---
title: Cloud FoundryのJava BuildpackでJava 11を使う
tags: ["Cloud Foundry", "Java", "Java SE 11", "Docker"]
categories: ["Dev", "PaaS", "CloudFoundry"]
date: 2018-10-04T05:42:52Z
updated: 2018-10-04T05:42:52Z
---

[Java Buildpack v4.16](https://github.com/cloudfoundry/java-buildpack/releases/tag/v4.16)でJava 11がサポートされたので使ってみます。

当面はJava8がデフォルトで使用されますが、
JREのバージョンは環境変数`JBP_CONFIG_OPEN_JDK_JRE`で指定可能です。

``` yml
applications:
- name: hello-java11
  buildpacks: # cf buildpacksでbuildpack一覧を確認してjava_buildpackのバージョンが4.16以上であれば設定不要
  - https://github.com/cloudfoundry/java-buildpack.git#v4.16
  path: target/demo-java11-0.0.1-SNAPSHOT.jar
  memory: 1g
  env:
    JBP_CONFIG_OPEN_JDK_JRE: '{ jre: { version: 11.+}}'
```

これで`cf push`すれば、Staging中に次のようなログが出力されます。11.0.0_28が使われていることがわかります。

```
   2018-10-04T14:31:43.11+0900 [STG/0] OUT -----> Java Buildpack v4.16 | https://github.com/cloudfoundry/java-buildpack.git#3552cb1
   2018-10-04T14:31:43.30+0900 [STG/0] OUT -----> Downloading Jvmkill Agent 1.16.0_RELEASE from https://java-buildpack.cloudfoundry.org/jvmkill/trusty/x86_64/jvmkill-1.16.0_RELEASE.so (found in cache)
   2018-10-04T14:31:43.38+0900 [STG/0] OUT -----> Downloading Open Jdk JRE 11.0.0_28 from https://java-buildpack.cloudfoundry.org/openjdk/trusty/x86_64/openjdk-11.0.0_28.tar.gz (found in cache)
   2018-10-04T14:31:44.47+0900 [STG/0] OUT        Expanding Open Jdk JRE to .java-buildpack/open_jdk_jre (1.0s)
   2018-10-04T14:31:44.47+0900 [STG/0] OUT        JVM DNS caching disabled in lieu of BOSH DNS caching
   2018-10-04T14:31:44.50+0900 [STG/0] OUT -----> Downloading Open JDK Like Memory Calculator 3.13.0_RELEASE from https://java-buildpack.cloudfoundry.org/memory-calculator/trusty/x86_64/memory-calculator-3.13.0_RELEASE.tar.gz (found in cache)
   2018-10-04T14:31:44.76+0900 [STG/0] OUT        Loaded Classes: 18647, Threads: 250
   2018-10-04T14:31:44.80+0900 [STG/0] OUT -----> Downloading Client Certificate Mapper 1.8.0_RELEASE from https://java-buildpack.cloudfoundry.org/client-certificate-mapper/client-certificate-mapper-1.8.0_RELEASE.jar (found in cache)
   2018-10-04T14:31:44.83+0900 [STG/0] OUT -----> Downloading Container Security Provider 1.16.0_RELEASE from https://java-buildpack.cloudfoundry.org/container-security-provider/container-security-provider-1.16.0_RELEASE.jar (found in cache)
   2018-10-04T14:31:44.85+0900 [STG/0] OUT -----> Downloading Spring Auto Reconfiguration 2.5.0_RELEASE from https://java-buildpack.cloudfoundry.org/auto-reconfiguration/auto-reconfiguration-2.5.0_RELEASE.jar (found in cache)
```

ちなみに、Dockerを使えば、開発端末にJDK 11がインストールされていない状態でJDK 11を使ってアプリケーションをビルドできます。

```
docker run --rm \
           -v ~/.m2:/root/.m2 \
           -v "$PWD":/usr/src \
           -w /usr/src \
           maven:3-jdk-11 \
           mvn clean package
```

サンプルアプリは[こちら](https://github.com/making/demo-java11)です。

どんどんJava 11を使って行きましょう。