Spring-boot does not recognize my java class

Question

I'm new to spring-boot and attempting to populate a property in a spring-boot XML with a function return value from a Java class but the class doesn't seem to be visible to the spring-boot loader. I'm probably just missing an annotation or something but any input would be great.

Here is my Java class and method:

public class AppMqttConfig {
    
        @Bean
        public SSLSocketFactory getSocketFactory()
                throws Exception {
                
                ResourceLoader resourceLoader = new DefaultResourceLoader();

                String caCrtFile = resourceLoader.getResource("classpath:/non-prod/AmazonRootCA1.pem").getFile().getAbsolutePath();

                String crtFile = resourceLoader.getResource("classpath:/non-prod/certificate.pem.crt").getFile().getAbsolutePath();

                String keyFile = resourceLoader.getResource("classpath:/non-prod/private.pem.key").getFile().getAbsolutePath();
                
                Security.addProvider(new BouncyCastleProvider());
        }
}

And here is where I'm referencing the return value of getSocketFactory:

<bean id="pahoMqttClientFactory"
          class="org.springframework.integration.mqtt.core.DefaultMqttPahoClientFactory">
        <property name="connectionOptions">
            <bean class="org.eclipse.paho.client.mqttv3.MqttConnectOptions">
                <property name="serverURIs">
                    <list>
                        <value>${mqtt.broker.url}</value>
                    </list>
                </property>
                <property name="connectionTimeout" value="${mqtt.client.connectionTimeout}" />
                <property name="keepAliveInterval" value="${mqtt.client.keepAliveInterval}" />
                <property name="cleanSession" value="${mqtt.session.clean}" />
                <property name="socketFactory" value="#{AppMqttConfig.getSocketFactory()}" />
            </bean>
        </property>
    </bean>

This is the error I'm receiving:

Property or field AppMqttConfig cannot be found on object of type org.springframework.beans.factory.config.BeanExpressionContext - maybe not public or not valid?