This post will show how to set up Oracle JDK 8 on pcDuino.

That lesson we discuss about “How to Install JDK 8 on pcDuino ” http://learn.linksprite.com/pcduino/java/how-to-install-jdk-8-on-pcduino/

But We want  to Set default java and javac to the new installed jdk8.

How ?

Let’s make it happen : )

ubuntu@ubuntu:~$ sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0/bin/java 1
ubuntu@ubuntu:~$ sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0/bin/java 1
ubuntu@ubuntu:~$ sudo update-alternatives --config javac
There is only one alternative in link group javac: /opt/jdk1.8.0/bin/java
Nothing to configure.
ubuntu@ubuntu:~$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-6-openjdk-armhf/jre/bin/java   1057      auto mode
* 1            /opt/jdk1.8.0/bin/java                           1         manual mode
  2            /usr/lib/jvm/java-6-openjdk-armhf/jre/bin/java   1057      manual mode

Press enter to keep the current choice[*], or type selection number: 1
ubuntu@ubuntu:~$ java -version
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode)
ubuntu@ubuntu:~$ javac -version
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) Client VM (build 25.0-b70, mixed mode)
ubuntu@ubuntu:~$ java
Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)
where options include:
    -d32  use a 32-bit data model if available
    -d64  use a 64-bit data model if available
    -client  to select the "client" VM
    -server  to select the "server" VM
    -minimal  to select the "minimal" VM
                  The default VM is client.

    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A : separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose:[class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -no-jre-restrict-search
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:<packagename>...|:<classname>]
    -enableassertions[:<packagename>...|:<classname>]
                  enable assertions with specified granularity
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions with specified granularity
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:<libname>[=<options>]
                  load native agent library <libname>, e.g. -agentlib:hprof
                  see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:<pathname>[=<options>]
                  load native agent library by full pathname
    -javaagent:<jarpath>[=<options>]
                  load Java programming language agent, see java.lang.instrument
    -splash:<imagepath>
                  show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.

It really have Fun pcDuino 🙂