Java 8 Update 45 crashes with error message.

Question

MacBook Pro 13-inch, mid-2012, 4 GB memory
Yosemite (V10.10.3 - 14D136)
Running Java 8 update 31
Trying to install Java 8 update 45
Tried it at least 4 times. No way to do it. At every try, the download works OK (60.5 MB), then the windows says it extracts the update and, after a little bit of time, suddenly disappears without any error message or any other warning. I never get to the "Install and relaunch" step. Subsequent checks (no matter if it is done before or after a reboot) always show that I'm still running update 31.
Anybody knows what's going wrong there?
Regards,
Denis MAILLARD.

Answer 1

Thanks for the info about using the Console, Eric.
However, there doesn't seem to be much that is useful in the console log (unless it skipped my attention or the error messages are too cryptic).
Here below are the extracts from the log, for an update attempt in safe mode. The one possibly useful info I see there is the "22/04/2015 17:16:12,143 Java Updater[393]" line, if it is not just the info that the updater found the kit. If it is, then, unless there's an Oracle specific log with more info (and I don't know if there's one and, if yes, where), I'm afraid we can only conclude that the installer crashed, without more precision.
22/04/2015 17:14:28,265 com.apple.xpc.launchd[1]: (com.apple.watchdogd) Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
22/04/2015 17:14:31,133 Java Updater[393]: Original euid:502
22/04/2015 17:14:31,137 Java Updater[393]: Host name is javadl-esd-secure.oracle.com
22/04/2015 17:14:31,137 Java Updater[393]: Feed URL: https
22/04/2015 17:14:31,137 Java Updater[393]: Hostname check passed. Valid Oracle hostname
22/04/2015 17:14:32,723 java[394]: objc[394]: Class JavaLaunchHelper is implemented in both /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java and /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib/jli/./libjli.dylib. One of the two will be used. Which one is undefined.
22/04/2015 17:14:38,356 watchdogd[395]:  [watchdog_daemon] @(    wd_watchdog_open) - IOIteratorNext failed (kr=0)
time needed to download the kit
22/04/2015 17:16:09,257 com.apple.xpc.launchd[1]: (com.apple.watchdogd) Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
22/04/2015 17:16:10,000 kernel[0]: hfs: mounted Oracle Java 8 Update 45 on device disk2s1
22/04/2015 17:16:10,251 mds[74]: (Volume.Normal:2464) volume:0x7f82eb0b8e00 ********** Bootstrapped Creating a default store:0 SpotLoc:(null) SpotVerLoc:(null) occlude:0 /Volumes/039CFEDD-6130-4517-B929-E0EC2E6A4DFA
22/04/2015 17:16:12,143 Java Updater[393]: App found:/Users/denis/Library/Application Support/Java/Java 1.8.45.14 5/JavaAppletPlugin.pkg
22/04/2015 17:16:12,000 kernel[0]: hfs: unmount initiated on Oracle Java 8 Update 45 on device disk2s1
22/04/2015 17:16:19,349 watchdogd[438]:  [watchdog_daemon] @(    wd_watchdog_open) - IOIteratorNext failed (kr=0)
If anybody can say more, I'd be grateful.
Regards,
Denis MAILLARD.