我有一个查询批量获取正在对两个表执行的查询。这些是他们之间的关系。
//CATEGORY_ON_PAGE
@Entity
@Cacheable(true)
@Table(name="CATEGORY_ON_PAGE")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler", "fieldHandler"})
@EntityListeners({JPAtoEOFChangeNotifier.class, JPAObjectChangeSubscriber.class})
@Was(com.stratahealth.shared.model.CategoryOnPage.class)
public class CategoryOnFormJPAImpl implements CategoryOnForm {
@NotNull @ManyToOne(targetEntity=CategoryJPAImpl.class, fetch=FetchType.LAZY) @JoinColumn(name="CATEGORY_ID")
@org.eclipse.persistence.annotations.BatchFetch(value=org.eclipse.persistence.annotations.BatchFetchType.JOIN,size=990)
private Category category;
}
//CATEGORY ENTITY
@Entity
@Cacheable(true)
@Table(name="CATEGORY")
@EntityListeners({JPAtoEOFChangeNotifier.class, JPAObjectChangeSubscriber.class})
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler", "fieldHandler"})
@JsonIdentityInfo(generator=ObjectIdGenerators.PropertyGenerator.class, property="id")
@Was(com.stratahealth.shared.model.Category.class)
public class CategoryJPAImpl implements Category {
@OneToMany(targetEntity=CategoryOnFormJPAImpl.class, mappedBy="category")
private Set<CategoryOnForm> categoryForms;
关系在表格上的类别中。当BatchFetch检索页面的类别时，将抛出空指针。这是堆栈跟踪。
javax.el.ELException: //usr/local/jsp/loader_194859196/META-INF/resources/informationProfile.xhtml @28,59 listener="#{editInformationProfileController.init()}": java.lang.NullPointerException
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:111)
at com.sun.faces.facelets.tag.jsf.core.DeclarativeSystemEventListener.processEvent(EventHandler.java:128)
at javax.faces.component.UIComponent$ComponentSystemEventListenerAdapter.processEvent(UIComponent.java:2486)
at javax.faces.event.SystemEvent.processListener(SystemEvent.java:106)
at com.sun.faces.application.ApplicationImpl.processListeners(ApplicationImpl.java:2163)
at com.sun.faces.application.ApplicationImpl.invokeComponentListenersFor(ApplicationImpl.java:2111)
at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:289)
at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:247)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:107)
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.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:100)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.stratahealth.shared.common.filters.MainFilter.doFilter(MainFilter.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.clickspace.csutilities.jsf.UTF8CharacterEncodingFilter.doFilter(UTF8CharacterEncodingFilter.java:15)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at com.stratahealth.shared.common.filters.RequireLoginFilter.doFilter(RequireLoginFilter.java:63)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
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:662)
Caused by: java.lang.NullPointerException
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:431)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1168)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:899)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1127)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:403)
at org.eclipse.persistence.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:3214)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1786)
at org.eclipse.persistence.mappings.OneToOneMapping.executeBatchQuery(OneToOneMapping.java:806)
at org.eclipse.persistence.mappings.ForeignReferenceMapping.extractResultFromBatchQuery(ForeignReferenceMapping.java:643)
at org.eclipse.persistence.internal.indirection.BatchValueHolder.instantiate(BatchValueHolder.java:58)
at org.eclipse.persistence.internal.indirection.QueryBasedValueHolder.instantiate(QueryBasedValueHolder.java:116)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:89)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiateImpl(UnitOfWorkValueHolder.java:173)
at org.eclipse.persistence.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:234)
at org.eclipse.persistence.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:89)
at com.stratahealth.shared.model.restimpl.jpa.CategoryOnFormJPAImpl._persistence_get_category(CategoryOnFormJPAImpl.java)
at com.stratahealth.shared.model.restimpl.jpa.CategoryOnFormJPAImpl.getCategory(CategoryOnFormJPAImpl.java:60)
at com.stratahealth.shared.common.services.impl.CategoryServiceImpl.sortedCategoriesForFormWithCareTypes(CategoryServiceImpl.java:104)
at com.stratahealth.shared.common.controllers.EditInformationProfileController.getCategoriesOnFormForCareType(EditInformationProfileController.java:1421)
at com.stratahealth.shared.common.controllers.EditInformationProfileController.init(EditInformationProfileController.java:442)
at sun.reflect.GeneratedMethodAccessor1206.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:528)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257)
at com.sun.el.parser.AstValue.invoke(AstValue.java:248)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
... 49 more
在ReadAllQuery.executeObjectLevelReadQuery方法中，抛出空指针。这是因为“TranslationRow”被渲染为null。但这并不一致，我只能通过运气重现这一点。
NPE所在的行：
Object sopObject = getTranslationRow().getSopObject();
调用getTranslationRow（）时，返回null值并抛出异常。这是NPE在Eclipse Link库中发生的方法。
/**
* INTERNAL:
* Execute the query.
* Get the rows and build the object from the rows.
* @exception DatabaseException - an error has occurred on the database
* @return java.lang.Object collection of objects resulting from execution of query.
*/
@Override
protected Object executeObjectLevelReadQuery() throws DatabaseException {
Object result = null;
if (this.containerPolicy.overridesRead()) {
this.executionTime = System.currentTimeMillis();
return this.containerPolicy.execute();
}
if (this.descriptor.isDescriptorForInterface()) {
Object returnValue = this.descriptor.getInterfacePolicy().selectAllObjectsUsingMultipleTableSubclassRead(this);
this.executionTime = System.currentTimeMillis();
return returnValue;
}
if (this.descriptor.hasTablePerClassPolicy() && this.descriptor.isAbstract()) {
result = this.containerPolicy.containerInstance();
} else {
Object sopObject = getTranslationRow().getSopObject();
boolean useOptimization = false;
if (sopObject == null) {
useOptimization = usesResultSetAccessOptimization();
}
if (useOptimization) {
DatabaseCall call = ((DatasourceCallQueryMechanism)this.queryMechanism).selectResultSet();
this.executionTime = System.currentTimeMillis();
Statement statement = call.getStatement();
ResultSet resultSet = call.getResult();
DatabaseAccessor dbAccessor = (DatabaseAccessor)getAccessor();
boolean exceptionOccured = false;
try {
if (this.session.isUnitOfWork()) {
result = registerResultSetInUnitOfWork(resultSet, call.getFields(), call.getFieldsArray(), (UnitOfWorkImpl)this.session, this.translationRow);
} else {
result = this.containerPolicy.containerInstance();
this.descriptor.getObjectBuilder().buildObjectsFromResultSetInto(this, resultSet, call.getFields(), call.getFieldsArray(), result);
}
} catch (SQLException exception) {
exceptionOccured = true;
DatabaseException commException = dbAccessor.processExceptionForCommError(this.session, exception, call);
if (commException != null) {
throw commException;
}
throw DatabaseException.sqlException(exception, call, dbAccessor, this.session, false);
} finally {
try {
if (resultSet != null) {
resultSet.close();
}
if (dbAccessor != null) {
if (statement != null) {
dbAccessor.releaseStatement(statement, call.getSQLString(), call, this.session);
}
}
if (call.hasAllocatedConnection()) {
getExecutionSession().releaseConnectionAfterCall(this);
}
} catch (RuntimeException cleanupException) {
if (!exceptionOccured) {
throw cleanupException;
}
} catch (SQLException cleanupSQLException) {
if (!exceptionOccured) {
throw DatabaseException.sqlException(cleanupSQLException, call, dbAccessor, this.session, false);
}
}
}
} else {
List<AbstractRecord> rows;
if (sopObject != null) {
Object valuesIterator = this.containerPolicy.iteratorFor(getTranslationRow().getSopObject());
int size = this.containerPolicy.sizeFor(sopObject);
rows = new ArrayList<AbstractRecord>(size);
while (this.containerPolicy.hasNext(valuesIterator)) {
Object memberSopObject = this.containerPolicy.next(valuesIterator, this.session);
DatabaseRecord memberRow = new DatabaseRecord(0);
memberRow.setSopObject(memberSopObject);
rows.add(memberRow);
}
this.executionTime = System.currentTimeMillis();
} else {
rows = getQueryMechanism().selectAllRows();
this.executionTime = System.currentTimeMillis();
// If using 1-m joins, must set all rows.
if (hasJoining() && this.joinedAttributeManager.isToManyJoin()) {
this.joinedAttributeManager.setDataResults(rows, this.session);
}
// Batch fetching in IN requires access to the rows to build the id array.
if ((this.batchFetchPolicy != null) && this.batchFetchPolicy.isIN()) {
this.batchFetchPolicy.setDataResults(rows);
}
}
if (this.session.isUnitOfWork()) {
result = registerResultInUnitOfWork(rows, (UnitOfWorkImpl)this.session, this.translationRow, true);//
} else {
if (rows instanceof ThreadCursoredList) {
result = this.containerPolicy.containerInstance();
} else {
result = this.containerPolicy.containerInstance(rows.size());
}
this.descriptor.getObjectBuilder().buildObjectsInto(this, rows, result);
}
if (sopObject != null) {
if (!this.descriptor.getObjectBuilder().isSimple()) {
// remove sopObject so it's not stuck in any value holder.
for (AbstractRecord row : rows) {
row.setSopObject(null);
}
}
} else {
if (this.shouldIncludeData) {
ComplexQueryResult complexResult = new ComplexQueryResult();
complexResult.setResult(result);
complexResult.setData(rows);
result = complexResult;
}
}
}
}
// Add the other (already registered) results and return them.
if (this.descriptor.hasTablePerClassPolicy()) {
result = this.containerPolicy.concatenateContainers(
result, this.descriptor.getTablePerClassPolicy().selectAllObjectsUsingMultipleTableSubclassRead(this), this.session);
}
// If the results were empty, then ensure they get cached still.
if (shouldCacheQueryResults() && this.containerPolicy.isEmpty(result)) {
this.temporaryCachedQueryResults = InvalidObject.instance();
}
return result;
}
从我对eclipse链接的非常有限的理解。我相信翻译行是批量提取查询检索的行。有没有人有任何想法为什么这被渲染为null .....任何帮助将不胜感激。