Java exec question

If i start a command with java exec and i want to terminate the command from running how to i do this?
what i am doing now is i wait 5 seconds and if there is no output from the command i ask for exitValue() which throws an exception which i catch.
This causes my main function to exit, but my two command output readers threads continue to read because the process is still alive.
How do i kill the process? i tried to use destroy but its depreciated. Thanks in advance for the help.

Tommaso wrote:
I got my self so confused with depreciated methods like stop()Again, there is a significant difference between depreciated and deprecated.
http://www.thefreedictionary.com/Depreciated
http://www.thefreedictionary.com/Deprecated

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Unable to call getVariableData from java exec

Hi,
I am trying to call getVariableData("inFile") from a java exec. However, I get the following error:
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com.collaxa.cube.engine.types.BPELFault: faultName: {{http://schemas.oracle.com/bpel/extension}javaException}
messageType: {{http://schemas.oracle.com/bpel/extension}javaException}
code: {null}
summary: {null}
detail: {null}
at com.collaxa.cube.engine.ext.wmp.BPELXExecWMP.__executeStatements(BPELXExecWMP.java:66)
at com.collaxa.cube.engine.ext.wmp.BPELActivityWMP.perform(BPELActivityWMP.java:154)
at com.collaxa.cube.engine.CubeEngine.performActivity(CubeEngine.java:3215)
at com.collaxa.cube.engine.CubeEngine.handleWorkItem(CubeEngine.java:1636)
In the .bpel file, I have declared the variable as follows:
<variable name="inFile" type="xsd:string"/>
I have assigned values to this variable in two different ways (using the assign tag and also through a java exec call):
<assign>
<copy>
<from expression="'inFile.txt'"/>
<to variable="inFile"/>
</copy>
</assign>
OR alternatively:
setVariableData("inFile", new String("inFile.txt"));
After this I attempt to call (this is the part that throws the error):
CubeDOMElement el = (CubeDOMElement) getVariableData("inFile");
The strange thing is that I am able to get the variable from inside an assign activity as follows:
<assign name="setOutputVars">
<copy>
<from expression="bpws:getVariableData('inFile')"/>
<to variable="output" part="payload"
query="/outputMessage"/>
</copy>
</assign>
This assign works perfectly and outputs the correct value.
Any suggestions would be greatly appreciated.
Thanks.

I have a similar problem, but I try to retreive a complex object.
The assign activity successfully copy data to the variable 'DMSPollingInput'.
Here is my code:
Element element = (Element) getVariableData("DMSPollingInput");
System.out.println("Receive Poll and execute enqueue ");
if(element==null) System.out.println("element is null ");
else System.out.println("element is not null ");
IDmsPollingsCollection requests =
IDmsPollingsCollectionFactory.createFacade(element);
if(requests==null) System.out.println("requests is null ");
else System.out.println("requests is not null ");
List dmsPollings = requests.getIDmsPollings();
int count = dmsPollings.size();
System.out.println("Poll size: " + count);
The count always equals to 0.
Please help

Flash/java remoting question

Hi,
i'm new to flash remoting and am finding using it with java
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I will use the program with photo detector to test
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XML Parser Error in bpel java exec code

hi,
When BPEL PM is loading processes from the deploy directory, the following exception is thrown. Any thoughts on why this XML error is being thrown ? Also, this problem is not consistently reproducible.
Thanks,
Ravikiran
bpel<Line 232, Column 72>: XML-24523: (Error) Invalid value 'NotifyFoo' for attribute: 'name'.
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39,0-1 10%

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Can I post here(Acrobat Windows) Java Script questions here?

Hello
Can I post here(Acrobat Windows) Java Script questions here? If not, wht is the correct forum?
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Back up and down to Acrobat Scripting. Bot Windows and MacIntosh Acrobat versions use the same JavaScript.
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Java Pinging question

Hi
First if all, I hope this is the correct place to post such question..My apologies if that is the case.
Anyway, like a lot of other people, I'm trying to implement a Ping mechanism in Java. I have read some of the available suggestions and none really solves the problem.
One idea is to use JNI...this is against what I am trying to achieve as I want to implement a pure java ping.
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I know Java is not low level enough to deal with such things, is there no way around it?
I hope have have explained myself here. I would be greatful for any ideas, or suggestions. It is a bit frustrating, as I have been scratching my head for the whole day trying to get this little thing solved.
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Sjasja,
Thank you for your reply.
I'm actually trying to implement a pure java webcrawler, as I'm learning about java networking at the moment. While the crawler is working fine..I also need to include more functionalities, for example while crawling the program could obtain statistics on quality of service of a particular site - possibly through ping time of a give domain. By quality of service, I want to include things such as the quality of the network between my machine and the host, for example the response time of a site (the ping), the success rate of udp packets etc, and possibly more..sort like a network diagnose function.
HTH
Thanks alot

Plzzz write prog to this simple java threads question

Write a program in C to create four processes. The original processes creates
two children before it prints out "PARENT". The children processes print
"CHILD1" and "CHILD2" respectively. The first child process creates a child
process that prints out "GRANDCHILD".
Note: The output must be guaranteed to print out in the following order each
time it is executed:
GRANDCHILD
CHILD2
CHILD1
PARENT
a. Write the program using C or C++ and forks to create the children processes.
b. Write a second program using Java and Threads for the children processes.
The output statements for CHILD1, CHILD2 and GRANDCHILD must come from print
statements in the run method of the thread.

Most people here will not do your homework for you. If you post a reasonable question that shows you've made some effort, and what the results of that effort were, and provides details about what parts you're having trouble with, then somebody will probably provide guidance so that [you can complete the work.

Simple Java Coding Question

I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
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My first thought was that they meant to look at the position in the array one less (or more) than i (j). But that doesn't seem to be the case. A is an array of Strings, if that matters...
Thanks for you help.

muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
a[--i] and a[++j] mean.
It mean increase/decrease the int i/j by 1. This is done before it gets you the value of a[]. for example if i=5 and you said a[--i] it is really a[4] and i is now equal to 4;

Simple Java EJB question.

When it comes to EJB v3 Remote and Local interfaces,
(With JBoss EJB Container Software in mind, for this question,)
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muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
a[--i] and a[++j] mean.
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Simple Java Sound Question...

Can I draw waveforms while capturing data? If yes, how. If no, why.
Thanks. I need the answer ASAP, please help.

Hi nfactorial,
Can I draw waveforms while capturing data?If you would like to do that in Java you would need to know about how to use the Java language in general and especially about the Java Sound and Java2D APIs.
If yes, how.It would be too much to explain to answer such a general question. A general answer is, you need to use the Java Sound API to capture the data for which a waveform should be drawn. The Sound API delivers data as a stream of bytes typically encoded in pulse coded modulation (PCM) format. The data stream has digital samples each representing a level of sound pressure for a certain point in time. The stream of samples in the amplitude/time domain need to be transformed to a spectrum of samples in the amplitude/frequency domain, i.e. a number of PCM samples need to be mapped to the frequencies that should be displayed. This is done with the fast fourier transformation algorithm. Each set of amplitude/frequency values can then be displayed as a waveform by using some line drawing logic. The entire process would need to run constantly, i.e. as bytes are received from the sound data stream transformation and drawing is triggered.
Related readings:
Java Tutorial
http://java.sun.com/docs/books/tutorial/
Java Sound Documentation
http://java.sun.com/j2se/1.5.0/docs/guide/sound/index.html
Java Sound API Programmer's Guide
http://java.sun.com/j2se/1.5.0/docs/guide/sound/programmer_guide/contents.html
Java Sound Resources
http.//www.jsresources.org
Java 2D Graphics Tutorial
http://java.sun.com/docs/books/tutorial/2d/index.html
Wikipedia on fast fourier transformation
http://en.wikipedia.org/wiki/Fast_fourier_transform
HTH
Ulrich

Simple java pgm - question

Hallo,
to the following pgm I had question:
static void printPrimes (int max) (= wavy bracket;
boolean(should be angular brackets) sieve = new booolean (angular br max+1
angular br)
int i,j;
for (i=2; i = max;i++)sieve(angluarbr i angular br)= true
i= 2
while (i= <= max;) (=wavy bracket Out.println (i+ " "); // is prime
for (j=i; j <= j+i) sieve(angular br j angularb.) = false;
while (i <= maxAmpersandAmpersand !sieve (angular br angular br)I++;
) wavy br ) wavy br.
I hope this is still kind of readable.
Q's are:
after the first "for" there is a new i=2, which seems to staty at 2 all the time; the following while does not change this value ( the beginning for i++ does not change this) and so seems to print 2 at all times (??)
then the inner loop seems to count up all the doubbles of the new prime number and thrwoes it out as false at the end of it;
the i values (increased with i++ seemsto refere at all times to the unit numbers and only indirect to the un it values, which are written/ assigned to it (??)
I seem to wonder how the pgm can print out anythings else the 2's.
I would appreciate any help to that.
ml
griz

I hope this is still kind of readable.No, it's not. http://forum.java.sun.com/help.jspa?sec=formatting
Why are you omitting the braces and brackets? And why don't you type "program"? Aren't we worth the additional time it takes?
Q's are:
after the first "for" there is a new i=2, which
seems to staty at 2 all the time; the following
while does not change this value Why should it? You don't tell it to.
( the beginning for
i++ does not change this)It does. It just gets re-set to 2 after the for loop-
and so seems to print 2 at
all times (??)Yeah. What else?
then the inner loop seems to count up all the
doubbles of the new prime number and thrwoes it out
as false at the end of it; That part is definitely unreadable.

Java exec spawns command window

Hello,
I am using JRE 1.4.2 (Eclipse runtime environment). Whenever I execute the following command:
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Is there any way to prevent this command window from appearing. I have chained all Error and Output streams within the java program but no luck. I guess the only other solution is to not make the exec calls by making native calls from the java program, but that would be a huge undertaking.
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Yes, I think you are correct.
When I do the same with say calc.exe or notepad.exe, I do not get this dos command prompt.
The command that I am trying to execute here is PCLI.exe (for PVCS). Do you have an idea of how I can deal with this program so that I do not get that annoying comand prompt?

Importing Java Class Question

Hello,
Sorry for such a newbie question and such a long post, I did remember how to do this before but now I can't for the life of me remember. Anyhow, I have a simple question about importing custom-made java classes, from another directory in the windows operating system. I have the classpath set, and also I realize that because the two files below are in the same directory theres no need for an import statement as Java will look for the class in the same directory.
But I would like to know how the import statement is suppose to look to import a custom made java class from another directory, (assuming of course that I set the correct classpath)
here's the java class location:
c:\school\csc365\narcus.java
//narcus.java
import java.io.*;
class narcus implements Comparable
String firstName = "firstName";
String lastName = "lastName";
     public narcus()
     firstName = firstName;
     lastName = lastName;
     public narcus(String f)
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     lastName = lastName;
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     lastName = l;
public String getFirst()
return "first..";
     public int compareTo(Object e)
     return 1;
Here's the location of the driver program thats suppose to use the narcus.java class
c:\school\csc365\test.java
//test.java
//import statement? maybe import "c:\\school\\csc365\\*"; ?
import java.io.*;
class test
public static void main(String[] args)
     narcus jim = new narcus();
     System.out.println("omg\n");
     System.out.println(jim.getFirst());
And also, here is my classpath:
PATH=c:\school\csc365\;c:\school\
The classpath also points to the jdk libraries and few other directories but I didn't write that above, as it probably isn't relevant.
I've tried the following import statements.
import "c:\\school\csc365\\narcus.java";
import "narcus.java";
import "c:\\school\\csc365\\*";
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test.java:1 <identifier> expected
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Hi Folks,
I am new to this forum, heard that interesting discussions always happens on this forum so immediately registered,don't want to miss any oppurtunity to participate in discussions.
I have pretty much basic question regarding compiling and exceuting files in different packages.I have the following directory structure
C:\Projects\WDPROEast\Development\CommonService\Code\Java from where java files stored in different packages as follows:
com\wdpro\commerce\common\crm\dae\nautilus\adapter directory has java files in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package.
com\wdpro\commerce\common\dae\exception has java files with package named com.wdpro.commerce.common.dae.exception.
com\wdpro\commerce\common\dls\exception has java files with corresponding package name.
com\wdpro\commerce\common\dto has java files under proper package name.
com\wdpro\commerce\common\exception has java files with appropriate package name.
com\wdpro\commerce\common\util has java files with package name. I am starting at Java Directory,want to compile and run file named a.java in com.wdpro.commerce.coomon.crm.dae.nautilus.adapter package with having all other java files on classpath as follows
so I issued command for compilation as follows C:\Projects\WDPROEast\Development\CommonService\Code\Java>javac com/wdpro/commerce/common/crm/dae/nautilus/ada
pter/a.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/NautilusServiceUtility.java com/wdp
ro/commerce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/
b.java com/wdpro/commerce/common/dae/exception/*.java com/wdpro/commerce/common/dto/*.java
com/wdpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dl
s/exception/*.java It compiled greatly but when I issue command to run a.class file as
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
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Exception in thread "main" java.lang.NoClassDefFoundError: com/wdpro/commerce/common/crm/dae/nautilus/adapter/
UtilityAccesssbut when I run a.java with the following command
C:\Projects\WDPROEast\Development\CommonService\Code\Java>java com/wdpro/commerce/common/crm/dae/nautilus/adap
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merce/common/crm/dae/nautilus/adapter/URLReader.java com/wdpro/commerce/common/crm/dae/nautilus/adapter/Nautil
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dpro/commerce/common/exception/*.java com/wdpro/commerce/common/util/*.java com/wdpro/commerce/common/dls/exce
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I hope you understand my question,pass me any comments you may have.
Thanks alot,
Anu

Java Programming Question

Hi,Everybody:
I have a question about Java programming. If I want to write a java class code called if.java like below, how should I do to make it pass the java compiler and make it work. I know the words "if" and "for" are reserved words. I just try to figure it out that is it possible??? Do I need to create my own java compiler or recompiler?
public class if
public if() { }
public static for test()
return new for();
public class for
public for() { System.out.println("for class constructor"); }
}

I don't think you can bypass the compiler's rejection of this. There is little point to naming the classes after keywords. Not sure if it's case sensitive though, so maybe "If" or "For"? Otherwise, try "if_" or "for_"

Java Interview questions!!!!!!!!!!!!

Hi folks,
I had an interview with a small company a few days ago.
Below is a list of the questions that they asked me.
Some of these are not familiar to me at all.
Does anyone have the answer for these?
(1) Draw UML diagrams that express the following concepts:
(a) Class C and class B are subclasses of class A.
(b) Class P has two private fields int x and int y and one
public method setXY(int x1, int y1)
(c) bob is and object of class Bob.
(d) Class A objects contain one or more objects of class B.
(e) Interface A is implemented by class B and class C.
(2) Define the following computer science terms:
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(b) type conversion
(c) narrowing / widening a type.
(d) reference type
(e) type casting
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(b) (2pts) Explain the difference between method hiding and
overriding methods.
(c) Give an example of marker interface.
(d) Suppose class A implements two interfaces C and D. Each of these
has a method public void getRichQuick() but C's method
throws CaughtBySECException and D's method throws
AntitrustException. What will the compiler do?
(4) (a) With respect to subclassing what does restriction mean?
(b) How do we implement restriction in Java?
(c) Suppose we have two interfaces in Java: I2 which extends
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not?
(d) What is multiple inheritance?
(e) Give a way to achieve the effect of multiple inheritance in Java.
(5) (a) In a Java class definition what is an initialization. Give an
example.
(b) Give the order in which the following three things would be
initialized when a subclass B of class A is created:
(i) an explicit initializer in B, (ii) an explicit initializer
in A, and (iii) an initalization statement in a constructor of A.
(6) (a) On what methods and classes should one use /** ... */ comments?
(b) For javadoc to detect these comments where relative to these
methods/classes should the comment occur?
(c) Explain how to use each of the following javadoc tags:
(i) @since (ii) @see (iii) @param
(7) Define the following terms with respect to their object-orientation
meaning. Give an example of (b) and (c).
(a) framework
(b) idiom
(c) design pattern
(8) Give each of the things needed for the canonical form for public classes
in Java.
(9) Class A and Class B each contain identical blocks of code 30 lines long.
Class A extends Class C and Class B extends Class D. Suggest a way to
avoid the code duplication using factorization. What kind of
factorization did you use?
(10) Give the UML diagrams for the folowing design patterns:
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I think I can help you with a few points:
2
a. Primitive types are byte, short, char, int, long, float, double and boolean. They tell the compiler the type of the variable and thus how much memory needs to be set aside to store the variable in memory.
b. Converting from one type to another which kinda links in with c. Widenening is the process of changing, for example and byte to an int (no explicit cast is needed) because a byte (8 bits) can fit into an int (32 bits).
However the reverse is not true (obviously) so an explivit cast is needed to tell the compiler that you meant to do it (as information can be lost).
e.g. int i = 3000;
byte b = (byte)i;
obviously a byte can only hold values up to 127 so converting this int to a byte changes the value. You have to look at the bits and understand a bit of binary code for this.
This kinda answers part e. too.
d. A reference type is a pointer to a cariable or object (I think thats what its getting at). eg int i = 32; i is a reference to the memory address where the computer stored the value 32.
4d.e Multiple inheritance is when a subclass inherits from more than one base class. In java this is not possible (java only supports single inheritance with the extends keyword). However, java overcomes this with interfaces as a class, although it can only extends one base class, can implement as many interfaces as it likes in a comma seperated list.
I hope this helps you on your way. The fact of the matter is, the majority of your questions can be found in any decent book on java (and UML). Also look at the java tutorial online.
For example 1a is simply a box with two other boxes beneath with arrows pointing upwards to the base class (not downwards as would seem reasonable).
The best way to learn all this stuff is to read it then try it yourself! That way you'll remember it much better.
Good luck

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