BP_DEPENDENCY_MIRROR not honored?

[krismarc]

Seems like BP_DEPENDENCY_MIRROR is not honored.

Expected Behavior

Get dependencies from the mirror.

Current Behavior

   Downloading https://services.gradle.org/distributions/gradle-8.9-bin.zip

   Exception in thread "main" java.io.IOException: Downloading from https://services.gradle.org/distributions/gradle-8.9-bin.zip failed: timeout (10000ms)
   at org.gradle.wrapper.Install.forceFetch(SourceFile:4)
   at org.gradle.wrapper.Install$1.call(SourceFile:8)
   at org.gradle.wrapper.GradleWrapperMain.main(SourceFile:67)
   Caused by: java.net.SocketTimeoutException: Connect timed out
   at java.base/sun.nio.ch.NioSocketImpl.timedFinishConnect(NioSocketImpl.java:551)
   at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:602)
   at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327)
   at java.base/java.net.Socket.connect(Socket.java:633)
   at java.base/sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:304)
   at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:178)
   at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:533)
   at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:638)
   at java.base/sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:266)
   at java.base/sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:380)
   at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:193)
   at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1257)
   at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1143)
   at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:179)
   at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1702)
   at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1626)
   at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224)
   at org.gradle.wrapper.Install.forceFetch(SourceFile:2)
   ... 2 more

Possible Solution

Not sure. Probably needs to be checked how it's implemented in other buildpacks.

Steps to Reproduce

Expose webserver with this dependency available and set BP_DEPENDENCY_MIRROR pointing there.

Motivations

We can't use internet based sources. For other buildpacks this simply works.

[dmikusa]

It's hard to tell 100% from the snippet you included, but that looks like the output from ./gradlew not the buildpack. The gradlew scripts are not part of buildpacks and they do their own thing.

Usually, gradlew doesn't download stuff because you check in the bits it needs with your application. Not sure how you have things set up, but you may want to double-check that gradlew is set up correctly in your project.

[krismarc]

I'm trying to run paketo samples:
https://github.com/paketo-buildpacks/samples/tree/main/java/gradle
using newly introduced CNBs as additional type of lifecycle in Cloud Foundry -> cloudfoundry/community#591 (comment)

so.. if I understand correctly, I'd probably have to ship additional gradle.properties with some additional configuration making it aware of our mirror or/and proxy.

[dmikusa]

Sorry, that's not right. I misspoke there. The gradlew script will download Gradle, if you don't have it already on your env.

If you're totally offline, you'd need to tell the gradle wrapper where to fetch Gradle. It doesn't have to pull it from their servers, you can change where it downloads from in the properties file.

https://docs.gradle.org/current/userguide/gradle_wrapper.html#customizing_wrapper

You can also not include the gradlew script and the buildpack will install gradle for you. This may work but is much less flexible. The buildpack can only provide the most recent version of Gradle. If your project needs an older version, then it won't work. Using this method, the standard BP_DEPENDENCY_MIRROR settings would be honored.

[krismarc]

Ok, this worked.

   Downloading https://myhost:9443/myrepo/test/gradle-8.10-bin.zip
   .............10%.............20%.............30%.............40%.............50%.............60%.............70%.............80%.............90%.............100%
   To honour the JVM settings for this build a single-use Daemon process will be forked. For more on this, please refer to https://docs.gradle.org/8.10/userguide/gradle_daemon.html#sec:disabling_the_daemon in the Gradle documentation.

..however, getting stuck on the next step 😄 living in offline environment isn't straight forward

[dmikusa]

What are you seeing next? I'm not seeing any errors in your last post.