Apache Commons Lang End of Life - Dates and Lifecycle

Apache Commons Lang is a Java utility library providing helper classes for strings, numbers, reflection, concurrency, and object manipulation that extend what the core Java API offers. It's one of the most widely used libraries in the Java ecosystem, commonly pulled in as a transitive dependency even by developers who never directly chose to add it.

Apache Commons Lang Lifecycle Explained

Commons Lang has no formal end of life schedule for its actively developed 3.x line (technically packaged as lang3), it's simply the current, maintained version, with releases shipping every few months. The older 2.x line, however, does have an official status: the project's own documentation states plainly that "Commons Lang 2 is in maintenance mode," distinct from and behind the actively developed 3.x line. That transition happened at version 3.0 in 2011, a deliberately backwards-incompatible move to Java 5 that changed the package name from org.apache.commons.lang to org.apache.commons.lang3, specifically so both versions could coexist on the same classpath during a gradual migration.

Within the stable 3.x line, the most disruptive event in years happened not through a major version bump, but through a routine feature release. Version 3.18.0, released in July 2025, deprecated a long list of widely used StringUtils methods, including equals(), startsWith(), contains(), and replace(), in favor of new Strings.CS (case-sensitive) and Strings.CI (case-insensitive) classes. Because these methods are used constantly across the Java ecosystem, the change broke CI builds for numerous downstream projects and prompted a JIRA ticket, LANG-1777, explicitly requesting the deprecations be reverted. It illustrates a real risk with libraries like this: even without a formal end of life event, a routine minor release can still force meaningful code changes across a codebase.

The same 3.18.0 release also shipped the underlying code fix for what later became CVE-2025-48924, a StackOverflowError in ClassUtils.getClass() triggered by very long input strings, discovered through Google's OSS-Fuzz project. The CVE identifier itself wasn't formally documented on the project site until the following release, 3.19.0, two months later.