Java Compilation Process and how it relates to portability

I need to know more about the java compilation process, how it achieves porability and its drawback and benifits. Can anyone help me with a link or an answer?
Help would be much appriciated!

javac, the Java compiler, is written in Java itself. It generates .class
files from your .java source files. Those .class files are loaded by the
JVM (the Java Virtual Machine) and executed. The javac compiler
itself consists of just a bunch of those .class files and the compiler
doesn't even know on what platform it is running while compiling
your .java files.
If you simply carry over the tools.jar file (and some other .jars) in which
the package com.sun.tools.javac resides to another platform where a
JVM is installed you can compile your .java files on that other platform
too. And those compiled classes will run on that platform too ;-)
kind regards,
Jos

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For many years, many have complained of external drives that are in standby/sleep spinning up for no apparent reason. From the user's point of view this is unnecesssary, but to make matters worse, the system usually stops everything else while waiting for the drives.
I have a Mac mini that I use as a home theater pc. The media and backups are on a 5-bay enclosure (no RAID) attached by USB. While watching a video, the unused drives will go into standby mode, which is good. But then, with no user activity, they will spin up, freezing the video and everything else, which is not good. As these are slow drives and spin up sequentially, this can take 10-20 seconds. This may happen once or twice an hour, but sometimes more frequently.
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cd /Volumes/<drive1 and then repeat for other drives>
     rm -rf .fseventsd .Spotlight-*
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     touch .fseventsd/no_log .metadata_never_index
As far as I can tell this has worked to stop those processes from accessing the drives after they are mounted, but the problem persists. To find out what else might be causing them to wake up:
sudo fs_usage -w | grep -e Volumes/<drive1> -e /Volumes/<drive2> . . .
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18:35:36 fsgetpath   /Volumes/XBMC         0.000026   SSDragHelper
18:35:36 fsgetpath   /Volumes/Stuff        0.000006   SSDragHelper
18:35:36 fsgetpath   /Volumes/DatOptic_3   0.000005   SSDragHelper
18:35:36 fsgetpath   /Volumes/MacBackUp    0.000003   SSDragHelper
18:36:15 fsgetpath   /Volumes/XBMC         0.000026   System Prefe
18:36:15 fsgetpath   /Volumes/Stuff        0.000004   System Prefe
18:36:15 fsgetpath   /Volumes/DatOptic_3   0.000003   System Prefe
18:36:15 fsgetpath   /Volumes/MacBackUp    0.000003   System Prefe
18:55:36 fsgetpath   /Volumes/XBMC         0.000034   GoogleSoftwa
18:55:36 fsgetpath   /Volumes/Stuff        0.000004   GoogleSoftwa
18:55:36 fsgetpath   /Volumes/DatOptic_3   0.000003   GoogleSoftwa
18:55:36 fsgetpath   /Volumes/MacBackUp    0.000003   GoogleSoftwa
After looking into the Google process, I was surprised to find the tentacles that Google puts into your system, and ripped every bit of it out that I could. But I have no idea about what's going on with SSDragHelper and System Prefe (presumable System Preferences). This must be OS X itself? What are these processes doing, and is there any way to prevent them from accessing these disks in this way?

Thanks for the reply Hen3ry. Looks like you've done a lot of investigation. For me, fs_usage entries accompanying spindown are not problems - I'm happy if the drives spin down. My problem is the spinups. But still, I don't think it is necessary to time the fs_usage entries with spinups. If you grep for the drives you're concerned about, you will see any process that would potentially wake them up.
Because my understanding is limited, I also am more concerned with the process/application that is accessing the drives than with the functions or commands they are sending. And the values that are returned by those functions are way beyond what I can deal with.
It's interesting that you've found a difference between your old and new drives. Could you specify the enclosure and drives in each case?
The StorageStatus app looks interesting; thanks for the tip.
Here's a summary of what I've done so far, which I think is working. I need a few more weeks to know for sure.
How to prevent unwanted drive spin-ups
If you are actively using the computer that the enclosure is attached to, nothing on God’s green earth will stop OS X from waking them up after some user action, even ones that seem to have nothing to do with the external drives. But if you leave the computer alone while some application is running, like watching a movie or downloading a file, you have a fighting chance of coaxing OS X into leaving the uninvolved drives alone.
If the drives are shared with any other computers over a network, eject them on those computers
Otherwise, OS X (AppleFileServer) will poll them every 10 seconds. This might not be bad if you want to just keep the drives spinning and the other computer stays awake.
Third-party apps
Make sure no apps are running that might access your drives. Google runs some processes that do this (maybe I’m naïve, but I was so shocked I removed chrome and every other trace of Google from my Mac mini system). Another is iStat and any utility that monitors SMART status in the background.
Don’t let Spotlight index or search the drives
Spotlight is persistent, and it may be necessary to take a variety of steps to stop its various processes (mds, mdworker) from accessing the drives and waking them up. In other words, kill it, drive a stake through its heart, then burn the body:
In System Preferences > Spotlight, add the drives to the Privacy pane.
Add a file called .metadata_never_index to the root of each drive (note the leading period). The easiest way to do this is in Terminal
touch /Volumes/<drive1>/.metadata_never_index
Tell Spotlight AGAIN to keep away from the drive:
mdutil -i off /Volumes/<drive1> /Volumes/<drive2> . . .
Finally delete the Spotlight folder from the drive.
rm -rf /Volumes/<drive1>.Spotlight-*
Stop fseventsd from logging in the drive
This is easy, just putting a no_log file in its folder. I have found that rarely it still writes some files in there, but it doesn’t seem to do so when it causes problems, so . . .
          rm –rf /Volumes/<drive1>/.fseventsd/*
     touch /Volumes/<drive1>/.fseventsd/no_log
Finder sidebar
Some people say that if the drives show in the Sidebar of Finder windows, the Finder will be checking them. I’m not sure. But to be safe, in Finder Preferences > Sidebar, uncheck External Disks.
Just say no to Time Machine
On the home theater mac itself, regular backups shouldn’t be needed. You should be able to just turn Time Machine off. However, it is probably sufficient to simply open System Preferences > Time Machine > Options and add the drives to the list of locations to exclude from backup.
Second, local backups can be disabled with
sudo tmutil disablelocal
Look for other culprits
If the problem persists, use fs_usage, which generates a real-time log of filesystem activity. There is so much going on that you need to use grep to restrict the output to entries that involve your drives. The entries that accompany your drive spin-ups are the ones you really want.
sudo fs_usage -w | grep -e Volumes/<drive1> -e /Volumes/<drive2> . . .
Now leave the keyboard and mouse alone, as many things you might do will cause the drives to be accessed. You probably want to find what does it when you’re not actively interacting with the computer. It’s not really necessary to wait for your drives to sleep and see what wakes them. Any activity you see would probably wake the drives if they were asleep. When you see some activity and want to stop and examine, type Control-C to stop the output. On the far right of each entry is the process or application that accessed the disks.
I got pointers from http://system-log.tyr.org.uk/2012/01/31/how-to-stop-usb-drives-from-spinning-up- unnecessarily-on-os-x-lion/ and http://www.jackenhack.com/disk-that-refuses-to-sleep-in-mac-os-x-how-to-fix-it/

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Hi all,
Right I have loads of one off songs by many artist, or I just have the singles from albums, etc. To save having hundreds of single songs on their own I put them all together in a self-made compilation album with the decade as the album. So I have a 1960s, 1970s, 1980s, 1990s and 2000s album. I also have a Disney album, with all different movies as the artist, I do the same with Musicals. It's just helps with tidying up my library. When I sort by Album I would like the artists to be listed alphabetically, which doesn't always happen. I don't know what to do to make it happen. Especially if I have a full musical soundtrack that has the tracks listed, and I have a few of them. Instead of each artist being separate the tracks are all muddled up and listed numerically. For example the first track of The Book of Mormon is followed by the first track of RENT, then the second tracks come, all the numbered tracks are bundled. I hope that makes sense.
The other issue is when I transfer these songs to my iPhone. I want the album to appear as one album, but I want the artists to be separate. So I want one 'Songs from the Musicals' album but I want to look at artist and see every show listed separately. Again, I hope this makes.
I've seen how to add an 'Album Artist' which I tried, but that just gathers it up all into one artist. So to be clear, I want one album with multiple artists on my iPhone.
If you have any tips or help, it would be greatly appreciated as it's becoming increasingly frustrating trying out different combinations of options to see what might work.
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Thanks, if it's a feature of PL/SQL, that will be nice.
But both are bind variables, one is on bind variables peeking and the other is not. it's better for me to keep in mind it has a switch to control the peeking when using bind variables in PL/SQL, as I thought there is no way to avoid peeking when using bind variables...

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I was involved with your other thread, so I think I know what you are trying to do.
All Dr's answers are correct.
Now you have a program A written by you that does Runtime.exec() of multiple instances
of another program B written by you. You want A to somehow tell B to exit.
You must use some kind of Inter Process Communication. If this is the only interraction
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Edited by: baftos on Nov 5, 2007 2:15 PM

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Hi,
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Portal runtime error
Exception ID
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hi.
i have a laptop that i use completely for live music performance and i want to disable everything on the mac that could be taking up RAM and CPU power.
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i also notice itunes helper... whats that?
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many thanks....

hi.
thanks for coming back with an answer so quickly.
in activity monitor i can see spotlight is taking up about 25mb.
i have a 6GB music session to run with a huge CPU load so every bit of my 4GB RAM is taken up.
i do use spotlight a lot but could do without if it meant freeing up a little bit of space... it all helps!
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Hi all,
Not sure if this is the right forum to post in but I'll try.
I'm struggeling with compiling my FPGA code on a NI 9074 target with 8 modules. LabView FPGA tells me that it failed due to a xilinx error in the translation process. It looks like the ngdbuild.exe craches (I'm getting questions from CVI to start debugging an unhandled exception. This happens two times every I try to compile the FPGA code. But the exception seems to happen at different places every time. That is at least what I see from the debug window which appears, assuming the number in square bracets means line number in the source. This number seems to shift with every compilation. It shifts from 1864 to 5896.
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"mIoHWord_n" not found. Please verify that:
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ERROR:ConstraintSystem:59 - Constraint <TIMESPEC "TS_AsynchMite30"= FROM
PADS(mIoHWord_n) TO PADS(mIoDmaReq<*>) 0 ns;> [toplevel_gen.ucf(607)]: PADS
"mIoHWord_n" not found. Please verify that:
1. The specified design element actually exists in the original design.
2. The specified object is spelled correctly in the constraint source file.
ERROR:ConstraintSystem:59 - Constraint <TIMESPEC "TS_AsynchMite31"= FROM
PADS(mIoHWord_n) TO PADS(mIoDtack_n) 0 ns;> [toplevel_gen.ucf(608)]: PADS
"mIoHWord_n" not found. Please verify that:
1. The specified design element actually exists in the original design.
2. The specified object is spelled correctly in the constraint source file.
ERROR:ConstraintSystem:59 - Constraint <TIMESPEC "TS_AsynchMite32"= FROM
PADS(mIoHWord_n) TO PADS(mIoReady) 0 ns;> [toplevel_gen.ucf(609)]: PADS
"mIoHWord_n" not found. Please verify that:
1. The specified design element actually exists in the original design.
2. The specified object is spelled correctly in the constraint source file.
ERROR:ConstraintSystem:59 - Constraint <TIMESPEC "TS_AsynchMite33"= FROM
PADS(mIoHWord_n) TO PADS(mIoData<*>) 0 ns;> [toplevel_gen.ucf(610)]: PADS
"mIoHWord_n" not found. Please verify that:
1. The specified design element actually exists in the original design.
2. The specified object is spelled correctly in the constraint source file.
Done...
I'm not familiar with VHDL so I don't know the specifics of what really happens during the compilation. I dont have anything specail timing code in the VI except for loop timers.
I'm using LabView FPGA 2011, and xilinx 12.4. The code has compiled successfully on earlier LabView versions. There are no errors or warings in my LabView FPGA code that that LabView detects. Is this a bug in LabView FPGA 2011 or Xilinx 12.4?
I've attached the log files from the compilation process and the error summary that LabView FPGA gives me.
Thanks in advance.
Regards,
Anders Garmo
System Architercure Developer
Attachments:
FPGA error1.txt ‏26 KB
FPGA Xilinx Log.txt ‏1316 KB
fpga error 1.png ‏16 KB

Peter,
You are running into bug 1747626. I will send you an email with a fix.
Regards, Marc We have the same problem here. We have installed the bugfix but it still does not work.

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program code in z_ph3
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Hi
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IF SY-SUBRC = 0.
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MOVE INTAB-VALUE TO MY_VAR.
ENDIF.
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READ TABLE OUTTAB WITH KEY NAME = <VARIABLE NAME>.
IF SY-SUBRC = 0.
*---> Set the value to OUTTAB-VALUE
MOVE MY_VAR TO OUTTAB-VALUE.
MODIFY OUTTAB INDEX SY-TABIX.
ENDIF.
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Java Compilation Process and how it relates to portability

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