spring - 使用 spring batch 和 spring boot 2.2.5 时无法从 xml 配置中注册 Custom LineMapper

Question

版本使用:

Spring Boot 2.2.5

Spring 批核 4.x

spring-batch.xml 文件中只有一个如下 bean:

<bean id="lineMapper" primary="true" class="com.batch.ContextSavingLineMapper" scope="step">
        <property name="lineTokenizer">
            <bean class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
                <!-- This is to accept lines with incorrect number of tokens -->
                <property name="strict" value="false"/>
                <!-- Expected CSV column names -->
                <property name="names" value="#{jobParameters['columnNames']}" />
            </bean>
        </property>
        <property name="fieldSetMapper">
            <bean class="com.batch.DetectorRegistrationFieldSetMapper" />
        </property>
    </bean>

类 ContextSavingLineMapper 扩展如下:

public class ContextSavingLineMapper<T> extends DefaultLineMapper<T> implements StepExecutionListener {

消息错误:

Description:

The bean 'lineMapper', defined in BeanDefinition defined in class path resource [spring-batch.xml], could not be registered. A bean with that name has already been defined in class path resource [spring-batch.xml] and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

注意:我不想使用 spring.main.allow-bean-definition-overriding=true .

Answer 1

您遇到了这个 Unresolved 问题:https://github.com/spring-projects/spring-batch/issues/1050 .

I don't want to use spring.main.allow-bean-definition-overriding=true

不幸的是，在上述问题得到解决之前，这是唯一的解决方法。