- **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

            final FileOutputStream os = OutputStreamUtil.create(out);
            try {
                return copyInternal(is, os);
            } finally {
                CloseableUtil.close(os);
            }
        } finally {
            CloseableUtil.close(is);
        }
    }

    /**
     * Copies from a file with the specified encoding to a file with the platform default encoding.
     *

                }
            }
        } 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;
    }

                responseData.setContentLength(0);
            }
        } 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 java.util.concurrent.TimeUnit;
import java.util.function.Consumer;

import org.apache.commons.io.IOUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.io.CloseableUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.exception.JobNotFoundException;
import org.codelibs.fess.exception.JobProcessingException;
import org.codelibs.fess.util.InputStreamThread;

                    try {
                        CloseableUtil.closeQuietly(p.getInputStream());
                    } catch (final Exception e) {
                        logger.warn("Could not close a process input stream.", e);
                    }
                });
                CommonPoolUtil.execute(() -> {
                    try {
                        CloseableUtil.closeQuietly(p.getErrorStream());

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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.curl.CurlResponse;
import org.codelibs.fess.Constants;
import org.codelibs.fess.dict.DictionaryException;
import org.codelibs.fess.dict.DictionaryFile;

            }

            final ByteBuffer buffer = ByteBuffer.allocate((int) fileSize);
            ChannelUtil.read(channel, buffer);
            return buffer.array();
        } finally {
            CloseableUtil.close(is);
        }
    }

    /**
     * Reads text from a file using the default encoding.
     *
     * @param path
     *            The file path. Must not be {@literal null} or empty.

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;

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

        @Override
        public boolean isExistClass(final String className) {