persistence.xml configuration to fetch a property value from property file dynamically

Question

I have persistence.xml in my project. In this I have use different property tags for Data Base User Name and Password for same. I want value of this property to be set at run time while loading.

Instead of having such code,

<properties>
    <property name="javax.persistence.jdbc.user" value="root" />
    <property name="javax.persistence.jdbc.password" value="mysql" />   
</properties>

I want to have code similar to this

<properties>
    <property name="javax.persistence.jdbc.user" value=${DB_USERNAME} />
    <property name="javax.persistence.jdbc.password" value=${DB_PASSWORD} />    
</properties>

But I don't want to use Spring configuration.

Is there any way?