}
            }
        } catch (final CrawlerSystemException e) {
            CloseableUtil.closeQuietly(responseData);
            throw e;
        } catch (final Exception e) {
            CloseableUtil.closeQuietly(responseData);
            throw new CrawlingAccessException("Could not access " + uri, e);
        }
        return responseData;
    }

            final ObjectInputStream ois = new ObjectInputStream(bais);
            try {
                return ois.readObject();
            } finally {
                CloseableUtil.close(ois);
            }
        } catch (final IOException ex) {
            throw new IORuntimeException(ex);
        } catch (final ClassNotFoundException ex) {

                    entryNames.add(entry.getName());
                    ZipInputStreamUtil.closeEntry(zis);
                }
            } finally {
                CloseableUtil.close(zis);
            }
        }

        @Override
        public boolean isExistClass(final String className) {

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.Date;

import org.codelibs.core.io.CloseableUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.dict.DictionaryException;
import org.codelibs.fess.dict.DictionaryFile.PagingList;
import org.codelibs.fess.dict.DictionaryManager;

import java.util.regex.Pattern;
import java.util.stream.Collectors;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.io.CloseableUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.Pair;
import org.codelibs.fess.app.service.FailureUrlService;
import org.codelibs.fess.crawler.builder.RequestDataBuilder;

import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;

import org.codelibs.core.io.CloseableUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.curl.CurlResponse;
import org.codelibs.fess.Constants;
import org.codelibs.fess.dict.DictionaryException;
import org.codelibs.fess.dict.DictionaryFile;

            updateResponseData(uri, includeContent, responseData, client, ftpInfo, file);
        } catch (final CrawlerSystemException e) {
            CloseableUtil.closeQuietly(responseData);
            throw e;
        } catch (final Exception e) {
            CloseableUtil.closeQuietly(responseData);
            throw new CrawlingAccessException("Could not access " + uri, e);
        }

        return responseData;
    }

import org.apache.commons.text.StringEscapeUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.CoreLibConstants;
import org.codelibs.core.io.CloseableUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.core.stream.StreamUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.app.web.base.SearchForm;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Date;

import org.codelibs.core.io.CloseableUtil;
import org.codelibs.curl.CurlResponse;
import org.codelibs.fess.Constants;
import org.codelibs.fess.dict.DictionaryException;
import org.codelibs.fess.dict.DictionaryFile;
import org.codelibs.fess.dict.DictionaryManager;

- **Type safety** - Extensive use of generics and null-safe operations throughout the API
- **Resource management** - Proper handling of resources with utilities like `CloseableUtil` and `DisposableUtil`

### Key Architectural Patterns
- **Factory Pattern** - `BeanDescFactory` for creating bean descriptors, `ParameterizedClassDescFactory` for generic type handling