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.
I've decided not to go the @EmbeddedId route, since it seems to not work at all with the framework. That being said, I have been using the @IdClass method, which is mostly working; I think I'm a line or two of code away from success.
The issue is that when it starts using reflection to build the objects, it blows up and says, org.apache.tapestry5.ioc.internal.util.TapestryException, caused by java.lang.NullPointerException at org.apache.tapestry5.internal.hibernate.HibernateEntityValueEncoder.<init>(HibernateEntityValueEncoder.java:51).
I honestly have no idea what's the deal here, but since I have normal table CRUD operation working for numerous other tables, I would assume this is somehow related to this table using a composite/compound primary key.
One thing I did try was to move the static inner class to its own package and remove the static class modifier, but the exact same error occurred.
You can see my class below:
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 static 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
+ ((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 (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;
}
}
}
And the stack trace:
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 BeginRender[List:pagelink_0]: org.apache.tapestry5.ioc.internal.util.TapestryException
org.apache.tapestry5.ioc.internal.util.TapestryException [at context:List.tml, line 16]
at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:158)
at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.render(ComponentPageElementImpl.java:214)
at org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:72)
at org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:124)
at $PageRenderQueue_11b9cd02019b.render(Unknown Source)
at $PageRenderQueue_11b9cd02019a.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_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$30.renderMarkup(TapestryModule.java:1978)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$29.renderMarkup(TapestryModule.java:1960)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$28.renderMarkup(TapestryModule.java:1945)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$27.renderMarkup(TapestryModule.java:1931)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$26.renderMarkup(TapestryModule.java:1913)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$25.renderMarkup(TapestryModule.java:1894)
at $MarkupRenderer_11b9cd02019e.renderMarkup(Unknown Source)
at $MarkupRenderer_11b9cd020199.renderMarkup(Unknown Source)
at org.apache.tapestry5.internal.services.PageMarkupRendererImpl.renderPageMarkup(PageMarkupRendererImpl.java:47)
at $PageMarkupRenderer_11b9cd020192.renderPageMarkup(Unknown Source)
at org.apache.tapestry5.internal.services.PageResponseRendererImpl.renderPageResponse(PageResponseRendererImpl.java:67)
at $PageResponseRenderer_11b9cd020194.advised$renderPageResponse_11b9cd020196(Unknown Source)
at $PageResponseRenderer_11b9cd020194$Invocation_renderPageResponse_11b9cd020195.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_11b9cd020194.renderPageResponse(Unknown Source)
at $PageResponseRenderer_11b9cd020189.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_11b9cd02018b.handle(Unknown Source)
at $PageRenderRequestHandler_11b9cd020186.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_11b9cd020187.handlePageRender(Unknown Source)
at $ComponentRequestHandler_11b9cd020080.handlePageRender(Unknown Source)
at org.tynamo.routing.services.RouterDispatcher.dispatch(RouterDispatcher.java:26)
at $Dispatcher_11b9cd020084.dispatch(Unknown Source)
at $Dispatcher_11b9cd02007d.dispatch(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:302)
at org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
at $RequestHandler_11b9cd02007e.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:902)
at $RequestHandler_11b9cd02007e.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$2.service(TapestryModule.java:892)
at $RequestHandler_11b9cd02007e.service(Unknown Source)
at org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:90)
at $RequestHandler_11b9cd02007e.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_11b9cd02007e.service(Unknown Source)
at $RequestHandler_11b9cd020072.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:253)
at org.apache.tapestry5.internal.gzip.GZipFilter.service(GZipFilter.java:53)
at $HttpServletRequestHandler_11b9cd020074.service(Unknown Source)
at org.apache.tapestry5.upload.internal.services.MultipartServletRequestFilter.service(MultipartServletRequestFilter.java:44)
at $HttpServletRequestHandler_11b9cd020074.service(Unknown Source)
at org.apache.tapestry5.internal.services.IgnoredPathsFilter.service(IgnoredPathsFilter.java:62)
at $HttpServletRequestFilter_11b9cd020070.service(Unknown Source)
at $HttpServletRequestHandler_11b9cd020074.service(Unknown Source)
at org.apache.tapestry5.services.TapestryModule$1.service(TapestryModule.java:852)
at $HttpServletRequestHandler_11b9cd020074.service(Unknown Source)
at $HttpServletRequestHandler_11b9cd02006e.service(Unknown Source)
at org.apache.tapestry5.TapestryFilter.doFilter(TapestryFilter.java:171)
at org.eclipse.jetty.servlet.ServletHandler$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: java.lang.NullPointerException
at org.apache.tapestry5.internal.hibernate.HibernateEntityValueEncoder.<init>(HibernateEntityValueEncoder.java:51)
at org.apache.tapestry5.hibernate.HibernateModule$1.create(HibernateModule.java:103)
at org.apache.tapestry5.internal.services.ValueEncoderSourceImpl.getValueEncoder(ValueEncoderSourceImpl.java:48)
at $ValueEncoderSource_11b9cd0200bf.getValueEncoder(Unknown Source)
at org.apache.tapestry5.internal.services.ContextValueEncoderImpl.toClient(ContextValueEncoderImpl.java:35)
at $ContextValueEncoder_11b9cd0200cd.toClient(Unknown Source)
at org.apache.tapestry5.internal.services.ContextPathEncoderImpl.encodeValue(ContextPathEncoderImpl.java:48)
at org.apache.tapestry5.internal.services.ContextPathEncoderImpl.encodeIntoPath(ContextPathEncoderImpl.java:72)
at $ContextPathEncoder_11b9cd02008f.encodeIntoPath(Unknown Source)
at org.apache.tapestry5.internal.services.ComponentEventLinkEncoderImpl.appendContext(ComponentEventLinkEncoderImpl.java:516)
at org.apache.tapestry5.internal.services.ComponentEventLinkEncoderImpl.createPageRenderLink(ComponentEventLinkEncoderImpl.java:103)
at org.apache.tapestry5.internal.services.linktransform.LinkTransformerInterceptor.createPageRenderLink(LinkTransformerInterceptor.java:50)
at $ComponentEventLinkEncoder_11b9cd020082.createPageRenderLink(Unknown Source)
at org.apache.tapestry5.internal.services.LinkSourceImpl.createPageRenderLink(LinkSourceImpl.java:119)
at $LinkSource_11b9cd0200ce.createPageRenderLink(Unknown Source)
at org.apache.tapestry5.internal.structure.ComponentPageElementResourcesImpl.createPageRenderLink(ComponentPageElementResourcesImpl.java:111)
at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.createPageLink(ComponentPageElementImpl.java:1271)
at org.apache.tapestry5.internal.structure.InternalComponentResourcesImpl.createPageLink(InternalComponentResourcesImpl.java:221)
at org.apache.tapestry5.corelib.components.PageLink.beginRender(PageLink.java:57)
at org.apache.tapestry5.corelib.components.PageLink.beginRender(PageLink.java)
at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.invokeComponent(ComponentPageElementImpl.java:207)
at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.invoke(ComponentPageElementImpl.java:138)
... 94 more
Here's my ValueEncoder class:
import org.apache.tapestry5.ValueEncoder;
import org.apache.tapestry5.services.ValueEncoderFactory;
import com.company.ivr.crud.entities.TransferExtension.TransferExtensionPK;
public class TransferExtensionPKValueEncoder implements
ValueEncoderFactory<TransferExtensionPK>,
ValueEncoder<TransferExtensionPK> {
public ValueEncoder<TransferExtensionPK> create(
Class<TransferExtensionPK> type) {
return this;
}
public String toClient(TransferExtensionPK value) {
return value.getScriptCode() + ":" + value.getTransferType();
}
public TransferExtensionPK toValue(String clientValue) {
String[] values = clientValue.split(":");
return new TransferExtensionPK(values[0], values[1]);
}
}
Here's the AppModule class:
package com.company.crud.services;
import org.apache.tapestry5.SymbolConstants;
import org.apache.tapestry5.ValueEncoder;
import org.apache.tapestry5.hibernate.HibernateEntityPackageManager;
import org.apache.tapestry5.ioc.Configuration;
import org.apache.tapestry5.ioc.MappedConfiguration;
import org.apache.tapestry5.ioc.ServiceBinder;
import org.apache.tapestry5.ioc.annotations.Contribute;
import org.apache.tapestry5.ioc.services.ApplicationDefaults;
import org.apache.tapestry5.ioc.services.FactoryDefaults;
import org.apache.tapestry5.ioc.services.SymbolProvider;
import org.apache.tapestry5.services.BeanBlockContribution;
import org.apache.tapestry5.services.BeanBlockSource;
import org.apache.tapestry5.services.DisplayBlockContribution;
import org.apache.tapestry5.services.ValueEncoderFactory;
import org.apache.tapestry5.upload.services.UploadSymbols;
import org.tynamo.builder.Builder;
import org.tynamo.builder.BuilderDirector;
import com.company.crud.encoders.TransferExtensionPKValueEncoder;
import com.company.crud.entities.TransferExtension.TransferExtensionPK;
public class AppModule {
/*
* This is the method I've added.
*/
// @Contribute(ValueEncoderSource.class)
public static void contributeValueEncoderSource(
MappedConfiguration<Class<?>, ValueEncoderFactory<?>> config) {
config.addInstance(TransferExtensionPK.class,
TransferExtensionPKValueEncoder.class);
}
public static void bind(ServiceBinder binder) {
}
@Contribute(SymbolProvider.class)
@ApplicationDefaults
public static void provideSymbols(
MappedConfiguration<String, String> configuration) {
configuration.add(SymbolConstants.SUPPORTED_LOCALES, "en, es");
configuration.add(UploadSymbols.REQUESTSIZE_MAX, "2048000");
configuration.add(UploadSymbols.FILESIZE_MAX, "2048000");
}
@Contribute(SymbolProvider.class)
@FactoryDefaults
public static void overrideFactorySymbols(
MappedConfiguration<String, Object> configuration) {
configuration.override(SymbolConstants.APPLICATION_VERSION,
"0.0.1-SNAPSHOT");
}
@Contribute(BeanBlockSource.class)
public static void addCustomBlocks(
Configuration<BeanBlockContribution> configuration) {
configuration.add(new DisplayBlockContribution("boolean",
"blocks/DisplayBlocks", "check"));
configuration.add(new DisplayBlockContribution(
"single-valued-association", "blocks/DisplayBlocks",
"showPageLink"));
configuration.add(new DisplayBlockContribution(
"many-valued-association", "blocks/DisplayBlocks",
"showPageLinks"));
}
@Contribute(HibernateEntityPackageManager.class)
public static void addPackagesToScan(Configuration<String> configuration) {
}
@Contribute(BuilderDirector.class)
public static void addBuilders(
MappedConfiguration<Class<?>, Builder<?>> configuration) {
}
}
回答1:
Tapestry will need a ValueEncoder for all primary key types so that it can convert from clientside string to servierside object. There are built in ValueEncoders for String and Long etc so this is usually not an issue. I'm guessing you'll need to contribute a ValueEncoderFactory to the ValueEncoderSource for TransferExtensionPK.
eg:
public class TransferExtensionPKValueEncoder implements ValueEncoderFactory<TransferExtensionPK>, ValueEncoder<TransferExtensionPK> {
public ValueEncoder<TransferExtensionPK> create(Class<TransferExtensionPK> type) {
return this;
}
public String toClient(TransferExtensionPK value) {
return value.getScriptCode() + ":" + getTransferType();
}
public TransferExtensionPK toValue(String clientValue) {
String[] values = clientValue.split(":");
return new TransferExtensionPK(values[0], values[1]);
}
}
public class MyModule {
public static void contributeValueEncoderSource(MappedConfiguration<Class, ValueEncoderFactory> config) {
config.addInstance(TransferExtensionPK.class, TransferExtensionPKValueEncoder.class);
}
}
Please report back if this fixes the problem as tapestry-hibernate should ideally give a nicer exception message.
Hibernate sucks for composite primary keys... I usually avoid them all together and all my tables have a sequence generated long as a primary key. It makes things much easier.
回答2:
Seems like built-in ValueEncoder is not quite up-to-task for this composite primary key entity. You can easily override the ValueEncoder for the whole entity
eg:
public class TransferExtensionValueEncoder implements ValueEncoderFactory<TransferExtension>, ValueEncoder<TransferExtension> {
@Inject Session hibernateSession;
public ValueEncoder<TransferExtension> create(Class<TransferExtension> type) {
return this;
}
public String toClient(TransferExtension value) {
return value.getScriptCode() + ":" + getTransferType();
}
public TransferExtension toValue(String clientValue) {
String[] values = clientValue.split(":");
Query query = hibernateSession
.createQuery("from TransferExtension where scriptCode = :scriptCode and transferType = :transferType")
.setParameter("scriptCode", values[0])
.setParameter("transferType", values[1]);
return (TransferExtension) query.uniqueResult();
}
}
public class MyModule {
public static void contributeValueEncoderSource(MappedConfiguration<Class, ValueEncoderFactory> config) {
// use overrideInstance to override the default HibernateEntityValueEncoder just for this one entity
config.overrideInstance(TransferExtension.class, TransferExtensionValueEncoder.class);
}
}
来源：https://stackoverflow.com/questions/28053574/hibernateentityvalueencoder-nullpointerexception