On 2 October 2014 18:41, Maxwell Anselm <silverhammermba@xxxxxxxxx> wrote: > I'm working on a PKGBUILD for a Java app that must be built and run using > Java 8, but I couldn't find any guidelines on best practices for such a > situation. > > The easy part is including 'java-environment=8' and 'java-runtime=8' in > makedepends and depends respectively, but how to ensure the right version > is set as default when building and running (rather than spitting out the > opaque Java errors you get when using the wrong version)? > > Right now at the start of build() I have > > echo "Checking that default Java is version 8..." > > java -version 2>&1 | grep 'version "1.8' > > > Which seems reasonable since building is infrequent. But what about for the > shell script that starts the app? I could put a similar check there, but > that seems like it would be really annoying for people who have multiple > Java versions installed. Could there be a good way of letting my app always > use Java 8, even if some other version is set as the default? > > Thanks, > Max Hello, > The easy part is including 'java-environment=8' and 'java-runtime=8' in > makedepends and depends respectively Yes. Also note existence of "java-runtime-headless" in case your application does not require graphical stuff (if it does not have a GUI). > how to ensure the right version is set as default when building If building in a chroot (using scripts in package "devtools") and as you added a makedependency on "java-environment=8" then jdk8-opendjk and its dependencies will be the only ones installed. Thus your application will automatically be built with it. If building on a box where multiple JVM can be installed: build scripts for Java apps usually provide a "--with-jdk=<PATH>" or "--java-home=<PATH>" (or similar) to force the JVM to use to build. If true for the app you are trying to build then you could use path "/usr/lib/jvm/java-8-openjdk/" Same applies when running the application: it usually involves a script that checks where the JVM is located that usually takes the same kind of parameter to "force" the JVM. What is the name/URL of this app?
