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POJPA mapping error for sequence number
 

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  1. POJPA mapping error for sequence number
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    <p>I've been building a portion of an application to persist a user's dashboard objects and the JPA has been messing me up for ages.</p> <p>I've got an abstract Widget class that all of the dashboard objects will be extending as more are developed. They are contained in a WidgetList class which is persisted through JPA. To me, the code looks good, but I'm still a novice with Java EE 6 and JPA. When I try to deploy, I get the following error:</p> <pre><code> Exception [EclipseLink-41] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.DescriptorException Exception Description: A non-read-only mapping must be defined for the sequence number field. Descriptor: RelationalDescriptor(ui.dashboard.widgetlist.WidgetList --&gt; [DatabaseTable(WIDGETLIST)]) Runtime Exceptions: --------------------------------------------------------- at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:478) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.initializeDescriptors(DatabaseSessionImpl.java:406) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.postConnectDatasource(DatabaseSessionImpl.java:671) at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:620) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:228) at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:369) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:151) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:207) at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:202) at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:197) at com.sun.enterprise.container.common.impl.EntityManagerWrapper.createNamedQuery(EntityManagerWrapper.java:554) at ca.comdev.cdip.mis.enterpriseportal.workflow.task.reminder.ReminderJpaDao.readAll(ReminderJpaDao.java:71) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1056) at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1128) at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5292) at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:615) at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:567) at org.jboss.weld.ejb.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:57) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:858) at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:567) at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:157) at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:139) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:858) at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:797) at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:367) at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5264) at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5252) at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:190) at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:84) at $Proxy188.readAll(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:304) at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:54) at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:163) at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:298) at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.invoke(EnterpriseBeanProxyMethodHandler.java:127) at org.jboss.weld.util.CleanableMethodHandler.invoke(CleanableMethodHandler.java:43) at workflow.task.reminder.ReminderDao_$$_javassist_79.readAll(ReminderDao_$$_javassist_79.java) at workflow.task.reminder.ReminderSchedulerImpl.retrieveAllReminders(ReminderSchedulerImpl.java:117) at workflow.task.reminder.ReminderSchedulerImpl.initialize(ReminderSchedulerImpl.java:92) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.ejb.containers.interceptors.BeanCallbackInterceptor.intercept(InterceptorManager.java:1006) at com.sun.ejb.containers.interceptors.CallbackChainImpl.invokeNext(CallbackChainImpl.java:61) at com.sun.ejb.containers.interceptors.CallbackInvocationContext.proceed(CallbackInvocationContext.java:109) at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCallback(SystemInterceptorProxy.java:133) at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.init(SystemInterceptorProxy.java:115) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.ejb.containers.interceptors.CallbackInterceptor.intercept(InterceptorManager.java:961) at com.sun.ejb.containers.interceptors.CallbackChainImpl.invokeNext(CallbackChainImpl.java:61) at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:390) at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:373) at com.sun.ejb.containers.AbstractSingletonContainer.createSingletonEJB(AbstractSingletonContainer.java:521) at com.sun.ejb.containers.AbstractSingletonContainer.access$100(AbstractSingletonContainer.java:74) at com.sun.ejb.containers.AbstractSingletonContainer$SingletonContextFactory.create(AbstractSingletonContainer.java:696) at com.sun.ejb.containers.AbstractSingletonContainer.instantiateSingletonInstance(AbstractSingletonContainer.java:444) at org.glassfish.ejb.startup.SingletonLifeCycleManager.initializeSingleton(SingletonLifeCycleManager.java:213) at org.glassfish.ejb.startup.SingletonLifeCycleManager.initializeSingleton(SingletonLifeCycleManager.java:174) at org.glassfish.ejb.startup.SingletonLifeCycleManager.doStartup(SingletonLifeCycleManager.java:152) at org.glassfish.ejb.startup.EjbApplication.start(EjbApplication.java:150) at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126) at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241) at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236) at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339) at com.sun.enterprise.v3.server.ApplicationLoaderService.processApplication(ApplicationLoaderService.java:362) at com.sun.enterprise.v3.server.ApplicationLoaderService.postConstruct(ApplicationLoaderService.java:185) at com.sun.hk2.component.AbstractWombImpl.inject(AbstractWombImpl.java:174) at com.sun.hk2.component.ConstructorWomb$1.run(ConstructorWomb.java:87) at java.security.AccessController.doPrivileged(Native Method) at com.sun.hk2.component.ConstructorWomb.initialize(ConstructorWomb.java:84) at com.sun.hk2.component.AbstractWombImpl.get(AbstractWombImpl.java:77) at com.sun.hk2.component.SingletonInhabitant.get(SingletonInhabitant.java:58) at com.sun.hk2.component.LazyInhabitant.get(LazyInhabitant.java:107) at com.sun.hk2.component.AbstractInhabitantImpl.get(AbstractInhabitantImpl.java:60) at com.sun.enterprise.v3.server.AppServerStartup.run(AppServerStartup.java:236) at com.sun.enterprise.v3.server.AppServerStartup.start(AppServerStartup.java:128) at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:457) at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:401) at org.jvnet.hk2.osgiadapter.HK2Main.start(HK2Main.java:125) at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640) at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700) at org.apache.felix.framework.Felix.startBundle(Felix.java:1622) at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:915) at org.jvnet.hk2.osgimain.Main.start(Main.java:140) at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640) at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700) at org.apache.felix.framework.Felix.startBundle(Felix.java:1622) at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1077) at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264) at java.lang.Thread.run(Thread.java:619) </code></pre> <p>My WidgetList code is here:</p> <pre><code>package ui.dashboard.widgetlist; import principals.Principal; import ui.dashboard.widgets.Widget; import java.io.Serializable; import java.util.LinkedHashSet; import java.util.Set; import javax.persistence.CascadeType; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.MapsId; import javax.persistence.NamedQueries; import javax.persistence.NamedQuery; import javax.persistence.OneToMany; import javax.persistence.OneToOne; import javax.persistence.Table; /** * The storage class for the Widgets that a user has saved to their * profile. * @author mtatham */ @Entity @Table(name="WIDGETLIST") @NamedQueries({ @NamedQuery(name="widgetlist.byOwner",query="select w from WidgetList w where w.owner = :owner") }) public class WidgetList implements Serializable { /** * The system generated ID */ @Id @GeneratedValue @Column(name="WIDGETLIST_ID", nullable = false, insertable=true,updatable=true ) private Integer id; /** * The user principal used for the lookup on the database */ @OneToOne @MapsId private Principal owner; /** * The Set of Widgets associated with the owner. */ @OneToMany(mappedBy="currentWidgetList", cascade=CascadeType.ALL, orphanRemoval=true,fetch=FetchType.LAZY) private Set&lt;Widget&gt; widgetList = new LinkedHashSet&lt;Widget&gt;(); public Integer getId() { return id; } public void setId(int id) { this.id = id; } public Principal getOwner() { return owner; } public void setOwner(Principal owner) { this.owner = owner; } public Set&lt;Widget&gt; getWidgetList() { return this.widgetList; } public void setWidgetList(Set&lt;Widget&gt; widgetList) { this.widgetList = widgetList; } /** * Adds a new Widget to the Set. If the set already contains the * unique Widget being added, the method will end gracefully. * @param widget */ public void addWidget(Widget widget) { if(this.widgetList.contains(widget)){ return; }else { widget.setCurrentWidgetList(this); this.widgetList.add(widget); } } @Override public String toString() { if(getOwner()!=null){ return getId() + " - " + getOwner().getName(); } else{ return getId().toString(); } } public boolean equals(WidgetList wl) { return true; } </code></pre> <p>And, for the sake of completeness, the abstract Widget class that WidgetList is storing:</p> <pre><code>import ui.dashboard.widgetlist.WidgetList; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.DiscriminatorColumn; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Inheritance; import javax.persistence.InheritanceType; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; /** * This is the class used as the template for all of the customized widgets * that will be included on the Enterprise Portal dashboard. This abstract * class will contain the generic information required for the user's * customized dashboard. * * Any new widgets for the dashboard must extend this class and add their * custom data elements. * @author mtatham */ @Entity @Table(name = "WIDGETS") @Inheritance(strategy = InheritanceType.JOINED) @DiscriminatorColumn(name = "TYPE") public abstract class Widget implements Serializable{ /** * The ID of the Widget. Generated programmatically. */ @Id @GeneratedValue @Column(name="WIDGET_ID") private int id; /** * The id name used on the JSF page to identify the object */ @Column(name = "IDNAME") private String idName; /** * The WidgetList this Widget is currently assigned to. */ @ManyToOne(optional=false) @JoinColumn(name = "CURRENT_WIDGETLIST_ID", nullable=false) private WidgetList currentWidgetList; /** * Header name that is visible on the widget menu */ @Column(name = "HEADER") private String headerName; /** * JSF property that determines if a user can hide the widget. This will * be defaulted to 'true'. The only other value acceptable is 'false'. * * This is a String element even though there are only boolean values * due to the data being used in the xhtml pages. */ @Column(name = "TOGGLEABLE") private String toggleable = "true"; /** * JSF property that determines if a user can close a widget to remove it * from the dashboard. This will be defaulted to 'true'. The only other * value acceptable is 'false'. * * This is a String element even though there are only boolean values * due to the data being used in the xhtml pages. */ @Column(name = "CLOSABLE") private String closable = "true"; /** * This is an override to change the CSS style on the widget. */ @Column(name = "STYLE") private String style; /** * Determines what part of the widget can be grabbed with the cursor to * move it around. The default will be the header of the widget. */ @Column(name = "HANDLE") private String handle = ".ui-panel-titlebar"; /** * Determines the transparency of the widget while it is being dragged. * This is a decimal number between 0 and 1. The default will be 1. */ @Column(name = "OPACITY") private String opacity = "1"; /** * This is the form object that the widget will be loaded into. This will * be defaulted to widgetTemplate.xhtml. It can be overwritten in the * extended classes. */ @Column(name="FORM") private String xhtmlForm = ""; public WidgetList getCurrentWidgetList() { return currentWidgetList; } public void setCurrentWidgetList(WidgetList widgetList) { this.currentWidgetList = widgetList; } public String getClosable() { return closable; } public String getHandle() { return handle; } public String getHeaderName() { return headerName; } public int getId() { return id; } public String getIdName() { return idName; } public String getOpacity() { return opacity; } public String getStyle() { return style; } public String getToggleable() { return toggleable; } public String getXhtmlForm() { return xhtmlForm; } public void setClosable(String closable) { this.closable = closable; } public void setHandle(String handle) { this.handle = handle; } public void setHeaderName(String headerName) { this.headerName = headerName; } public void setId(int id) { this.id = id; } public void setIdName(String idName) { this.idName = idName; } public void setOpacity(String opacity) { this.opacity = opacity; } public void setStyle(String style) { this.style = style; } public void setToggleable(String toggleable) { this.toggleable = toggleable; } public void setXhtmlForm(String xhtmlForm) { this.xhtmlForm = xhtmlForm; } } </code></pre> <p>This was written in Java EE 6, using JPA, deploying to a Glassfish 3.0.1 server using a MySQL database. I use NetBeans 6.9.1 as my development environment, with jdk 1.6.0_20 installed on my machine. We use this version due to dependencies we have with older software that we are still maintaining.</p> <p>My understanding of the issue is that the @Id annotated field "id" on the WidgetList class is being identified as read-only. I have attempted to manually force it to recognize it as a non-read-only field via my use of the @Column annotation, but to no avail.</p> <p>I've been hunting through the oracle forums, here at stackoverflow and anywhere google can take me, but I have had absolutely no luck in finding a solution. I had high hopes for the <a href="http://wiki.eclipse.org/EclipseLink_Exception_Error_Reference_%28ELUG%29" rel="nofollow">EclipseLink wiki page</a>, but it has proved to be a bust as well. The actual error description tells me nothing.</p> <p>If anyone has any ideas at all, they would be greatly appreciated.</p> <p>Thanks, Matt Tatham</p>
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