我正在尝试使用JSR-352 API和Spring Batch 3.0.4作为实现来实现示例批处理应用程序。
在创建名为'batchPropertyPostProcessor'的bean的错误的初始化阶段,批处理作业执行失败:
Exception in thread "main" javax.batch.operations.JobStartException: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'batchPropertyPostProcessor': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void org.springframework.batch.core.jsr.launch.support.BatchPropertyBeanPostProcessor.setBatchPropertyContext(org.springframework.batch.core.jsr.configuration.support.BatchPropertyContext); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [dataListingStepListener] for bean with name 'scopedTarget.dataListingStepListener' defined in null; nested exception is java.lang.ClassNotFoundException: dataListingStepListener
at org.springframework.batch.core.jsr.launch.JsrJobOperator.start(JsrJobOperator.java:637)
at x98.BatchRunner.main(BatchRunner.java:18)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'batchPropertyPostProcessor': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void org.springframework.batch.core.jsr.launch.support.BatchPropertyBeanPostProcessor.setBatchPropertyContext(org.springframework.batch.core.jsr.configuration.support.BatchPropertyContext); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [dataListingStepListener] for bean with name 'scopedTarget.dataListingStepListener' defined in null; nested exception is java.lang.ClassNotFoundException: dataListingStepListener
at org.springframework.batch.core.jsr.configuration.support.SpringAutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(SpringAutowiredAnnotationBeanPostProcessor.java:262)
at org.springframework.batch.core.jsr.configuration.support.JsrAutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(JsrAutowiredAnnotationBeanPostProcessor.java:30)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:232)
at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:618)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:467)
at org.springframework.batch.core.jsr.launch.JsrJobOperator.start(JsrJobOperator.java:635)
... 1 more
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire method: public void org.springframework.batch.core.jsr.launch.support.BatchPropertyBeanPostProcessor.setBatchPropertyContext(org.springframework.batch.core.jsr.configuration.support.BatchPropertyContext); nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [dataListingStepListener] for bean with name 'scopedTarget.dataListingStepListener' defined in null; nested exception is java.lang.ClassNotFoundException: dataListingStepListener
at org.springframework.batch.core.jsr.configuration.support.SpringAutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(SpringAutowiredAnnotationBeanPostProcessor.java:575)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
at org.springframework.batch.core.jsr.configuration.support.SpringAutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(SpringAutowiredAnnotationBeanPostProcessor.java:259)
... 13 more
Caused by: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [dataListingStepListener] for bean with name 'scopedTarget.dataListingStepListener' defined in null; nested exception is java.lang.ClassNotFoundException: dataListingStepListener
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1325)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:594)
at org.springframework.beans.factory.support.AbstractBeanFactory.isTypeMatch(AbstractBeanFactory.java:526)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:387)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:354)
at org.springframework.beans.factory.BeanFactoryUtils.beanNamesForTypeIncludingAncestors(BeanFactoryUtils.java:187)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1002)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:960)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:858)
at org.springframework.batch.core.jsr.configuration.support.SpringAutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(SpringAutowiredAnnotationBeanPostProcessor.java:532)
... 15 more
Caused by: java.lang.ClassNotFoundException: dataListingStepListener
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:247)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1346)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1317)
... 24 more
我的批处理员:
public class BatchRunner {
public static void main(String[] args) {
System.setProperty("JSR-352-BASE-CONTEXT", "x98_batch_local.xml");
Properties jobParameters = new Properties();
jobParameters.put("message", "Hello!");
JobOperator jobOperator = BatchRuntime.getJobOperator();
jobOperator.start("x98SampleJob", jobParameters);
}
}
我的sampleJob定义:
<?xml version="1.0" encoding="UTF-8"?>
<job id="x98SampleJob" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/jobXML_1_0.xsd"
version="1.0">
<step id="simple" next="dataListing">
<batchlet ref="simpleBatchlet">
<properties>
<property name="message" value="#{jobParameters['message']}" />
</properties>
</batchlet>
</step>
<step id="dataListing">
<listeners>
<listener ref="dataListingStepListener"/>
</listeners>
<chunk item-count="3">
<reader ref="dataListingItemReader" />
<processor ref="dataListingItemProcessor"/>
<writer ref="dataListingItemWriter"/>
</chunk>
</step>
</job>
我的读者,作家,处理器和监听器的Spring bean配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd">
<import resource="classpath*:x98_services.xml"/>
<bean name="simpleBatchlet" class="x98.batch.SimpleBatchlet"/>
<bean name="dataListingItemProcessor" class="x98.batch.DataListingItemProcessor"/>
<bean name="dataListingItemReader" class="x98.batch.DataListingItemReader">
<property name="tx98DatasService" ref="tx98DatasService"/>
<property name="tx98StructureService" ref="tx98StructureService"/>
</bean>
<bean name="dataListingItemWriter" class="x98.batch.DataListingItemWriter"/>
<bean name="dataListingStepListener" class="x98.batch.DataListingStepListener">
<property name="tx98StatusService" ref="tx98StatusService"/>
</bean>
</beans>
读取器,编写器和处理器由Spring实例化,并在作业运行中正确使用。当我将监听器添加到作业定义时,它停止工作。
我调试了代码,我看到在Spring上下文中初始化了dataListingStepListener bean。我不明白为什么对侦听器(<listener ref="dataListingStepListener"/>
)的引用不被识别为Spring bean而Spring正在尝试加载名为“dataListingStepListener”的类。
我的配置好吗?我做错了吗?
答案 0 :(得分:1)
在阅读了Gist之后,有几个笔记:
作业特定bean必须位于子上下文中
Spring Batch的JSR-352上下文管理通过父/子关系工作。父上下文由baseContext.xml定义,或者可以通过系统属性JSR-352-BASE-CONTEXT
覆盖。该上下文仅用于基础结构bean,并且不会由JSR-352后处理器处理,例如属性注入。你说“当我将监听器添加到工作定义时,它停止了工作。”如果您密切关注,当作业运行时,您的属性未被注入SimpleBatchlet
(消息为null
)。
原因是如果要运行多个作业,则不需要创建多个JobRepository
实例,多个连接池等,因此我们只引导父上下文一次。由于我们只引导一次,因此我们没有像当时注入的作业属性那样的值(并且它们可能会因作业而改变)。
因此,所有特定于作业的bean都应该在子上下文中。
为JSR-352定义子上下文
JSR-352提供了三种处理bean创建的方法:
ref
属性中提供完全限定的类名,并使用no-arg构造函数创建它。有了这个,我们就如何创建bean实例来控制你。默认情况下,在Spring中,bean是在启动时创建的单例。但是,Spring Batch提供范围(step
或job
)以允许后期绑定属性。如果要进行属性注入,则必须将bean定义为step
范围(SimpleBatchlet
不是第一次运行时消息为null
的原因。
那么在定义作业的上下文时,如何实现Spring DI和基于标准的JSR-352之间的关注点分离?简单。将作业XML导入Spring XML,并将Spring XML名称传递给要启动的JobOperator
。在你的情况下,而不是:
public static void main(String[] args) {
System.setProperty("JSR-352-BASE-CONTEXT", "x98_batch_local.xml");
Properties jobParameters = new Properties();
jobParameters.put("message", "Hello!");
JobOperator jobOperator = BatchRuntime.getJobOperator();
jobOperator.start("x98SampleJob", jobParameters);
}
将以下内容添加到x98_batch_local.xml:
<import resource="classpath*:x98SampleJob.xml"/>
然后通过以下方式执行您的工作:
public static void main(String[] args) {
Properties jobParameters = new Properties();
jobParameters.put("message", "Hello!");
JobOperator jobOperator = BatchRuntime.getJobOperator();
jobOperator.start("x98_batch_local.xml", jobParameters);
}
上述调整并将SimpleBatchlet
设置为步骤范围将导致您的作业按预期运行。
注意:由于这个问题,我创建了问题BATCH-2388,以便更好地记录上面讨论的上下文考虑因素。