-28018] (Eclipse
Persistence Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [DBPU] failed.
Internal Exception: Exception [EclipseLink-7250] (Eclipse Persistence
Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.ValidationException Exception
Description: [class pentities.Project] uses a non-entity [class
entities.Task] as target entity in the relationship attribute [field
iDRootTask].    at
org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:230)
    ... 23 more Caused by: Exception [EclipseLink-7250] (Eclipse
Persistence Services - 2.5.2.v20140319-9ad6abd):
org.eclipse.persistence.exceptions.ValidationException Exception
Description: [class entities.Project] uses a non-entity [class
entities.Task] as target entity in the relationship attribute [field
iDRootTask].    at
org.eclipse.persistence.exceptions.ValidationException.nonEntityTargetInRelationship(ValidationException.java:1378)
    at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.RelationshipAccessor.getReferenceDescriptor(RelationshipAccessor.java:553)
    at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processForeignKeyRelationship(ObjectAccessor.java:659)
    at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ObjectAccessor.processOwningMappingKeys(ObjectAccessor.java:733)
    at
org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.ManyToOneAccessor.process(ManyToOneAccessor.java:123)
    at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processOwningRelationshipAccessors(MetadataProject.java:1580)
    at
org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage3(MetadataProject.java:1833)
    at
org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:580)
    at
org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:585)
    at
org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1869)
    ... 21 more Exception running application pg.Login

应用程序启动方法中出现异常 java.lang.reflect.InvocationTargetException位于 sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）位于 invoke（NativeMethodAccessorImpl.java:62） 在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） 位于java.lang.reflect.Method.invoke（Method.java:483） com.sun.javafx.application.LaunchImpl.launchApplicationWithArgs（LaunchImpl.java:363） 在 com.sun.javafx.application.LaunchImpl.launchApplication（LaunchImpl.java:303） 位于的sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法） invoke（NativeMethodAccessorImpl.java:62） 在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） 位于java.lang.reflect.Method.invoke（Method.java:483） sun.launcher.launchelper$FXHelper.main（launchelper.java:767） 原因：java.lang.RuntimeException:应用程序启动时出现异常 方法在 com.sun.javafx.application.LaunchImpl.launchApplication1（LaunchImpl.java:875） 在 lambda$launchApplication$147（launchimpl.java:157） 在 com.sun.javafx.application.launchempl$$Lambda$53/200006406.run（未知 源代码）在java.lang.Thread.run（Thread.java:745）处，由以下原因引起：异常 [EclipseLink-30005]（Eclipse持久性服务）- 2.5.2.v20140319-9ad6abd）：org.eclipse.persistence.exceptions.PersistenceUnitLoadingException 异常描述：搜索时引发异常 使用ClassLoader进行持久化归档： sun.misc.Launcher$AppClassLoader@55f96302内部异常： javax.persistence.PersistenceException:异常[EclipseLink-28018] （Eclipse持久性服务-2.5.2.v20140319-9ad6abd）： org.eclipse.persistence.exceptions.EntityManagerSetupException 异常描述：PersistenceUnit[DBPU]的预部署失败。 内部异常：异常[EclipseLink-7250]（Eclipse持久性） 服务-2.5.2.v20140319-9ad6abd）： org.eclipse.persistence.exceptions.ValidationException异常 Description:[类实体.Project]使用非实体[class] entities.Task]作为关系属性[字段]中的目标实体 iDRootTask].at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources（PersistenceUnitLoadingException.java:127） 在 org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl（PersistenceProvider.java:107） 在 org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory（PersistenceProvider.java:177） 在 persistence.persistence.createEntityManagerFactory（persistence.java:79） 在 persistence.persistence.createEntityManagerFactory（persistence.java:54） 在pg.jpa.JpaAccessManager.（JpaAccessManager.java:24）在 pg.Login.start（Login.java:49）位于 com.sun.javafx.application.launchempl.lambda$launchApplication1$153（launchempl.java:821） 在 com.sun.javafx.application.launchempl$$Lambda$56/57401920.run（未知 来源）在 com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166（PlatformImpl.java:323） 在 com.sun.javafx.application.platformpl$$Lambda$50/1768305536.run（未知 来源）在 com.sun.javafx.application.PlatformImpl.lambda$null$164（PlatformImpl.java:292） 在

public List<WorksOnTask> getWorksOnTaskListNonRemoved() {
    ArrayList<WorksOnTask> wots =  new ArrayList<>(worksOnTaskList);
    wots.removeIf((w)->w.getRemoved());
    return wots;
}

public List<WorksOnTask> getWorksOnTaskListNonRemoved() {
    ArrayList<WorksOnTask> wots =  new ArrayList<>(worksOnTaskList);
    wots.removeIf(new Predicate<WorksOnTask>(){

        @Override
        public boolean test(WorksOnTask t) {
            return t.getRemoved();
        }

    });

    return wots;
}

new ArrayList<>(user.getWorksOnTaskList()).stream().....

user.getWorksOnTaskList().stream()......