This happens with logs where the app was running JS with Nashorn, not sure if it happens otherwise.

$ /opt/jdk-10-b40/bin/java -jar ~/ssd/views/hs/open/src/utils/LogCompilation/target/LogCompilation-1.0-SNAPSHOT.jar -U -t hotspot_pid30794.log
Exception in thread "main" java.lang.InternalError: couldn't find bytecode
at com.sun.hotspot.tools.compiler.UncommonTrapEvent.setCompilation(UncommonTrapEvent.java:136)
at com.sun.hotspot.tools.compiler.LogParser.parse(LogParser.java:669)
at com.sun.hotspot.tools.compiler.LogParser.parse(LogParser.java:630)
at com.sun.hotspot.tools.compiler.LogCompilation.main(LogCompilation.java:137)