Shell Compatibility Issue in Nexus Repository 3.78.2-04 Startup Script

Environment

• Nexus Repository: 3.78.2-04 (Community Edition)
• OS: Debian 12.10

Issue

During service startup, the following error appears:

/opt/nexus-3.78.2-04/bin/nexus: 155: [[: not found

Root Cause

The startup script (bin/nexus) uses bash-specific syntax with /bin/sh shebang:

#!/bin/sh
# ...
if [[ "$data_dir" != /* ]]; then  # Line 155
  data_dir="$PARENT/$data_dir"
fi

On systems where /bin/sh links to a POSIX-compliant shell like dash, the [[ syntax is unsupported.

Reproduction

Standard startup via systemd produces the error:

Mar 20 21:33:46 host systemd[1]: Starting nexus.service - nexus service...
Mar 20 21:33:46 host nexus[92263]: /opt/nexus-3.78.2-04/bin/nexus: 155: [[: not found
Mar 20 21:33:46 host nexus[92263]: Starting nexus
Mar 20 21:33:46 host systemd[1]: Started nexus.service - nexus service.

Proposed Solutions

1. Change shebang from #!/bin/sh to #!/bin/bash

OR

2. Replace bash-specific syntax with POSIX-compliant case statement:

case "$data_dir" in
     /*)
       ;;
     *)
       data_dir="$PARENT/$data_dir"
       ;;
esac

Impact

The issue does not prevent service operation but generates unnecessary warnings during startup.

• Startup failure after migrating from 3.73 to 3.78 (alpine custom container)
• Failed to make connection to backend after upgrade to nexus 3.78.2

Further Discussion

Post by WeiterWeiterFertigstellen on Mar 31, 2025

We have the same issue. Will this get fixed someday?

Post by lemonsterfy on Apr 3, 2025

The latest version, nexus-3.84.0-03, has fixed this issue (see NEXUS-46734).

Post by rseddon on Apr 4, 2025

We have opened an issue internally to restore posix compliance to the startup scripts. Since this was just filed I do not have an ETA to provide.