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I am unable to create new netbeans projects on MacOS Mojave 10.14.1. When I choose File>New Project... --->> no dialog box opens and the IDE log is the following:

SEVERE [global]
java.lang.ClassNotFoundException: javax.activation.DataContentHandlerFactory
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:222)
Caused: java.lang.ClassNotFoundException: javax.activation.DataContentHandlerFactory starting from ModuleCL@27506e4f[org.openide.awt] with possible defining loaders [ModuleCL@4994c66[org.netbeans.modules.xml.jaxb.api]] and declared parents [org.netbeans.MainImpl$BootClassLoader@36d4b5c, ModuleCL@364f78b6[org.netbeans.api.annotations.common]]
    at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ...<snip>...
    java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
[catch] at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Ok, so here are some details so that I can post the question. I used homebrew to install the netbeans IDE. It did not give any errors. I am able to open an existing project (a dialog box does open for that).

azro
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Ralf Lukner MD PhD
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    NetBeans 8.2 will not work with any JDK > 8, so... [1] How many versions of Java are installed on your machine? [2] What version of Java is NetBeans actually using? (**Help > About** and **Tools > Java Platforms**). – skomisa Dec 09 '18 at 04:07
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    I had the wrong version of JDK installed ... so I tried to uninstall it: Ralfs-$ javac -version javac 11.0.1 $ brew cask uninstall java Then I installed the "correct version" brew tap caskroom/versions .... brew cask install java8 and set the $JAVA_HOME to the location of the jdk1.8.0_192. netbeans is using something else ... Java; VM; Vendor = 11.0.1; Java HotSpot(TM) 64-Bit Server VM 11.0.1+13-LTS; Oracle Corporation Runtime = Java(TM) SE Runtime Environment 11.0.1+13-LTS Java Home = /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home – Ralf Lukner MD PhD Dec 09 '18 at 21:29
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    After installing jdk1.8.0_192, the solution was to then edit the netbeans.conf file to set netbeans_jdkhome="/Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home" – Ralf Lukner MD PhD Dec 09 '18 at 22:06

1 Answers1

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Thank you @skomisa for pointing out the problem.

  1. I had the "wrong" version of JDK installed -- version 11.0.1 and netbeans was configured by default to use it.
  2. I then installed what appears to be the latest "correct version": $ brew tap caskroom/versions $ brew cask install java8 (jdk1.8.0_192).
  3. After installing jdk1.8.0_192, then edit the /Applications/NetBeans/NetBeans 8.2.app/Contents/Resources/NetBeans/etc/netbeans.conf file to set netbeans_jdkhome="/Library/Java/JavaVirtualMachines/jdk1.8.0_192.jdk/Contents/Home"
  4. Start netbeans and you are ready to go!
Ralf Lukner MD PhD
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