[ci] Download openjdk8 from adoptopenjdk.net

Author: adangel

.travis.yml

@@ -2,14 +2,15 @@ os: linux
 dist: bionic
 
 language: java
-jdk: openjdk8
 
 services:
   - xvfb
 
 before_install:
   - bash .travis/setup-secrets.sh
   - bash .travis/configure-maven.sh
+  - bash .travis/install-openjdk.sh
+  - source ${HOME}/java.env
 install: true
 before_script: true
 script: "source .travis/build.sh"
@@ -23,6 +24,7 @@ notifications:
 cache:
   directories:
   - "$HOME/.m2"
+  - "$HOME/.cache"
 
 env:
   global:

.travis/install-openjdk.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+set -e
+
+source .travis/logger.sh
+
+DOWNLOAD_URL="https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u232-b09/OpenJDK8U-jdk_x64_linux_hotspot_8u232b09.tar.gz"
+OPENJDK_ARCHIVE=$(basename $DOWNLOAD_URL)
+
+LOCAL_DIR=${HOME}/.cache/openjdk
+TARGET_DIR=${HOME}/openjdk${OPENJDK_MAJOR}
+
+mkdir -p ${LOCAL_DIR}
+mkdir -p ${TARGET_DIR}
+if [ ! -e ${LOCAL_DIR}/${OPENJDK_ARCHIVE} ]; then
+    log_info "Downloading from ${DOWNLOAD_URL} to ${LOCAL_DIR}"
+    wget --directory-prefix ${LOCAL_DIR} --timestamping --continue ${DOWNLOAD_URL}
+else
+    log_info "Skipped download, file ${LOCAL_DIR}/${OPENJDK_ARCHIVE} already exists"
+fi
+
+log_info "Extracting to ${TARGET_DIR}"
+tar --extract --file ${LOCAL_DIR}/${OPENJDK_ARCHIVE} -C ${TARGET_DIR} --strip-components=1
+
+cat > ${HOME}/java.env <<EOF
+export JAVA_HOME="${TARGET_DIR}"
+export PATH="${TARGET_DIR}/bin:${PATH}"
+java -version
+EOF
+
+log_info "OpenJDK can be used via ${HOME}/java.env"
+cat ${HOME}/java.env
+source ${HOME}/java.env