By setting the java property DEBUG to true
java -DDEBUG=true -jar installer.jar |
you get detailed log messages about
The property STACKTRACE
java -DSTACKTRACE=true -jar installer.jar |
does provide the stacktrace of an exception and their causes instead of a simple "something has gone wrong" messages.
(Some failure situations like "no space left on the target device" should be handled better in future)
The property TRACE
java -DTRACE=true -jar installer.jar |
does add a debug-frame on the right side of the installer window, where you can watch conditions and variables. Variables can also be changed.
When the installer description contains a modifier showDebugWindow=true
<guiprefs> <modifier key="showDebugWindow" value="true"/> </guiprefs> |
the debug-frame is shown in a separate window.