Spring bean initialization with multiple-arg method

Question

I would like to create the following Spring bean (a JMX monitor) which has a method setThresholds(Number highThreshold,Number lowThreshold).

Could I invoke the method (with two arguments) in the configuration? I don't want to write codes to invoke it.

<bean id="myMonitor" class="javax.management.monitor.GaugeMonitor" init-method="start">
  <property name="observedObject">
    <bean class="javax.management.ObjectName">
      <constructor-arg value="test.jmx:name=testBean1" />
    </bean>
  </property>
  <property name="observedAttribute" value="testProperty" />
  <property name="granularityPeriod">
    <bean class="java.lang.Float">
      <constructor-arg value="1000" />
    </bean>
  </property>
</bean>

"I don't want to write codes to invoke it". Why not? Why do you want to do weird things in XML, instead of doing it Java, where it belongs? — skaffman
– skaffman, Commented Mar 18, 2011 at 8:41
@skaffman - For maintenance reason...I usually like to keep this kind of configuration details in XML. — Tommy Siu
– Tommy Siu, Commented Mar 18, 2011 at 9:18

Ralph · Accepted Answer · 2017-11-10 07:34:29Z

33

It is possible by using the MethodInvokingFactoryBean (Spring 4.x and 5.x) (It is not my idea, I just found it this forum: http://forum.springsource.org/archive/index.php/t-16354.html)

SomeClass someobject = new SomeClass();
someobject.set("String1","String2");

<bean id="someobject" class="SomeClass" />

<bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="someobject">
    <property name="targetMethod" value="set">
    <property name="arguments">
        <list>
            <value>String1</value>
            <value>String2</value>
        </list>
    </property>
</bean>

edited Nov 10, 2017 at 7:34

answered Mar 18, 2011 at 8:35

Ralph

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5 Comments

byeo Over a year ago

The factory bean has to be outside the "someObject"

Ralph Over a year ago

@byeo: Yes, that is right. In the example above it was already outside (there is a '/' at the end of the someobject bean definition), but the indenting was confusing. -- I have improved the formatting now.

Timo Over a year ago

If you want to use this for configuration purposes, it seems pretty bloated to me. If you have twenty parameters to the application, you'll define 40 beans, 20 actual beans and 20 (not so easy to read, imho) factory beans. What I mean is that the configuration file is bloated. Still, I tried a JAVA solution and that also seemed rather bloated... :)

Ralph Over a year ago

@Timo: If you have an better/other solution for the question, then post your own answer. But if you only want to complain about Spring, then please use some blog but not abuse the comment function.

Timo Over a year ago

@Ralph I don't have a better solution, else I would have posted it. I hoped to trigger you (i.e. anybody) to take up my remark and find a "better" solution where I didn't see it immediately. I understand the philosophy of Spring in this matter and did not mean to just complain. No offence meant!

Sean Patrick Floyd · Accepted Answer · 2011-03-18 10:23:45Z

1

I've never seen this done. The big idea of Spring is that you create and initialise straight forward beans. Therefore the only methods that will be called are therefore single argument Setters(...) and Constructors. The definition of what's supported will be in the following schema:

http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

Your way around this problem is to get your bean to implement InitializingBean and call your method in the void afterPropertiesSet() method:

eg:

public void setHighThreadHold(Number highThreshHold) {}

public void setLowThreashHold(Number lowThreadHold) {}


public void afterPropertiesSet() {
    setThresholds(highThreshold,lowThreshold);
}

edited Mar 18, 2011 at 10:23

Sean Patrick Floyd

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answered Mar 18, 2011 at 8:34

roghughe

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1 Comment

Tommy Siu Over a year ago

As it is a J2SE class, I don't want to add a wrapper class just to invoke the method...

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