Cant seem to manipulate System properties during runtime...

calling System.setProperty(...,...) has no effect whatsoever. is there a way around this?

ultimately, i'm trying to create a plugable component for my app. the said component is supposed to be able to read resources from its containing jar file. so i'm looking for a way to locate this file.
what i did was this: i created a custom class loader that loads classes from any valid location given it (on the local disk), my component calls
Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); and my class loader is called to do the job (though it delegates to the parent class loader).
Now not until i place the actual mssqlserver.jar, msbase.jar and msutils.jar files in a subdirectory of my app does it load correctly- apparently, one of the "ms" internal classes tries to load a resource from the msutils.jar cus i get this error:
Exception in thread "main" java.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Error opening/loading com.microsoft.util.transliteration.
properties.and i checked the msutils.jar and found a com.microsoft.util.transliteration.properties file in there.
My problem with this is that i dont want to have to keep dropping library files or files my apps depend on in subfolders. i want to be able to install these libraries or whatever once, then load them from this location, while they can still function completely.
thats my problem.
thanks in advance!

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Setting the Top and Left properties during runtime, depending on...

hi guys,
it's me again with the same question, but same scenario...
but probably with a bit clearer detail now...
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Can we manipulate the Show Horizontal Scroll Bar property during runtime?

Hi
i have set the Show Horizontal Scroll bar to true in the property palette during design time but i want to set to false during run-time based on certain conditions.
it is possible to set the Show Horizontal Scroll Bar property of the forms window to true or false during runtime?
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Hi there
thank you for the reply.
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No mapping during runtime!!

Hi all,
I got stucked with one problem in file-xi-idoc scenario using sap xi 2.0.
I am using sender file adapter which is picking up the file from ftp server. The file contains three fields and I am placing them in a text file as
Sriram,mumbai,in.
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<?xml version="1.0" standalone="yes" ?>
- <resultset>
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<field1>mumbai</field1>
<field2>in</field2>
</row>
</resultset>
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classname=com.sap.aii.messaging.adapter.ModuleFile2XMB
mode=FILE2XMB
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XMB.TargetURL=http://ht56f4:8000/sap/xi/engine/?type=entry
#XMB.SLDConfiguration = SLDaccessor7
XMB.User = xiappluser
XMB.Password = xipass
XMB.SenderBusinessSystem = PS_LEGACY
XMB.SenderInterfaceNamespace = http://ps_crm.com
XMB.SenderInterfaceName = Customer_out
#XMB.SenderBusinessSystem=ExtAdapterSender
#XMB.SenderInterfaceNamespace=http://sap.com/xi/xidemo
#XMB.SenderInterfaceName=ExtAdapterSenderIF
XMB.ContentKind=T
#XMB.ContentKind=T
#XMB.ContentType=application/xml
#XMB.ContentType=text/xml
XMB.ContentType=text/plain
XMB.QualityOfService=EO
#ftp server details
ftp.host = 10.1.45.43
ftp.port = 21
ftp.user = sapftp
ftp.password = ftp***sap123
ftp.connection = permanently
ftp.mode=Text
#file.sourceFilename = bank.txt
##File Adapter specific parameters (example, see docu)
file.sourceDir= \/pssap\/
file.sourceFilename = testing.txt
#file.processingMode=setAttribute
#file.processingMode=archive
#file.archiveDir=c:/temp_archive
file.pollInterval= 60
file.pollIntervalMsecs= 10
#file.retryInterval = 30
file.logPollInterval=YES
file.processingMode=delete
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#xml.fieldFixedLengths=8,9,2
xml.processFieldNames=notAvailable
xml.fieldSeparator=,
xml.enclosureConversione = YES
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Any suggestions greatly helpful.

Thanks,
found it.
Regards Mario

System.properties (what is the scope in memory)

Does each JVM have it's own System properties? Hence calls from one JVM System.getProperty() or System.setProperty() should be within each individual JVM? Also I need to know this so that I can gurantee that using the System properties for private information won't be accessed by anyone else on the system... Any input?

System properties are unique for each VM, they are therefore visible to all code running in the VM.
This seems like a good thing to use for storing things like passwords because of the global visibility however using the System properties for storing such things has to be considered as being insecure.
System properties should be regarded as a place to read data from that is relevant for either the Java runtime environment or for setting component specific properties, XML Parsers make use of this for example. Using System properties as an in memory database is neither secure nor sensible. Careless selection of keys for the properties you wish to store can have unexpected results if you accidentally overwrite a property that is used for other purposes.
I would use a separate Properties instance that has nothing to do with the System properties and I would also recommend the encryption of sensitive data like passwords.

Passing Java system property at runtime

How to set system property at runtime?
Imaging the situation - application is already run. One of the threads polls system properties periodically. In debug purposes I need to set system during program is working. How can I do that?

Not possible.
Far as I know not possible for any app (not just java) and true for most popular desktop OSes as well.
The environment is copied into the application (all applications) when it starts. So external changes will not impact it.

Is contextInitialized() blocked from setting System properties?

A certain 3rd party app we're using within a web app requires a specific System
property be set. Since it's a local path, we'd like to shy away from hardcoding
a -D into the startup script, and instead do it via a ServletContextListener and
set the property within contextInitialized(). In WL7.0sp2, it seems to hit the
line in our listener where it tries to set a System property, and nothing happens.
It doesn't seem to throw an exception, write anything to the console, nothing.
Is there a security setting that blocks contextInitialized() methods from setting
System properties? Is it a WL thing, or maybe a servlet spec thing? It works
if we use a dummy servlet set to pre-load, where we set the System property in
the servlet's init() method, but that's a little tackier than doing it in one
single context init listener.

Turns out the context-param that I was trying to use as the value of the System
property was null. When it sets a non-null value, it works. But apparently when
the value of the System property is null, you get the weird behaviour described
below: it's as if the tread just stops. I tried setting a breakpoint and stepping
through, but it immediately went into weblogic security and threading classes
and never returned. So now I'll have a new question about when context-params
load during deployment, but I'll post that separately.
"Mark Griffith" <[email protected]> wrote:
I don't know of any restriction. Your saying it never sets it? The
app
deploys but it is not there in the system properites?
Have you tried setting a break point and stepping?
Very strange.
mbg
"dave thompson" <[email protected]> wrote in message
news:3ecac0f8$[email protected]..
A certain 3rd party app we're using within a web app requires a specificSystem
property be set. Since it's a local path, we'd like to shy away fromhardcoding
a -D into the startup script, and instead do it via aServletContextListener and
set the property within contextInitialized(). In WL7.0sp2, it seemsto
hit the
line in our listener where it tries to set a System property, and nothinghappens.
It doesn't seem to throw an exception, write anything to the console,nothing.
Is there a security setting that blocks contextInitialized() methodsfrom
setting
System properties? Is it a WL thing, or maybe a servlet spec thing?It
works
if we use a dummy servlet set to pre-load, where we set the Systemproperty in
the servlet's init() method, but that's a little tackier than doingit in
one
single context init listener.

Where do I read in the documentation the list of the system properties?

Yep. Sounds stupid. But it's true. I read in all these forums where and how to set the truststore and so on but it would be beautiful to understand it my own.
1. First I read setting the -Djavax.net.ssl.trustStore in the VM arguments.
2. Then I find out the the -D is just for setting something like a static property.
3. Next I want to read about the system properties. Who, what and where the Java tries to get this system property. I do not find it.
What I find is great help in these forums and solving this kind of problems seems easy... I googled and the only place I found info about this is in a boulder.ibm.com site:
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/index.jsp?topic=/rzaha/sysprop2.htm
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/index.jsp?topic=/rzaha/rzahajssesysprops.htm
I also found some info on a sun tutorial but not an official documentation. Do you know where to find it? It seems that my learning is always about finding the right place to find information and not guessing and trying.
Thanks!!

Thanks for your soon reply. Yeah, I found that but I really was expecting a more serious documentation.
I have to admit that it is documented. Yes. But I didn't expect to find that in middle of a guide. But more in a reference or in a specification document. It's inside the "Customization" and in a table, yes... But it's a guide!!
I like Java but something to worry about is the "too many - too less" documentation. Documentation is not clear enough and all the hundreds of options you have can make the programming with Java no good. It would sound like a good thing have a lot of choices and hundreds of places to look info for but I am a bit disappointed with that. It's not clear enough to find the right info.
Anyway, thanks a lot for your help!! I will have to live with that.
Guide: http://java.sun.com/j2se/1.5.0/docs/guide/security/jsse/JSSERefGuide.html

Cant seem to manipulate System properties during runtime...

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