[MWRAPPER-83] mvnw fails in zsh due to empty MAVEN_OPTS variable

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 3.1.1
• Component/s: Maven Wrapper Scripts
• Assignee: Unassigned
• Reporter: Scott Kurz
• Created: 16/Nov/22 22:19
• Updated: 17/Nov/22 10:23
• Resolved: 16/Nov/22 22:29

Description

Running mvnw in zsh, I get:

Error: Could not find or load main class
Caused by: java.lang.ClassNotFoundException:

Recreate Instructions

1. docker run -it ubuntu:focal-20221019   # next instructions are within Docker container
2.  apt update; apt install default-jdk maven zsh -y        # still have to interactively make a location selection
3.  export JAVA_HOME=/usr
4. mvn -B archetype:generate -DarchetypeGroupId=org.apache.maven.archetypes -DarchetypeArtifactId=maven-archetype-simple -DarchetypeVersion=1.4 -DgroupId=demo -DartifactId=app -Dversion=1.0
5. cd app
6. mvn org.apache.maven.plugins:maven-wrapper-plugin:3.1.1:wrapper
7. bash mvnw validate   # good, works
8. zsh mvnw validate     # bad, recreates problem

 

Thoughts{}

The problem centers around the different behavior of bash, zsh (at least with the versions in this recreate) in interpreting the expansion of the "empty" MAVEN_OPTS variable.  With bash this gets resolved to nothing whereas in zsh this is resolved to a ' ' string, which the java executable seems to treat as the main class argument, and thus fails.

Maybe someone more familiar with shell options knows a workaround, but given this seems to happen with the default options in the above environment, it seems worth addressing in the script.

Issue Links

• causes: MWRAPPER-84 Update documentation about shells