[英]Spring - autowired fields are null
我遇到了Spring Framework的問題: @Autowired
為null,但是Spring不會引發任何異常,而且我不明白,為什么這些字段為null。
我有一堂課:
package com.processing.gates;
public class Main {
private final ApplicationContext context = Context.getContext();
@Autowired private PaymentGateFactory paymentGateFactory;
@Autowired private CalculatorChooser calculatorChooser;
//...
}
例如,我有以下課程:
package com.processing.gates.comission;
@Component
public class CalculatorChooser {
//...
}
這是我的Spring配置xml:
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc.xsd">
<context:annotation-config />
<context:component-scan base-package="com.processing.gates"/>
<bean id="logPath" class="java.lang.String"> <!-- путь к папке с логами -->
<constructor-arg value="/home/yoba/NetBeansProjects/processing/gates/log/"/>
</bean>
<!-- ... -->
</beans>
當我嘗試用xml編寫時:
<bean id="calculator" class="com.processing.gates.comission.CalculatorChooser"/>
並從代碼中獲取它:
CalculatorChooser cc = (CalculatorChooser)Context.getContext().getBean("calculator");
它工作正常。 但是@Autowired不起作用。 我怎樣才能解決這個問題? 謝謝!
讓Spring通過在應用程序上下文文件中聲明Main
bean或使用@Component
批注來管理bean,就像您對CalculatorChooser
所做的那樣
<bean id="mainBean" class="com.processing.gates.Main"/>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.