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Netbeans is using JDK 8 per the source or binary format as shown here:

source or binary format

How do i switch to zulu, which is 9?

thufir@dur:~$ 
thufir@dur:~$ javac -version
javac 9.0.0.15
thufir@dur:~$ 
thufir@dur:~$ java -version
openjdk version "9.0.0.15"
OpenJDK Runtime Environment (Zulu build 9.0.0.15+181)
OpenJDK 64-Bit Server VM (Zulu build 9.0.0.15+181, mixed mode)
thufir@dur:~$ 
thufir@dur:~$ sudo update-alternatives --config java
There is only one alternative in link group java (providing /usr/bin/java): /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
Nothing to configure.
thufir@dur:~$

Netbeans was installed through umake and zulu JDK 9 was installed through sdkman.

Thufir
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1 Answers1

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In the main Netbeans window you have to go to:

Tools -> Java Platforms

and add JDK 9.

If you used sdkman to get Java JDK then the path will be ~/.sdkman/candidates/java/9.0.1-zulu or similar (the path to Platform Folder in the screenshot below is different because I didn't use sdkman to get the JDK).

enter image description here

If once you have done that you see nothing in the Classes tab it probably means you are using a Netbeans version without support for Java 9. Try with a nightly build.

You can find more information regarding Netbeans Java 9 support on this page.

Johnny Baloney
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