validateApi(body, messages -> {});
        if (body.documents == null) {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, "documents is required."));
        }
        if (body.documents.isEmpty()) {
            throwValidationErrorApi(messages -> messages.addErrorsCrudFailedToCreateCrudTable(GLOBAL, "documents is empty."));
        }

    /**
     * Color style for transfer messages.
     * @since 4.0.0
     */
    @Config(defaultValue = MAVEN_STYLE_TRANSFER_DEFAULT)
    public static final String MAVEN_STYLE_TRANSFER = MAVEN_STYLE_PREFIX + MAVEN_STYLE_TRANSFER_NAME;

    /**
     * Color style for trace messages.
     * @since 4.0.0
     */
    @Config(defaultValue = MAVEN_STYLE_TRACE_DEFAULT)

├── fess_label.properties           # Base English labels (fallback)
├── fess_label_[locale].properties  # Language-specific labels (~1,056 lines)
├── fess_message.properties         # Base English messages (fallback)
└── fess_message_[locale].properties # Language-specific messages (~200 lines)
```

### Naming Convention

- **Language only**: `fess_label_en.properties`, `fess_label_ja.properties`

        final LlmChatRequest request = new LlmChatRequest();
        final List<LlmMessage> messages = new ArrayList<>();
        messages.add(LlmMessage.user("Message 1"));
        messages.add(LlmMessage.assistant("Message 2"));

        request.setMessages(messages);

        assertSame(messages, request.getMessages());
        assertEquals(2, request.getMessages().size());
    }

    @Test

    body: str = ""
    events: list[MessageEvent] = []


class Message(BaseModel):
    input: str
    output: MessageOutput


app = FastAPI(title="Minimal FastAPI App", version="1.0.0")


@app.post("/messages", response_model=Message)
async def create_message(input_message: str) -> Message:
    return Message(
        input=input_message,
        output=MessageOutput(body=f"Processed: {input_message}"),

                throw new SsoMessageException(
                        messages -> messages.addErrorsFailedToProcessSsoRequest(UserMessages.GLOBAL_PROPERTY_KEY, e.getMessage()),
                        "Failed to process metadata.", e);
            }
        })
                .orElseThrow(() -> new SsoMessageException(
                        messages -> messages.addErrorsFailedToProcessSsoRequest(UserMessages.GLOBAL_PROPERTY_KEY, "Invalid state."),

)

// TargetStats contains statistics for a target.
type TargetStats struct {
	// QueueLength is the queue length if any messages are queued.
	QueueLength int

	// TotalMessages is the total number of messages sent in the lifetime of the target
	TotalMessages int64

	// FailedMessages should log message count that failed to send.
	FailedMessages int64

        @DisplayName("Should handle deep message chaining")
        void testDeepMessageChaining() {
            TestServerMessageBlock2[] messages = new TestServerMessageBlock2[10];
            for (int i = 0; i < messages.length; i++) {
                messages[i] = new TestServerMessageBlock2(mockConfig);
                if (i > 0) {
                    assertTrue(messages[0].chain(messages[i]));
                }
            }

        validate(form, messages -> {}, this::asDetailsHtml);
        verifyToken(this::asDetailsHtml);
        final String id = form.id;
        failureUrlService.getFailureUrl(id).alwaysPresent(entity -> {
            failureUrlService.delete(entity);
            saveInfo(messages -> messages.addSuccessCrudDeleteCrudTable(GLOBAL));
        });
        return redirect(getClass());

        verifyCrudMode(form.crudMode, CrudMode.DETAILS, this::asListHtml);
        validate(form, messages -> {}, this::asDetailsHtml);
        verifyToken(this::asDetailsHtml);
        final String id = form.id;
        jobLogService.getJobLog(id).alwaysPresent(entity -> {
            jobLogService.delete(entity);
            saveInfo(messages -> messages.addSuccessCrudDeleteCrudTable(GLOBAL));
        });
        return redirect(getClass());