Java

Re: How can I use relative path in java to read a file ?

30-Jun-10 0:11

Hello Guys

Do u know how can i set system properties of jvm in which i can specify the path.We can set it thru Project properties then under run in vm options

With -D and after that what we have to write?

Any Ideas?
Regards
Yogesh

Richard MacCutchan30-Jun-10 1:28

Re: How can I use relative path in java to read a file ?

30-Jun-10 1:28

java -D"property=C:/dir/subdir" class

Your program can now find the value of 'property' through the java.util.Properties class.

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Richard MacCutchan30-Jun-10 1:24

Re: How can I use relative path in java to read a file ?

30-Jun-10 1:24

Take a look at

System.getProperties().list(System.out);

this will give you a list of all the default system properties, so you can figure out where your file should be stored so you can address it with a relative path.

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002comp30-Jun-10 1:51

Re: How can I use relative path in java to read a file ?

30-Jun-10 1:51

Hello Sir

I setted System properties of jvm with -DservPath=c:\test
And when I tried to get property,it is returning null. I tried like this

Properties prop = new Properties();
String path = prop.getproperty("servPath");

And like this too

String Path = System.getProperty("servPath");

I want to tell u that this file is not in jar file,this is out of jar file that i want to load.
In both cases,it is returning null.
Its looking like i am very near.
What happening Now sir?

Regards
Yogesh

Richard MacCutchan30-Jun-10 2:23

Re: How can I use relative path in java to read a file ?

30-Jun-10 2:23

yogeshs wrote:

Properties prop = new Properties();

That can never work as you are creating a new Properties object which will be empty. The value will be inserted into the System.Properties and you should be able to obtain the value by

String path = System.getProperty("servPath");

which works in my test. You may want to check you are making your java call correctly like this

java -DservPath=c:\test [jar or class name ]

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002comp30-Jun-10 2:54

Re: How can I use relative path in java to read a file ?

30-Jun-10 2:54

Hello sir
I dont know whats happening.When i print system properties then its showing mine property in list but when I am getting thru System.getProperty("servpath") giving null.

And I am setting -DservPath=c:\test\test.jar in Netbeans Project properties dialog under Run section in VM options.

I appreciate for ur time.
Regards
Yogesh

Richard MacCutchan30-Jun-10 3:52

Re: How can I use relative path in java to read a file ?

30-Jun-10 3:52

I use Eclipse rather than NetBeans and it works when running in the Eclipse IDE and also from the command line. However in your post above:

System.getProperty("servpath")

-DservPath=c:\test\test.jar

Do you notice the difference in the spelling between "servpath" (lower case 'p') and "servPath" (upper case 'P').

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002comp30-Jun-10 17:49

Re: How can I use relative path in java to read a file ?

30-Jun-10 17:49

Yeah,I am aware about spelling of servpath.That is by mistake here in posting only not in my code.

Thanks & Regards
Yogesh

Richard MacCutchan30-Jun-10 21:28

Re: How can I use relative path in java to read a file ? [modified]

30-Jun-10 21:28

yogeshs wrote:
That is by mistake here in posting only not in my code.

That's why we have Copy/Cut & Paste!

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002comp30-Jun-10 18:14

Re: How can I use relative path in java to read a file ?

30-Jun-10 18:14

Hello Sir

I found one thing that when I enable Web Start configuration In NetBeans then it is not showing servPath but when I uncheck Enable Web Start(means default configuration) then it is showing the value of servpath.

What could be the reason?am I missing anything else?
Thanks & Regards
Yogesh

modified on Thursday, July 1, 2010 12:30 AM

Richard MacCutchan30-Jun-10 21:27

Re: How can I use relative path in java to read a file ?

30-Jun-10 21:27

Sorry, I have no experience of NetBeans, so I cannot suggest anything. However you mentioned Web Start, so I suspect this is not a standard Java app and perhaps the properties in Web Start are handled in a different manner.

It's time for a new signature.

002comp30-Jun-10 22:09

Re: How can I use relative path in java to read a file ?

30-Jun-10 22:09

ok,Anyway,thanks for your precious Time.
Regards
Yogesh

002comp1-Jul-10 1:43

Re: How can I use relative path in java to read a file ?

1-Jul-10 1:43

Hello Sir
Actually In Windows I am using this code to find the path of running jar file:

File ff =new File(classname.class.getProtectionDomain().getCodeSource().getLocation().getPath());
String jarFilePath = ff.toString();

Now when we hosted the site on Linux server then it is not showing the full path.Its showing only the name of jar file.

Is there way to get full path of jar that is on Linux server.

Thanks & Regards
Yogesh

anand kr25-Aug-10 16:41

anand kr

25-Aug-10 16:41

Yogesh,

If you are talking about reading a resource from relative path with respect to current class, consider using this snippet:-

1) getClass().getResource("url") which will give you URL instance which can be used to read a resource
2) getClass().getResourceAsStream("file or any other resource") which returns an InputStream

anand in dnr

Heap space option -xms and -xmx

002comp22-Jun-10 19:40

22-Jun-10 19:40

Hello Friends

I am creating a Executable jar file using NetBeans.In Project properties under Run I was setting -Xms1024m -Xmx1024m and it was loading file whenever i click on executable jar file.And virtual memory for c drive also setted in paging section from 1024 to 1024.

Now,I want to load a big file and this executable jar is not working.So,I increase virtual memry first to 2048 to 2048 and then in my project properties I setted to -Xms2048m -Xmx2048m but it is not loading.Do I need to make any other changes to load any big file?

Any Ideas guys.
Thanks In Advance.
Regards
Yogesh

Cedric Moonen22-Jun-10 20:22

Cedric Moonen

22-Jun-10 20:22

First thing to do is verify what the problem is, not trying to make assumptions. Did you get an exception ? If yes, copy the stack trace here so that we can have a look. If you don't have enough memory, you should get a memory exception.

Cédric Moonen
Software developer

Charting control [v3.0]
OpenGL game tutorial in C++

002comp22-Jun-10 20:53

22-Jun-10 20:53

Hello Sir
It is giving error:
Exception in Thread :java.lang.outofmemoryerror :java heap space.

i setted virtal memory to 4096m
And in Netbeans isetted to -Xms2048m -Xmx2048m

Thanks For ur Reply
Regards
Yogesh

David Skelly22-Jun-10 22:33

David Skelly

22-Jun-10 22:33

The first thing to be aware of is that if you are running under Windows, you won't be able to use much more than 1Gb of memory for your Java heap space (certainly true for 32 bit, may be different for 64 bit Windows). The reason is that the Sun JVM requires heap memory to be allocated contiguously (in other words, in one big continuous block of memory). Because of the way Windows loads DLLs into memory, Windows can't normally allocate contiguous blocks of memory bigger than roughly 1 gig (off the top of my head the figure that springs to mind is 1.2Gb but that may be wrong). You can do things like shuffling DLLs around but even then you don't get a lot more and it's probably not worth the effort. Things may be different with 64 bit Windows, I don't know because I've not worked with it very much yet. Things may also be different with other JVMs (I used to use JRockit 5 years ago with WebLogic and that was the same at the time, but I believe that now it no longer requires contiguous memory and so does not suffer from this problem.)

But I would turn this question around: what are you doing that is blowing so much memory so quickly? It sounds to me as if there is something amiss here and instead of throwing more memory at the problem, maybe you could reconsider your design?

002comp22-Jun-10 22:53

Re: Heap space option -xms and -xmx (More Detailed way)

22-Jun-10 22:53

Hello David Sir
Actually the design demands for this type of memory requirement.I have to load a file dynamically with initialisation whose size is around 3.5MB.
But If I load file around 1mb then its working.So to load heavy file I increased the heap space to 2048 then it is not running even thru netBeans,error comes like

Could not create the Java virtual machine.
Error occurred during initialization of VM
Could not reserve enough space for object heap
Java Result: 1

Thanks For ur reply.
Any Ideas?
Regards
Yogesh

002comp23-Jun-10 0:56

Re: Heap space option -xms and -xmx (More Detailed way)

23-Jun-10 0:56

Any Other Ideas Guys??????
I think i made it very confusing.let me Explain u in better way.

The Simple thing is that When I set Heap Space -Xms1024m -Xmx1024 then its working fine. But As I increased to -Xms2048m -Xmx2048 then when I try to run thru NetBeans even It gives me the Error:

run:
Error occurred during initialization of VM
Could not create the Java virtual machine.
Could not reserve enough space for object heap
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)

What do i Need to change to increase Heap Space.

And If I run thru batch file in which I specify
java -Xms512m -Xmx1024m -jar sample.jar

Thanks & Regards
Yogesh

David Skelly23-Jun-10 1:45

David Skelly

23-Jun-10 1:45

Re-read my earlier post. On a Win32 platform, you will not be able to allocate more than about 1.2Gb for the heap size.

Question: What do I need to change to increase heap size?
Answer: The operating system

You say that you are having a problem loading a 3.5Mb file into 1Gb of heap space. Something is not right there. What are you doing with this file that is causing it to consume so much memory?

Re: Heap space option -xms and -xmx (More Detailed way) [modified]

002comp23-Jun-10 2:00

Re: Heap space option -xms and -xmx (More Detailed way)

23-Jun-10 2:00

Ok,i agree with u that I cant give more than 1.2gb heap size on win32 OS But When I run thru Batch file then How it load the same 3.5Mb file?

Yeah,I am reading and parsing that file.

One last Question:What is the difference between running viewer through NetBeans and Running through Directly jar file?How it loads in both way?Any Documentation or If u know tht would b much better.

Thanks & regards
Yogesh

modified on Wednesday, June 23, 2010 8:20 AM

David Skelly23-Jun-10 3:28

David Skelly

23-Jun-10 3:28

What "viewer" are you talking about and what kind of file is this that you are parsing?

And are you now saying that you can load this file if you run it via a batch file as opposed to running it within NetBeans?

Re: Heap space option -xms and -xmx (More Detailed way)

002comp23-Jun-10 17:42