Does java have default exception handler or something

Hi,
I am getting a lot of SQLExceptions in my project, and I am fed up with try/catches everywhere in my project. I am doing exactly the same in every catch.
So I was wondering if there is any way of default error handling, so if noone catches this exception, this will catch it.
I know it excists in VB.NET.
thanx guys!
Bart

Look at Thread.UncaughtExceptionHandler

Similar Messages

Why does Java have such a large footprint?

I've been curious about this topic for a while, but I haven't ever looked into this to any depth. I also posted this to stackoverflow but haven't gotten any solid responses so far:
http://stackoverflow.com/questions/1107991/why-does-java-have-such-a-large-footprint
Java - or at least Sun's Hotspot JVM - has long had a reputation for having a very large memory footprint. What exactly is it about the JVM that gives it this reputation? I'd be interested in a detailed breakdown: how much memory goes to the runtime? (The JIT? The GC/memory management? The classloader?) Anything related to "auxiliary" APIs like JNI/JVMTI? The standard libraries? (Which parts get how much?) Any other major components?
I realize that this may not be straightforward to answer without a concrete application plus VM configuration, so just to narrow things down at least somewhat: I'm primarily interested in default/typical VM configurations, and in a baseline console "Hello world" app as well as any real-world desktop or server app. (I'm suspecting that a substantial part of the JVM's footprint is largely independent of the app itself, and it is in this part that I'd like to zoom in, ideally.)
I have a couple of other closely related questions:
Other similar technology, such as .NET/mono, don't exhibit nearly the same footprint. Why is this the case?
I've read somewhere on the intarwebs that a large portion of the footprint is due simply to the size of the standard libraries. If this is the case, then why is so much of the standard libraries being loaded up front?
Are there any efforts (JSRs, whatever) to tame the memory footprint? The closest thing I've come across is a project to reduce the on-disk footprint of the JVM [1] and to modularize the standard library [2].
I'm sure that the footprint has varied over the past decade or so with every new version of Java. Are there any specific numbers/charts chronicling precisely how the JVM's footprint has changed?
[1] http://blogs.sun.com/jtc/entry/reduced_footprint_java_se_bringing
[2] http://blogs.sun.com/theplanetarium/entry/project_jigsaw_modularizing_jdk_7

yangzhang wrote:
I've been curious about this topic for a while, but I haven't ever looked into this to any depth. I also posted this to stackoverflow but haven't gotten any solid responses so far:
http://stackoverflow.com/questions/1107991/why-does-java-have-such-a-large-footprint
Java - or at least Sun's Hotspot JVM - has long had a reputation for having a very large memory footprint. What exactly is it about the JVM that gives it this reputation? I'd be interested in a detailed breakdown: how much memory goes to the runtime? (The JIT? The GC/memory management? The classloader?) Anything related to "auxiliary" APIs like JNI/JVMTI? The standard libraries? (Which parts get how much?) Any other major components?
Presumably versus some other VM. I would suppose the fact that much of the VM is written in java has something to do with it.
I realize that this may not be straightforward to answer without a concrete application plus VM configuration, so just to narrow things down at least somewhat: I'm primarily interested in default/typical VM configurations, and in a baseline console "Hello world" app as well as any real-world desktop or server app. (I'm suspecting that a substantial part of the JVM's footprint is largely independent of the app itself, and it is in this part that I'd like to zoom in, ideally.)
I have a couple of other closely related questions:
Other similar technology, such as .NET/mono, don't exhibit nearly the same footprint. Why is this the case?
Not sure I agree with that. What size do you see with a .Net app that uses 3.0/3.5?
I've read somewhere on the intarwebs that a large portion of the footprint is due simply to the size of the standard libraries. If this is the case, then why is so much of the standard libraries being loaded up front?
Good question. There is a feature that allows multiple VMs to use the same memory footprint version of the loaded libraries. That is a new feature and it isn't clear to me if it covers the entire API. I do not know if that is dynamically built.

Default Exception Handling in B2B

Hi All,
Need your help and advise on the below requirement we have currently:
Source system sends an XML input to MW and therein, we transform it into PO_850 XSD and sends it to B2B. We are validating the XSD in B2B and then generating an EDI_PO_850 file and sending it to the Trading Partner. We are going to have 5 different Target Trading Partner. I have 2 questions w.r.t the default exception handling in place for Oracle B2B:
1. Which Queue will have the Error Information for the above case? B2B_IN_Queue/B2B_OUT_Queue/B2B_IP_IN_Queue
2. We would like to consume the error messages specific to a trading partner from the JMS Queue directly, how can we achieve it?
Appreciate your help in this regard.
Thanks in Advance
Priyanka

Hi Priyanka
B2B operates in two modes for default internal queue communication - AQ and JMS. This is controlled in the Admin/Configuration page "use JMS queues" checkbox.
In AQ, the queue to which the exception message is delivered would be IP_IN_QUEUE
In JMS the queue to which the exception message is delivered would be B2B_IN_QUEUE. Since you speak about reading error message from the JMS queue directly, am thinking this would be the one of interest to you.
In addition to the above we can create custom JMS internal delivery queue and this can be associated to the Exception Queue which can be assigned in the Admin/Configuration page.
With regards to reading the exception msg specific to the trading partner from the JMS Queue directly, this can be done by adding a check on the dequeue process. Each exception message is populated with From_Party and To_Party information. In the outbound delivery case, the exception message should have To_Party set as the partner's name. This can be checked.
Hope that helps.
Regards
Arun

Does Java have APIs for statistical analysis?

Hi Java Experts
I want to develop a Java program which can help users to analyse their stock investment. Here I have two questions
1) How can I wrap my finished Java program as a XXX.exe? So users can install my program by executing it
2) Does Java have any APIs for statistical analysis?
Thank you very much for your help!
ViolaIT

1) How can I wrap my finished Java program as a
XXX.exe? So users can install my program by
executing ithttp://onesearch.sun.com/search/onesearch/index.jsp?qt=java+exe&qp_name=null&subCat=siteforumid%3Ajava54&site=dev&dftab=siteforumid%3Ajava54&chooseCat=javaall&col=developer-forums

Does java have picture box?

I am newbie in building gui with java. just migrate from using vsstudio.
I see people use matisee to dragndrop things
but what i want to know now. is
does java have picturebox? and can i set location of each component like
x.setLocatioN(x,y) on form?
ummm, .. is it good to use matisee?
thks

Hi. What do your initials stand for, Tom Hanks Kevin Susan?
You can use a JLabel to show a graphic in Java. Use its setIcon method.
You can use setBounds to position components, but you must set the layout of the parent component to null using setLayout. However, it is recommended not to do this, as it isn't very flexible. Instead, learn about and use [url java.sun.com/docs/books/tutorial/uiswing/layout/using.html]layout managers.
I've never used Matisse.

Default exception handling

Hi,
Is it possible to define multiple error-pages for exceptions such that some of them process specific exceptions and one processes the all others;
<error-page>
<exception-type>MyException</exception-type>
<location>/MyExceptionHandler</location>
</error-page>
<error-page>
<exception-type>java.sql.SQLException</exception-type>
<location>/SQLExceptionHandler</location>
</error-page>
<error-page>
<exception-type>java.lang.Exception</exception-type>
<location>/DefaultExceptionHandler</location>
</error-page>
All the locations map to servlets/jsps, MyException derives from java.lang.Exception.
Is such a configuration possible? If yes what am I doing wrong?
Thanks.

Hi Priyanka
B2B operates in two modes for default internal queue communication - AQ and JMS. This is controlled in the Admin/Configuration page "use JMS queues" checkbox.
In AQ, the queue to which the exception message is delivered would be IP_IN_QUEUE
In JMS the queue to which the exception message is delivered would be B2B_IN_QUEUE. Since you speak about reading error message from the JMS queue directly, am thinking this would be the one of interest to you.
In addition to the above we can create custom JMS internal delivery queue and this can be associated to the Exception Queue which can be assigned in the Admin/Configuration page.
With regards to reading the exception msg specific to the trading partner from the JMS Queue directly, this can be done by adding a check on the dequeue process. Each exception message is populated with From_Party and To_Party information. In the outbound delivery case, the exception message should have To_Party set as the partner's name. This can be checked.
Hope that helps.
Regards
Arun

Does java have any class that wrap byte[]

my program would send byte[] to remote host;I know byte cant be serializabled;
so I would a class wrap byte[],I cant write new class,because remote host maybe havent this class,
I want to kown if java have a class that wrap byte[];

The iPlanet Application Server 6.5 has a very nasty bug when you're using RMI/IIOP: if you want to reference an EJB in a stand-alone application. you can't use reliably methods that take parameters whose type is an array of primitives (like byte[]). The EJB can be called correctly in a Web application or by another EJB, but you can't use them in stand-alone apps.
It is a product that is simultaneously a C++ application server and a Java application server, and has lots and lots of native code. It uses a specially modified JRE 1.3 for its own use.
Sun dumped it (too buggy, too complex, too slow and very oddball) and used the J2EE SDK RI code instead to write the new versions of Sun ONE Application Server and Sun Java System Application Server.

Can i create Default Exception Handler ?

hello how can i create a default handler for all exceptions witch are thrown from all actions from all backing beans.
i want to redirect a user to userfriendly page when some uncatched exception has been created.

Hi JOKe,
I have the same problem with JSF, have you found a solution?
Thanks in advance
David

Does java have strong names?

Hi,
I am a .net developer also interested in Java. I would like to know if Java provides something similar to Strong names in .net.
Thank you.

I have another question, pls guys dont mind about posting it in the same thread. I did not want to clutter the forum.
If I have two interfaces like this:
Interface A{
void getMethod();
Interface B{
void getMethod();
If I have a class implementing these two interfaces:
Class C implements A,B{
//I will not be able to give implementation for both the methods in java here
But I can do it in .net. I do not understand why java does not provide this or what is the advantage of having it in .net?
I can do it in .net like this:
the two interfaces would be like this:
Public Interface a
Sub getMethod()
End Interface
Public Interface b
Sub getMethod()
End Interface
the class can implements bot these interfaces with the same method signature:
Public Class c
Implements a, b
Public Sub agetMethod() Implements a.getMethod
End Sub
Public Sub bgetMethod() Implements b.getMethod
End Sub
End Class
I can write a class which can invoke the specific methods without ambiguity:
Public Class k
Public Sub New()
Dim atmp As a = New c()
Dim btmp As b = New c()
atmp.getMethod()
btmp.getMethod()
End Sub
End Class
If I want to do it in java, how do I do it? please educate me on this.
Thank you.

Why does Java have so much trouble with deleting files

So, I've been doing alot more code on the file-level and have been noticing that Java is really terrible at deleting files. This should be rather straightforward, but the delete method can fail in so many ways, it's unbelievable. Even with taking special care to close all streams, it will sometimes just not do it, or even return a "Yes I've deleted it" result and the file is still there! (deleteOnExit() suffers the same affliction)
This problem is even scuttling the otherwise trusty Ant, which is really annoying. Ever seen this? "BUILD FAILED: Could not delete 'myproject.jar'" So any Ant-driven automated build-and-test process can fail because of this super-avoidable error. (We have to code a pre-build-jar-deletion shell script, which is annoying when jars are added/deleted/renamed for whatever reason.)
Does anyone know the reason for this? I'm really curious.
Maybe, in 1.5, they will come out with "File.crushAndDestroyWithMercilessPrejudice()". I'd use it all of the time! :)

I had the same problem when I was working with JAI. I had about a half million images that I made a viewer for, which would allow our users to do away with microfiche. Project worked great, but the files wouldn't delete off the user box (Win2K). I checked everything and they just would not delete--windows would not acknowlege the resources had been released by Java.
I finally took a lesson from MS developers and said: "It's not a bug, it's a feature!" I wrote it into the manual that it was a cache feature and would speed-up access to the images, yet delete the old ones (which it did, any images that were not accessed during the session would delete just fine, while any that were accessed would still be there next time for local access rather than hitting the network for them. The cache turned out to be one of the great features of the application.
On the other hand, I've not had any problems deleting files from Linux.

What Net Capabilities Does Java Have?

I have learned two other programming languages before learning Java and now I have learned a lot of the syntax of Java. I need to know if this is possible:
Is there a way for me to get an HTML document from the internet from a specified URL on an HTTP server? If this is possible, can I search through it, possibly with FileReader? If Java does have a function that I could use to do this could someone please tell me what it is and what class it's from?
thanks,
lateralus

The URL class will be helpful. It is described here:
http://java.sun.com/javase/6/docs/api/java/net/URL.html
URL's openStream() method might be a good place to start. There is an example of
its use at "The Java Developers Almanac 1.4" here:
http://www.exampledepot.com/egs/java.net/ReadFromURL.html?l=rel
And there is lots on Networking in Sun's Tutorial:
http://java.sun.com/docs/books/tutorial/networking/index.html
These three locations could well serve as your first port of call with many "Is there a
way..." type questions.

Does Java have a built in XML parser?

Hi, does the JDK come with a built in XML parser? If so, from what version onwards is this available?
I'm looking at this article here:
http://www.devx.com/xml/Article/16921/0/page/3
So, I presume the answer is yes, Java comes with JAXP. I'm using JDK 1.6, does that come packaged with JAXP?
Thanks.
Rupert

rupertlssmith wrote:
Hi, does the JDK come with a built in XML parser? If so, from what version onwards is this available?
I'm looking at this article here:
http://www.devx.com/xml/Article/16921/0/page/3
You need to add three jar files--jaxp.jar, crimson.jar, and xalan.jar--to your CLASSPATH.xalan and jaxp have been in the Sun Java SDK since at least 1.4.
crimson existed in the Sun Java 1.4 SDK apparently replaced by xerces from Sun Java 1.5 SDK.

Does pacman have a verify mode or something similar?

I took my arch drive and an old pata drive to my dad's machine because my machine doesn't have any pata ports (just got a new one) and I needed to get stuff off the old drive. I unplugged my dad's hard drive and plugged my drives in, but did so without realising the machine was asleep and not actually off. So there goes windows trying to wake up. 2 seconds later it BSODs and writes a memory dump to the drive, which I think may have broken my system somehow because now after rebooting my dad's machine and copying over all the files I need (had to boot to arch on my flash drive) I brought my arch drive back to my machine and now /sbin/init won't start because it is "accessing a corrupted shared library" and that causes a kernel panic ("tried to kill init"). So I've now booted off my arch flash drive again and mounted my arch drive in the hopes of fixing it. So I need some way of getting pacman to reinstall everything somehow, and I was hoping there was a command line switch like other package managers have that will verify any packages installed on the system.
TL;DR I somehow broke some library on my machine and now I get a kernel panic on boot because init is accessing a corrupted shared library, and I need to use pacman to hopefully reinstall that library.
My plan was to just pacman --root /mnt -Syy && pacman --root /mnt -Syu but I don't think that's sufficient.
EDIT: I tried reinstalling glibc, that gave an error about libreadline being corrupt so I tried to reinstall that, that threw an error about libncursesw.so.5 being corrupt, so I reinstalled that. That finally ran fine, but now when trying to reinstall readline it upgrades according to pacman then says "command failed to execute correctly". I also just tried pacstrap /mnt base base-devel and my screen is now being spammed by some weird characters. Think it's a format and reinstall for me
Last edited by biltong (2012-09-08 14:43:25)

No, I have no idea what it was spamming (looked like %059 or something like that, or a slash with a bunch of numbers that just kept repeating) but no kernel panic. Loads of library errors though.
I've now got pacman --root /mnt -Syf base base-devel running which is redownloading all the packages just in case. If all these libraries are broken it probably means all the others are broken too, which means I'm pretty much reinstalling anyway. I only installed arch 2 days ago, lol.
EDIT: Still not working, loads of library errors and "cannot execute binary file" errors. All of these things should have been overwritten by pacman, so this is probably a disk error or something. I ran fsck before everything and that corrected some stuff but it's still broken somehow. I'll just have to format and reinstall I suppose.
Last edited by biltong (2012-09-08 16:16:40)

Does Java have a control like CListCtrl in VC++

I have seen an application developed in VC++ with items displayed in heirarchial manner or listed like tree in a CListCtrl control.
Can a similar customization be done in Java.
Regards,
Arun
[email protected]

In Microsoft visual Studio, VC++ applications they
have a user control
List Ctrl.CListCtrl is a class specific to MFC not Visual Studio or VC++.
Is there any simiilar controls in Java.JList.

Does Java have any class for linear algebra/matrix computation

Hi!
I am new to Java. Would like to ask whether Java provides any class or package for linear algebra/matrix computation, before I switch to MATLAB or write the code by myself.
Thank you

Maybe you can find something here,
http://math.nist.gov/javanumerics/

Does java have default exception handler or something

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