我正在开发Spring Batch示例。在此示例中，我希望开发compositeJdbcReader和compositeJdbcWritter API以将数据库表数据转换为单个XML文件。在尝试这样做时，我面临以下错误：
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'compositeJdbcReaderStep': Cannot resolve reference to bean 'compositeItemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'compositeItemReader' defined in class path resource [composite/xml-jdbc-composite-item-reader-job.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 [org.springframework.batch.core.job.flow.FlowJob] 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.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:359)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1481)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:753)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.common.batch.main.CompositeXMLMain.main(CompositeXMLMain.java:17)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'compositeItemReader' defined in class path resource [composite/xml-jdbc-composite-item-reader-job.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 [org.springframework.batch.core.job.flow.FlowJob] 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:553)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351)
... 15 more
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 [org.springframework.batch.core.job.flow.FlowJob] 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:591)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertForProperty(AbstractNestablePropertyAccessor.java:603)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:204)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1527)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1486)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
... 21 more
Caused by: java.lang.IllegalStateException: Cannot convert value of type [org.springframework.batch.core.job.flow.FlowJob] 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:302)
at org.springframework.beans.TypeConverterDelegate.convertToTypedCollection(TypeConverterDelegate.java:570)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:216)
at org.springframework.beans.AbstractNestablePropertyAccessor.convertIfNecessary(AbstractNestablePropertyAccessor.java:576)
... 27 more
不确定这里出了什么问题。请指导
XML的JDBC复合项阅读器-job.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd">
<import resource="classpath:context-datasource.xml" />
<!-- JobRepository and JobLauncher are configuration/setup classes -->
<bean id="jobRepository" class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean" />
<bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<property name="jobRepository" ref="jobRepository" />
</bean>
<!-- Step will need a transaction manager -->
<bean id="transactionManager"
class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" />
<!-- =========================================================== -->
<job id="compositeJdbcReaderJob" xmlns="http://www.springframework.org/schema/batch">
<step id="compositeJdbcReaderStep" next="compositeJdbcReaderStep2">
<tasklet>
<chunk reader="compositeItemReader" writer="itemWriter" commit-interval="5" />
</tasklet>
</step>
<step id="compositeJdbcReaderStep2">
<tasklet>
<chunk reader="compositeItemReader2" writer="itemWriter2" commit-interval="5" />
</tasklet>
</step>
</job>
<!-- ============= Composite Item Reader ================ -->
<bean id="compositeItemReader" class="com.common.batch.reader.CompositeCursorItemReader">
<property name="unifyingMapper">
<bean class="com.common.batch.mapper.DefaultUnifyingStringItemsMapper" />
</property>
<property name="cursorItemReaders">
<list>
<ref bean="itemReader1" />
</list>
</property>
</bean>
<bean id="compositeItemReader2" class="com.common.batch.reader.CompositeCursorItemReader">
<property name="unifyingMapper">
<bean class="com.common.batch.mapper.DefaultUnifyingStringItemsMapper" />
</property>
<property name="cursorItemReaders">
<list>
<ref bean="itemReader2" />
</list>
</property>
</bean>
<!-- ========== ItemReader =============== -->
<bean id="itemReader1" class="org.springframework.batch.item.database.JdbcCursorItemReader">
<property name="dataSource" ref="dataSource" />
<property name="saveState" value="true" />
<property name="sql">
<value>
<![CDATA[ ${select.sql.customers} ]]>
</value>
</property>
<property name="rowMapper">
<bean class="com.common.batch.mapper.CustomerMapper" />
</property>
</bean>
<bean id="itemReader2" class="org.springframework.batch.item.database.JdbcCursorItemReader">
<property name="dataSource" ref="dataSource" />
<property name="saveState" value="true" />
<property name="sql">
<value>
<![CDATA[ ${select.sql.employees} ]]>
</value>
</property>
<property name="rowMapper">
<bean class="com.common.batch.mapper.EmployeeMapper" />
</property>
</bean>
<!-- ItemWritter -->
<bean id="itemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="file:xml/customers.xml" />
<property name="marshaller" ref="customerUnmarshaller" />
<property name="rootTagName" value="customers" />
</bean>
<!-- ======= Customer Unmarshaller ======== -->
<bean id="customerUnmarshaller" class="org.springframework.oxm.xstream.XStreamMarshaller">
<property name="aliases">
<util:map id="aliases">
<entry key="customer" value="com.common.batch.model.Customer" />
</util:map>
</property>
</bean>
<bean id="itemWriter2" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="file:xml/customers.xml" />
<property name="marshaller" ref="employeeUnmarshaller" />
<property name="rootTagName" value="employees" />
</bean>
<!-- ======= Employee Unmarshaller ======== -->
<bean id="employeeUnmarshaller" class="org.springframework.oxm.xstream.XStreamMarshaller">
<property name="aliases">
<util:map id="aliases">
<entry key="employee" value="com.common.batch.model.Employee" />
</util:map>
</property>
</bean>
<bean id="itemCustomerProcessor" class="com.common.batch.processor.CustomerProcessor" />
<bean id="itemEmployeeProcessor" class="com.common.batch.processor.EmployeeProcessor" />
<job id="itemReader1" xmlns="http://www.springframework.org/schema/batch">
<step id="step1">
<tasklet transaction-manager="transactionManager">
<chunk reader="compositeItemReader" writer="itemWriter" processor="itemCustomerProcessor" commit-interval="1" />
</tasklet>
</step>
</job>
<job id="itemReader2" xmlns="http://www.springframework.org/schema/batch">
<step id="step2">
<tasklet transaction-manager="transactionManager">
<chunk reader="compositeItemReader2" writer="itemWriter2" processor="itemEmployeeProcessor" commit-interval="1" />
</tasklet>
</step>
</job>
</beans>
CompositeXMLMain.java
public class CompositeXMLMain {
@SuppressWarnings("resource")
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("composite/xml-jdbc-composite-item-reader-job.xml");
JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");
Job job = (Job) context.getBean("compositeJdbcReaderJob");
JobExecution execution;
try {
execution = jobLauncher.run(job, new JobParameters());
System.out.println("Job Exit Status : "+ execution.getStatus());
} catch (JobExecutionAlreadyRunningException | JobRestartException
| JobInstanceAlreadyCompleteException | JobParametersInvalidException e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
System.out.println("Done !!");
}
}
答案 0 :(得分：0)
我能够通过删除以下标记来解决问题：
<job id="itemReader1" xmlns="http://www.springframework.org/schema/batch">
<step id="step1">
<tasklet transaction-manager="transactionManager">
<chunk reader="compositeItemReader" writer="itemWriter" processor="itemCustomerProcessor" commit-interval="1" />
</tasklet>
</step>
</job>
<job id="itemReader2" xmlns="http://www.springframework.org/schema/batch">
<step id="step2">
<tasklet transaction-manager="transactionManager">
<chunk reader="compositeItemReader2" writer="itemWriter2" processor="itemEmployeeProcessor" commit-interval="1" />
</tasklet>
</step>
</job>