Accessing properties in Karaf cfg file from java?

I am using cm:property-placeholder in blueprint to load config file:

<!-- External configuration -->
<cm:property-placeholder persistent-id="mubyndle" update-strategy="reload">
    <cm:default-properties>
        <cm:property name="schemaValidation" value="false"/> 
    </cm:default-properties>
</cm:property-placeholder>

<bean id="myBean" class="com.mybean">
    <property name="abc" value="${abc}" />
</bean>

I can set values into beans, like ${abc}.
How can I access any other property of the config from java?

I am planning to add list of properties: prop1=11 prop2=22 ... propn=nn

I cannot add all in blueprint as the number varies.

Thank you, Viktor

Add reference to ConfigurationAdmin service in blueprint:
<reference id="configAdmin" interface="org.osgi.service.cm.ConfigurationAdmin" />

Set it to bean:
<bean id="myBean" class="com.mybean"> <property name="abc" value="${abc}" /> <property name="configAdmin" ref="configAdmin" /> </bean>

In bean:
private ConfigurationAdmin configAdmin;

public void setConfigAdmin(ConfigurationAdmin configAdmin) throws IOException {
    this.configAdmin = configAdmin;

    System.out.println(configAdmin);
    System.out.println(configAdmin.getConfiguration("any-persistent-id").getProperties());
}