Develop Reference

Using the correct JDK or changing default in Netbeans on Linux OS

Disclaimer: I am new to Java, new to Linux, and new to Netbeans - apologies for any over/under explanation - please ask and I will add/remove info.
I have a model written in Java in Netbeans 8.2 that has been successfully running in NetBeans 8.2 on Mac OS. This version of NetBeans was downloaded with JDK8u171 (JDK/Java package).
All components of the model have successfully transferred through FTP (filezilla) to a remote Linux machine.
The Linux machine has a copy of Netbeans 8.2 and has java/1.8.0-oracle (and 1.6.0 and 1.7.0), and has java/1.8.0-openjdk (similarly, 1.6.0 and 1.7.0 also).
I am assuming that 1.8.0-oracle is the equivalent of JDK8u171 but I may well be wrong.
When I load netbeans using
module load java/1.8.0-oracle
module load netbeans
netbeans
The program opens (via remote desktop - x2goclient), and I can search for the project and open it.
Once open, I see:
'myprojectitle (broken)' in the project window on the left of the NetBeans GUI
right click -> resolve problems
...opens a screen saying
'The JDK is missing and is required to run some NetBeans modules Please use the --jdkhome command line option to specify a JDK installation or see http://wiki.netbeans.org/FaqRunningOnJre for more information.'
Does this mean I am using the wrong jdk/java package?
Or is the jdk package configured incorrectly in Netbeans, if so how can I reconfigure?
Any help would be greatly appreciated.

The solution to this was found at
The JDK is missing and is required to run some NetBeans modules
Whereby, java/1.8.0_171 needed to be installed and then netbeans needed to be opened as follows:
netbeans --jdkhome /path/java/1.8.0_171
Apologies for a repeat, but hopefully this answer can either redirect or offer a solution

NetBeans 8.2 create not project

I am sure it is simple problem, but I am new to Java and PHP, I want to learn Java, I bought a book, I have also a couple of books as PDF from internet, at the Beginning of the book there is always intructions, how you can install for example NetBeans to start programming. I have installed jdk 8 and NetBeans 8.2.
The problem is, when I start NetBeans, the Buttons for creating new Project not function and is not reacting on my click. I have installed all plugins. I have searched the internet. I have found, that I should click create new Project, I will get a dialogue, then I should choose the desired project. But it shows nothing when I click that button, it simply does not react. Please help me.

It might have been caused by JDK 9. You could have changed the JDK 9 to previous version and it would have worked.
For that you would have to go to:
\NetBeans 8.2\etc
Then you can edit: netbeans.conf . Just change the directory for JDK from 9 to previous version if it is installed. (or install JDK 8 and then do the same process)

I have uninstalled the NetBeans 8.2, which I downloaded it alone from NetBeans website, after that I have downloaded it as a complete package together with Java SDK from Java website, now it functions wonderful

Netbeans 8.2 is bundled with Oracle JDK 8. Just download the installer for your platform and install it. I have tested the installer with Windows 10 and it works like a charm.

How to install an old version of JDK in windows 7?

I already have some version installed on the machine, 1.7 and 1.6.
Now I have the need to install version 1.5, but when I try to install an error occurs, speaking to uninstall the versions that I have the Java (JDK).
I have no chance because I have other applications using these versions, is there any possibility to do this without uninstalling these versions I already have ?
Thank in advance !

Bypassing the installer is bit of work, but doable. How to extract Java from the EXE installer is described in this answer: https://stackoverflow.com/a/6571736/73652

The JDK is a package of tools for developing Java-based software.
Check your system architecture in the control panel, i.e. 32 or 64-bit.
Click on C → program folder → java folder.
If there is no JDK folder present, then follow the below steps:
Search in Google JDK download.
Scroll to bottom, and check for the system architecture of your system.
Click the download link and wait till the download is finished.
In downloads click on show in folder.
Click on the JDK icon and click on next until the setup process is completed.
Please find this video along with steps for JDK Install.

Can't get Eclipse to run with Java FX

Alright so basically, I'm trying to run Eclipse with JavaFX, but then it gives me this error:
You are not running your eclipse instance with Java7 or Java8. The JavaFX tooling is disabled because of this.Make Java7/8 the default system java or adjust your eclipse.ini to pass -vm pointing to your Java7/8 install.
In case you want to turn off this check open your preferences and go to General > Startup and Shutdown and uncheck 'JavaFX Tooling Java Check'
Now I know it isn't pointing to the right SDK, but I have no idea how to change it, since I'm kind of new to this this stuff. I've already downloaded JDK 7.40 as well. I'm also using Ubuntu on a virtual machine, if that even matters anyway. Can anyone help me, I'd appreciate it.

Pre-requirements:
Install Java™ 8.
Install Kepler SR2 (4.3.2) .
The Kepler is still not supporting Java8. What to do?
Open Eclipse
Help > Install New Software…
Enter the following URL into the ‘Work with’ field:
http://download.eclipse.org/eclipse/updates/4.3-P-builds/
Press ‘Enter’
Select category ‘Eclipse Java 8 Support (for Kepler SR2)’
Click ‘Next’
Click ‘Next’
Accept Licence Agreement
Click ‘Finish’
Now jre8 is correctly located.
Now configure JavaFx
Open Eclipse
Help > Install New Software…
Enter the following URL into the ‘Work with’ field:
http://download.eclipse.org/efxclipse/updates-released/0.9.0/site
Press ‘Enter’
Select category ‘Eclipse Java 8 Support (for Kepler SR2)’
Click ‘Next’
Click ‘Next’
Accept Licence Agreement
Click ‘Finish’

It looks like the default java on your system is not java7. What do you get when opening a shell and execute java -version? Solution is to:
A) make java7 the default java
B) start eclipse with -vm

Apparently, you have installed 32bit Eclipse and 64bit JRE/JDK on a 64bit OS. Please use 64bit Eclipse and the problem will be solved. Please make sure JAVA_HOME And JRE_HOME is present in environment variables.

I had the same issue. I tried re-installing Eclipse, but it wouldn't work. I had to completely remove the project and delete all the project files. After that, I re-started eclipse and created the project again. However, this time I made sure the project path included the Java FX library as shown in the screen shot.
Java Build Path
I did this while I was creating the project and then I was able to create the project without any issues. Give this a try.

How do I upgrade Java Compiler?

I'm using JCreator to work with Java. I got this exception (or maybe error?) it says the following:
major version 51 is newer than 50, the highest major version supported by this compiler.
It is recommended that the compiler be upgraded.
I downloaded the last version of Java SE, but that didn't work.
By the way, Java files compile fine and also run without any problem. But I have downloaded a file that my instructor has upload with many java classes and this message appears when I try to run the class that has the main method.

I've never used JCreator, but a little bit of Googling gave me this page of JCreator installation instructions, which has the following instructions for manually setting the JDK that JCreator uses:
Starting JCreator Without Using the Setup Wizard
With JCreator active, open the Options window from the Configure menu.
Click the JDK Profiles option.
Click the default item in the list, and click Edit.
Ensure that the Name field shows the correct version of the selected JDK directory; in this case, JDK version jdk1.6.0. [ That's a typo I think ... ]
Set the JDK Home path by clicking the Browse button next to this field.
Browse to the root directory of the JDK installation: C:..\jdk1.7.0. Click OK.
Click the Documentation tab, and Add the path: C:..\jdk1.7.0\docs. Click OK.
Close the windows.
Yours is a slightly different scenario, but I think these instructions should also work for changing the JDK for an existing installation of JCreator.
(Use the pathnames of your latest JDK installation ... obviously.)