[英]Returning an entity via remote EJB results in - java.lang.NullPointerException at com.sun.corba.ee.impl.orbutil.ClassInfoCache$ClassInfo.<init>
我正在嘗試在以下環境中創建企業Web應用程序。
我創建了一個類庫（新項目 - > Java - > Java類庫）來放置遠程（ javax.ejb.Remote ）接口，該接口由無狀態會話bean實現。 類庫已添加到兩個模塊（EJB和WAR）的類路徑中。
我已將遠程接口和所有實體類放在類庫中（我不知道這是方法）。
這適用於使用@Local注釋的接口。 它甚至可以與@Remote但是當我嘗試返回實體的對象列表時，當JPA涉及時，它會失敗並出現以下異常。
java.rmi.MarshalException：CORBA MARSHAL 1330446347也許; 嵌套異常是：org.omg.CORBA.MARSHAL：警告：IOP00810011：CDRInputStream中的ValueHandler上的readValue異常vmcid：OMG次代碼：11完成：也許
完整的堆棧跟蹤。
javax.ejb.EJBException: java.rmi.MarshalException: CORBA MARSHAL 1330446347 Maybe; nested exception is:
org.omg.CORBA.MARSHAL: WARNING: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream vmcid: OMG minor code: 11 completed: Maybe
at remote.admin.sessionbeans._AdminRemoteSessionBeanRemote_Wrapper.getZones(remote/admin/sessionbeans/_AdminRemoteSessionBeanRemote_Wrapper.java)
at managedbeans.ZoneBean.getZones(ZoneBean.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:363)
at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
at com.sun.el.parser.AstValue.getValue(AstValue.java:183)
at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
at javax.faces.component.UIData.getValue(UIData.java:731)
at javax.faces.component.UIData.getDataModel(UIData.java:1798)
at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
at javax.faces.component.UIData.setRowIndex(UIData.java:473)
at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1755)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.rmi.MarshalException: CORBA MARSHAL 1330446347 Maybe; nested exception is:
org.omg.CORBA.MARSHAL: WARNING: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream vmcid: OMG minor code: 11 completed: Maybe
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.mapSystemException(Util.java:267)
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.wrapException(Util.java:696)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:259)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:152)
at com.sun.corba.ee.impl.presentation.rmi.codegen.CodegenStubBase.invoke(CodegenStubBase.java:227)
at remote.admin.sessionbeans.__AdminRemoteSessionBeanRemote_Remote_DynamicStub.getZones(remote/admin/sessionbeans/__AdminRemoteSessionBeanRemote_Remote_DynamicStub.java)
... 55 more
Caused by: org.omg.CORBA.MARSHAL: WARNING: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream vmcid: OMG minor code: 11 completed: Maybe
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.sun.corba.ee.spi.orbutil.logex.corba.CorbaExtension.makeException(CorbaExtension.java:248)
at com.sun.corba.ee.spi.orbutil.logex.corba.CorbaExtension.makeException(CorbaExtension.java:95)
at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator.handleFullLogging(WrapperGenerator.java:387)
at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator.access$400(WrapperGenerator.java:107)
at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator$2.invoke(WrapperGenerator.java:511)
at com.sun.corba.ee.spi.orbutil.proxy.CompositeInvocationHandlerImpl.invoke(CompositeInvocationHandlerImpl.java:99)
at $Proxy193.valuehandlerReadException(Unknown Source)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1022)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123)
at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531)
at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:2162)
at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2404)
at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1224)
at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:425)
at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:308)
at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:935)
at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:525)
at com.sun.corba.ee.impl.copyobject.ORBStreamObjectCopierImpl.copy(ORBStreamObjectCopierImpl.java:78)
at com.sun.corba.ee.impl.copyobject.ORBStreamObjectCopierImpl.copy(ORBStreamObjectCopierImpl.java:65)
at com.sun.corba.ee.impl.orbutil.copyobject.FallbackObjectCopierImpl.copy(FallbackObjectCopierImpl.java:69)
at com.sun.corba.ee.impl.orbutil.copyobject.FallbackObjectCopierImpl.copy(FallbackObjectCopierImpl.java:59)
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.copyObject(Util.java:771)
at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl.copyResult(DynamicMethodMarshallerImpl.java:473)
at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:243)
... 58 more
Caused by: java.lang.NullPointerException
at com.sun.corba.ee.impl.orbutil.ClassInfoCache$ClassInfo.<init>(ClassInfoCache.java:156)
at com.sun.corba.ee.impl.orbutil.ClassInfoCache.get(ClassInfoCache.java:281)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1097)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:935)
at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:525)
at com.sun.corba.ee.impl.corba.TCUtility.unmarshalIn(TCUtility.java:289)
at com.sun.corba.ee.impl.corba.AnyImpl.read_value(AnyImpl.java:605)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:775)
at com.sun.corba.ee.impl.encoding.CDRInputObject.read_any(CDRInputObject.java:482)
at com.sun.corba.ee.impl.javax.rmi.CORBA.Util.readAny(Util.java:452)
at com.sun.corba.ee.impl.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:639)
at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:305)
at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274)
at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015)
... 77 more
遠程接口：
@Remote
public interface AdminRemoteSessionBeanRemote {
public List<Zone>getZones();
public int sum(int a, int b);
}
實現上述接口的無狀態會話bean：
@Stateless
public class AdminRemoteSessionBean implements AdminRemoteSessionBeanRemote {
@PersistenceContext(unitName="unit-name")
private EntityManager entityManager;
@Override
public List<Zone> getZones() {
return entityManager.createNamedQuery("Zone.findAll").getResultList();
}
@Override
public int sum(int a, int b) {
return a + b;
}
}
JSF托管bean：
@ManagedBean
@RequestScoped
public class ZoneBean {
@EJB//(mappedName="remote.admin.sessionbeans.AdminRemoteSessionBeanRemote")
private AdminRemoteSessionBeanRemote adminRemoteSessionBeanRemote;
private List<Zone>zones;
private int sum;
public ZoneBean(){}
public List<Zone> getZones() {
zones=adminRemoteSessionBeanRemote.getZones();
return zones;
}
public void setZones(List<Zone> zones) {
this.zones = zones;
}
public int getSum() {
sum=adminRemoteSessionBeanRemote.sum(10, 15);
return sum;
}
public void setSum(int sum) {
this.sum = sum;
}
}
剛返回int的sum()方法僅用於演示。 它按原樣工作。
當涉及實體時會出現問題，如在EJB中的public List<Zone> getZones()方法中可以看到的那樣導致如上所述的異常。
AdminClassLibrary （ 快照中突出顯示的節點）是包含遠程接口和實體類的類庫。
如何通過EJB會話bean中的getZones()方法返回java.util.List<entities.Zone> ？
我點擊了Google顯示的有關此例外的所有鏈接，但無法解決此問題。
Zone實體。
@Entity
@Table(name = "ZONE", catalog = "", schema = "PROJECTDB")
@XmlRootElement
@NamedQueries({
@NamedQuery(name = "Zone.findAll", query = "SELECT z FROM Zone z ORDER BY z.zoneId DESC"),
@NamedQuery(name = "Zone.findByZoneId", query = "SELECT z FROM Zone z WHERE z.zoneId = :zoneId"),
@NamedQuery(name = "Zone.findByZone", query = "SELECT z FROM Zone z WHERE z.zone = :zone")})
public class Zone implements Serializable {
private static final long serialVersionUID = 1L;
// @Max(value=?) @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
@Id
@Basic(optional = false)
@NotNull
@Column(name = "ZONE_ID")
private BigDecimal zoneId;
@Size(max = 50)
@Column(name = "ZONE")
private String zone;
@OneToMany(mappedBy = "zoneId", fetch = FetchType.LAZY)
private List<Country> countryList;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "zone", fetch = FetchType.LAZY)
private List<ZoneCharge> zoneChargeList;
@JoinColumn(name = "TRANSPORTER_ID", referencedColumnName = "TRANSPORTER_ID")
@ManyToOne(fetch = FetchType.LAZY)
private Transporter transporterId;
//Getters and setters + constructor(s) + equals() + hashcode()
}
問題在於Zone類實例的反序列化。 它應該是Serializable ，應該存在於客戶端和服務器（本地和遠程）。 這將強制依賴於將持久性庫添加到遠程服務器。 因此最好不要發送持久性實體。
我剛剛遇到了這個問題的一個例子。 我調用的遠程方法引發了異常（實際上是PSQLException）。 我認為PSQLException被包裝並最終序列化並發送給我的客戶端。 我的客戶端在其類路徑中沒有PSQLException，這似乎在CORBA的內容中沒有得到很好的處理。
我通過將調試器掛鈎到客戶端應用程序並將構造函數上的斷點放到NullPointerException來診斷出這一點。 然后我能夠看到在拋出異常時正在反序列化哪個類。
祝好運！
在嘗試從遠程ejb調用獲取實體集合后，我也得到了錯誤堆棧跟蹤。 將jdk升級到1.8_60及以上完全解決了這個問題。 沒有錯誤堆棧，它現在運行得很好。 這個bug已經被處理了
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