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feat(genai): migrate ImageGenWithText to gemini-2.5-flash-image #10335

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Merged
Kef131 merged 3 commits into from
Aug 25, 2026
Merged

feat(genai): migrate ImageGenWithText to gemini-2.5-flash-image #10335

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ebcf6a1
feat(genai): migrate ImageGenWithText to gemini-2.5-flash-image
Kef131 Aug 24, 2026
fff725b
Update genai/snippets/src/main/java/genai/imagegeneration/ImageGenWit…
Kef131 Aug 24, 2026
63555fa
Merge branch 'main' into feat-genai-imagegen-with-text-gemini-flash
Kef131 Aug 25, 2026
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51 changes: 27 additions & 24 deletions genai/snippets/src/main/java/genai/imagegeneration/ImageGenWithText.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,10 +19,13 @@
// [START googlegenaisdk_imggen_with_txt]

import com.google.genai.Client;
import com.google.genai.types.GenerateImagesConfig;
import com.google.genai.types.GenerateImagesResponse;
import com.google.genai.types.GeneratedImage;
import com.google.genai.types.Blob;
import com.google.genai.types.Candidate;
import com.google.genai.types.Content;
import com.google.genai.types.GenerateContentConfig;
import com.google.genai.types.GenerateContentResponse;
import com.google.genai.types.Image;
import com.google.genai.types.Part;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
Expand All @@ -33,7 +36,7 @@ public class ImageGenWithText {

public static void main(String[] args) throws IOException {
// TODO(developer): Replace these variables before running the sample.
String modelId = "imagen-4.0-generate-001";
String modelId = "gemini-2.5-flash-image";
String outputFile = "resources/output/dog_newspaper.png";
generateImage(modelId, outputFile);
}
Expand All @@ -43,32 +46,32 @@ public static Image generateImage(String modelId, String outputFile) throws IOEx
// Client Initialization. Once created, it can be reused for multiple requests.
try (Client client = Client.builder().location("global").vertexAI(true).build()) {

GenerateImagesResponse response =
client.models.generateImages(
modelId,
"A dog reading a newspaper",
GenerateImagesConfig.builder().imageSize("2K").outputMimeType("image/png").build());
GenerateContentConfig config =
GenerateContentConfig.builder().responseModalities("TEXT", "IMAGE").build();

Image generatedImage =
GenerateContentResponse response =
client.models.generateContent(modelId, "A dog reading a newspaper", config);

byte[] imageBytes =
response
.generatedImages()
.flatMap(generatedImages -> generatedImages.stream().findFirst())
.flatMap(GeneratedImage::image)
.candidates()
.flatMap(candidates -> candidates.stream().findFirst())
.flatMap(Candidate::content)
.flatMap(Content::parts)
.flatMap(
parts ->
parts.stream()
.filter(part -> part.inlineData().flatMap(Blob::data).isPresent())
.findFirst())
.flatMap(part -> part.inlineData().flatMap(Blob::data))
.orElseThrow(() -> new IllegalStateException("No image was generated by the model."));

// Read image data and write it to the output file
if (generatedImage.imageBytes().isPresent()) {
BufferedImage image =
ImageIO.read(new ByteArrayInputStream(generatedImage.imageBytes().get()));
ImageIO.write(image, "png", new File(outputFile));
BufferedImage image = ImageIO.read(new ByteArrayInputStream(imageBytes));
ImageIO.write(image, "png", new File(outputFile));

System.out.printf(
"Created output image using %s bytes\n", generatedImage.imageBytes().get().length);
}
System.out.printf("Created output image using %d bytes\n", imageBytes.length);

// Example response:
// Created output image using 1633112 bytes
return generatedImage;
return Image.builder().imageBytes(imageBytes).build();
}
}
}
Expand Down
15 changes: 7 additions & 8 deletions genai/snippets/src/test/java/genai/imagegeneration/ImageGenerationIT.java
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Original file line number Diff line number Diff line change
Expand Up @@ -41,13 +41,12 @@
@RunWith(JUnit4.class)
public class ImageGenerationIT {

private static final String IMAGEN_3_MODEL = "imagen-3.0-capability-001";
private static final String BUCKET_NAME =
System.getenv().getOrDefault("BUCKET_NAME", "java-docs-samples-testing")
.replaceFirst("^gs://", "");
private static final String PREFIX = "genai-img-generation-" + UUID.randomUUID();
private static final String OUTPUT_GCS_URI = String.format("gs://%s/%s", BUCKET_NAME, PREFIX);
private static final String IMAGEN_4_MODEL = "imagen-4.0-generate-001";
private static final String IMAGEN_MODEL = "gemini-2.5-flash-image";
private static final String VIRTUAL_TRY_ON_MODEL = "virtual-try-on-001";

private ByteArrayOutputStream bout;
Expand Down Expand Up @@ -96,7 +95,7 @@ public void tearDown() {
public void testImageGenCannyCtrlTypeWithTextAndImage() {
Optional<String> response =
ImageGenCannyCtrlTypeWithTextAndImage.cannyEdgeCustomization(
IMAGEN_3_MODEL, OUTPUT_GCS_URI);
IMAGEN_MODEL, OUTPUT_GCS_URI);
assertThat(response).isPresent();
assertThat(response.get()).isNotEmpty();
}
Expand All @@ -106,7 +105,7 @@ public void testImageGenCannyCtrlTypeWithTextAndImage() {
public void testImageGenRawReferenceWithTextAndImage() {
Optional<String> response =
ImageGenRawReferenceWithTextAndImage.styleTransferCustomization(
IMAGEN_3_MODEL, OUTPUT_GCS_URI);
IMAGEN_MODEL, OUTPUT_GCS_URI);
assertThat(response).isPresent();
assertThat(response.get()).isNotEmpty();
}
Expand All @@ -116,7 +115,7 @@ public void testImageGenRawReferenceWithTextAndImage() {
public void testImageGenScribbleCtrlTypeWithTextAndImage() {
Optional<String> response =
ImageGenScribbleCtrlTypeWithTextAndImage.scribbleCustomization(
IMAGEN_3_MODEL, OUTPUT_GCS_URI);
IMAGEN_MODEL, OUTPUT_GCS_URI);
assertThat(response).isPresent();
assertThat(response.get()).isNotEmpty();
}
Expand All @@ -126,7 +125,7 @@ public void testImageGenScribbleCtrlTypeWithTextAndImage() {
public void testImageGenStyleReferenceWithTextAndImage() {
Optional<String> response =
ImageGenStyleReferenceWithTextAndImage.styleCustomization(
IMAGEN_3_MODEL, OUTPUT_GCS_URI);
IMAGEN_MODEL, OUTPUT_GCS_URI);
assertThat(response).isPresent();
assertThat(response.get()).isNotEmpty();
}
Expand All @@ -136,7 +135,7 @@ public void testImageGenStyleReferenceWithTextAndImage() {
public void testImageGenSubjectReferenceWithTextAndImage() {
Optional<String> response =
ImageGenSubjectReferenceWithTextAndImage.subjectCustomization(
IMAGEN_3_MODEL, OUTPUT_GCS_URI);
IMAGEN_MODEL, OUTPUT_GCS_URI);
assertThat(response).isPresent();
assertThat(response.get()).isNotEmpty();
}
Expand All @@ -156,7 +155,7 @@ public void testImageGenVirtualTryOnWithTextAndImage() throws IOException {
@Ignore("Imagen models are deprecated and unavailable; migrated to Gemini in follow-up PR")
public void testImageGenWithText() throws IOException {
Image image =
ImageGenWithText.generateImage(IMAGEN_4_MODEL, "resources/output/dog_newspaper.png");
ImageGenWithText.generateImage(IMAGEN_MODEL, "resources/output/dog_newspaper.png");

assertThat(image).isNotNull();
assertThat(image.imageBytes()).isPresent();
Expand Down