In the change process through SAP JVM JVM Tool Switch appeared the following error message which prevented up to the instance:
transport error 202 could not find free port in debug port range
This error appeared in the log std_server0.out
After an analysis could determine that the error was produced because JAVA instances of my portal had the same default debug port (1024):
to resolve the error and conclude with changing JVM (JVM IBM to SAP JVM) disable debug options. finally change the instance worked and went up smoothly with the new JVM.