我需要执行3个不同的查询并将结果合并发送并进行处理，最后将结果写入平面文件。
我已提到链接CompositeReader Example
以同样的方式实现了我的复合阅读器。
My Composite Reader课程。
public class FI008CreationCompositeReader
implements ItemStreamReader<List<T>>, ItemReadListener<List<T>> {
/** Registered ItemStreamReaders. */
private List<AbstractCursorItemReader<?>> cursorItemReaders;
@Value("#{jobParameters}")
private Map<String, JobParameter> jobParameters;
@Autowired
private DaoHelper daoHelper;
@Override
public List<T> read()
throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException {
// read from all registered readers
final List<T> items = new ArrayList<>();
int recCount = 0;
for (final AbstractCursorItemReader<?> cursorItemReader : this.cursorItemReaders) {
T t = new T();
while (null != t) {
t = (T) cursorItemReader.read();
items.add(t);
recCount++;
}
}
final JobParameter jobParameter = new JobParameter(Integer.toString(recCount));
this.jobParameters.put(BatchConstants.TOT_REC_CNT, jobParameter);
return items;
}
@Override
public void open(final ExecutionContext executionContext) throws ItemStreamException {
for (final ItemStream itemStream : this.cursorItemReaders) {
itemStream.open(executionContext);
}
}
@Override
public void update(final ExecutionContext executionContext) throws ItemStreamException {
for (final ItemStream itemStream : this.cursorItemReaders) {
itemStream.update(executionContext);
}
}
@Override
public void close() throws ItemStreamException {
for (final ItemStream itemStream : this.cursorItemReaders) {
itemStream.close();
}
}
public void setCursorItemReaders(final List<AbstractCursorItemReader<?>> cursorItemReaders) {
this.cursorItemReaders = cursorItemReaders;
}
@Override
public void beforeRead() {
}
@Override
public void afterRead(final List<Fi008ActvityTxnDtlsVO> item) {
}
@Override
public void onReadError(final Exception ex) {
final JobParameter eventIdParam = this.jobParameters.get(BatchConstants.EVENT_ID);
final String eventId = (String) eventIdParam.getValue();
// log error and update the event table
this.daoHelper.updateActionEvent(eventId, BatchConstants.FAILURE,
"Failed to read the records from DB for Fi008 processing.");
}
}
以下是我的XML配置
<bean id="fi008CreationCompositeReader" class="com.ent.giftcards.batch.readers.FI008CreationCompositeReader" scope="step">
<property name="cursorItemReaders">
<list>
<ref bean="promoTxnReader" />
<ref bean="overallTxnReader" />
<ref bean="promoTxnReader" />
</list>
</property>
</bean>
当我运行我的代码时，我得到了堆栈跟踪
[StepExecution: id=1, version=2, name=fi08step1, status=FAILED, exitStatus=FAILED, readCount=0, filterCount=0, writeCount=0 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=0, rollbackCount=0, exitDescription=org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scopedTarget.fi008CreationCompositeReader' defined in class path resource [applicationContext.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'cursorItemReaders'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'com.sun.proxy.$Proxy39 implementing org.springframework.beans.factory.InitializingBean,org.springframework.batch.item.ItemStreamReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised,org.springframework.core.DecoratingProxy' to required type 'org.springframework.batch.item.database.AbstractCursorItemReader' for property 'cursorItemReaders[0]': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$2.getObject(AbstractBeanFactory.java:345)
at org.springframework.batch.core.scope.StepScope.get(StepScope.java:113)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:340)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.aop.target.SimpleBeanTargetSource.getTarget(SimpleBeanTargetSource.java:35)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:192)
at com.sun.proxy.$Proxy31.open(Unknown Source)
at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96)
at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:310)
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:197)
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148)
at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:64)
at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67)
at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169)
at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144)
at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:134)
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:306)
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128)
at com.ent.giftcards.batch.SvcmpFI008Batch.runJob(SvcmpFI008Batch.java:58)
at com.ent.giftcards.main.SvcmpFI008BatchApp.main(SvcmpFI008BatchApp.java:37)
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'cursorItemReaders'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'com.sun.proxy.$Proxy39 implementing org.springframework.beans.factory.InitializingBean,org.springframework.batch.item.ItemStreamReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised,org.springframework.core.DecoratingProxy' to required type 'org.springframework.batch.item.database.AbstractCursorItemReader' for property 'cursorItemReaders[0]': no matching editors or conversion strategy found
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:605)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:617)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:216)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1577)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1536)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1276)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
... 23 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'com.sun.proxy.$Proxy39 implementing org.springframework.beans.factory.InitializingBean,org.springframework.batch.item.ItemStreamReader,org.springframework.batch.item.ItemStream,org.springframework.aop.scope.ScopedObject,java.io.Serializable,org.springframework.aop.framework.AopInfrastructureBean,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised,org.springframework.core.DecoratingProxy' to required type 'org.springframework.batch.item.database.AbstractCursorItemReader' for property 'cursorItemReaders[0]': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:306)
at org.springframework.beans.TypeConverterDelegate.convertToTypedCollection(TypeConverterDelegate.java:574)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:220)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:590)
... 29 more
]
有没有人知道这里出了什么问题。
更新
我已经尝试将列表更改为列表，但现在我正处于异常之下。
[StepExecution: id=1, version=2, name=fi08step1, status=FAILED, exitStatus=FAILED, readCount=0, filterCount=0, writeCount=0 readSkipCount=0, writeSkipCount=0, processSkipCount=0, commitCount=0, rollbackCount=0, exitDescription=org.springframework.batch.item.ItemStreamException: Failed to initialize the reader
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:147)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy39.open(Unknown Source)
at com.ent.giftcards.batch.readers.FI008CreationCompositeReader.open(FI008CreationCompositeReader.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy31.open(Unknown Source)
at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:96)
at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:310)
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:197)
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148)
at org.springframework.batch.core.job.flow.JobFlowExecutor.executeStep(JobFlowExecutor.java:64)
at org.springframework.batch.core.job.flow.support.state.StepState.handle(StepState.java:67)
at org.springframework.batch.core.job.flow.support.SimpleFlow.resume(SimpleFlow.java:169)
at org.springframework.batch.core.job.flow.support.SimpleFlow.start(SimpleFlow.java:144)
at org.springframework.batch.core.job.flow.FlowJob.doExecute(FlowJob.java:134)
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:306)
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:135)
at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:128)
at com.ent.giftcards.batch.SvcmpFI008Batch.runJob(SvcmpFI008Batch.java:58)
at com.ent.giftcards.main.SvcmpFI008BatchApp.main(SvcmpFI008BatchApp.java:37)
Caused by: java.lang.IllegalStateException: Stream is already initialized. Close before re-opening.
at org.springframework.util.Assert.state(Assert.java:70)
at org.springframework.batch.item.database.AbstractCursorItemReader.doOpen(AbstractCursorItemReader.java:402)
at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:144)
... 40 more
]