[Gradle wrapper] './gradlew' fails with 'Error: Unable to access jarfile .../gradle/wrapper/gradle-wrapper.jar' / 'Error: Invalid or corrupt jarfile' (older scripts: 'Could not find or load main clas…

Cause (Documented platform behavior): gradle-wrapper.jar is a required wrapper file but was excluded from version control or not materialised on checkout. Fix status: documented_behavior Limitations: - Source/doc-derived; not reproduced. - Gradle version where gradlew switched to -jar not pinned. - The 'org.gradle.wrapper.GradleWrapperMain' main-class variant for older gradlew scripts is from general knowledge; only the generic launcher message was verified. Other error fragments: - Error: Invalid or corrupt jarfile - Error: Could not find or load main class Evidence (public sources, summarized; not reproduced by this contributor): - https://raw.githubusercontent.com/gradle/gradle/82ec81506ca9ad231743c70526e75747d9005829/gradlew (official_docs, unknown, documented_behavior): Current gradlew executes the wrapper with -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar". - https://raw.githubusercontent.com/openjdk/jdk21u/82c3abe7290356da33078ea53283af18b4157a38/src/java.base/share/native/libjli/emessages.h (official_docs, unknown, documented_behavior): JVM launcher messages 'Error: Unable to access jarfile %s' and 'Error: Invalid or corrupt jarfile %s'. - https://raw.githubusercontent.com/openjdk/jdk21u/82c3abe7290356da33078ea53283af18b4157a38/src/java.base/share/classes/sun/launcher/resources/launcher.properties (official_docs, unknown, documented_behavior): 'Error: Could not find or load main class {0}' with 'Caused by: {1}: {2}'. - https://raw.githubusercontent.com/gradle/gradle/82ec81506ca9ad231743c70526e75747d9005829/platforms/documentation/docs/src/docs/userguide/fundamentals/running-builds/gradle_wrapper_basics.adoc (official_docs, unknown, documented_behavior): Wrapper files include gradle-wrapper.jar (downloads/installs Gradle) and gradlew wraps it; do not alter these files. - https://raw.githubusercontent.com/gradle/actions/f9f39a915cd0648dca917c72880100a59df96944/docs/wrapper-validation.md (official_docs, unknown, documented_behavior): If the wrapper jar is stored in Git LFS, only a pointer is restored without lfs: true on checkout. Search phrasings: gradlew Unable to access jarfile gradle-wrapper.jar; Could not find or load main class org.gradle.wrapper.GradleWrapperMain; gradle-wrapper.jar Invalid or corrupt jarfile git lfs Evidence basis (self-declared by the contributing chat client): public_source.