Maven Repository – Go Offline with dependencies

Maven Repository

My team uses the pom.xml to generate a repository which is handed off to the secondary developers. For instance, I have a custom db2 jar

## Update your localRepository
Start a Shell
cd ~/.m2
vim settings.xml
add `<localRepository>/Users/userid/git/client-app/documentation/repo/local_repo</localRepository>`
Note: the path is relative to the location of my repo
You may have to create the folder local_repo
Save the file to where it makes most sense

## Take the Repo Offline
Change directory to the `repo` folder
`mvn dependency:go-offline`
cd local_repo
remove any previous zip
Run `zip -9 -v -r ‘base-path-for-jars-you-want/’` (Only archives into the zip the dependencies you want)
Upload the zip to the `client-app` wiki

## Remove your local repository line
Start a shell
cd ~/.m2
vim settings.xml
remove the `<localRepository>` node
Save the file

Maven Thread Speed Up

Like many developers, I have tons of jobs running to compile, unit and integration test my code.  These jobs take anywhere from 30 seconds to 30 minutes.

Some simple operations took a while…. I wondered why… Thanks to Oleg @ ZeroTurnAround I have an answer – Your Maven build is slow. Speed it up!

I applied the setting to speed up my build (30 minutes dropped to 10 minutes)

mvn clean package -T 4 -S local-m2/settings.xml

I hope this helps others.

Localized Maven Repositories – A Hot Tip

I’ve been building a Maven Project that uses some jar files which are not in Maven Central (or any repository). I ran across this article – Local Maven Dependencies. I found it very helpful.

Simply, do the following:

create a directory (d:/folder/repo)

Run a maven deploy to url (it’ll create the repository details based on the flags)

mvn deploy:deploy-file -Durl=file://d:/folder/repo/ -Dfile=Common.jar -DgroupId=xyz -DartifactId=Common -Dpackaging=jar -Dversion=1.0

and add to your Maven Project’s POM
<id>Local Repository</id>

Then reference your jar file with a new dependency.

The code should almost write itself from there 🙂

My Experience with maven-antrun-plugin

I’ve been spending some time with maven so that files which matched a certain criteria were automatically moved in the project – OpenNTF SocialSDK.  The files only should be moved when the files don’t have -SNAPSHOT at the end of the version.

I started modifying some code that used maven-antrun-plugin, which bridges the maven-ant worlds.  I tried mixing complex conditional depends on and unless statements from Ant targets and Ant Tasks. Where the target “depends” on another target, you should be able to conditionally execute a target.  I wrote the code, however it never ran cleanly, always throwing an error.

I split the ant tasks and targets into a separate file, and the code now runs cleanly.  From the best practices I’ve read it’s better to pick one, and only use one Maven file or Ant file, I however couldn’t get it to read depends on targets.

I hope you find this ant-maven hack as helpful as I did.


The solution is found in the commit – added support for automatically moving the cdnjs files when a release.