After upgrading to the 10.13 osx version (high sierra) iReport fails to start.
The question relates to the iReport not starting using JRE 8 issue but is triggered by the osx upgrade, and an osx user is not aware of the cause of the problem.
The failure is caused by the updating the Java version, which defaults to Java 8. To solve the issue:
jdkhome='/Library/Java/JavaVirtualMachines/jdk1.7.***/Contents/Home'