Add run-java script

java/Dockerfile

@@ -22,7 +22,7 @@ RUN mkdir /m2 /npm && ln -sf /m2/ /root/.m2 && ln -sf /npm/ /root/.npm && \
     curl https://download.java.net/java/early_access/jdk16/23/GPL/openjdk-16-ea+23_linux-x64_bin.tar.gz | bsdtar -xf - -C /usr/lib/jvm && \
     mv /usr/lib/jvm/java-se-9-ri/jdk-9 /usr/lib/jvm/ && rm -rf java-se-9-ri && chmod +x /usr/lib/jvm/jdk-9/bin/*
 
-COPY ./build.sh /usr/bin/
+COPY ./build.sh ./run-java /usr/bin/
 
 VOLUME [ "/build", "/m2", "/npm" ]
 

java/build.sh

@@ -1,19 +1,7 @@
 #!/bin/bash
 set -euo pipefail
 
-for jdk in ${BUILD_JDKS:-java-6-jdk java-7-openjdk java-8-openjdk jdk-9 jdk-10 java-11-openjdk jdk-12 jdk-13 java-14-openjdk jdk-15 jdk-16}
+for jdk in ${BUILD_JDKS:-6 7 8 9 10 11 12 13 14 15 16}
 do
-    sudo archlinux-java set "$jdk"
-
-    export JAVA_VERSION="$(echo "$jdk" | grep -Eo '[0-9]+')"
-    export JAVA_HOME="/usr/lib/jvm/$jdk"
-
-    export M2_HOME="/opt/maven"
-
-    # maven 3.2.5 is the latest version supported by 6
-    [ $JAVA_VERSION -eq 6 ] && export M2_HOME="/opt/apache-maven-3.2.5"
-
-    export PATH="$JAVA_HOME/bin:$M2_HOME/bin:$PATH"
-    echo "building with JAVA_VERSION='$JAVA_VERSION' JAVA_HOME='$JAVA_HOME'"
-    "$@"
+    run-java "$jdk" "$@"
 done

java/run-java

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# first arg can be a numeric version, or a folder in /usr/lib/jvm/
+jdk="$1"
+shift
+
+JAVA_HOME="/usr/lib/jvm/$jdk"
+
+M2_HOME="/opt/maven"
+
+if [ ! -d "$JAVA_HOME" ]
+then
+    # it's probably a number
+    JAVA_VERSION="$jdk"
+
+    case "$JAVA_VERSION" in
+        6)
+            jdk=java-6-jdk
+            ;;
+        7)
+            jdk=java-7-openjdk
+            ;;
+        8)
+            jdk=java-8-openjdk
+            ;;
+        9)
+            jdk=jdk-9
+            ;;
+        10)
+            jdk=jdk-10
+            ;;
+        11)
+            jdk=java-11-openjdk
+            ;;
+        12)
+            jdk=jdk-12
+            ;;
+        13)
+            jdk=jdk-13
+            ;;
+        14)
+            jdk=java-14-openjdk
+            ;;
+        15)
+            jdk=jdk-15
+            ;;
+        16)
+            jdk=jdk-16
+            ;;
+        *)
+            echo "run-java: unknown jdk: $jdk"
+            exit 1
+            ;;
+    esac
+
+    JAVA_HOME="/usr/lib/jvm/$jdk"
+else
+    # it's a folder
+    JAVA_VERSION="$(echo "$jdk" | grep -Eo '[0-9]+')"
+fi
+
+# maven 3.2.5 is the latest version supported by 6
+[ $JAVA_VERSION -eq 6 ] && export M2_HOME="/opt/apache-maven-3.2.5"
+
+JAVA_VERSION=$JAVA_VERSION M2_HOME="$M2_HOME" JAVA_HOME="$JAVA_HOME" PATH="$JAVA_HOME/bin:$M2_HOME/bin:$PATH" exec "$@"