java - Hibernate:实体内部类没有默认构造函数-6ren

java - Hibernate:实体内部类没有默认构造函数

转载作者：塔克拉玛干更新时间：2023-11-03 03:32:30

我意识到有很多类似的问题，但没有一个能帮助我解决这个问题。

我正在使用一个名为 Tynamo 的 CRUD 框架，它又依赖于 Apache Tapestry 和 Hibernate。这一切都很好，除了当我尝试将它用于具有复合/复合主键的表上的 CRUD 时。

我决定不采用 @EmbeddedId 路线，因为它似乎根本不适用于该框架。话虽如此，我一直在使用 @IdClass 方法，该方法大部分都有效；我认为我距离成功只有一两行代码。

问题是，当它开始使用反射来构建对象时，它会爆炸并说，org.hibernate.InstantiationException: No default constructor for entity: ...，即使有，确实是该内部类的公共(public)空构造函数。

回答时，请避免使用代码片段，并使用完整类等，以便访问此线程的其他人可以更全面地了解正在发生的事情。

你可以在下面看到我的类(class):

package com.company.crud.entities;

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;

import com.company.crud.entities.TransferExtension.TransferExtensionPK;

@Entity(name = "Transfer_Extensions")
@IdClass(TransferExtensionPK.class)
public class TransferExtension implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    // @NotNull(message = "Please supply a Script Code")
    // @Length(min = 3, max = 4)
    @Column(name = "Division", nullable = false)
    private String scriptCode;

    @Id
    // @NotNull(message = "Please supply a Transfer Type")
    // @Length(min = 3, max = 6)
    @Column(name = "Transfer_Type", nullable = false)
    private String transferType;

    @Column(name = "Extension", nullable = true)
    private String englishExtension;

    @Column(name = "Span_Extension", nullable = true)
    private String spanishExtension;

    @Column(name = "Call_Type", nullable = true)
    private String callType;

    @Column(name = "Call_Center", nullable = true)
    private String callCenter;

    public TransferExtension() {
    }

    public TransferExtension(String scriptCode, String transferType,
            String englishExtension, String spanishExtension, String callType,
            String callCenter) {

        this.callCenter = callCenter;
        this.callType = callType;
        this.englishExtension = englishExtension;
        this.scriptCode = scriptCode;
        this.spanishExtension = spanishExtension;
        this.transferType = transferType;
    }

    public String getScriptCode() {
        return this.scriptCode;
    }

    public void setScriptCode(String scriptCode) {
        this.scriptCode = scriptCode;
    }

    public String getTransferType() {
        return this.transferType;
    }

    public void setTransferType(String transferType) {
        this.transferType = transferType;
    }

    public String getEnglishExtension() {
        return this.englishExtension;
    }

    public void setEnglishExtension(String englishExtension) {
        this.englishExtension = englishExtension;
    }

    public String getSpanishExtension() {
        return this.spanishExtension;
    }

    public void setSpanishExtension(String spanishExtension) {
        this.spanishExtension = spanishExtension;
    }

    public String getCallType() {
        return this.callType;
    }

    public void setCallType(String callType) {
        this.callType = callType;
    }

    public String getCallCenter() {
        return this.callCenter;
    }

    public void setCallCenter(String callCenter) {
        this.callCenter = callCenter;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("TransferExtension [scriptCode=")
                .append(this.scriptCode).append(", transferType=")
                .append(this.transferType).append(", englishExtension=")
                .append(this.englishExtension).append(", spanishExtension=")
                .append(this.spanishExtension).append(", callType=")
                .append(this.callType).append(", callCenter=")
                .append(this.callCenter).append("]");
        return builder.toString();
    }

    public class TransferExtensionPK implements Serializable {
        private static final long serialVersionUID = 4L;

        private String scriptCode;
        private String transferType;

        public TransferExtensionPK() {
        }

        public TransferExtensionPK(String scriptCode, String transferType) {

            this.scriptCode = scriptCode;
            this.transferType = transferType;
        }

        public String getScriptCode() {
            return this.scriptCode;
        }

        public void setScriptCode(String scriptCode) {
            this.scriptCode = scriptCode;
        }

        public String getTransferType() {
            return this.transferType;
        }

        public void setTransferType(String transferType) {
            this.transferType = transferType;
        }

        @Override
        public String toString() {
            StringBuilder builder = new StringBuilder();
            builder.append("TransferExtensionPK [scriptCode=")
                    .append(this.scriptCode).append(", transferType=")
                    .append(this.transferType).append("]");
            return builder.toString();
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + getOuterType().hashCode();
            result = prime
                    * result
                    + ((this.scriptCode == null) ? 0 : this.scriptCode
                            .hashCode());
            result = prime
                    * result
                    + ((this.transferType == null) ? 0 : this.transferType
                            .hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj) {
                return true;
            }
            if (obj == null) {
                return false;
            }
            if (!(obj instanceof TransferExtensionPK)) {
                return false;
            }
            TransferExtensionPK other = (TransferExtensionPK) obj;
            if (!getOuterType().equals(other.getOuterType())) {
                return false;
            }
            if (this.scriptCode == null) {
                if (other.scriptCode != null) {
                    return false;
                }
            } else if (!this.scriptCode.equals(other.scriptCode)) {
                return false;
            }
            if (this.transferType == null) {
                if (other.transferType != null) {
                    return false;
                }
            } else if (!this.transferType.equals(other.transferType)) {
                return false;
            }
            return true;
        }

        private TransferExtension getOuterType() {
            return TransferExtension.this;
        }
    }
}

堆栈跟踪:

Hibernate: 
    select
        count(*) as y0_ 
    from
        Transfer_Extensions this_
Hibernate: 
    select
        top 25 this_.Division as Division1_0_,
        this_.Transfer_Type as Transfer2_1_0_,
        this_.Call_Center as Call3_1_0_,
        this_.Call_Type as Call4_1_0_,
        this_.Extension as Extension1_0_,
        this_.Span_Extension as Span6_1_0_ 
    from
        Transfer_Extensions this_
[ERROR] pages.List Render queue error in SetupRender[List:grid]: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK
org.apache.tapestry5.ioc.internal.util.TapestryException: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK [at context:List.tml, line 12]
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:158)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$SetupRenderPhase.render(ComponentPageElementImpl.java:186)
    at org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
    at org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:124)
    at $PageRenderQueue_f31f9af2bde.render(Unknown Source)
    at $PageRenderQueue_f31f9af2bdd.render(Unknown Source)
    at org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37)
    at org.apache.tapestry5.services.TapestryModule$31.renderMarkup(TapestryModule.java:1994)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$30.renderMarkup(TapestryModule.java:1978)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:1960)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:1945)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$27.renderMarkup(TapestryModule.java:1931)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$26.renderMarkup(TapestryModule.java:1913)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$25.renderMarkup(TapestryModule.java:1894)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at $MarkupRenderer_f31f9af2bdc.renderMarkup(Unknown Source)
    at org.apache.tapestry5.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:47)
    at $PageMarkupRenderer_f31f9af2bd5.renderPageMarkup(Unknown Source)
    at org.apache.tapestry5.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:67)
    at $PageResponseRenderer_f31f9af2bd7.advised$renderPageResponse_f31f9af2bd9(Unknown Source)
    at $PageResponseRenderer_f31f9af2bd7$Invocation_renderPageResponse_f31f9af2bd8.proceedToAdvisedMethod(Unknown Source)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
    at org.tynamo.services.TynamoCoreModule$2.advise(TynamoCoreModule.java:353)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
    at $PageResponseRenderer_f31f9af2bd7.renderPageResponse(Unknown Source)
    at $PageResponseRenderer_f31f9af2bd0.renderPageResponse(Unknown Source)
    at org.apache.tapestry5.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:64)
    at org.apache.tapestry5.services.TapestryModule$38.handle(TapestryModule.java:2222)
    at $PageRenderRequestHandler_f31f9af2bd2.handle(Unknown Source)
    at $PageRenderRequestHandler_f31f9af2bcd.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handlePageRender(ComponentRequestHandlerTerminator.java:48)
    at org.apache.tapestry5.services.InitializeActivePageName.handlePageRender(InitializeActivePageName.java:47)
    at $ComponentRequestHandler_f31f9af2bce.handlePageRender(Unknown Source)
    at $ComponentRequestHandler_f31f9af2ac7.handlePageRender(Unknown Source)
    at org.tynamo.routing.services.RouterDispatcher.dispatch(RouterDispatcher.java:26)
    at $Dispatcher_f31f9af2acb.dispatch(Unknown Source)
    at $Dispatcher_f31f9af2ac4.dispatch(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
    at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:105)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:95)
    at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:119)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at $RequestHandler_f31f9af2ab9.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
    at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    at $HttpServletRequestFilter_f31f9af2ab7.service(Unknown Source)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at $HttpServletRequestHandler_f31f9af2ab5.service(Unknown Source)
    at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.hibernate.InstantiationException: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK
    at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:107)
    at org.hibernate.tuple.component.AbstractComponentTuplizer.instantiate(AbstractComponentTuplizer.java:102)
    at org.hibernate.type.ComponentType.instantiate(ComponentType.java:511)
    at org.hibernate.type.ComponentType.instantiate(ComponentType.java:517)
    at org.hibernate.type.EmbeddedComponentType.instantiate(EmbeddedComponentType.java:59)
    at org.hibernate.type.ComponentType.resolve(ComponentType.java:609)
    at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:722)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606)
    at org.hibernate.loader.Loader.doQuery(Loader.java:829)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
    at org.hibernate.loader.Loader.doList(Loader.java:2533)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
    at org.hibernate.loader.Loader.list(Loader.java:2271)
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1716)
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:349)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:333)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:172)
    at $HibernatePersistenceService_f31f9af2bf1.getInstances(Unknown Source)
    at $HibernatePersistenceService_f31f9af2b41.getInstances(Unknown Source)
    at org.tynamo.TynamoGridDataSource.prepare(TynamoGridDataSource.java:58)
    at org.apache.tapestry5.corelib.components.Grid$CachingDataSource.prepare(Grid.java:313)
    at org.apache.tapestry5.corelib.components.Grid.setupDataSource(Grid.java:483)
    at org.apache.tapestry5.corelib.components.Grid.setupRender(Grid.java:447)
    at org.apache.tapestry5.corelib.components.Grid.setupRender(Grid.java)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$SetupRenderPhase.invokeComponent(ComponentPageElementImpl.java:179)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:148)
    ... 94 more
[INFO] InternalModule.PageResponseRenderer discarding all List page persistent field changes due to a RenderQueueException
[ERROR] TapestryModule.RequestExceptionHandler Processing of request failed with uncaught exception: Render queue error in SetupRender[List:grid]: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK
org.apache.tapestry5.internal.services.RenderQueueException: Render queue error in SetupRender[List:grid]: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK [at context:List.tml, line 12]
    at org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:81)
    at org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:124)
    at $PageRenderQueue_f31f9af2bde.render(Unknown Source)
    at $PageRenderQueue_f31f9af2bdd.render(Unknown Source)
    at org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37)
    at org.apache.tapestry5.services.TapestryModule$31.renderMarkup(TapestryModule.java:1994)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$30.renderMarkup(TapestryModule.java:1978)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:1960)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:1945)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$27.renderMarkup(TapestryModule.java:1931)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$26.renderMarkup(TapestryModule.java:1913)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$25.renderMarkup(TapestryModule.java:1894)
    at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
    at $MarkupRenderer_f31f9af2bdc.renderMarkup(Unknown Source)
    at org.apache.tapestry5.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:47)
    at $PageMarkupRenderer_f31f9af2bd5.renderPageMarkup(Unknown Source)
    at org.apache.tapestry5.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:67)
    at $PageResponseRenderer_f31f9af2bd7.advised$renderPageResponse_f31f9af2bd9(Unknown Source)
    at $PageResponseRenderer_f31f9af2bd7$Invocation_renderPageResponse_f31f9af2bd8.proceedToAdvisedMethod(Unknown Source)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:84)
    at org.tynamo.services.TynamoCoreModule$2.advise(TynamoCoreModule.java:353)
    at org.apache.tapestry5.internal.plastic.AbstractMethodInvocation.proceed(AbstractMethodInvocation.java:86)
    at $PageResponseRenderer_f31f9af2bd7.renderPageResponse(Unknown Source)
    at $PageResponseRenderer_f31f9af2bd0.renderPageResponse(Unknown Source)
    at org.apache.tapestry5.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:64)
    at org.apache.tapestry5.services.TapestryModule$38.handle(TapestryModule.java:2222)
    at $PageRenderRequestHandler_f31f9af2bd2.handle(Unknown Source)
    at $PageRenderRequestHandler_f31f9af2bcd.handle(Unknown Source)
    at org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handlePageRender(ComponentRequestHandlerTerminator.java:48)
    at org.apache.tapestry5.services.InitializeActivePageName.handlePageRender(InitializeActivePageName.java:47)
    at $ComponentRequestHandler_f31f9af2bce.handlePageRender(Unknown Source)
    at $ComponentRequestHandler_f31f9af2ac7.handlePageRender(Unknown Source)
    at org.tynamo.routing.services.RouterDispatcher.dispatch(RouterDispatcher.java:26)
    at $Dispatcher_f31f9af2acb.dispatch(Unknown Source)
    at $Dispatcher_f31f9af2ac4.dispatch(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
    at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:105)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:95)
    at org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
    at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:119)
    at $RequestHandler_f31f9af2ac5.service(Unknown Source)
    at $RequestHandler_f31f9af2ab9.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
    at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
    at $HttpServletRequestFilter_f31f9af2ab7.service(Unknown Source)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
    at $HttpServletRequestHandler_f31f9af2abb.service(Unknown Source)
    at $HttpServletRequestHandler_f31f9af2ab5.service(Unknown Source)
    at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1476)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:429)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
    at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:53)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK [at context:List.tml, line 12]
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:158)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$SetupRenderPhase.render(ComponentPageElementImpl.java:186)
    at org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
    ... 92 more
Caused by: org.hibernate.InstantiationException: No default constructor for entity: com.company.crud.entities.TransferExtension$TransferExtensionPK
    at org.hibernate.tuple.PojoInstantiator.instantiate(PojoInstantiator.java:107)
    at org.hibernate.tuple.component.AbstractComponentTuplizer.instantiate(AbstractComponentTuplizer.java:102)
    at org.hibernate.type.ComponentType.instantiate(ComponentType.java:511)
    at org.hibernate.type.ComponentType.instantiate(ComponentType.java:517)
    at org.hibernate.type.EmbeddedComponentType.instantiate(EmbeddedComponentType.java:59)
    at org.hibernate.type.ComponentType.resolve(ComponentType.java:609)
    at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:722)
    at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606)
    at org.hibernate.loader.Loader.doQuery(Loader.java:829)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
    at org.hibernate.loader.Loader.doList(Loader.java:2533)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
    at org.hibernate.loader.Loader.list(Loader.java:2271)
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1716)
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:349)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:333)
    at org.tynamo.hibernate.services.HibernatePersistenceServiceImpl.getInstances(HibernatePersistenceServiceImpl.java:172)
    at $HibernatePersistenceService_f31f9af2bf1.getInstances(Unknown Source)
    at $HibernatePersistenceService_f31f9af2b41.getInstances(Unknown Source)
    at org.tynamo.TynamoGridDataSource.prepare(TynamoGridDataSource.java:58)
    at org.apache.tapestry5.corelib.components.Grid$CachingDataSource.prepare(Grid.java:313)
    at org.apache.tapestry5.corelib.components.Grid.setupDataSource(Grid.java:483)
    at org.apache.tapestry5.corelib.components.Grid.setupRender(Grid.java:447)
    at org.apache.tapestry5.corelib.components.Grid.setupRender(Grid.java)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$SetupRenderPhase.invokeComponent(ComponentPageElementImpl.java:179)
    at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:148)
    ... 94 more

最佳答案

在幕后，TransferExtensionPK 实际上没有默认构造函数，因为它是一个内部类。内部类需要外部类的实例才能构造，因此编译器已将您的无参数构造函数转换为接受 TransferExtension 实例的单参数构造函数。

要解决此问题，请将 TransferExtensionPK 设为嵌套类(静态)而不是内部类:

public static class TransferExtensionPK // etc

关于java - Hibernate:实体内部类没有默认构造函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28053135/

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java - Hibernate:实体内部类没有默认构造函数