ExampleApplicationListener.java

/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.autoconfigure.listener;

import java.util.Collections;

import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.env.MapPropertySource;
import org.springframework.core.env.PropertySource;

public class ExampleApplicationListener
		implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {

	@Override
	public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
		System.err.println("Adding extra properties");
		PropertySource<?> propertySource = new MapPropertySource("example",
				Collections.singletonMap("example.secret", "the-secret-key"));
		event.getEnvironment().getPropertySources().addFirst(propertySource);
	}

}