Hutool 6.0 Upgrade: Package Renaming, Refactoring, and Compatibility Changes

Hutool is a widely used open‑source Java utility library; upgrading from version 5.x to 6.0 introduces numerous package‑name errors because all packages were moved.

The rename stems from Hutool joining the Dromara organization (a Chinese counterpart of Apache) in 2021, prompting the new namespace org.dromara.hutool for compatibility.

Main changes

Package names changed to org.dromara.hutool .

Utility classes reorganised into sub‑packages (e.g., StrUtil → org.dromara.hutool.core.text.StrUtil ).

HTTP module refactored with a façade pattern supporting HttpUrlConnection, HttpClient4/5, and OkHttp3.

Performance optimisations and removal of redundant overloads.

Unified factory methods ( of / ofXXX ) replace previous createXXX / newXXX patterns.

Typical code differences (5.0 → 6.0):

cn.hutool.core.util.StrUtil.isEmpty("admin");
org.dromara.hutool.core.text.StrUtil.isEmpty("admin");

cn.hutool.http.HttpUtil.get("https://www.baidu.com");
org.dromara.hutool.http.HttpUtil.get("https://www.baidu.com");

Other incompatibilities include renamed classes such as ByteUtil , ObjUtil , FieldUtil , DateUtil , MapTree , and updated method names (e.g., CollUtil.newArrayList → ListUtil.of , CollUtil.split → CollUtil.partition ).

Recommendations

Heavy dependency: Keep using 5.x if the project relies heavily on Hutool; the author will continue maintaining this version.

Light dependency: Global package rename and upgrade are feasible for projects that only use simple utilities.

New projects: Evaluate whether Hutool is necessary; many utilities are now available in JDK 17, or consider maintaining a team‑specific utility library.