Here's a little bit of that history.

## Alternatives { #alternatives }

I have been creating APIs with complex requirements for several years (Machine Learning, distributed systems, asynchronous jobs, NoSQL databases, etc), leading several teams of developers.

As part of that, I needed to investigate, test and use many alternatives.

### DBFlute Generated Code
```
opensearch/{index}/
├── bsentity/, bsbhv/    # Base classes (DO NOT EDIT)
├── exentity/, exbhv/    # Extended classes (customize here)
└── cbean/               # Condition beans (query builders)
```

### Form Classes
- POJOs with public fields (no getters/setters)
- Validation: `@Required`, `@Size`, `@ValidateTypeFailure`, `@Pattern`
- Include `crudMode` field for CRUD operations

# CLAUDE.md - AI Assistant Guide for CodeLibs CoreLib

Java 21 utility library. Maven build system, Apache License 2.0.

## Repository Structure

```
src/main/java/org/codelibs/core/
├── beans/       # Bean manipulation & introspection (converter/, factory/, impl/, util/)
├── collection/  # Enhanced collections (LruHashMap, CaseInsensitiveMap)
├── concurrent/  # Concurrency utilities
├── convert/     # Type conversion (*ConversionUtil)

labels.facet_timestamp_1year=Within a year
labels.facet_timestamp_3month=Within 3 months
labels.facet_timestamp_6month=Within 6 months
labels.facet_timestamp_2year=Within 2 years
labels.facet_timestamp_3year=Within 3 years
labels.facet_contentLength_title=Size
labels.facet_contentLength_10k=  - 10KB
labels.facet_contentLength_10kto100k=10KB - 100KB
labels.facet_contentLength_100kto500k=100KB - 500KB

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.codelibs.core.beans.util.BeanUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.fess.Constants;
import org.codelibs.fess.annotation.Secured;

labels.facet_timestamp_1year=Within a year
labels.facet_timestamp_3month=Within 3 months
labels.facet_timestamp_6month=Within 6 months
labels.facet_timestamp_2year=Within 2 years
labels.facet_timestamp_3year=Within 3 years
labels.facet_contentLength_title=Size
labels.facet_contentLength_10k=  - 10KB
labels.facet_contentLength_10kto100k=10KB - 100KB
labels.facet_contentLength_100kto500k=100KB - 500KB

**FastAPI** wouldn't exist if not for the previous work of others.

There have been many tools created before that have helped inspire its creation.

I have been avoiding the creation of a new framework for several years. First I tried to solve all the features covered by **FastAPI** using many different frameworks, plug-ins, and tools.

A GODEBUG setting may not be added if doing so is infeasible,
but that should be extremely rare.

GODEBUG settings added for compatibility will be maintained
for a minimum of two years (four Go releases).
Some, such as `http2client` and `http2server`,
will be maintained much longer, even indefinitely.

When possible, each GODEBUG setting has an associated
[runtime/metrics](/pkg/runtime/metrics/) counter

    public static final String LABELS_facet_timestamp_6month = "{labels.facet_timestamp_6month}";

    /** The key of the message: Within 2 years */
    public static final String LABELS_facet_timestamp_2year = "{labels.facet_timestamp_2year}";

    /** The key of the message: Within 3 years */
    public static final String LABELS_facet_timestamp_3year = "{labels.facet_timestamp_3year}";

    /** The key of the message: Size */

import java.util.function.UnaryOperator;
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.beans.util.BeanUtil;
import org.codelibs.core.exception.ResourceNotFoundRuntimeException;
import org.codelibs.core.io.FileUtil;
import org.codelibs.core.io.ResourceUtil;
import org.codelibs.core.lang.StringUtil;