Build .jar file with eclipse (help for a beginner)

mennootje · April 20, 2021, 8:36pm

Hello, first of all great to see this active community. I’m working with openhab nog for a couple of weeks. To connect my Google Nest Doorbell, I have to install a custom .jar file. I know where to put this file on my RPI. But I really need help building this .jar file.

What I’ve done: I have installed Eclipse on my Macbook. Also installed latest version of java. But when I’m importing a total github library and try to export the JAR file, I see a lot of errors (820), like:
AvailabilityTracker cannot be resolved to a type
Before cannot be resolved to a type
ChannelConfigurationTypeAdapterFactory cannot be resolved to a type

See image for more details:

Hopefully someone could give me some tips/advice on what to do. I’ve searched the internet for more then a week to find a solution by myself, but I have still nog found it.

Thank you already!

Bruce_Osborne · April 20, 2021, 9:33pm

openHAB 3 requires Java 11, the latest LTS release Is that what you installed?

J-N-K · April 21, 2021, 5:37am

Did you follow the instructions for developing openHAB addons? Did you install maven? Also openHAB 2.5.x is Java 8.

bagginstyrone · April 21, 2021, 5:52am

@mennootje I think i should move on latest version of java. It will defiantly clear this error. Thanks man for giving me solution of this problem.

mennootje · April 21, 2021, 4:53pm

Hi Bruce,

Thank you for your answer. I have installed: https://www.oracle.com/nl/java/technologies/javase-jdk11-downloads.html

mennootje · April 21, 2021, 4:55pm

Hi J-N-K, I have installed Maven and Java 11. Is Java 11 not ok (is newer version)? And I’ve followed some instructions. But do you have a link to the instructions you mentioned. Maybe this is a different/better one.

Thanks a lot!

mennootje · April 21, 2021, 4:56pm

I’m on Java SE Development Kit 11. Is this the latest version?

Bruce_Osborne · April 21, 2021, 4:57pm

That should be the correct version if you are working with openHAB 3.

If you are working with the older openHAB 2 it requires Java 8. The image in your first post indicates openHAB 2.5.x so you need Java 8, not 11.

J-N-K · April 21, 2021, 5:50pm

Did you try mvn clean install on the command line? Does that work?

„Export jar“ sounds wrong, you must use maven to create the jar.