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Using Gemini v2.5 free tier

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Botu SUN
2025-10-30 20:50:14 +09:00
parent 9b8e79877f
commit 48497b3c73
4 changed files with 30 additions and 30 deletions
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35
src/main/java/com/voidcode/tweetbot/service/GeminiService.java
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@@ -12,7 +12,7 @@ import java.util.concurrent.TimeUnit;
public class GeminiService {
private static final Logger logger = LoggerFactory.getLogger(GeminiService.class);
private static final int MAX_TWEET_LENGTH = 280;
private static final String GEMINI_API_URL = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:generateContent";
private static final String GEMINI_API_URL = "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent";
private static final MediaType JSON = MediaType.get("application/json; charset=utf-8");
private final String apiKey;
@@ -27,7 +27,7 @@ public class GeminiService {
.writeTimeout(60, TimeUnit.SECONDS)
.build();
this.objectMapper = new ObjectMapper();
logger.info("Gemini service initialized with model: gemini-2.0-flash-exp");
logger.info("Gemini service initialized with model: gemini-2.5-flash");
}
/**
@@ -39,19 +39,16 @@ public class GeminiService {
try {
logger.info("Generating tweet with prompt: {}", prompt);
// Build the request body
String systemInstruction = "You are a creative social media content creator. Generate engaging tweets that are concise, " +
"interesting, and within Twitter's character limit. Do not include hashtags unless specifically " +
"requested. Keep it under 280 characters.";
String userPrompt = prompt + " Keep it under " + MAX_TWEET_LENGTH + " characters.";
// Build the request body with simplified prompt
String fullPrompt = "You are a creative social media content creator. Generate an engaging tweet (under 280 characters) about: " + prompt;
String jsonBody = String.format(
"{\"contents\":[{\"parts\":[{\"text\":\"%s\\n\\n%s\"}]}],\"generationConfig\":{\"temperature\":0.8,\"maxOutputTokens\":100}}",
escapeJson(systemInstruction),
escapeJson(userPrompt)
"{\"contents\":[{\"parts\":[{\"text\":\"%s\"}]}],\"generationConfig\":{\"temperature\":0.8,\"maxOutputTokens\":100000}}",
escapeJson(fullPrompt)
);
logger.debug("Request body: {}", jsonBody);
// Build the request
Request request = new Request.Builder()
.url(GEMINI_API_URL + "?key=" + apiKey)
@@ -84,7 +81,21 @@ public class GeminiService {
JsonNode parts = content.get("parts");
if (parts == null || parts.isEmpty()) {
throw new RuntimeException("No parts in Gemini response");
// Check for finish reason to understand why content was blocked
JsonNode finishReason = candidates.get(0).get("finishReason");
JsonNode safetyRatings = candidates.get(0).get("safetyRatings");
String errorMsg = "No parts in Gemini response.";
if (finishReason != null) {
errorMsg += " Finish reason: " + finishReason.asText();
}
if (safetyRatings != null) {
errorMsg += " Safety ratings: " + safetyRatings.toString();
}
errorMsg += " Full candidate: " + candidates.get(0).toString();
logger.error(errorMsg);
throw new RuntimeException(errorMsg);
}
String generatedText = parts.get(0).get("text").asText().trim();