import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.core.net.UuidUtil;
import org.codelibs.fess.app.web.base.login.ActionResponseCredential;
import org.codelibs.fess.app.web.base.login.FessLoginAssist.LoginCredentialResolver;
import org.codelibs.fess.app.web.base.login.OpenIdConnectCredential;
import org.codelibs.fess.crawler.Constants;
import org.codelibs.fess.mylasta.action.FessUserBean;

     */
    public OptionalEntity<FessUser> login(final String username, final String password) {
        // Add defensive null/blank checks
        if (StringUtil.isBlank(username) || StringUtil.isBlank(password)) {
            if (logger.isDebugEnabled()) {
                logger.debug("Login failed: username or password is blank");
            }
            return OptionalEntity.empty();

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.base.login;

/**
 * Interface for Fess credential management.
 * Provides access to user identification information.
 */
public interface FessCredential {

    /**
     * Gets the user ID for this credential.

```properties
labels.system_name=Fess
labels.search=Search
labels.login=Login
labels.logout=Logout
# ... approximately 1,056 more entries
```

**`fess_message_[locale].properties`** contains system messages such as:
```properties
errors.required={0} is required.
errors.minlength={0} cannot be less than {1}.
success.login=Logged in successfully.
# ... approximately 200 more entries
```

                rate_limit: 'It\'s currently busy. Please wait a moment and try again.',
                auth_error: 'AI service authentication failed. Please contact the administrator.',
                service_unavailable: 'The AI service is temporarily unavailable. Please try again later.',
                timeout: 'The request timed out. Please try again.',

		redirectPage.append("/error/systemerror/");
		response.sendRedirect(redirectPage.toString());
	} else {
		response.sendError(statusCode);
	}
} else if("logOut".equals(type)) {
	redirectPage.append("/login/?type=logout&code=" + statusCode);
	response.sendRedirect(redirectPage.toString());
} else if("badRequest".equals(type)) {
	redirectPage.append("/error/badrequest/");
	response.sendRedirect(redirectPage.toString());

		redirectPage.append("/error/systemerror/");
		response.sendRedirect(redirectPage.toString());
	} else {
		response.sendError(statusCode);
	}
} else if("logOut".equals(type)) {
	redirectPage.append("/login/?type=logout&code=" + statusCode);
	response.sendRedirect(redirectPage.toString());
} else if("badRequest".equals(type)) {
	redirectPage.append("/error/badrequest/");
	response.sendRedirect(redirectPage.toString());

### Baixar e Instalar/Executar

O Fess 15.3 já está disponível e pode ser baixado na [página de lançamentos](https://github.com/codelibs/fess/releases "download"). As opções de download incluem: deb, rpm, zip.

Os comandos a seguir mostram como usar o download em formato zip:

    $ unzip fess-15.3.x.zip

import static org.codelibs.core.stream.StreamUtil.stream;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.FessUser;
import org.lastaflute.web.login.TypicalUserBean;

/**
 * The user bean for Fess.
 *
 * @author jflute
 */
public class FessUserBean extends TypicalUserBean<String> { // #change_it also LoginAssist

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.login;

import jakarta.validation.constraints.NotBlank;

/**
 * Form for password change.
 */
public class PasswordForm {

    /**
     * Default constructor.
     */
    public PasswordForm() {