[CI] Download maven dependencies firstly

[v1v]

What does this PR do?

• Use go-offline prebuild to fetch all the dependencies.
• Set maven.wagon.httpconnectionManager.ttlSeconds to 25 seconds and maven.wagon.http.retryHandler.count to 3 retries.

Why

I still see issues related to the connection reset :/

Further details

The documentation for maven.wagon.httpconnectionManager.ttlSeconds is available in the source code:

• https://github.com/apache/maven-wagon/blob/wagon-3.4.1/wagon-providers/wagon-http-shared/src/main/java/org/apache/maven/wagon/shared/http/AbstractHttpClientWagon.java#L297-L305

Documentation for maven.wagon.http.retryHandler.count is in https://maven.apache.org/wagon/wagon-providers/wagon-http/

This is similar to the change made in Pulsar: apache/pulsar#8386

[ghost]

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Build stats

• Build Cause: Pull request #1556 updated

• Start Time: 2020-12-07T16:16:18.167+0000

• Duration: 52 min 58 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1629
Skipped	12
Total	1641

[eyalkoren]

Ahh, it fails at self artifacts that are only created at mvn install - https://apm-ci.elastic.co/blue/organizations/jenkins/apm-agent-java%2Fapm-agent-java-mbp/detail/PR-1556/1/pipeline

[v1v]

Good catch, I enabled the --fail-never in the packer-cache.sh script, but I did not enable this in the script. I'll do it now

[eyalkoren]

Maybe you can use excludeGroupIds to exclude resolving co.elastic.apm dependencies?

[v1v]

Unfortunately excludeGroupIds does not get honoured for a multimodule maven project. Might be related to MDEP-516

I've tried locally with:

• ./mvnw -U org.apache.maven.plugins:maven-dependency-plugin:3.1.2:go-offline -DexcludeGroupIds=co.elastic.apm
• Even I added some changes in the pom.xml but same behaviour

So, the alternative is to run go-offline with never fail once and might reduce the number of times we hit the issue :/