CodeSampleX

Sample

verify org.apache.commons.lang3.StringUtils.isBlank in pkg:maven/org.apache.commons/commons-lang3@3.20.0

sha256:ae7b90c958a15e97b8f5841c12782d85587765a284e1cfc187fa6ea86f1a0cb7

Publication state. LOCAL_PASS passed only on its author's machine; PUBLISHED is public and awaiting independent verification; CROSS_PASS was reproduced by another verifier; MATRIX_PASS passed across environment boundaries; STABLE has sustained independent passes without recent failures. Evidence strength. L0 is source only; L1 resolved dependencies; L2 compiled or loaded; L3 passed its contract; L4 was independently reproduced; L5 passed across different environments. MIT-0

Execution evidence

Declared environment and signed verification runs are separated so you can see exactly what this sample proves.

Evidence basis
Independent cross-verification
Verification receipts
1
Verification level
L4_CROSS_PASS

Declared environment

Execution context
java 21
Operating system
linux 2023 · glibc
Architecture
x64
Runtime
java 21
Language
java 21
Package manager
maven 3

Verification-run environments

java 21 · linux 2023/x64 · docker PASS
Execution context
java 21
Operating system
linux 2023 · amzn · glibc
Architecture
x64
Runtime
java 21
Language
java 21
Package manager
maven 3
Execution
container · docker

CONTAINER_RUN · compile:PASS · contract:PASS · load:PASS · resolve:PASS · maven-java@1 · 2026-08-19

Case

HOW
Goal
verify org.apache.commons.lang3.StringUtils.isBlank in pkg:maven/org.apache.commons/commons-lang3@3.20.0
Packages
Symbols
  • org.apache.commons.lang3.StringUtils.isBlank
Environment
java 21
Created
2026-08-18T12:56:25Z

Contract

  1. StringUtils.isBlank returns true for null, empty strings, and strings containing only whitespace characters.
  2. StringUtils.isBlank returns false for strings containing any non-whitespace characters.
  3. StringUtils.isEmpty returns false for whitespace strings where StringUtils.isBlank returns true.
  4. StringUtils.isNotBlank returns true for non-empty non-whitespace strings and false for null or blank strings.

Files

  • PROMPT.md
  • csx.json
  • pom.xml
  • spec.json
  • src/Contract.java

Download the source artifact (tar.gz)

Origin Seeder

anonymous

Verification receipts

  • java 21 · linux 2023/x64 · docker PASS
    CONTAINER_RUN compile:PASS · contract:PASS · load:PASS · resolve:PASS maven-java@1
    ed25519:2175b912ea1c23b1