Give a java program more resources...in JVM

Is there anyway to give a java program more resources? For example, is there a method System.getXXXX() which gives this program higher priority and resources in the JVM?
I ask because i have a bean running on ATG Dynamo 5.1 but it runs very slowly and i want it to have more use of resources then other beans.

Try running the application in its own server. Then you give give it the resources it needs.

Similar Messages

Give my java program windows service property

hi programmers
how can i let my java program runs automatically when windows starts.
and i'd like to put an option to disable this property.(which is "run as service").
i hope my question is clear .
and i hope to find answers .
my regards
eng.hosam

I am developing a stand-alone java program. Lately,
whenever I debug or run the program it will shutdown
my computer. At first I thought it was the IDE
(Eclipse) I was using, so I switched to simple text
editor and command line compiles and runs.... it
still happened. Virus-infected files?
So my questions are:
1) If it is my program, what steps can I take to find
out why? (The crash always happens right when I
launch the program). Debug and watch whether it always happens at the same moment. But IMO it's unlikely because it's of your program.
2) Is it a memory issue? How can I find out?Could be in the sense of "defective RAM". Remove one bank. Try again. Set it back in and remove another bank. Try again.
3) Why would my computer crash when running a java
program? When I worked in C++, programs would crash
but not the computer. There was no time when my PC was booted more often than when I was writing C code in M$ VS6.

Give Java Program Execute Access Only

Hi,
Is there a way, on windows XP, to give a java program execute access only for a certain user. This would prevent the user from reading the program, being able to copy the program, or change the program.
Thanks for any info,
John

There is no way of giving "execute-only" access to a file in Windows. There is no "--x--x--x" access like Unix.
If you can execute a file, you must be able to read it, because Windows relies strongly in "resources" (like the version resource or the icon resources) that are present in the executable file and must be read by the program.
I believe that even in Unix you can't give "--x--x--x" access to a JAR file because it must be read by the "java" executable, instead of being directly loaded by the operating system.

JVM itself is a java program ...then from where JVM will run ......

Hello all,
JVM itself is java program. Then this too need another JVM to run ....so on ......PLZ tell me the answer or link where i can get more information abt this.
regards

JVM itself is java program. No! It is normally an executable specific to the operating system it runs on.

Java Programming Resources for starting out

Hey guys,
What are the best resources for starting out with Java. I did a bit of work with Java in my Uni course but it was about 2 years ago. I'd like to go over it from the start and get familar with everything again.
Can anyone suggest some good places to get Resources, Tutorials and Exercises for Java Programming?
Thanks in advance.

Getting Started With Java
[Sun's basic Java tutorial|http://java.sun.com/docs/books/tutorial/]
[Sun's New To Java Center|http://java.sun.com/learning/new2java/index.html]
Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
jGuru
A general Java resource site. Includes FAQs, forums, courses, more.
[Yawmarks List|http://forums.devshed.com/java-help-9/resources-for-learning-java-249225.html]
[The Java Developers Almanac|http://www.amazon.com/exec/obidos/tg/detail/-/0201752808?v=glance]
[http://javaalmanac.com|http://javaalmanac.com]
Bruce Eckel's [Thinking in Java(Available online.)|http://mindview.net/Books/DownloadSites]
Joshua Bloch's [Effective Java|http://www.amazon.co.uk/exec/obidos/Author=Bloch,%20Josh]
Bert Bates and Kathy Sierra's [Head First Java|http://www.amazon.com/exec/obidos/tg/detail/-/0596004656?v=glance ]
James Gosling's [The Java Programming Language|http://www.bookpool.com/sm/0321349806]
Gosling is the creator of Java. It doesn't get much more authoritative than this.
Joshua Bloch and Neal Gafter [Java Puzzlers.|http://www.javapuzzlers.com/]

Can you give me url to download movie to test in videoTransmit.java program

Hello friends,
I want to test VideoTransmit.java program which is available in java site.
I want to test that program but I have one movie and tested with that but it gave some error.
error:
C:\tempdownloads\webcam>java VideoTransmit file:/C:/tempdownloads/webcam/sample
_100kbit.mov 172.16.16.112 42050
Video transmitted as:
JPEG/RTP, 192x240, FrameRate=15.0
The input format is not compatible with the given codec plugin: com.sun.media.co
dec.video.colorspace.RGBScaler@1fee6fc
Failed to realize: com.sun.media.ProcessEngine@194df86
Cannot build a flow graph with the customized options:
Unable to transcode format: SVQ3, 192x242, FrameRate=15.0, Length=7522
to: JPEG/RTP, 192x240, FrameRate=15.0
outputting to: RAW/RTP
Error: Unable to realize com.sun.media.ProcessEngine@194df86
Error : Couldn't realize processor
S0, i requesting you can you give url to download small clips with extension
(*.mov) to test my program
thank you
ravikumar

Hello friends,
I want to test VideoTransmit.java program which is available in java site.
I want to test that program but I have one movie and tested with that but it gave some error.
error:
C:\tempdownloads\webcam>java VideoTransmit file:/C:/tempdownloads/webcam/sample
_100kbit.mov 172.16.16.112 42050
Video transmitted as:
JPEG/RTP, 192x240, FrameRate=15.0
The input format is not compatible with the given codec plugin: com.sun.media.co
dec.video.colorspace.RGBScaler@1fee6fc
Failed to realize: com.sun.media.ProcessEngine@194df86
Cannot build a flow graph with the customized options:
Unable to transcode format: SVQ3, 192x242, FrameRate=15.0, Length=7522
to: JPEG/RTP, 192x240, FrameRate=15.0
outputting to: RAW/RTP
Error: Unable to realize com.sun.media.ProcessEngine@194df86
Error : Couldn't realize processor
S0, i requesting you can you give url to download small clips with extension
(*.mov) to test my program
thank you
ravikumar

Using separate JVM for a java program, other than what's installed in OS

Hello all,
I am trying to use different version of java executable , other than using the version of java installed in the OS, in the windows.
Is linux, I believe I have used different version of java ( I suppose using different JVM ? )
Would there be any conflict between the version of java installed in the computer and the version of java in my program ?
Thanks
Kyle

venvidu wrote:
I see,
So, each java executable from the separate version is its own JVM + executable java code and different java executable can be run at the same time. I don't know what you mean by that. You start a new JVM when you start java.exe or javaw.exe (on windows), and you can have several VMs running, both of same version, and of different versions.
>
Then, in the windows OS, is there anything in the system file which store specific information about the installed java version ?The registry has some information, but a VM doesn't need to write anything to the registry, so it all depends on how you installed the VM.
>
The idea is that, on top of the installed version of java, I am trying to included pre-compiled java in my program. Huh? I don't understand that.
So that my program uses its own java version Ok
-- most likely, the latest version Why do you think so? You can release your software today with a JRE, but that JRE might not be the latest version 1 week later.
-- regardless of what the current windows OS has.
I know this poses no problem in the linux OS, but is there anything in the windows OS that might potentially corrupt the above approach ?I'm not sure that I have understood exactly what you said, but I don't see any problems.
Kaj

Can we give *.* as an input parameter to java program.

i have a simple java program. In the program Im giving the input parameter as *.*
But in the main method, Im getting the argument value as a different one. The name of one of the file in the current directory. Any thing that starts with * like *.txt* is giving the file name in the directory.
How to parse the *.* through input parameter.
public class test
public static void main(String args[]){
System.out.println("arg[0]-->"+args[0]);
}

This is a shell thing, not a Java thing -- your command line shell is expanding things like dot or star. You need to quote it to pass it to your program, unexpanded. The quoting syntax depends on your shell, but try single or double quotes:
java UrPrgm '.' '*'
//or
java UrPrgm "." "*"

How do you start a java program with more RAM alloaction

Hi
can anyone please tell me how to start a java program to start with lots of RAM (RAM size is sent as a parameter), I have seen it somewhere and now I cant remember it. I have a server application to run this way.
thanks and rgds
sunil

see the tooldocs of java: http://java.sun.com/j2se/1.4/docs/tooldocs/tools.html

Java program consumes far more ram on linux than on windows - why ?

Hello dudes,
i encountered a problem and i dont know how to solve it. i've a java application that consists of several classes and 3 threads. it consumes about 7 mb on win2k but up tp 100 mb on SuSE Linux and shows up 13 threads.
is this something wrong with java or with linux? have any of you guys already faced the same problem and solved it ?
thanks for any replies.

Be careful. The Linux ps command by default shows the individual threads of a Java program as separate processes when they are in fact not. The fact you have 13 threads is normal, most are for housekeeping and appear on Windows as well.
I can't speak to the total memory utilization, but make sure you aren't adding up the memory of each of the 13 lightweight processes (threads) and counting the same memory usage 13 times.
Chuck

Running a Java program on HP UX

Hi everyone
First time in life i have to make a Java program run on HP UX... the program is running perfectly in windows environment..... but when i copy the program to HP-UX and try to run it gives me following error
-----------------End Configuration-------------------------
Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/Savepoint
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$1(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va:468)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:314)
at java.sql.DriverManager.getConnection(DriverManager.java:517)
at java.sql.DriverManager.getConnection(DriverManager.java:177)
at StatInterface.main(StatInterface.java:58)
I can guess that this has something to do with Class path or java home... i even don't know how to set paths in HP-UX
can u ppl help me?
Following are the details
OS Version = HP-UX rpsvr02 B.11.11 U 9000/800 (ta)
JVM = java version "1.3.1.02" Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1.02-011206-02:17) Java HotSpot(TM) Server VM (build 1.3.1 1.3.1.02-JPSE_1.3.1.02_20011206 PA2.0, mixed mode)
$PATH value
.:/home/express/bin:/home/express/bin:/home/express/BIN:/usr/local/bin:/opt/java1.3/bin:/home/oracle/product/9.2.0.1.0/bin:/usr/bin:/usr/ccs/bin:/usr/contrib/bin:/opt/mx/bin:/opt/hparray/bin:/opt/nettladm/bin:/opt/upgrade/bin:/opt/fcms/bin:/opt/pd/bin:/opt/resmon/bin:/usr/bin/X11:/usr/contrib/bin/X11:/opt/graphics/common/bin:/opt/scr/bin://opt/perl/bin:/usr/sbin/diag/contrib:/opt/hpnpl//bin:/usr/bin/X11:/usr/sbin:/opt/java1.3/bin
I really need your help.. and it is really urgent.. plz
Thanx in advance

In the documentation for Savepoint it states "since 1.4"
You need a more recent version of java. I suggest using asupported version like 1.4.2_08 or 1.5.0_04 if you can get them.
If not try getting the source for 1.6.0 and compiling it for HPUX.

Cpu usage in java program

i have writen a java program and run on unix, the program will create a connection object which connects to a db, and create a scoket to communicate with another machine.
However, when i use the "top" command in unix and check cpu usage, it used about 35% at the begining, and after few seconds, it drops around 7-8%. May I ask if this is normal? any tips on writing java program which can save more system resources?
please advice. Thanks

Hello friend ,
I am Narayanan from PSNA ENGG College, Dindigul , TN ... I try to find CPU Usage in java and get success.... I am also try form same VC++ file... Try this following steps
if u wont get mail me::: [email protected]
Bye
Steps:
1. Create java file with name CPUUti.java
          class CPUUti {
          public native void displayCPUUsage();
          static {
          System.loadLibrary("hello");
          public static void main(String[] args) {
          new CPUUti().displayCPUUsage();
2.compile the program
               javac CPUUti.java
               Result: Get Class file
3.Create header file
               javah CPUUti
               Result: Header file CPUUti.h is created
4.Open the VC++ with Design wizard
          choose Win32 Dynamic Link Libarary
          Give Projectname, location
5.copy the source file and Header files which you want
Source files:
               CpuUsage.cpp
               Main.cpp
               StdAfx.cpp
Header Files:
               CpuUsage.h
               PerfCounters.h
               StdAfx.h
6. include the Header file CPUUti.h in header file
7. create new C++ source file getCPU.cpp in the same project
8.include getCPU.cpp file to the Sourcefile list in the same project
9.copy this code in to getCPU.cpp
               #include "CpuUsage.h"
               #include "CPUUti.h"
               #include "PerfCounters.h"
               #include "StdAfx.h"
               JNIEXPORT jint JNICALL Java_CPUUti_Display
               (JNIEnv * s, jobject s1)
                    CCpuUsage usageA;
                    CCpuUsage usageB;
                    while (true)
                         // Display the system-wide cpu usage and the "Explorer" cpu usage
                         int SystemWideCpuUsage = usageA.GetCpuUsage();
                         int ProcessCpuUsage = usageB.GetCpuUsage("explorer");
                         printf("System-wide Cpu Usage: %3d%%, Explorer cpu usage: %3d%%\r",SystemWideCpuUsage, ProcessCpuUsage);
                         Sleep(1000);
                    return 0;
10. copy the headerfiles which is present in the jdk\include and jdk\include\win 32
paste to the VC++\include\
11.Build the VC++ file.
12.DLL file is created inside the Debug\ folder
13.copy that DLL file and paste it to the java source file location
Run the java file and enjoy...................

Running a java program a set number of times

This is a general question. Is it possible to make a java program run only 5 times for the sake of arguement.
Basically I want to write a program that will give the user some flexibility when it will actually run another Java program, but I only want them to be able to say "not now' for a set number of times. When the last time comes the other program will launch. I was initially thinking of the Do Whilw loop, but this needs to work when the program is restarted.
Program starts, it has 5 times it will run before it does something else(doesn't really matter now I think). User takes option "Not Now" and the program ends, but warns the user this will run 4 more times before you will need to do something.
This process will repeat until the user takes the option "Ok install now" or the time limit expires and the install occurs anyway. Can someone point me in the right direction.

ok I see so it's like one those programs that you download for free on the internet and they give you a set amount times to use it before you have to pay for it. but in this case when the number of times you use it equals 5 (or when the user clicks ok) a different java app will open automatically.
My first thought would be to Write a Serialized object to disk using objectOutputStream that stores the number of times the application has been opened. and each time the program runs it checks for the serialized object and then you can do something like what I posted before. of course if were worried about security the user could always look for the object and erase it, if so then I guess we would have to come up with another plan of attack
Hope this helps

Java stored procedure vs. PL-SQL vs. external java program

Hi,
I'm using a stored procedure for running a query and a few consequent updates. Currently I'm using Java stored procedure for that, which was my choice for simplicity on one hand, and running with the DB on the other.
In my tests, strangely enough it came out that running as java stored procedure was 3-4 times slower than running as a java program outside the database. I don't know how to explain this, and I wonder if switching to PL/SQL will improve the performance of the code.
Any experiences? recommendations?
Thanks,
Dawg

In my tests, strangely enough it came out that running as java stored procedure was 3-4 times slower than running as a java program outside the database. I don't know how to explain this, and I wonder if switching to PL/SQL will improve the performance of the code.This isn't strange at all. See: Oracle's JVM (Aurora) is an independent Java Virtual Machine implementation, in accordance to specification. It implements all necessary parts of it (I think so). When you use an external JVM (I assume it's Sun's HotSpot JVM) you use completely different product. It is implemented in different way, it has many different code parts.
One of the biggest differences between Oracle's JVM and Sun's JVM is [Just-in-Time compiler|http://en.wikipedia.org/wiki/Just-in-time_compilation]. Oracle has implemented it only in the 11g version of database, i.e. 2 years ago, while Sun performed it back in 2000 and continues to improve it for the last 9 years. That would explain obvious differences between Java program inside and outside the DB: they are executed in absolutely different worlds. Diffs could be up to 10x times or more - that's not unusual.
If you are on 10g and want to compare performance of stored Java procedure vs external program, then you might use additional command-line instruction for external program to disable JIT:
-XintPS. I wouldn't use Java for your task - that's a total overkill. Use simple SP instead.

New TO JAVA Programming

Dear Forummembers,
I am student doing postgraduate studies in IT.i have some queries related to one of my programming staff.i am very much new into Java programming and i am finding it a bit difficult to handle this program.The synopsis of the program is given below -
You are required to design and code an object-oriented java program to process bookings for a theatre perfomance.
Your program will read from a data file containing specifications of the performance,including the names of the theatre, the play and its author and the layout of the theatre consisting of the number of seats in each row.
It will then run a menu driven operation to accept theatre bookings or display the current
status of seating in the theatre.
The name of the file containing the details of the performance and the theatre should be
provided at the command line, eg by running the program with the command:
java Booking Theatre.txt
where Theare.txt represents an example of the data file.
A possible data file is:
Opera
U and Me
Jennifer Aniston
5 10 10 11 12 13 14
The data provided is as follows
Line 1
Name of the Theatre
Line 2
Name of the play being performed
Line 3
Name of the author of the play being performed
Line 4
A list of the lengths (number of seats) of each row in the theatre, from front to
back.
The program must start by reading this file, storing all the appropriate parameters and
establishing an object to accept bookings for this performance with all details for the theatre
and performance.
The program should then start a loop in which a menu is presented to the user, eg:
Select from the following:
B - Book seats
T - Display Theatre bookings
Q - Quit from the program
Enter your choice:
And keep performing selected operations until the user�s selects the quit option, when the
program should terminate.
T - Display Theatre bookings
The Display Theatre Bookings option should display a plan of the theatre. Every available
seat should be displayed containing its identification, while reserved seats should contain an
Rows in each theatre are indicated by letters starting from �A� at the front. Seats are
numbered from left to right starting from 1. A typical seat in the theatre might be designated
D12, representing seat 12 in row D.
B - Book seats
The booking of seats is to offer a number of different options.
First the customer must be asked how many adjacent seats are
required. Then start a loop offering a further menu of choices:
Enter one of the following:
The first seat of a selected series, eg D12
A preferred row letter, eg F
A ? to have the first available sequence selected for you
A # to see a display of all available seats
A 0 to cancel your attempt to book seats
Enter your selection:
1. If the user enters a seat indentifier such B6, The program should attempt to
reserve the required seats starting from that seat. For example if 4 seats are
required from B6, seats B6, B7, B8 and B9 should be reserved for the customer,
with a message confirming the reservation and specifying the seats reserved..
Before this booking can take place, some testing is required. Firstly, the row
letter must be a valid row. Then the seat number must be within the seats in the
row and such that the 4 seats would not go beyond the end of the row. The
program must then check that none of the required seats is already reserved.
If the seats are invalid or already reserved, no reservation should be made and the
booking menu should be repeated to give the customer a further chance to book
seats.
If the reservation is successful, return to the main menu.
2. The user can also simply enter a row letter, eg B.IN this case, the program should
first check that the letter is a valid row and then offer the user in turn each
adjacent block of the required size in the specified row and for each ask whether
the customer wants to take them. Using the partly booked theatre layout above, if
the customer wanted 2 seats from row B, the customer should be offered first:
Seats B5 to B6
then if the customer does not want them:
Seats B10 to B11
and finally
Seats B11 to B12
If the customer selects a block of seats, then return to the main menu. If none are
selected, or there is no block of the required size available in the row, then report
that no further blocks of the required size are available in the row and repeat the
booking menu.
3. If the user enters a ? the program should offer the customer every block of seats
of the required size in the whole theatre. This process should start from the first
row and proceed back a row at a time. For example, again using the partially
booked theatre shown above, if the user requested 9 seats, the program should
offer in turn:
Seats A1 to A9
Seats C1 to C9
Seats C2 to C10
Seats E3 to E11
Seats E4 to E12
If the customer selects a block of seats, then return to the main menu. If none are
selected, or there is no block of the required size available in the whole theatre,
then report that no further blocks of the required size are available and repeat the
booking menu.
4. If the user enters a # the program should display the current status of the seating
in the theatre, exactly the same as for the T option from the main menu and then
repeat the booking menu.
5. If the user enters a 0 (zero), the program should exit from the booking menu back
to the main menu. If for example the user wanted 9 seats and no block of 9 was
left in the theatre, he would need to make two separate smaller bookings.
The program should perform limited data validation in the booking process. If a single
character other than 0, ? and # is entered, it should be treated as a row letter and then tested
for falling within the range of valid rows, eg A to H in the example above. Any invalid row
letters should be rejected.
If more than one character is entered, the first character should be tested as a valid row letter,
and the numeric part should be tested for falling within the given row. You are NOT
required to test for valid numeric input as this would require the use of Exception handling.
You are provided with a class file:
Pad.java
containing methods that can be used for neat alignment of the seat identifiers in the theatre
plan.
File Processing
The file to be read must be opened within the program and if the named file does not exist, a
FileNotFoundException will be generated. It is desirable that this Exception be caught and
a corrected file name should be asked for.
This is not required for this assignment, as Exception handling has not been covered in this
Unit. It will be acceptable if the method simply throws IOException in its heading.
The only checking that is required is to make sure that the user does supply a file on the
command line, containing details of the performance. This can be tested for by checking the
length of the parameter array args. The array length should be 1. If not, display an error
message telling the user the correct way to run the program and then terminate the program
System.exit(0);
The file should be closed after reading is completed.
Program Requirements
You are expected to create at least three classes in developing a solution to this problem.
There should be an outer driving class, a class to represent the theatre performance and its
bookings and a class to represent a single row within the theatre.
You will also need to use arrays at two levels. You will need an array of Rows in the Theatre
class.
Each Row object will need an array of seats to keep track of which seats have been reserved.
Your outer driving class should be called BookingOffice and should be submitted in a file named BookingOffice.java
Your second, third and any additional classes, should be submitted in separate files, each
class in a .java file named with the same name as the class
I am also very sorry to give such a long description.but i mainly want to know how to approach for this program.
also how to designate each row about it's column while it is being read from the text file, how to store it, how to denote first row as row A(second row as row B and so on) and WHICH CLASS WILL PERFORM WHICH OPERATIONS.
pls do give a rough guideline about designing each class and it's reponsibilty.
thanking u and looking forward for your help,
sincerely
RK

yes i do know that........but can u ppl pls mention
atleast what classes shud i consider and what will be
the functions of each class?No, sorry. Maybe somebody else will, but in general, this is not a good question for this forum. It's too broad, and the question you're asking is an overall problem solving approach that you should be familiar with at this point.
These forums are best suited to more specific questions. "How do I approach this homework?" is not something that most people are willing or able to answer in a forum like this.

Give a java program more resources...in JVM

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