I am developing Spring Batch - MongoDB to XML example. In this example, when I run the main method I see the below error is cominng. Please guide on the below error. I tried to find the solution on the web, but I dont find anything helpful on the web yet.
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'step1': Cannot resolve reference to bean 'mongodbItemReader' while setting bean property 'itemReader'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongodbItemReader' defined in class path resource [job-report.xml]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: A type to convert the input into is required.
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:1492)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1237)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:552)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
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:740)
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:93)
at com.mkyong.App.main(App.java:15)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongodbItemReader' defined in class path resource [job-report.xml]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: A type to convert the input into is required.
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1589)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:554)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
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: java.lang.IllegalStateException: A type to convert the input into is required.
at org.springframework.util.Assert.state(Assert.java:392)
at org.springframework.batch.item.data.MongoItemReader.afterPropertiesSet(MongoItemReader.java:200)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1648)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1585)
... 22 more
database.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mongo="http://www.springframework.org/schema/data/mongo"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/data/mongo
http://www.springframework.org/schema/data/mongo/spring-mongo.xsd">
<!-- connect to mongodb -->
<mongo:mongo host="127.0.0.1" port="27017" />
<mongo:db-factory dbname="yourdb" />
<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
</bean>
</beans>
context.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="transactionManager" class="org.springframework.batch.support.transaction.ResourcelessTransactionManager"/>
<!-- stored job-meta in memory -->
<bean id="jobRepository" class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean">
<property name="transactionManager" ref="transactionManager" />
</bean>
<bean id="jobLauncher" class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<property name="jobRepository" ref="jobRepository" />
</bean>
</beans>
job-report.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch" xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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.xsd">
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="mongodbItemReader" writer="xmlItemWriter" commit-interval="1">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="mongodbItemReader" class="org.springframework.batch.item.data.MongoItemReader">
<property name="template" ref="mongoTemplate" />
<property name="collection" value="report" />
</bean>
<bean id="xmlItemWriter" class="org.springframework.batch.item.xml.StaxEventItemWriter">
<property name="resource" value="classpath:xml/report.xml" />
<property name="marshaller" ref="reportMarshaller" />
<property name="rootTagName" value="record" />
</bean>
<!-- ==== Solution-1 ==== -->
<bean id="reportMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
<property name="classesToBeBound">
<value>com.mkyong.Report</value>
</property>
</bean>
<!-- ==== Solution-2 ==== -->
<!-- <bean id="reportMarshaller" class="org.springframework.oxm.xstream.XStreamMarshaller">
<property name="aliases">
<util:map id="aliases">
<entry key="record" value="com.mkyong.Report" />
</util:map>
</property>
<property name="converters">
<array>
<ref bean="reportConverter" />
</array>
</property>
</bean> -->
<bean id="reportConverter" class="com.mkyong.ReportConverter" />
</beans>
Repoer.java
@XmlRootElement(name = "record")
public class Report {
private int id;
private Date date;
private long impression;
private int clicks;
private BigDecimal earning;
@XmlAttribute(name = "id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@XmlElement(name = "date")
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
@XmlElement(name = "impression")
public long getImpression() {
return impression;
}
public void setImpression(long impression) {
this.impression = impression;
}
@XmlElement(name = "clicks")
public int getClicks() {
return clicks;
}
public void setClicks(int clicks) {
this.clicks = clicks;
}
@XmlElement(name = "earning")
public BigDecimal getEarning() {
return earning;
}
public void setEarning(BigDecimal earning) {
this.earning = earning;
}
}
App.java
public class App {
public static void main(String[] args) {
String[] springConfig = { "database.xml", "context.xml", "job-report.xml" };
ApplicationContext context = new ClassPathXmlApplicationContext(springConfig);
JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");
Job job = (Job) context.getBean("reportJob");
try {
JobExecution execution = jobLauncher.run(job, new JobParameters());
System.out.println("Exit Status : " + execution.getStatus());
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Done");
}
}
Could you help on this?
As the error points out, you need to set the "type" property on your "mongodbItemReader" bean.
See MongoItemReader javadoc.
Example:
<bean id="mongodbItemReader" class="org.springframework.batch.item.data.MongoItemReader">
<property name="template" ref="mongoTemplate" />
<property name="collection" value="report" />
<property name="targetType" value="Report.class" />
</bean>
You might need to specify the package name in the value (I haven't tried it).
Thank you @Sergio, it was great help from you, but below configuration works.
<bean id="mongodbItemReader" class="org.springframework.batch.item.data.MongoItemReader">
<property name="template" ref="mongoTemplate" />
<property name="collection" value="report" />
<property name="targetType" value="com.mkyong.model.Report" />
<property name="query" value="{'_id':{$gt:0} }" />
<property name="sort">
<util:map>
<entry key="id" value="#{T(org.springframework.data.domain.Sort.Direction).ASC}" />
</util:map>
</property>
</bean>
The only problem I see, nothing is getting write into the XML file. I will raise a separate question for this issue.
Note: The main reason of this error is you need to set <property name="targetType" value="com.mkyong.model.Report" /> this property correctly.
You can also refer: http://www.mkyong.com/spring-batch/how-to-convert-date-in-beanwrapperfieldsetmapper/ as another solution.
来源：https://stackoverflow.com/questions/41503096/spring-batch-mongodb-to-xml-caused-by-java-lang-illegalstateexception-a-ty