When no packaging is specified, an invalid artifact URL is assigned to the *_ARTIFACT_URL env variable.

E.g. use the following configuration:

• Name=ANY_JAR
• Repository Base URL=http://repo1.maven.org/maven2
• Artifact Group ID=org.apache.commons
• Artifact ID=commons-lang3
• Packaging=

When starting a build, it is provided with the following environment variables:

ANY_JAR_ARTIFACT_URL=http://repo1.maven.org/maven2/org/apache/commons/commons-lang3/3.4/commons-lang3-3.4.
ANY_JAR_VERSION=3.4
ANY_JAR_ARTIFACT_ID=commons-lang3
ANY_JAR_GROUP_ID=org.apache.commons

You'll notice:

1. The artifact URL is missing the jar extension
2. The variable ANY_JAR_PACKAGING is missing