java Hibernate：实体内部类没有默认构造函数
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时间：2020-11-02 12:56:21 来源:igfitidea点击:
Hibernate: No default constructor for entity Inner Class
提问by liltitus27
I realize there are many similar questions, but none have helped me along on this.
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。
I'm using a CRUD framework called Tynamo, which in turn relies on Apache Tapestry and Hibernate. This all works fine, except for when I try to use it for CRUD on a table with a composite/compound primary key.
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。
I've decided not to go the @EmbeddedIdroute, since it seems to not work at all with the framework. That being said, I have been using the @IdClassmethod, which is mostly working; I think I'm a line or two of code away from success.
我决定不走这@EmbeddedId条路，因为它似乎根本不适用于该框架。话虽如此，我一直在使用该@IdClass方法，该方法主要是有效的；我想我离成功还有一两行代码。
The issue is that when it starts using reflection to build the objects, it blows up and says, org.hibernate.InstantiationException: No default constructor for entity: ..., even though there is, indeed, a public, empty constructor for that inner class.
问题是，当它开始使用反射来构建对象时，它会崩溃并说：org.hibernate.InstantiationException: No default constructor for entity: ...，即使该内部类确实有一个公共的空构造函数。
When answering, please avoid code snippets, and use full classes, etc. so that others visiting this thread can have a more complete picture of what's going on.
回答时，请避免代码片段，并使用完整的类等，以便访问此线程的其他人可以更完整地了解正在发生的事情。
You can see my class below:
你可以在下面看到我的课程：
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;
}
}
}
Stack Trace:
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.renderMarkup(TapestryModule.java:1994)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1978)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1960)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1945)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1931)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1913)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.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.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.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.service(TapestryModule.java:902)
at $RequestHandler_f31f9af2ac5.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.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.invoke(CheckForUpdatesFilter.java:105)
at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.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.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$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.hibernate.InstantiationException: No default constructor for entity: com.company.crud.entities.TransferExtension$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.renderMarkup(TapestryModule.java:1994)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1978)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1960)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1945)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1931)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.renderMarkup(TapestryModule.java:1913)
at $MarkupRenderer_f31f9af2be1.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.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.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.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.service(TapestryModule.java:902)
at $RequestHandler_f31f9af2ac5.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule.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.invoke(CheckForUpdatesFilter.java:105)
at org.apache.tapestry5.internal.services.CheckForUpdatesFilter.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.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$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:696)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:744)
Caused by: org.apache.tapestry5.ioc.internal.util.TapestryException: No default constructor for entity: com.company.crud.entities.TransferExtension$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
回答by gknicker
Under the covers, TransferExtensionPKactually has no default constructor because it's an inner class. Inner classes require an instance of their outer class in order to be constructed, so the compiler has translated your no-parameter constructor into a one-parameter constructor which accepts an instance of TransferExtension.
在幕后，TransferExtensionPK实际上没有默认构造函数，因为它是一个内部类。内部类需要其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.
To fix the problem, make TransferExtensionPKmerely a nested class (static) rather than an inner class:
要解决这个问题，TransferExtensionPK只需创建一个嵌套类（静态）而不是内部类：
public static class TransferExtensionPK // etc
