Support JDK 15

[izeye]

JDK 15 doesn't seem to be supported yet. If I run bootBuildImage task from Spring Boot Gradle plugin with sourceCompatibility set to be 15, the following error occurs:

    [creator]     Paketo BellSoft Liberica Buildpack 3.2.0
    [creator]       https://github.com/paketo-buildpacks/bellsoft-liberica
    [creator]       Build Configuration:
    [creator]         $BP_JVM_VERSION              15.*            the Java version
    [creator]       Launch Configuration:
    [creator]         $BPL_JVM_HEAD_ROOM           0               the headroom in memory calculation
    [creator]         $BPL_JVM_LOADED_CLASS_COUNT  35% of classes  the number of loaded classes in memory calculation
    [creator]         $BPL_JVM_THREAD_COUNT        250             the number of threads in memory calculation
    [creator]         $JAVA_TOOL_OPTIONS                           the JVM launch flags
    [creator]       No valid JRE available, providing matching JDK instead. Using a JDK at runtime has security implications.
    [creator]     
    [creator]     Paketo BellSoft Liberica Buildpack 3.2.0
    [creator]       unable to find dependency
    [creator]       no valid dependencies for jdk, 15.*, and io.buildpacks.stacks.bionic in [(jre, 8.0.265, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jre, 11.0.8, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jre, 14.0.2, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jdk, 8.0.265, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jdk, 11.0.8, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jdk, 14.0.2, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3]) (jvmkill, 1.16.0, [io.buildpacks.stacks.bionic org.cloudfoundry.stacks.cflinuxfs3])]
    [creator]     ERROR: failed to build: exit status 1

> Task :bootBuildImage FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':bootBuildImage'.
> Builder lifecycle 'creator' failed with status code 145

[nebhale]

Thanks for the nudge. Bellsoft Liberica and all other JVM's that released 15's (for example, Corretto and GraalVM did not) now released with 15.0.0 included. Expect another release next month with 15.0.1 in it.

[JeremyTwiggs]

I know this issue is closed, but I thought I'd add a comment for others who might end up here...

Today we started getting No valid JRE available for BP_JVM_VERSION = 14.*

Switching to either 15.* or just using the default (11.*) got us over this problem.

[benleb]

same problem like @JeremyTwiggs -.-^ Would be cool if we could get 14.* back, at least for a few weeks 😅