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adding example of Stagehand in Java SDK #40

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38 changes: 38 additions & 0 deletions java/hackernews/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>
<artifactId>stagehand-example</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>com.browserbase.api</groupId>
<artifactId>stagehand-java</artifactId>
<version>0.5.0</version>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<mainClass>com.example.Main</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
148 changes: 148 additions & 0 deletions java/hackernews/src/main/java/com/example/Main.java
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package com.example;

import com.browserbase.api.client.StagehandClient;
import com.browserbase.api.client.okhttp.StagehandOkHttpClient;
import com.browserbase.api.core.JsonValue;
import com.browserbase.api.models.Action;
import com.browserbase.api.models.ModelConfig;
import com.browserbase.api.models.sessions.*;

import java.util.List;
import java.util.Map;

public class Main {
private static final String SDK_VERSION = "3.0.6";

public static void main(String[] args) {
// Create client using environment variables:
// BROWSERBASE_API_KEY, BROWSERBASE_PROJECT_ID, MODEL_API_KEY
StagehandClient client = StagehandOkHttpClient.fromEnv();

// Start a new browser session
SessionStartResponse startResponse = client.sessions().start(
SessionStartParams.builder()
.modelName("openai/gpt-4o-mini")
.xLanguage(SessionStartParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);

String sessionId = startResponse.data().sessionId();
System.out.println("Session started: " + sessionId);
System.out.println("Watch live: https://www.browserbase.com/sessions/" + sessionId);

try {
// Navigate to Hacker News
client.sessions().navigate(
SessionNavigateParams.builder()
.id(sessionId)
.url("https://news.ycombinator.com")
.frameId("")
.xLanguage(SessionNavigateParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);
System.out.println("Navigated to Hacker News");

// Observe available actions on the page
SessionObserveResponse observeResponse = client.sessions().observe(
SessionObserveParams.builder()
.id(sessionId)
.instruction("find the link to view comments for the top post")
.xLanguage(SessionObserveParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);

List<SessionObserveResponse.Data.Result> results = observeResponse.data().result();
System.out.println("Found " + results.size() + " possible actions");

if (results.isEmpty()) {
System.out.println("No actions found");
return;
}

// Act on the first action
SessionObserveResponse.Data.Result result = results.get(0);
Action action = JsonValue.from(result).convert(Action.class);
System.out.println("Acting on: " + action.description());

SessionActResponse actResponse = client.sessions().act(
SessionActParams.builder()
.id(sessionId)
.input(action)
.xLanguage(SessionActParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);
System.out.println("Act completed: " + actResponse.data().result().message());

// Extract structured data from the page
SessionExtractResponse extractResponse = client.sessions().extract(
SessionExtractParams.builder()
.id(sessionId)
.instruction("extract the title and top comment from this page")
.schema(SessionExtractParams.Schema.builder()
.putAdditionalProperty("type", JsonValue.from("object"))
.putAdditionalProperty("properties", JsonValue.from(Map.of(
"title", Map.of(
"type", "string",
"description", "The title of the post"
),
"topComment", Map.of(
"type", "string",
"description", "The text of the top comment"
),
"author", Map.of(
"type", "string",
"description", "The username of the top commenter"
)
)))
.putAdditionalProperty("required", JsonValue.from(List.of("title")))
.build())
.xLanguage(SessionExtractParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);

JsonValue extractedResult = extractResponse.data()._result();
System.out.println("Extracted data: " + extractedResult);

// Run autonomous agent
SessionExecuteResponse executeResponse = client.sessions().execute(
SessionExecuteParams.builder()
.id(sessionId)
.executeOptions(SessionExecuteParams.ExecuteOptions.builder()
.instruction("Navigate back to the main Hacker News page and find the newest post")
.maxSteps(5.0)
.build())
.agentConfig(SessionExecuteParams.AgentConfig.builder()
.model(ModelConfig.ofModelConfigObject(
ModelConfig.ModelConfigObject.builder()
.modelName("openai/gpt-4o-mini")
.apiKey(System.getenv("MODEL_API_KEY"))
.build()
))
.cua(false)
.build())
.xLanguage(SessionExecuteParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);

System.out.println("Agent result: " + executeResponse.data().result().message());
System.out.println("Agent success: " + executeResponse.data().result().success());

} finally {
// End the browser session
client.sessions().end(
SessionEndParams.builder()
.id(sessionId)
.xLanguage(SessionEndParams.XLanguage.TYPESCRIPT)
.xSdkVersion(SDK_VERSION)
.build()
);
System.out.println("Session ended");
}
}
}