Anthropic: add PDF example

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: adrianolaselva

anthropic-examples/src/main/java/AnthropicPdfExample.java

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+import dev.langchain4j.data.message.PdfFileContent;
+import dev.langchain4j.data.message.TextContent;
+import dev.langchain4j.data.message.UserMessage;
+import dev.langchain4j.model.anthropic.AnthropicChatModel;
+import dev.langchain4j.model.chat.ChatModel;
+import dev.langchain4j.model.chat.response.ChatResponse;
+import org.junit.jupiter.api.Test;
+
+import java.net.URI;
+import java.util.Base64;
+
+import static dev.langchain4j.internal.Utils.readBytes;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class AnthropicPdfExample {
+
+    ChatModel model = AnthropicChatModel.builder()
+            // API key can be created here: https://console.anthropic.com/settings/keys
+            .apiKey(System.getenv("ANTHROPIC_API_KEY"))
+            .modelName("claude-sonnet-4-5-20250514")
+            .logRequests(true)
+            .logResponses(true)
+            .build();
+
+    @Test
+    void AnthropicChatModel_with_PDF_via_URL_Example() {
+
+        UserMessage userMessage = UserMessage.from(
+                PdfFileContent.from(URI.create("https://assets.anthropic.com/m/1cd9d098ac3e6467/original/Claude-3-Model-Card-October-Addendum.pdf")),
+                TextContent.from("What are the key findings in this document?")
+        );
+
+        ChatResponse chatResponse = model.chat(userMessage);
+
+        assertThat(chatResponse.aiMessage().text()).isNotBlank();
+    }
+
+    @Test
+    void AnthropicChatModel_with_PDF_via_Base64_Example() {
+
+        byte[] pdfBytes = readBytes("https://assets.anthropic.com/m/1cd9d098ac3e6467/original/Claude-3-Model-Card-October-Addendum.pdf");
+        String base64EncodedPdf = Base64.getEncoder().encodeToString(pdfBytes);
+
+        UserMessage userMessage = UserMessage.from(
+                PdfFileContent.from(base64EncodedPdf, "application/pdf"),
+                TextContent.from("Summarize this document.")
+        );
+
+        ChatResponse chatResponse = model.chat(userMessage);
+
+        assertThat(chatResponse.aiMessage().text()).isNotBlank();
+    }
+}