Java 1.7.0 virtual machine could not be found
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode) Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13) (you can also specify the version directly, i.e. (make the newest version of Java your default:) $ module add java (find out what optional version of java is available.) OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode) OpenJDK Runtime Environment (build 1.8.0_181-b13) You can call its binaries directly from its installation directory:īut if you'd rather use it by default you can use the module system to apply it as your default JDK/JRE: (before.) Java 10 and 11 are installed on most DICE machines but because it differs in a few ways from older versions it is not used automatically.
Contact Computing support if you have different requirements. Things are simpler for DICE Ubuntu, we have no plans to use module to change defaults, just specify your favourite Java directly. This section covers the older SL7 version of DICE
# add Java 11 to your shell display an error if it's not available: If you'd like to set the default only for the duration of a script, you could also do so with $PATH at the top of the script itself: You could hide the error on machines without Java 11 by, for example, appending |& grep -v 'Unable to locate a modulefile' to the module invocation. # add Java 11 to your shell displays a harmless error if it's not available: Or, on SL7, if you're using module: within. this will not apply to scripts you've written, with certain exceptions). Remembering that bash aliases only apply to interactive shells (i.e. It can however be confusing to have this in conflict with the default version by PATH so it's recommended that you only set this when required, or tie them together somehow, e.g. This is not set by default, but users can add this to their ~/.brc to influence certain pieces of software. This is most likely to affect the operation of other programs such as IDEs.
JAVA 1.7.0 VIRTUAL MACHINE COULD NOT BE FOUND FULL
Prepend the /bin JDK subdirectory to your PATH if you are likely to need frequent access to the full set of JVM tools (e.g.java or javac) whose versions you wish to change. Create a symbolic link in your ~/bin/ directory for each of the executables (e.g.Set aliases in your bash config, if you're mainly interested in interactive use (this is least likely to affect the behaviour of IDEs, for example).There are several ways to override the default version as provided by DICE, for example: Fortunately this can be inferred from where it's installed, using with the following, e.g.: $ which javac | xargs readlink -f Unfortunately the latter doesn't tell you the distribution of javac, only its version. (any other result but /usr/bin/java suggests you have already overridden the machine's default version). You can check if this is the version controlled by alternatives by running: $ which java OpenJDK 64-Bit Server VM (build 25.191-b12, mixed mode) OpenJDK Runtime Environment (build 1.8.0_191-b12) You can discover the default version by PATH simply by executing: $ java -version Note that java (provided by the JRE) and javac/javadoc/etc (provided by the JDK) can therefore be different! Your own environment including the PATH variable can override what's been set by alternatives, however. The default java binaries are normally specified by the "alternatives" system, defined by linking /usr/bin/ to each of the binaries in a given JDK directory. There are different ways to do this, depending on the way your JVM is invoked. However, differences between distributions are nowadays negligible for most users, and specialist requirements mean it's better for users to specify defaults individually. The default Java version on DICE is shown above but it is subject to change over time (though typically only between semesters). Here's a summary of the versions to be found on DICE: DICE Ubuntu Focal We support multiple versions and distribution of Java (both the JVM runtime ("JRE") and development tools "JDK").