Aryan Ganjoo created LANG-1838:
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Summary: ClassPathUtils mishandles resources in the unnamed package
Key: LANG-1838
URL: https://issues.apache.org/jira/browse/LANG-1838
Project: Commons Lang
Issue Type: Bug
Reporter: Aryan Ganjoo
h3. Observed
For a class in the unnamed (default) package, the Class overloads of
{{ClassPathUtils.toFullyQualifiedName}} and {{toFullyQualifiedPath}} do not
produce a classpath-root resource name. On Java 8, {{Class.getPackage()}} is
null here and both calls throw {{NullPointerException}}. On Java 17, the
package name is empty and the methods return {{.Test.properties}} and
{{/Test.properties}} respectively. The Package overloads also prepend a
separator when given an empty-named package. A class loader can resolve
{{Test.properties}} at the classpath root, but not the leading-slash path
produced here.
h3. Expected
Both methods should return {{Test.properties}} for an unnamed-package context.
Named-package behavior should remain unchanged.
h3. Reproduction
Place a class in the default package and call both overloads with
{{Test.properties}} as the resource name. This reproduces on current Commons
Lang master {{9c86ffe308e7c682df3b1cf76f27dfc5bb6a2243}}. A local regression
failed on the unmodified Java 8 source (two NPE errors); the corrected
candidate passed 21 focused tests on Java 8 and Java 17. The Java 8 default
Maven build also passed. Java 11/21/25 and released binaries were not tested.
h3. Scope and possible fix
Treat a null or empty package name as the classpath root without adding a
separator; preserve named-package behavior. This is a local candidate only, not
a submitted PR. AI assistance was used for discovery, test and patch
preparation, and local validation.
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