Category: Linux

Install Oracle JDK 10.0.1 on Linux

✎ Last updated on 2018-05-15 at 12:30 EDT

[Updated for jdk-10.0.1]
This is for 64-bit installation.

  1. Download JDK from Oracle site
    http://www.oracle.com/technetwork/java/javase/downloads
    The installation file I use is jdk-10.0.1_linux-x64_bin.tar.gz.
  2. Change directory to install the JDK code in /opt 
    cd /opt
  3. extract the JDK files 
    sudo tar -xvzf <location of downloaded JDK>/jdk-10.0.1_linux-x64_bin.tar.gz

    This will put the JDK into the newly created directory named jdk-10.0.1

  4. Update environment variables to point to the newly installed JDK by editing the /etc/environment file. 
    sudo nano /etc/environment

    Add the JAVA_HOME variable, and add JDK bin to the PATH variable.

    JAVA_HOME="/opt/jdk-10.0.1"
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/jdk-10.0.1/bin"
  5. Refresh the environment variable. 
    source /etc/environment
  6. Verify that the updated environment variables are in place and the path to the JDK is valid 
    $ echo $JAVA_HOME
/opt/jdk-10.0.1
$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/jdk-10.0.1/bin
  7. Update Java alternative list. You want to set a higher priority for the new JDK. On my system this is the result when I query the alternatives: 
    $ update-alternatives --verbose --query java
Name: java
Link: /usr/bin/java
Slaves:
 java.1.gz /usr/share/man/man1/java.1.gz
Status: auto
Best: /usr/lib/jvm/java-9-openjdk-amd64/bin/java
Value: /usr/lib/jvm/java-9-openjdk-amd64/bin/java

Alternative: /usr/lib/jvm/java-9-openjdk-amd64/bin/java
Priority: 1091
Slaves:
 java.1.gz /usr/lib/jvm/java-9-openjdk-amd64/man/man1/java.1.gz

    So, let’s make the new JDK our default…

    sudo update-alternatives --install /usr/bin/java java /opt/jdk-10.0.1/bin/java 10001

    The response is:

    update-alternatives: using /opt/jdk-10.0.1/bin/java to provide /usr/bin/java (java) in auto mode.

    Now, when you type java -version, you will see

    java version "1.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 1.0.0.1+10)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)
  8. Likewise, set the new Java compiler as default with

    $ sudo update-alternatives --install /usr/bin/javac javac /opt/jdk-10.0.1/bin/javac 10001
update-alternatives: using /opt/jdk-10.0.1/bin/java to provide /usr/bin/javac (javac) in auto mode
$ javac -version
java version "10.0.1" 2018-04-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode)
  9. If you wish, you can remove the link to the older java alternative 
    $ sudo update-alternatives --verbose --remove java /usr/lib/jvm/java-9-openjdk-amd64/bin/java
update-alternatives: discarding obsolete slave link java.1.gz (/usr/share/man/man1/java.1.gz)
$ update-alternatives --verbose --query java
Name: java
Link: /usr/bin/java
Status: auto
Best: /opt/jdk-10.0.1/bin/java
Value: /opt/jdk-10.0.1/bin/java

Alternative: /opt/jdk-10.0.1/bin/java
Priority: 10001
  10. In the similar way, remove the old javac alternative link. 
    $ update-alternatives --verbose --query javac
Name: javac
Link: /usr/bin/javac
Slaves:
 javac.1.gz /usr/share/man/man1/javac.1.gz
Status: auto
Best: /opt/jdk-10.0.1/bin/java
Value: /opt/jdk-10.0.1/bin/java

Alternative: /opt/jdk-10.0.1/bin/java
Priority: 10001
Slaves:

Alternative: /usr/lib/jvm/java-9-openjdk-amd64/bin/javac
Priority: 1091
Slaves:
 javac.1.gz /usr/lib/jvm/java-9-openjdk-amd64/man/man1/javac.1.gz
$ sudo update-alternatives --remove javac /usr/lib/jvm/java-9-openjdk-amd64/bin/javac

Changing Display Font in elementary OS’s pantheon Terminal

Edit the font property in the org.pantheon.terminal.settings schema. For example:

gsettings set org.pantheon.terminal.settings font 'DejaVu Sans Mono'

Then close and reopen the terminal for the change to take effect.

You can find the correct font name with the following command:

fc-list | cut -f2 -d: | sort -u

Changing Display font in XTerm and UXTerm

Edit .Xresources to set the desire True Type font for UXTerm and XTerm.

XTerm*renderFont: true
XTerm*faceName: DejaVu Sans Mono
XTerm*faceSize: 10

UXTerm*renderFont: true
UXTerm*faceName: DejaVu Sans Mono
UXTerm*faceSize: 10

Use xrdb to merge your setting into the X server resource database.

xrdb -merge ~/.Xresources

Use xrdb -q to query the resulting resource setting:

$ xrdb -q
*customization: -color
UXTerm*faceName:        DejaVu Sans Mono
UXTerm*faceSize:        10
UXTerm*renderFont:      true
XTerm*faceName: DejaVu Sans Mono
XTerm*faceSize: 10
XTerm*renderFont:       true
Xcursor.size:   18
Xcursor.theme:  DMZ-White
Xcursor.theme_core:     true

You can find the correct font name with the following command:

fc-list | cut -f2 -d: | sort -u

Set Up Proxy Environment Variables

Add the following one-liner at the end of .bashrc script:

export {http,https,ftp}_proxy='http://<user>:<password>@<proxy-server>:<port>'

For example: export {http,https,ftp}_proxy='http://10.0.2.2:3128'

For this to take effect, restart terminal or run source with . ~/.bashrc

After that, check for the presence of the environmental variables with printenv | grep proxy

yields the following output:

http_proxy=http://10.0.2.2:3128
ftp_proxy=http://10.0.2.2:3128
https_proxy=http://10.0.2.2:3128

GNU Emacs error on elementary OS

Problem: GNU Emacs-24 crashes at startup on elementary OS. This is due to incompatibility between the graphical toolkit used in the Emacs package.

X protocol error: BadMatch (invalid parameter attributes) on protocol request 139
When compiled with GTK, Emacs cannot recover from X disconnects.
This is a GTK bug: https://bugzilla.gnome.org/show_bug.cgi?id=85715
For details, see etc/PROBLEMS.
Fatal error 6: Aborted
Backtrace:
emacs[0x4f74cb]
emacs[0x4dcf3e]
emacs[0x4f7513]
emacs[0x4b219b]
emacs[0x4b420c]
emacs[0x4b426d]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XError+0x12b)[0x7f78f57b654b]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3b5e7)[0x7f78f57b35e7]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3b695)[0x7f78f57b3695]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XReply+0x1e8)[0x7f78f57b4578]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x325e0)[0x7f78f57aa5e0]
...
Aborted (core dumped)

Solution: Setting the environment variable XLIB_SKIP_ARGB_VISUALS=1 allows Emacs to start. So use this command line to start Emacs in the terminal:

XLIB_SKIP_ARGB_VISUALS=1 emacs

Or better yet, create a launcher in ~/.local/share/applications by copying the emacs24.desktop file, and change the Exec line to

Exec=/usr/bin/env XLIB_SKIP_ARGB_VISUALS=1 /usr/bin/emacs24 %F

See [Adding Desktop Entries to System] for more information on desktop files.