JVM specs for 1.4

Are there any changes to the JVM spec for 1.4 ?
Sun still only have the old JVM spec for download (Rev 2 of the Lindhold/Yellin book, I believe).
Thanks in advance !

If I am reading the docs right the compiler can
convert this
assert i==0;
assert (i % 2)==0: i
.To this
if (!(i==0)) throw AssertionError();
if (!((i % 2)==0)) throw AssertionError(i);
.As such nothing needs to be changed in the JVM spec.
Naturally the Java Language Spec must change.Exactly, they added some new hidden fields to the class files that are switched on/off during class loading. Basically, there are new static fields in every 1.4 compiled class that are boolean flags indicating wether or nor asserts should be checked. During class loading they are fipped to the proper state. This way you can enable asserts for certain classes (and packages) but not others. The byte code generated for the assert statement looks like what jschell put up. (with some code to check for asserts in the first place)
So 1.4 compiled classes should still work in the old jre.

Similar Messages

Looking for JVM spec

hi
Im looking for a full JVM spec. that comments about file system, task schedulling, memory managment and so on...
I couldn�t found one that tells me all this. So I was wondering if some one could tell me where to find one. If the solution is to read the source code, please tell me where to find it for Linux or W32.
Thanks!!!!!!!

The page http://java.sun.com/docs/ contains links to nearly all the Java documentation you'll ever need, including the JVM spec, language spec, API docs, tutorials, and much more.

JVM specifications for package-info synthetic interface

Hi,
I have several questions about the synthetic interface.
1) javac doesn't tag it as synthetic. Why?
2) Why do we need it if the package declaration is tagged with an annotation for which the retention is RetentionPolicy.SOURCE. The .class file won't have any visible or invisible runtime annotations in this case, so why do we need a .class file?
3) Where can I get an update specs of the chapter 7 of the JVM specs?
Thanks,
Olivier

This is the wrong forum. Generics don't mean generic
questions, it mean generic types aka parameterized
types.
1) javac doesn't tag it as synthetic. Why?It doesn't really matter. It is not a valid Java indentifer, so
it must be synthetic. However, it would probably be a good
idea to mark it synthetic. I have created RFE 6232928. It should be
available on this URL in a day or two:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6232928
2) Why do we need it if the package declaration is
tagged with an annotation for which the retention is
RetentionPolicy.SOURCE. The .class file won't have
any visible or invisible runtime annotations in this
case, so why do we need a .class file?I guess you can just delete it if you don't need it.
3) Where can I get an update specs of the chapter 7
of the JVM specs?I think the latest public draft is here:
http://www.jcp.org/en/jsr/detail?id=924
However, I think that this page will soon have
something newer:
http://java.sun.com/docs/books/vmspec/index.html

Recommended JVM Parameters for Master and ClientManager (v 6.1.0)

What are the recommened JVM parameters for a master and client manager running on the same Linux machine?
Current VM Specs:
OS: Suse Linux
Processor Count: 4
Physical Memory: 8GB
Using Java: jdk1.6.0_13
Current Master Params: JVMARGS=-Xms2048m -Xmx2048m
Current Client Manager Params: JVMARGS=-Xms2048m -Xmx2048m -XX:PermSize=128m -XX:MaxPermSize=128m
Recommendations would be appreciated.
Thanks!
Grant Alexander

What are the recommened JVM parameters for a master and client manager running on the same Linux machine?
Current VM Specs:
OS: Suse Linux
Processor Count: 4
Physical Memory: 8GB
Using Java: jdk1.6.0_13
Current Master Params: JVMARGS=-Xms2048m -Xmx2048m
Current Client Manager Params: JVMARGS=-Xms2048m -Xmx2048m -XX:PermSize=128m -XX:MaxPermSize=128m
Recommendations would be appreciated.
Thanks!
Grant Alexander

Clarifications on JVM specs about Threads

Reading the JVM specs, we can see that Threads are allowed to keep working copies of variables. Those working copies are flushed back to the main memory when exiting a synchronized statement. My question is:
- if a variable is let say, a String object, then what is the variable as in the thread JVM naming scheme?
I think this will only be the reference to the string that can be duplicated in the Thread'sown memory, but one of my collegue says it will be the whole String object that will be copied over. I'm starting to get confused so what do you guys think about it?
references: http://java.sun.com/docs/books/vmspec/2nd-edition/html/Threads.doc.html#21294

Thx.
In the meantime I've also found the JVM specs chapter that explains all of it. Here is the link for those who might be interested:
http://java.sun.com/docs/books/vmspec/2nd-edition/html/Concepts.doc.html#17203

How come nobody pointed to the JVM Spec?

Apologize for not knowing where the "usual channels" are to unlock this thread so the hearing of technical facts can continue.
From the [JVM spec 3.6|http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html#17257] third paragraph:
"The sizes of the local variable array and the operand stack are *determined at compile time* and are supplied along with the code for the method associated with the frame (4.7.3). Thus the size of the frame data structure depends only on the implementation of the Java virtual machine, and the *memory for these structures can be allocated simultaneously on method invocation*." (emphasis mine)
The two principals in the locked thread both have support in the JVM spec- local variables are allocated statically at compile time but the actual physical memory for them is allocated dynamically at runtime. Am I understanding that paragraph correctly?

pete_d wrote:
jverd wrote:
The closest Java comes to C++'s #1 static memory allocation is String literals. The compiler stores them in the .class file, and the "address" (the reference value) of the String objects remains the same throughout program execution, as far as I know. Granted, what's in the .class file still has to get allocated on the heap when the class loads--unless it's already there--but if you view that as an implementation detail, and squint real hard, and maybe hit yourself on the head with a hammer, you could almost imagine that String constants are "statically allocated."I'm sensing that the JVM has a very different architecture than a ordinary computer and thus the problem with the regular definitions.I don't see that.
First it isn't that different. There isn't anything special about the VM. Interpreters existed before Java and have continued to exist. I am pretty sure interpreters existed at least in the 70s. Perl at least up until 6 was based on an intermediate form. You could actually save the intermediate form and run that rather than the 'normal' way of executing the perl script every time.
Second one still needs to look at what is going on in terms of something resembling standard definitions.
If one wishes to restrict oneself to the Java language itself, then regardless of the implementation details of the compiler it doesn't "allocate" anything. Because until the code runs there is no allocation.
If one wishes to include the VM specification (rather than implementation) then one can note that there is nothing specifically that indicates any static allocation either and certainly nothing that the compiler controls.
Consider a bytecode - istore, which takes an index. It stores into the position defined by the index. This is an instruction created by the compiler. The instruction itself does not suggest allocation. A direction to store is not a direction to allocate. The instruction presumes the allocation has already been done.
Consider a method call defined in the following.
        // Basic java code
        test(1);
        static int test(int i){ return i; }
        //byte codes for call
       0:   iconst_1
       1:   invokestatic    #2; //Method test:(I)V
       // byte codes for method
       public static int test(int);
       0:   iload_0
       1:   ireturnThe above represent byte codes emitted by the compiler. I see nothing that suggests allocation. Again at that point the compiler assumes that the stack frame exists.
Consider the class file structure which is generated by the compiler. From that the code_attribute defines code and it has the max_stack is nothing but a 16 int.
It is just a size. One needs the size to do the allocation but the size is not the allocation.
In terms of the above and what the compiler does it assumes that something will do correct allocations based on the data that it provides. Still isn't the same as doing the allocation.

What are the ideal specs for a DigiBeta master tape when authoring a "widescreen anamorphic" 16:9 SD DVD (original aspect ratio is 14:9)?

I just received the masters for a new SD DVD. I would like to author a "widescreen anamorphic" SD DVD horizontally squeezed widescreen image stored in a standard 4:3 aspect ratio DVD image frame. (On 4:3 displays, mattes should preserve the original aspect ratio. On 16:9 displays the image will fill the screen at the highest possible resolution.)
Below I've listed the specs of the Digi Beta master tapes the producers have sent to me for digitizing. I'd like to know this: What are the ideal specs for a DigiBeta master tape when authoring a widescreen anamorphic SD DVD, using material with an original aspect ratio of 14:9?
I've also listed my guesses below. Please let me know if my guesses are right. If not, please suggest alternatives (and if possible explain why.)
TECHNICAL SPECIFICATIONS OF EXISTING MASTER:
Tape: DigiBeta
Original Aspect Ratio: 1.55 (14:9)
Vid Rate: 29.97 fps
Pixel Aspect: NTSC - CCIR 601
Frame Size: 720 x 480
Anamorphic: Full-Height Anamorphic (16:9 image displayed in letterboxed, non-distored 4:3)
Display Format: 4:3 Letterbox
MY GUESS AT IDEAL TECHNICAL SPECIFICATIONS (for a DigiBeta, that is):
Tape: DigiBeta
Original Aspect Ratio: 1.55 (14:9)
Vid Rate: 29.97 fps
Pixel Aspect: Square
Frame Size: 720 x 540
Anamorphic: YES
Display Format: 16:9 Anamorphic (horizontally squeezed widescreen image)
Please feel free to ask for clarification or further information you need to answer my question.
Thank you so much in advance for your help!
Best, Noetical.
BTW, I can't wait for the day when everything has gone digital and we get digital intermediates instead of tapes to digitize!

Hi Nick...thanks for taking the time to reply to my question.
Nick Holmes wrote:
What you have there is a mess.
NTSC pixels are never square.
NTSC is 720x486, even when it is Anamorphic.
You shouldn't be using an already letterboxed master to make an Anamorphic version. Get the master that was made before the letterboxing stage.
When you make an Anamorphic DVD it should display as 16:9 full screen automatically on widescreen TVs.
The same DVD will automatically letterbox on 4:3 TVs.
Um yeah...duh. That's exactly what I was trying to explain in the preface of my question. I'm sorry if I didn't make it clear...all these things you mention are the reasons I'm putting together a list of the technical specs of the DigiBeta I need so I can have them send that instead of the stupid letterboxed version.
Look, I'm sending this request to some intern at their offices in England, asking for a master with which I can make an Anamorphic DVD. They already sent me this master, which as you and I both agree is an idiotic asset to use for these purposes. As such, I was hoping for advice on a more precise way of requesting the master that I need than asking for "the master that was made before the letterboxing stage." Upon reflection, perhaps I'll just do that. If you or anyone else has a suggestion about something I should add to my request that would improve the odds of them sending the tape I need, please repond. Thank you!
BTW, It's been a long time since anyone has responded to something I've written or said as though I'm an idiot. I remember now that I don't really like it. (Moving along...)

Can someone help me with optimal specs for a 2012 R2 server migration from 2003 R2?

My specs for the Windows Server 2003 R2 which is our file server are:
Intel Core 2 CPU 6600 @ 2.40GHz (2 CPU's), ~2.4GHz Processor types are x86 Family 6 Model 15 Stepping 6 GenuineIntel ~2399 Mhz Physical Memory is 2 GB RAM Virtual Memory is 4 GB We have 6 fixed drives in place. They all range from 300 GB to 1 TB in total space.
We have two roles on the file server in place which are File Server and WINS Server. We have QuickBooks running on it and a bunch of random smaller applications as well.
When it comes to purchasing servers, we're open to either getting all the parts and building it from the ground up or a built machine. So my question is when getting Server 2012 R2, based on what I said, what hardware should I be getting? If you need more information,
please don't hesitate to ask.
Also, if you know where I could find quality documentation on the actual migration process for a file server between 2003 R2 and 2012 R2, please let me know.
Thank you for reading. ^_^

Hi,
Since Microsoft is ending support for Windows Server 2003 R2 mid-2015, there are a bunch of resources. To partially answer your question. I came across the following blog by Jose Barreto that might be able to help.
http://blogs.technet.com/b/josebda/archive/2014/11/05/migrating-file-server-from-windows-server-2003-to-windows-server-2012-r2.aspx
Thanks,
Jeff Thai
www.AvePoint.com
Please Mark Answered if my reply solves your problem. Thanks!

Paper weight specs for HPLaserJet 100 color MFP M175nw

I have been trying (without success) to find the paper weight specs for my HP LaserJet 100 color MFP M175nw printer. Both the user manual and the online help only offer useless, non-specified info, such as : Use only heavy paper that is approved for use in laser printers and meets the weight specifications for this product. Tried to search for the paper weight specs for this product - no luck! I want to print on 200gsm (laser friendly paper), but don't want to damage my printer. PLEASE help?
This question was solved.
View Solution.

I will provide a link to a page that should be able to help out. Once you have the page pulled up click on the drop down titled “Paper-handling Specifications” then click on “Paper Tray Capacities”. That will open a chart that gives chart that list the paper, Paper weight, and the Capacity. I hope that this helps. Here is the link: http://goo.gl/xBtGF.
I am a former employee of HP...
How do I give Kudos?| How do I mark a post as Solved?

Choosing specs for a mac pro

Hello all,
I've posted this question a few times in the past and am still a bit unsure of what specs i should go with. With the student/teacher discount coming to an end soon, I thought I'd give it one more go. I am also curious how the new mac pro might affect my decision. I will not be needing a 12 core, but did this new product affect the specs for the lower models?
I am looking for a computer that will help me run my small business and keep my art portfolio organized. I'm willing to spend around $3000 and am also willing to use another source to buy less expensive parts to install myself.
My concerns are that it needs to run pretty smoothly with multiple programs open, no overheating, plenty of space for file storage and application support.
Ideally this computer will be my work horse for many years to come.
The programs that would most likely be open in conjunction with one another would be a combination of the following...mozilla, itunes, adobe bridge, dreamweaver, illustrator, and photoshop.
Specifically, i'll be using it for...
building a few websites
managing my small business
large photo file editing
keeping business files, artist receipts, etc
cataloging my art portfolio (large photo files)
storing photos, music, and short videos
graphic design
infrequent film editing
infrequent sound editing
The programs i'll be using:
CS5 (mostly photoshop, illustrator, bridge, dreamweaver)
iphoto
itunes
maybe minimal finalcut/soundtrack pro
maybe minimal aftereffects
I received this response the first time I posted this question and have found it to be very helpful, thanks bill! I'm wondering if anyone else would like to expand on it or perhaps offer other options for my situation. Thank you all very much, any advice is appreciated.
"My advice would be to buy the standard configuration 2.66GHz Quad Core (i.e. 3 x 1GB RAM, 640GB hard drive) from the Apple store, with the exception of the graphics card which you can buy as a CTO option for $200.00. It is well worth the upgrade from the GT120 - I know, because I upgraded myself last November after using a GT120 for 4 months.
With regard to the memory, if you can afford it now, buy 4 x 4GB from OWC now. If not, I would suggest that you buy 2 x 4GB now, and then add another 2 x 4GB in the future. 16GB of RAM is a much better option than 8GB for your requirements. You can sell the 3 x 1GB RAM to OWC in "part exchange", and there would be little difference in price for 2 x 4GB to the CTO option of 4 x 2GB.
http://eshop.macsales.com/shop/memory/Mac-Pro-Memory#1066-memory
Instead of buying 2 x 1TB hard drives as a CTO option, you could purchase 2 x 1.5TB or 2 x 2TB HDDs for less money, and you would still have the 640GB. Spare drives are always useful. I use my original 640GB as a spare emergency system boot drive (OS and applications) in an external enclosure.
Another alternative is to wait a few more weeks, in case the rumours of the introduction of a new Mac Pro range in June have any foundation."

That advice looks pretty sound to me. What I would add is for internal drives you need one for storing your working files (better not to have those on your system drive but not really a big deal). And one for backup with Time Machine. What I also have is a separate external drive to clone my system so I have 2 backups.
And I have a partition on one of the internal drives that is used ONLY as a Photoshop scratch disk. This is by far the fastest solution unless you want to create a raid system. Never have your scratch disk on the same drive as your system drive, not even as a partition. You only need around 500 MB for this and it's best if that partition is dedicated only as a scratch disk.
You can create all of this with partitions for some of it, no need for lots of drives, except use different drives for Time Machine and your clone disk so both can't go out at the same time. I think for speed purposes that the scratch disk and Time Machine should be on internal drives, but Firewire 800 is pretty fast for an external.
Other than that your biggest concern is ram. Get as much as you can afford because that will determine your speed more than anything else.
I was working on a 4 year old iMac, which is a pretty good machine, but the limited 3 gb ram was causing problems because I have Photoshop, Illustrator and InDesign open all the time along with Mail, Chrome and a couple of others. When I got a Mac pro last year to replace it I got 8 gb of ram and the speed has been incredible.
Kevin
Edit: Forgot to mention that you shouldn't buy the hard drives or ram from Apple, they are way too expensive, get the minimum you can from Apple then get new stuff, OWC is a good source.
Message was edited by: Kevin Horn

E Business Suite 11i Server Spec for Linux?

Does anyone know, or can suggest possibilities, of a server spec for 11i on Linux. This is for a small company installation of 11i.
Where can I go to ansewer questions like this?
What Linux distributions are supported for 11i?
I was thinking of multiple CPU's, highpoint raid controllers to give RAID 0+1, and 1 or 2 Gb of memory.
thanks
Dave Darrall.

Jimmy,
Our E-business suite 11i has been running on the application tiers RHEL 4, due to the requirement to support large memory configurations on a 32-bit system. Is it true that from RHEL 5, the “hugemem” kernel which achieves this 32-bit memory scalability has been deprecated in favour of the use of 64-bit kernels?
Your 11i application tier will be limited to 32-bit even if you install 32-bit OS on x86-64 hardware.
Our Oracle 11g database is running on RedHat Linux 5.8. Is E-Business suite 11i (application tiers) certified to run on RHEL 5.8?
Yes.
Also for future planning, is E-Business suite 12 (application tiers) certified to run on which versions of RedHat?
Please see:
Oracle E-Business Suite Installation and Upgrade Notes Release 12 (12.1.1) for Linux x86-64 (Doc ID 761566.1)
Oracle E-Business Suite Installation and Upgrade Notes Release 12 (12.2) for Linux x86-64 (Doc ID 1330701.1)
Thanks,
Hussein

Minimum Spec for FCE4: cheapest Mac Mini?

I'm looking to get a Mac Mini primarily to record endoscopic video (s-video) via a Canopus ADVC 55 using Final Cut Express. Looking at the minimum requirements for FCE4 it seems the cheapest model with 2GB RAM should be way more than adequate. The specs don't even mention hard drive speed.
However, by todays standards 2GB is fairly minimal, and the 5400 rpm 2.5" hard drives are quite slow. I have used FCE4 on an original white MacBook and frequently got dropped frames when recording (which lost the entire recording each time), a problem that disappeared when I upgraded to a MacBook Pro.
If used purely for recording, and if the hard drive is regularly cleared (video files moved to a Mac Pro for processing) will there be any problems with only 2GB of RAM, or the speed of the hard drive?
Because this is to go into an operating theatre where space is limited, I would prefer that I don't have the hassle or expense of an external Firewire hard drive (and I'm guessing the single Firewire port may be an issue).
Looking at the spec for the Mac Mini Server it looks much more suitable, 2 7400 rpm hard drives, 4GB RAM - but cost wise I think will be harder to persuade my employer!

I'm afraid I cannot really answer your question as I don't need / use the features of the snow leopard server software. Hardware wise the differences add more ram, 2 hard drives (and they're faster) but no optical drive (with the option of connecting one externally). Other than that it comes with snow leopard server which allows you to use it as a normal mac, but additionally can be set up as mail server, file server, and a bunch of utilities to help manage this (not sure how accurate my understanding of the differences between the software).
Incidentally the normal version of snow leopard has a certain amount of server functionality anyway, eg filesharing, web hosting etc. I think the server edition mainly provides lots of tools to take this further.
It definitely would require configuring, and you would need other stuff like a router to connect the computers together which would also need configuring. But not much different to linking a bunch of normal macs together (if you're usinng it as a file server). I might be wrong but I don't think the connected computers can run on it's OS like some of these dumb terminal systems can.
Message was edited by: bilbo_baggins

Minimum specs for use as a media centre?

I would like to have a Mac Mini hooked up to my tv to use as a media centre. i have worked out that i will be able to use it without a keyboard mouse etc by setting it up so front row or vlc load up on boot and using the remote, so am ok there...
my question is this - what is the recomended spec for it to be able to play hd movie rips in .mkv/mp4 format? i have a 1.25ghgz emac an that suffers horribly so i want something that will do the job effortlessly. obviously i could just buy the very latest MM but am looking to save a bit of cash if possible!
thanks for any advice...

Welcome to Apple Discussions!
It might help to know in what way the 1.25 eMac suffers horribly in this situation, because in reality, the media centre functions of a system don't require particularly high performance or system specifications. For example, I have a 1.5 G4 mini hooked up to a TV, use Front Row to play mp4 movie files and either VLC or DVD player to play DVDs and it performs pretty well. The quality of image of the mp4 playback depends on settings when the files were ripped more than anything, and the overall quality of image depends a lot on the TV rather than the system.
It must be said that the almost any of the Intel minis is considerably more powerful than your eMac, but in itself, power isn't necessarily the answer!

Tech Specs for 24" Imac Screen/Comparison

Does anyone have the actual tech specs for the screen itself in reference to the 24" Imac (response time, etc.)
How do you think the screen on the 24" Imac compares to this HP 24" monitor?:
http://www.shopping.hp.com/product/display/display/1/storefronts/RY117AA%2523ABA

blair.harrington wrote:
Does anyone have the actual tech specs for the screen itself
in reference to the 24" Imac (response time, etc.)
The 24" ALU iMac's display panel is an *LG.Philips LM240WU2-SLB1*.
According to TFTcentral, it's an 8-bit S-IPS panel. For more specs see:
http://www.tftcentral.co.uk/articles/panel_parts.htm
Great specs, but the specs don't say anything about iMac's problems with
uneven backlighting. The white 24" used the LG.Philips LM240WU2-SLA1,
and had a gorgeous display -- as does NEC's professional LCD2490WUXi.
Check the specs, but also check some [24'' ALU iMac screen photos.|http://picasaweb.google.com/TheLooby]
How do you think the screen on the 24" Imac compares to this HP 24" monitor?:
[HP w2408|http://www.shopping.hp.com/product/display/display/1/storefronts/RY117AA%2523ABA]
I don't have a mfgr's part number, but it uses a 6-bit TN panel. Faster
than S-IPS, but significantly poorer viewing angles. OTOH, it probably
doesn't have the brightness gradent problems common in ALU iMacs.
For $75 more, HP's LP2465 and Dell's 2407 have superior 8-bit LCD panels,
and much better warranties (3-year & 5-year versus 1-year on the w2408).
I'm sure there are many other good (or better) choices as well, but I haven't
been monitor-shopping lately.
Looby

FUNCTIONAL SPEC FOR ABAP REPORT DEVELOPMENT

Hi There,
Can someone please help with a sample of Funtional specs for ABAP Z report development that i could give ABAPer.
You can scrub the report for names cof company and other personal info, i just want to see what is essential and what is not essential and the presentation.
Please you can send to my email [email protected]
Thanks

Hi,
Functional Specification is written by the functional consultants to give to the ABAPers where there will write technical specifications to meet the requirement.
Regarding your issue, u have to first know
whats the requirement is
when to start with either T.Code and
at what field
who are authorized to do that
How we do that
How this integrated with other modules
what implications it is going to reflect in other modules
the approval from the repective supervisors
and finally viewing the output
and rectifying the same after going through the technical requirements.
Mohan
Award pointsif it helps.

JVM specs for 1.4

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