Shinsuke Sugaya <******@****.***> 1774681159 +0900

                }
                return "/error/system.jsp";
            }
        });
    }

    protected Consumer<List<String>> createMessageNameList() {
        return nameList -> nameList.add("fess_message");
    }

    protected FessUserLocaleProcessProvider createUserLocaleProcessProvider() {
        return new FessUserLocaleProcessProvider();
    }

```
src/main/resources/
├── 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`

 */
package org.codelibs.fess.mylasta.action;

import org.lastaflute.core.message.UserMessage;

/**
 * The keys for message.
 * @author FreeGen
 */
public class FessMessages extends FessLabels {

    /** The serial version UID for object serialization. (Default) */
    private static final long serialVersionUID = 1L;

    /** The key of the message:  */

        // Setup - test with different message codes
        final String message = "Query validation error";
        final VaMessenger<FessMessages> unknownErrorCode =
                messages -> messages.addErrorsInvalidQueryUnknown(UserMessages.GLOBAL_PROPERTY_KEY);
        final VaMessenger<FessMessages> parseErrorCode =
                messages -> messages.addErrorsInvalidQueryParseError(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute

        // Setup - test with different message codes
        final String message = "Test message";
        final VaMessenger<FessMessages> loginErrorCode = messages -> messages.addErrorsSsoLoginError(UserMessages.GLOBAL_PROPERTY_KEY);
        final VaMessenger<FessMessages> logoutErrorCode = messages -> messages.addSuccessSsoLogout(UserMessages.GLOBAL_PROPERTY_KEY);

        // Execute

        final FessMessages messages = new FessMessages();
        final FessMessages result = messages.addErrorsOperationAlreadyRunning("testProperty", "host1");
        assertNotNull(result);
        assertFalse(result.isEmpty());
        assertTrue(result.hasMessageOf("testProperty"));
    }

    @Test
    public void test_addErrorsOperationAlreadyRunning_withDifferentHosts() {
        final FessMessages messages1 = new FessMessages();

    private final transient VaMessenger<FessMessages> messageCode;

    /**
     * Creates a new InvalidQueryException with message code, message, and cause.
     *
     * @param messageCode the message code for localized error messages
     * @param message the detailed error message
     * @param cause the cause of the exception
     */

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.exception;

import org.codelibs.fess.mylasta.action.FessMessages;
import org.lastaflute.web.validation.VaMessenger;

/**
 * Exception thrown during SSO (Single Sign-On) processing with message code support.
 *

        assertEquals("{errors.front_footer}", FessMessages.ERRORS_front_footer);
        assertEquals("{errors.front_prefix}", FessMessages.ERRORS_front_prefix);
        assertEquals("{errors.front_suffix}", FessMessages.ERRORS_front_suffix);
        assertEquals("{errors.header}", FessMessages.ERRORS_HEADER);
        assertEquals("{errors.footer}", FessMessages.ERRORS_FOOTER);