Java 类com.google.inject.internal.ImmutableMap 实例源码

@Bean
public ServletContextAttributeExporter servletContextAttributeExporter() {
    ServletContextAttributeExporter exporter = new ServletContextAttributeExporter();
    exporter.setAttributes(
            ImmutableMap.<String, Object>builder()
            .put(Pac4jClient.GOOGLE_OAUTH2.getClientKey(), googleClient())
            .put(Pac4jClient.GITHUB.getClientKey(), gitHubClient())
            .put(Pac4jClient.TWITTER.getClientKey(), twitterClient())
            .build()
    );
    return exporter;
}