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After fresh Ubuntu 18.04 installation and afterwards a netbeans installation, netbeans does not start. netbeans was installed with

sudo apt install netbeans

some other java programms (at least Eclipse) do not start too.

when starting netbeans from commandline the JVM prints folowing WARNINGS:

➜  ~ netbeans

WARNING: An illegal reflective access operation has occurred

WARNING: Illegal reflective access by org.netbeans.ProxyURLStreamHandlerFactory (file:/usr/share/netbeans/platform18/lib/boot.jar) to field java.net.URL.handler

WARNING: Please consider reporting this to the maintainers of org.netbeans.ProxyURLStreamHandlerFactory

WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

WARNING: All illegal access operations will be denied in a future release

➜  ~ 

Ubuntu's repository still has Netbeans 8.1 but JDK 11. So I've downloaded Netbeans 8.2 from Netbeans Website

After downloading Netbeans 8.2, follow these steps:

sudo apt autoremove netbeans

cd Downloads

sudo chmod +x netbeans-8.2-linux.sh

./netbeans-8.2-linux.sh

and follow on screen instructions. Import settings and launch the netbeans from app drawer.

Also if you have any package with name as JDK 8, just remove it. You can find the packages installed by using

sudo apt list --installed

and remove all packages with name as openjdk-8- by using,

sudo apt autoremove <package_name>

For Installation of Netbeans 9.0 see here.

I was able to get it working by installing and setting JDK8 as default.

I followed the instructions on this website:
https://linuxconfig.org/how-to-install-java-on-ubuntu-18-04-bionic-beaver-linux

specifically:

Adding the PPA repository:

sudo add-apt-repository ppa:webupd8team/java

sudo apt update

Install Java 8, and set as default:

sudo apt install oracle-java8-set-default

I was able to install using the netbeans .sh file installed after that

Same problem with me as well after upgrading to Ubuntu 18.04. Netbeans stopped working. I tried many ways changing the configuration. The primary reason for this problem is java dependency. Netbeans is directly dependent on Oracle Java. Ubuntu 18.04 comes with default open jdk11 installed and set as default java. When Netbeans starts it checks for the dependencies and fails due to this. Though in few cases it opens but not all the features working. Sometime only few windows only working. Specially project explorer doesn't work.

To see the errors you can check the log file from the menu->view->IDELog

System Info: 

  Product Version         = NetBeans IDE 8.2 (Build 201609300101) (#5fd841261bf9)

  Operating System        = Linux version 4.15.0-34-generic running on amd64

  Java; VM; Vendor        = 1.8.0_181; Java HotSpot(TM) 64-Bit Server VM 25.181-b13; Oracle Corporation

  Runtime                 = Java(TM) SE Runtime Environment 1.8.0_181-b13

  Java Home               = /usr/lib/jvm/java-8-oracle/jre

  System Locale; Encoding = en_IN (nb); UTF-8

  Home Directory          = /home/mukesh

  Current Directory       = /home/mukesh

  User Directory          = /home/mukesh/.netbeans/8.2

  Cache Directory         = /home/mukesh/.cache/netbeans/8.2

  Installation            = /home/mukesh/netbeans-8.2/...



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Finally what worked for me is.

Finally what worked for me is setting the java_home path in the installed directory of Netbeans. Netbeans 8.2 is installed in HOME directory in general. Sometime it can be different. You can find out using locate command. change path for java_home inside

/home/<Netbean DIR>/etc/netbeans.conf

netbeans_jdkhome="/usr/lib/jvm/java-8-oracle"

Restart the Netbeans and it will work all well.

NOTE: Changing the above in system /etc/netbeans.conf directory will not work.

I was able to solve this by running sudo update-alternatives --config java and then selecting the java-8 option rather than the default java-11. You will need to have the java-8 openjdk package still installed for this to work though.

Remove Java 11 (which is not compatible with Netbeans 8.2 on Ubuntu 18.xx):

sudo apt remove netbeans

sudo apt remove openjdk-11-*

Install Java 8 and Netbeans 8.2 (Netbeans is about 214MB):

sudo apt install openjdk-8-jdk



wget https://download.netbeans.org/netbeans/8.2/final/bundles/netbeans-8.2-linux.sh



sudo sh netbeans-8.2-linux.sh

When it asks about Java Location select /usr/lib/jvm/java-8-openjdk-amd64.

After installation you can access it via

/usr/local/netbeans-8.2/bin/netbeans

if you chose default location.

What solved the problem for me was two things:

1. Setting the jdk to Oracle Java 8 (if installed you can choose it while installing netbeans)


2. Installing netbeans 8.2 instead of the default on Ubuntu which, for me, was 8.1