Spring上下文：布尔值的属性占位符

Question

I am working on an application where I have two classes both implementing a common interface. So in time of bean declaration, I am going to mark one of them primary in my app-context.xml file. I can achieve this by simply declaring the primary bean like this:

<bean id="oracleImpl" class="com.me.dao.OracleImpl" primary="true">
</bean>

Now I don't want to hard code which of the beans is going to be the primary bean, rather want to read the true/false value from a properties file. So I went like this:

<context:property-placeholder location="classpath:jdbc.properties"/>

<bean id="oracleImpl" class="com.me.dao.OracleImpl" primary="${oracle.primary}">
</bean>

<bean id="pgsqlImpl" class="com.me.dao.PgsqlImpl" primary="${pgsql.primary}">
</bean>

The values of oracle.primary and pgsql.primary are defined in the file jdbc.properties along with other jdbc (non-boolean) properties.

But it doesn't work and says, "'${oracle.primary}' is not a valid value for 'boolean'"

I have a feeling it is something to do with the xsd validators. Browsing through this site and google gave me this much idea, but got no real solution. Can any body help?

Answer 1

This will not work.

As of 3.2.5.RELEASE only the following bean definition elemets support property placeholder:

• parent name
• bean class name
• factory bean name
• factory method name
• scope
• property values
• indexed constructor arguments
• generic constructor arguments

See the BeanDefinitionVisitor 's visitBeanDefinition method for the details. This method is used by the PlaceholderConfigurerSupport .

I would recommend you to create a feature request in the spring issue management system .

PS: if you create an issue please add a comment to the issues url.