Ubuntu 20.10: Programming Tools

skp Eclipse, Java, PHP, Ubuntu 20.10, Virtual Box, Visual Studio Code

This is my last post for my Ubuntu 20.10 install. Below is my notes for installing all of the programming-related apps and tools that I like to have available.

Virtualbox

I installed virtualbox just from the respoitory:

sudo apt install virtualbox

I learned that you can install the extension pack on the version from the repository. That doesn’t really matter. But, it didn’t do what I wanted so I decided to just uninstall it. You can do that by going to File > Preferences. Then, under Extensions, you can remove it.

I setup the network in File > Host Network Manager. I created vboxnet0.

Finally, I double clicked on all of the .vbox files in my file system to add all the machines.

Tools

These are the tools I like:

  • vim: an updated version of the vi text editor
  • vim-gtk: a GUI version of the vi editor
  • git-cola: a GUI interface to git version control (also installs git itself) because I don’t use git enough to remember the commands
  • meld: text compare tool
  • openjdk: Java development kit
  • openjfx: JFX java development that I use in one of my projects (see note below)
sudo apt install \
       vim \
       vim-gtk3 \
       git-cola \
       meld \
       openjdk-8-jdk \
       openjdk-13-jdk \
       openjdk-15-jdk \
       openjfx

Note: I tried openjdk 15 intially, but I had issues with Flutter. (I never did really figure out that that was the problem or not.) I also had issues with the OpenJFX. It installed into /usr/share/openjfx and was missing the Ant jar file. I never did find the current Ant for openjfx.

For my vim config, I have it saving the temp files in a specific directory rather than where the file is that I’m editing. So, that directory needs to be created:

mkdir ~/.vimtmp

To configure git, I ran the following two commands:

git config --global user.name "my name"
git config --global user.email my.email@email.com

Visual Studio Code

I installed Visual Studio Code from the Microsoft Website. I just downloaded the deb file.

sudo apt install ./Downloads/code_1.50.1-1602600906_amd64.deb

After installing, I opened Code and used Ctrl+P to install these extensions:

  • ext install johnpapa.angular-essentials
  • ext install humao.rest-client
  • ext install raagh.angular-karma-test-explorer
  • ext install hbenl.vscode-jasmine-test-adapter
  • ext install dart-code.flutter

Node JS

I installed Node with these commands. I also added the tools that I use with angular.

sudo apt-get install nodejs 
sudo apt-get install npm 
sudo npm install npm@latest -g
sudo npm install -g gulp 
sudo npm install -g grunt 
sudo npm link @angular/cli

Eclipse

I use Eclipse for Java development. I just downloaded the installer from the website. I used “Extract Here” in nautilus and double clicked on the installer (eclipse-inst).

Going through the installer, I …

  • picked Eclipse IDE for Java Developers
  • changed the install path to: /home/skp/bin/eclipse/java-2020-09

I installed e(fx)clipse using the market place. I visited the website in my browser and then drug the install button to my workspace.

Before, I installed a bunch of stuff that I don’t normally use. This time, I just installed a few things from the marketplace:

For Java FX, I use the Gluon Scene Developer. I downloaded that from the website. I downloaded the deb version for Java FX 11. Then, I installed it with:

sudo apt install ./Downloads/scenebuilder-11.0.0.deb

Open JFX

I have one App that I have been playing with that uses Open JFX. So, I installed it to work with Eclipse. I keep finding it more and more difficult to install using the regular Ubuntu packages.

The OpenJFX package installs into /usr/share/openjfx/lib. I also found some jars installed in /usr/share/java. It came from the libopenjfx-java package.

$ dpkg -S /usr/share/java/javafx-base.jar 
libopenjfx-java: /usr/share/java/javafx-base.jar

So, instead of using the packages, I downloaded the “JavaFX Linux SDK” from Gluon’s website. Then, I extracted it into my Eclipse folder.

unzip ~/Downloads/openjfx-11.0.2_linux-x64_bin-sdk.zip
mv javafx-sdk-11.0.2/ ~/bin/eclipse/

In Eclipse, I opened preferences (Window > Preferences). I set the Java FX Path.

Also, I went to the Build Path (Java > Build Path > User Libraries). I added a new one called JavaFX.

Then, I added all of the Jars in the installation folder:

Flutter

This time the flutter instructions suggest using snap. So, I just went that route to install it.\

sudo snap install flutter --classic

Note: this installs flutter in the directory /home/skp/snap/flutter/common/flutter. You’ll need that later for Android Studio.

When I ran flutter doctor, it downloaded the flutter linux stable tar ball. That took a little while, but it seemed to install fine by itself.

I downloaded Android Studio from the website. While it was downloading, I installed the following prerequisites:

sudo apt-get install libc6:i386 libncurses5:i386 libstdc++6:i386 lib32z1 libbz2-1.0:i386
udo apt-get install clang cmake ninja-build pkg-config libgtk-3-dev

I extracted the code to my bin directory:

mkdir ~/bin/studio
tar -xzvf ~/Downloads/android-studio-ide-201.6858069-linux.tar.gz -C ~/bin/studio

Flutter doctor wants to be able to see the files, so I added the path to the end of my ~/.bashrc with these lines:

#  for Android Studio install
export PATH="$PATH:$HOME/bin/studio/android-studio/bin"
export STUDIO_JDK=/usr/lib/jvm/java-8-openjdk-amd64/

Then, I launched the studio.sh script in the bin directory. To make it easier to launch, I used the Menu Editor (MenuLibre) to add a launcher. Both the icon and the shell script are in the bin directory of what I extracted.

I followed these instructions to enable VM acceleration. Note the instructions say to use libvirt-bin, but as best I can tell libvirt-daemon is the correct one in this case. I also don’t think that I need ubuntu-vm-builder and ia32-libs-multiarch.

sudo apt-get install cpu-checker
egrep -c '(vmx|svm)' /proc/cpuinfo
#  result: 24
kvm-ok
#  result:
#INFO: /dev/kvm exists
#KVM acceleration can be used
sudo apt-get install qemu-kvm libvirt-daemon bridge-utils

To clear up the “android license status unknown”, I ran:

flutter doctor --android-licenses

I got this crazy error when I did that:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
	at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
	at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
	at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
	at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
	at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 5 more

I found a solution that suggested installing the command-line tools. In Android Studio, I opened File > Settings. Then, I went to Appearance & Behavoir > System Settings > Android SDK. I installed the “Android SDK Command-line Tools (latest)” on the SDK Tools tab.

After that, the flutter doctor license command worked fine.

Also in the settings, I went to the Languages & Frameworks > Flutter and set the flutter path to /home/skp/snap/flutter/common/flutter

Note: At one point, it complained about my dart SDK path not being configured. That is located insde the flutter folder: /home/skp/snap/flutter/common/flutter/bin/cache/dart-sdk

I still had a problem with it not building my flutter project correctly. I was getting this error:

FAILURE: Build failed with an exception.                                
                                                                        
* What went wrong:                                                      
Could not initialize class org.codehaus.groovy.runtime.InvokerHelper

I remembered that I had been working on the beta channel previously. So, I tried going to the beta channel with these commands:

 flutter channel beta
 flutter upgrade

While these commands did some thorough building and resetting things, I’m not sure they helped in the end.

cd android
./gradlew app:assembleRelease
cd ..
flutter pub cache repair
flutter pub get
flutter clean
flutter build apk

This article helped. I ran these two commands and got it to build:

flutter build apk --profile
flutter build apk --release

MySQL / PHP

I have a project that uses both MySQL and PHP. I just want to develop in it as a hobby but not run it full time. So, I installed it like this:

sudo apt install mariadb-server-10.3
sudo apt install php7.4
sudo apt install php-mysql
sudo apt install composer

(Note: I probably should have done php7.4-fpm instead.)

To keep it from running all of the time, I ran this:

sudo systemctl disable mysql

To get the actual database, I had to run this command on my server.

sudo mysqldump -p matthew > matthewbackup.txt

I loaded the backup script with these commands:

cd ~/Downloads
sed -i '' 's/utf8mb4_0900_ai_ci/utf8mb4_unicode_ci/g' matthewbackup.txt
sudo mysql
create database matthew;
use matthew;
source matthewbackup.txt
\q

So, after all this, I found that Apache got installed somehow. To found how, I installed aptitude and tried to use the why command to figure out.

$ sudo apt install aptitude
$ aptitude why apache2 --show-summary
Packages requiring apache2:
  php7.4

I fixed it with:

sudo apt remove apache2
sudo apt autoremove

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