I am trying to use a MethodInvokingFactoryBean to get an instance of a com.amazonaws.regions.Region for use in configuring a com.amazonaws.services.kinesis.AmazonKinesisClient. I am doing this in Blueprint, Camel, Karaf.
<bean id="awsRegion" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetClass" value="com.amazonaws.regions.RegionUtils"/>
<property name="targetMethod" value="getRegion"/>
<property name="arguments">
<list>
<value>EU-WEST-1</value>
</list>
</property>
</bean>
<bean id="kinesisClient" class="com.amazonaws.services.kinesis.AmazonKinesisClient">
<property name="region" ref="awsRegion"/>
</bean>
This seems like it should work, with the first bean creating a Region, and the second bean using it.
However, I get an error that makes it seem like the MethodInvokingFactoryBean is just returning an instance of itself instead of Region.
org.osgi.service.blueprint.container.ComponentDefinitionException: Error setting property: PropertyDescriptor <name: region, getter: null, setter: [class com.amazonaws.AmazonWebServiceClient.setRegion(class com.amazonaws.regions.Region)]
...
Caused by: java.lang.Exception: Unable to convert value org.springframework.beans.factory.config.MethodInvokingFactoryBean#2289c050 to type com.amazonaws.regions.Region
The method I'm invoking in RegionUtils should return a Region
https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/regions/RegionUtils.html#getRegion-java.lang.String-
I came upon this way of getting the Region in the Client in this question, where the solution seemed to work for the asker.
Bind aws sqs region camel
At first , apache-camel tag is excess here. As second, you missed that asker is using spring context and you are using blueprint context. Try something like this:
<bean id="awsRegion" class="com.amazonaws.regions.RegionUtils" factory-method="getRegion">
<argument value="EU-WEST-1"/>
</bean>
<bean id="kinesisClient" class="com.amazonaws.services.kinesis.AmazonKinesisClient">
<property name="region" ref="awsRegion"/>
</bean>
EDIT: just tested this example with latest aws-java-sdk and it is worked
Related
I've been using org.springframework.beans.factory.config.PropertyPlaceholderConfigurer and in my experience ("citation needed" LOL) it sets the property values globally.
Is there a way to specify different PropertyPlaceholderConfigurer instances for different beans within the same application context xml?
My current code is similar to
<bean id="a" class="X">
<property name="foo" value="bar"/>
<property name="many" value="more"/>
</bean>
<bean id="b" class="X">
<property name="foo" value="baz"/>
<property name="number_of_properties" value="a zillion"/>
</bean>
I would like to do something like (pseudo-code below):
<bean id="a" class="X">
... parse the contents of "a.properties" here ...
</bean>
<bean id="b" class="X">
... parse the contents of "b.properties" here ...
</bean>
The above is non-working pseudo code to illustrate the concept; the point being, I want a different properties file to feed each bean.
WHY?
I want to have those specific properties in separate properties file and not in XML.
I think the following link can br helpful to you.
Reference Link
where #Value("${my.property.name}") annotation is used to bind the property file to a variable of type Properties which will reside in your bean class where you intend to use that properties file.
and you can define multiplte proprtiesplaceholder as below:
<bean id="myProperties"
class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="locations">
<list>
<value>classpath*:my.properties</value>
</list>
</property>
</bean>
and use the id as reference in your bean variable to initialize properties file to the bean.
And it will be handy to include with placeholder bean.
Kindly refer Importance of Unresolvable Placeholder link for detailed info regarding its usage.
Hope this was helpful.
<bean name="staticHubInitializer" class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="staticMethod" value="very.public.api.StaticHub.setInstance"/>
<property name="arguments">
<list>
<ref bean="myPrecious"/>
</list>
</property>
</bean>
as i know spring ioc container create a bean MethodInvokingFactoryBean then it calls the setInstance() with parameter myPrecious just want a clarification is there any way we can suggest that dont create a object of it call directly ???
or is there any other way we can invoke the data member and assign the value to it directly.
I have a spring bean my_bean with a property my_map, and I want to inject it with the value "X" or with the value "Y". The bean:
<bean id="my_bean">
<property name="my_map">
<map>
<entry key="p" value="X" />
</map>
</property>
</bean>
It's referenced in a very deep hierarchy by the bean root_a:
<bean id="root_a">
<ref bean="root_a_a"/>
</bean>
<bean id="root_a_a">
<ref bean="root_a_a_a"/>
</bean>
<bean id="root_a_a_a">
<ref bean="my_bean"/>
</bean>
and this entire deep hierarchy is referenced again from the bean root_b. In the ref of my_bean from this hierarchy I would the property to be injected with the value "Y", but I would not like to duplicate the entire hierarchy twice.
<bean id="root_b">
<ref bean="root_a_a"/>
</bean>
How do I do this in the spring XML? can you think of a clever spring EL solution? something else? I prefer all my configuration to be done in the XML and no Java code...
By default Spring beans are singletons, which means that once bean="my_bean" is created it is shared between other components e.g. shared between A => bean id="root_a_a_a" and B => bean id="root_b_b_b"
The answer to your question depends on what exactly you are trying to achieve.
Two Beans
If bean="my_bean" does not need to be shared between A and B, then create two beans:
inject this one to A
<bean id="myBeanX" class="My">
<property name="culprit" value="X"/>
</bean>
and this one to B
<bean id="myBeanY" class="My">
<property name="culprit" value="Y"/>
</bean>
notice they both are instances of the same class.
You can also inline them into collaborators (A / B) if you don't need them for anything else:
<bean id="root_a_a_a">
<constructor-arg>
<bean class="My">
<property name="culprit" value="X"/>
</bean>
</constructor-arg>
</bean>
You can also have a factory bean that creates root_a_a_a given the property for a class My, but that would be an overkill.
Single Bean
In case A and B needs to share the exact same reference to bean="my_bean", the question is: are you ok with A and B changing my_bean's state after my_bean is created? Probably not.
If you are, which would be 0.41172% chance, you can change my_bean's value to whatever you need in A's or B's constructors => would not recommend
Hence you either would go with the Two Bean approach (which is most likely what you want), or you would need to refactor a property for "X" and "Y" into another e.g. myConfig component.
EDIT after the question was edited
If root_a and root_b will not be used together in the same instance of the context,you can use Spring Profiles (example), or SpEL / Property Based solutions (example)
e.g.
<bean id="my_bean">
<property name="my_map">
<map>
<entry key="p" value="${ENV_SYSTEM:X}" />
</map>
</property>
</bean>
It will set it to X by default, unless a ENV_SYSTEM system variable is set (e.g. to Y).
I want to create a spring bean as below.
<bean id="qNameString" class="javax.xml.xpath.XPathConstants.STRING"/>
Here I want the reference to return type which is a QName but I understand the way I referred is wrong. Can someone please help on this.
That won't work, because class="javax.xml.xpath.XPathConstants.STRING" makes no sense, since what you're referring to isn't a class.
You can refer to static fields using <util:constant>, as documented here:
<property name="...">
<util:constant static-field="javax.xml.xpath.XPathConstants.STRING"/>
</property>
Spring can create a QName for you like this:
<bean id="qName" class="java.xml.namespace.QName">
<constructor index="0" value="localpart"/>
<constructor index="1" value="namespaceURI"/>
</bean>
Replace localpart and namespaceURI with the local name and namespace.
To reference a constant in a class, like javax.xml.xpath.XPathConstants.STRING
<bean id="qNameString" class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean">
<property name="targetField" value="javax.xml.xpath.XPathConstants.STRING"/>
</bean>
A shorter version is available with the util schema:
<util:constant static-field="java.xml.xpath.XPathConstants.STRING"/>
Apart from being shorter, the id of the bean will be java.xml.xpath.XPathConstants.STRING rather than qNameString.
See FieldRetrievingFactoryBean and The util schema
I have a method invoking bean which calls a method to perform some sort of initialization on a targetBean and another bean who needs a twitter class albeit initialized.
<bean id="twitter" class="twitter4j.Twitter"></bean>
<bean id="twitterInjector"
class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
<property name="targetObject" ref="twitter"/>
<property name="targetMethod">
<value>setOAuthConsumer</value>
</property>
<property name="arguments">
<list>
<value>consumerKey</value>
<value>consumerSecret</value>
</list>
</property>
</bean>
<bean id="MyPageController"
class="com.hardwire.controller.MyPageController">
<property name="twitter" ref="What should I put here? twitter or
twitterInjector?/>
.
.
.
</bean>
What should I inject into the MyPageController, twitterInjector or twitter?
MethodInvokingFactoryBean - like all other factory beans in Spring - is primarily intended to produce a new bean; in this particular case by invoking a method of some other bean (or class). Your setOAuthConsumer method doesn't seem like it would return a bean, so using MethodInvokingFactoryBean may not be the best approach in these circumstances.
If I am mistaken and it does return a bean (in which case consider renaming it) and that's the bean you want injected in your controller then you should use twitterInjector as ref value. If you really want twitter in your controller, then you should use twitter.