I am using macOS Big Sur and OMNeT++ 5.6.2. I followed the instructions from the manual for the installation.
However, when typing omnetpp to start the IDE, I see the OMNeT++ icon showing up for only a split of a second. The error.log file says:
omnetpp[62922:141543] CheckForInstalledJavaRuntimes: Please visit http://www.java.com for information on installing java.
Nevertheless, my java-version is:
% java -version
java version "1.8.0_281"
Java(TM) SE Runtime Environment (build 1.8.0_281-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.281-b09, mixed mode)
I guess everything is fine so far, but I have no further idea to solve the error mentioned above and I am glad about hints. Thank you.
This is an issue that comes from Eclipse and not directly from OMNeT++.
You first should make sure that you have Java installed (according to the issue mentioned in your error.log file).
You could do that by:
brew install --cask adoptopenjdk8
After you finished that, you may solve the issue by adding
<string>-vm</string><string>Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java</string>
to the ide/omnetpp.app/Contents/Info.plist file within your OMNeT++ 5.6.2 folder. The string should be added to the array element at the bottom of that file