add java jre to nodejs, is it possible?

[dmitry-mightydevops]

• I have nodejs app, I can compile it successfully with paketo-builpacks/nodejs
• however my app depends on the firebase cli, which needs https://www.npmjs.com/package/firebase-tools to run firebase simulator
• which in turn require java JRE
• I compile image using cnb/lifecycle/creator inside tekton

So is it possible to add JRE without creating custom builder or runner.

I tried to create simple build.gradle file, but compilation fails:

plugins {
    id 'base' // Apply the base plugin, which provides a clean task
}

task runFirebaseEmulators(type: Exec) {
    commandLine 'firebase', 'emulators:exec', '--project=fakeproject', 'npm run test'
}

pack build firebase-functions --env BP_NODE_PROJECT_PATH=functions --env BP_JAVA_INSTALL_NODE=true --builder paketobuildpacks/builder-jammy-base

...
[builder] Paketo Buildpack for Syft 1.47.0
[builder]   https://github.com/paketo-buildpacks/syft
[builder]     Downloading from https://github.com/anchore/syft/releases/download/v0.105.1/syft_0.105.1_linux_amd64.tar.gz
[builder]     Verifying checksum
[builder]     Writing env.build/SYFT_CHECK_FOR_APP_UPDATE.default
[builder] 
[builder] Paketo Buildpack for Gradle 7.11.0
[builder]   https://github.com/paketo-buildpacks/gradle
[builder]   Build Configuration:
[builder]     $BP_EXCLUDE_FILES                                                                       colon separated list of glob patterns, matched source files are removed
[builder]     $BP_GRADLE_ADDITIONAL_BUILD_ARGUMENTS                                                   the additionnal arguments (appended to BP_GRADLE_BUILD_ARGUMENTS) to pass to Gradle
[builder]     $BP_GRADLE_BUILD_ARGUMENTS             --no-daemon -Dorg.gradle.welcome=never assemble  the arguments to pass to Gradle
[builder]     $BP_GRADLE_BUILD_FILE                                                                   the location of the main build config file, relative to the application root
[builder]     $BP_GRADLE_BUILT_ARTIFACT              build/libs/*.[jw]ar                              the built application artifact explicitly.  Supersedes $BP_GRADLE_BUILT_MODULE
[builder]     $BP_GRADLE_BUILT_MODULE                                                                 the module to find application artifact in
[builder]     $BP_GRADLE_INIT_SCRIPT_PATH                                                             the path to a Gradle init script file
[builder]     $BP_INCLUDE_FILES                                                                       colon separated list of glob patterns, matched source files are included
[builder]     $BP_JAVA_INSTALL_NODE                  true                                             whether to install Yarn/Node binaries based on the presence of a package.json or yarn.lock file
[builder]     $BP_NODE_PROJECT_PATH                  functions                                        configure a project subdirectory to look for `package.json` and `yarn.lock` files
[builder]   Gradle 8.7.0: Contributing to layer
[builder]     Downloading from https://downloads.gradle.org/distributions/gradle-8.7-bin.zip
[builder]     Verifying checksum
[builder]     Expanding to /layers/paketo-buildpacks_gradle/gradle
[builder]     Creating cache directory /home/cnb/.gradle
[builder]   Compiled Application: Contributing to layer
[builder]     Executing gradle --no-daemon -Dorg.gradle.welcome=never assemble
[builder]       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/8.7/userguide/gradle_daemon.html#sec:disabling_the_daemon in the Gradle documentation.
[builder]       Daemon will be stopped at the end of the build 
[builder]       > Task :assemble UP-TO-DATE
[builder]       
[builder]       BUILD SUCCESSFUL in 3s
[builder] 
[builder] unable to invoke layer creator
[builder] unable to contribute application layer
[builder] unable to resolve artifacts
[builder] unable to find any built artifacts for pattern(s):
[builder] build/libs/*.[jw]ar. If this is unexpected, please try setting `rootProject.name` in `settings.gradle` or add a project.toml file and exclude the `build/` directory. For details see https://buildpacks.io/docs/app-developer-guide/using-project-descriptor/.
[builder] ERROR: failed to build: exit status 1
ERROR: failed to build: executing lifecycle. This may be the result of using an untrusted builder: failed with status code: 51

so it fails. Any ideas?

[dmikusa]

The Java buildpack has a number of JVM vendors you can choose from, however, it's really meant to be used for building Java apps. That's the issue you're seeing here. It sees the gradle file and wants to run a grade build. We do support building Javascript based frontend software with the Java buildpack, but it's focused around having Maven or Gradle run the build and call out to Node/npm to do the build steps (it's a Java-first build).

If you just need java on the class path and don't really care about the details, the easiest thing is probably to just use the apt-buildpack and tell it to install whatever JRE is available.

https://github.com/dmikusa/apt-buildpack

You can install default-jre or default-11-jre or default-17-jre or whatever major version you need.

https://ubuntu.com/tutorials/install-jre#2-installing-openjdk-jre