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+package samples;%0A%0Aimport com.slack.api.bolt.App;%0Aimport com.slack.api.bolt.AppConfig;%0Aimport com.slack.api.model.block.LayoutBlock;%0Aimport samples.util.ResourceLoader;%0Aimport samples.util.TestSlackAppServer;%0A%0Aimport java.util.List;%0A%0Aimport static com.slack.api.model.block.Blocks.*;%0Aimport static com.slack.api.model.block.composition.BlockCompositions.markdownText;%0Aimport static com.slack.api.model.block.composition.BlockCompositions.plainText;%0Aimport static com.slack.api.model.block.element.BlockElements.asElements;%0Aimport static com.slack.api.model.block.element.BlockElements.button;%0A%0Apublic class PingPongSample %7B%0A%0A    public static void main(String%5B%5D args) throws Exception %7B%0A        List%3CLayoutBlock%3E blocks = asBlocks(%0A                section(section -%3E section.text(markdownText(%22:wave: pong%22))),%0A                actions(actions -%3E actions%0A                        .elements(asElements(%0A                                button(b -%3E b.actionId(%22ping-again%22).text(plainText(pt -%3E pt.text(%22Ping%22))).value(%22ping%22))%0A                        ))%0A                )%0A        );%0A%0A        AppConfig config = ResourceLoader.loadAppConfig();%0A        App app = new App(config);%0A        app.command(%22/ping%22, (req, ctx) -%3E ctx.ack(blocks));%0A        app.blockAction(%22ping-again%22, (req, ctx) -%3E %7B%0A            ctx.respond(blocks);%0A            return ctx.ack();%0A        %7D);%0A%0A        TestSlackAppServer server = new TestSlackAppServer(app);%0A        server.start();%0A    %7D%0A%7D%0A

Add ping pong example