Minor typo :-), should be ultimateAnswer
in your xml, not ultimateanswer
ConstructorProperties annotation does not work
-
03-07-2023 - |
Frage
I'm trying to get a bean instance using Constructor-based dependency injection. But it keeps throwing org.springframework.beans.factory.UnsatisfiedDependencyException.
Error message: Error creating bean with name 'bean1' defined in class path resource [bean.xml]: Unsatisfied dependency expressed through constructor argument with index 1 of type [java.lang.String]: Ambiguous constructor argument types - did you specify the correct bean references as constructor arguments?
Following is my simple code:
Bean1.java
package com.example.bean
import java.beans.ConstructorProperties;
public class Bean1 {
private int years;
private String ultimateAnswer;
@ConstructorProperties({"years", "ultimateAnswer"})
public Bean1(int years, String ultimateAnswer) {
this.years = years;
this.ultimateAnswer = ultimateAnswer;
}
public int getYears() {
return years;
}
public void setYears(int years) {
this.years = years;
}
public String getUltimateAnswer() {
return ultimateAnswer;
}
public void setUltimateAnswer(String ultimateAnswer) {
this.ultimateAnswer = ultimateAnswer;
}
public void print() {
System.out.println("years:" + years + ", ultimateAnswer:" + ultimateAnswer);
}
}
TestApp.java
package com.example.app;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.example.bean.Bean1;
public class TestApp {
@SuppressWarnings("resource")
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"bean.xml"});
Bean1 bean1 = context.getBean("bean1",Bean1.class);
bean1.print();
}
}
bean.xml
<?xml version="1.0" encoding="UTF-8"?>
<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="bean1" class="com.example.bean.Bean1">
<constructor-arg name="years" value="7500000"/>
<constructor-arg name="ultimateanswer" value="42"/>
</bean>
</beans>
Could anybody help to figure it out what's the problem? Thanks in advance!
Lösung
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