You have set the default to what you want, and you can control the applications you are using to use that setting (in fact you can do it on an application by application basis without changing the system default at all) - but not everything is under your control, at least not without some serious expertise and mucking around. 3 Can not install openjdk-8-jre-headless on Ubuntu 14.04 LTS. Now, when i checked java on firefox using this link, it showed java plugin is not working on browser. I am trying to install OpenJDK 14 in Ubuntu 18.04 using tar.gz, using following steps and referring to this answer. (The package is clearly available from the repositories, but a dependency problem prevents its installation. Using update-alternatives, I have made java 8 as the default one. What happens if you run apt-get install ca-certificates-java Usually, that provides more information why the package cannot be installed. Leave it in place for those modules that expect it, because it is the default. I am using ubuntu 14.10 and i installed jdk8 via apt-get install openjdk-8-jdk:i386. Removing it may cause some serious problems. There are any number of modules and applications that may be expecting OpenJDK to be there and are configured to use it - it's the default Java that comes with Ubuntu. I would definitely not recommend removing entirely the OpenJDK. Install openjdk using apt, enter this command in your terminal sudo apt-get install openjdk-7-jdk Install Java provided by Oracle. On Mac and Linux this is fairly easy, but setting up Windows is more difficult. Once you've done that, unless there are configuration settings directing otherwise for particular applications (quite common), the Java version you've chosen will be your global system default. While the OpenJFX build system was designed to remove as many build hurdles as possible, it is often necessary to build native code and have the requisite compilers and toolchains installed. You will get a list that looks something like this:Īs per the instructions at the prompt, enter the number corresponding to the version you want to be your system default Java implementation. In a terminal session, run : sudo update-alternatives -config java See How can I install Sun/Oracle's proprietary Java JDK 6/7/8 or JRE? (and others) for details.
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