Java Application Calling C Library

I need to build a java app to call a C library. For the C library, all I have is some .lib, .dll and .h files. What should I do to achieve this goal to have my java app to call the methods in the C library? Please advise.

Also JNI

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user10827661 wrote:
My objective is to create a java application that's hosted on a server and called remotely from a PDA using TELNET.
I've created a java application using Eclipse & the jCurses library. Unfortunately, the jCurses API events and listener aren't enough and i wasn't able to achieve my target application functionality.
Can anyone advise a library other than jCurses that can help create a java application that can be called from a PDA via TELNET?
Is AWT an option ?Your server side Java application can use a Java library that
creates a java.net.ServerSocket to listen for TCP connections from TELNET clients.
You do not need any graphics (jCurses or AWT) on the server side, telnet is a simple ascii protocol.

How to call a AWT java application from TELNET ?

Dear All,
I've created a java Application using AWT, can anyone advise how it could be called using TELNET.
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Additionally, multi-posted to the Java Mobile sub-forum of this OTN site, as well.
How to create a java application & call it from a PDA via TELNET
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Java call C library?

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java code load C dll library?

Java can call C++ DLLs using JNI:
http://www-128.ibm.com/developerworks/edu/j-dw-javajni-i.html
%

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++++
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I created a java process which invokes another java application called Launch as shown below,
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Edited by: deepakchandaran on Sep 20, 2007 7:10 AM

You could search the forum and Google.
it has been answered before.
http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html

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Hi All,
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F:\JavaProjects\Calculator\dist>Java -jar Calculator.jar
Exception in thread "main" java.lang.UnsatisfiedLinkError: no CSharpClient in java.library.path
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.loadLibrary0(Unknown Source)
at java.lang.System.loadLibrary(Unknown Source)
at calculator.CalculatorApp.<clinit>(CalculatorApp.java:20)
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F:\JavaProjects\Calculator\dist>Java -jar Calculator.jar
*# An unexpected error has been detected by Java Runtime Environment:*
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*# Java VM: Java HotSpot(TM) Client VM (1.6.0_02-b06 mixed mode, sharing)*
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*# An error report file with more information is saved as hs_err_pid2640.log*
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If you are using VS2008, or VS2005, you can add a post build syntax like:
csc /t:module /out:"$(ProjectDir)$(OutDir)YourModule.dll" "$(ProjectDir)YourCSfile.cs"
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Help with calling a java application from inside another one

Hello!
I am having this problem which is getting on my nerves and dont know how to solve..
I want to call from my java application, another java application. So i use the exec command. Then i want to read the output of this execution from my own application, (the "parent" process).
But it doesn work properly. Something seems to happen and i dont get the whole output.
The java program i want to call is created for running an application created with Matlab java builder.
This program works when called from cmd, but seems not to work when called from inside a java application.
The code of my java application is:
Runtime rt = Runtime.getRuntime();
Process child;
// The java class getmagic is a special kind of java file that uses classes that work in matlab. It uses a component (.jar) file that is created from matlab java builder. thats why it wants the -classpath and the rest options.
//I hope you wont get messed up in here.
String[] callAndArgs = {"java","-classpath",".;C:\\Program Files\\MATLAB\\R2006b\\toolbox\\javabuilder\\jar\\javabuilder.jar;..\\MagicDemoComp\\magicsquare\\distrib\\magicsquare.jar -Djava.library.path=C:\\Program Files\\MATLAB\\R2006b\\bin\\win32;","getmagic","4"};
try{
child = rt.exec(callAndArgs);
InputStream is = child.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null)
System.out.println(line);
is.close();
System.out.println(child.waitFor());
System.out.println("Finished");
}catch(IOException e) {
System.err.println("IOException starting process!");
}catch(InterruptedException e) {
System.err.println("InterruptedException starting process!");
The java program (getmagic) thats uses matlab gives the following output (after some time) when called in cmd with argument 4
Magic square of order 4
16 2 3 13
5 11 10 8
9 7 6 12
4 14 15 1
My program shown above only prints:
Magic square of order 4
1
Finished.
Do i do something wrong? How can i get the rest of the output???
Thank you very much in advance,
Stacey
PS: I am sorry for the length of my post.

Hello CaptainMorgan08, thanx for the instant reply.
I tried, but no, i cant.
Because i cannot include this java aplication that uses matlab into my application, cause 1) it needs special arguments in the compiler and during execution so it can be run and 2) it uses classes that java doesnt have. only the java-like matlab code.
For example it uses:
import com.mathworks.toolbox.javabuilder.*;
import magicsquare.*; //the component which is made from matlab java builder.
So i cannot compile it with my application!
If you know of a way, please let me know!
I know i might be missing something.. something that is obvious to you.. but i ve been working days=nights hardly no sleep..so you can excuse me if i say something foolish..
Message was edited by:
Stacey_Gr

Can we call a webservice using standalone java application ?

Hi friends,
               Can we call configurd webservice in xi , using standalone java application by just giving url of webservice ?
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Regards .,
V.Rangarajan

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3) Create the mapping program accroding to your requirement.
Go through blogs of Bhavesh and Naveen which talks about calling webservice in a specific condition:
Webservice Calls From a User Defined Function - /people/bhavesh.kantilal/blog/2006/11/20/webservice-calls-from-a-user-defined-function
Consuming/Calling webservices from DataBases - /people/sap.user72/blog/2005/10/20/consumingcalling-webservices-from-databases
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https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/336365d3-0401-0010-9884-a651295aeaa9
Cheers..
Vasu
<i>** Reward Points if found useful **</i>

Example-- Call RFC from external Java Application

Update: I need code example to call RFC from External Java application. Can onybody help me?
RGDS
RP
hi all.
i want to create my own log for each interface.
i saw this blog:
/people/michal.krawczyk2/blog/2006/09/20/xi-abap-mapping-logs--more-standard-better-visibility
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Rgds.
Message was edited by:
        Rodrigo Pertierra
Message was edited by:
        Rodrigo Pertierra
Message was edited by:
        Rodrigo Pertierra

Hi,
Oh, you are using ABAP mapping ......
then use the following in ABAP mapping ..
TRACE1,TRACE2,TRACE3.... for trace level 1,2,3......
http://help.sap.com/saphelp_nw04/helpdata/en/ba/e18b1a0fc14f1faf884ae50cece51b/content.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5c46ab90-0201-0010-42bd-9d0302591383
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/866ce290-0201-0010-338f-b8c3553aaa0f
Regards
Chilla

Multi-threaded java application and deadlock down in Oracle library

Hello,
I was running our Java (JDK 1.6_14) application from Windows XP hitting an Oracle (10g) instance on Linux and came across a deadlock issue with two (of 10) threads. Below is the stacktraces (based on Java thread-dump at the command line). This code I've run 30-40 times with no problems of deadlocks.
The Oracle library that we're using for our Java application is ojdbc14.jar and sdoapi.jar (for spatial).
We create our Connection as follows (for each thread -- 10 of them):
public class Worker implements Runnable
private Connection _Conn;
public Worker(...)
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
_Conn = DriverManager.getConnection(url, username, password);
_Conn.setAutoCommit(false);
The code that is already executing these same lines below was already executed by other threads (in their own instance of Worker). So this is very confusing.
Any ideas? Version of the .jar files? Place how we're calling "DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());"?
Thanks, Jim
Found one Java-level deadlock:
=============================
"WORKER_1":
waiting to lock monitor 0x02b50d8c (object 0x22e8af80, a oracle.jdbc.driver.T4CConnection),
which is held by "WORKER_0"
"WORKER_0":
waiting to lock monitor 0x02b50d24 (object 0x22f6d258, a oracle.sql.StructDescriptor),
which is held by "WORKER_1"
Java stack information for the threads listed above:
===================================================
"WORKER_1":
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3410)
- waiting to lock <0x22e8af80> (a oracle.jdbc.driver.T4CConnection)
at oracle.sql.StructDescriptor.initMetaData1_9_0(StructDescriptor.java:1516)
- locked <0x22f6d258> (a oracle.sql.StructDescriptor)
- locked <0x22eabd80> (a oracle.jdbc.driver.T4CConnection)
at oracle.sql.StructDescriptor.initMetaData1(StructDescriptor.java:1408)
at oracle.sql.StructDescriptor.isInstantiable(StructDescriptor.java:892)
at oracle.sql.STRUCT.<init>(STRUCT.java:148)
at oracle.spatial.geometry.JGeometry.store(JGeometry.java:2954)
at oracle.spatial.geometry.JGeometry.store(JGeometry.java:3777)
.......... <our package/class>
"WORKER_0":
at oracle.sql.StructDescriptor.initMetaData1_9_0(StructDescriptor.java:1494)
- waiting to lock <0x22f6d258> (a oracle.sql.StructDescriptor)
- locked <0x22e8af80> (a oracle.jdbc.driver.T4CConnection)
at oracle.sql.StructDescriptor.initMetaData1(StructDescriptor.java:1408)
at oracle.sql.StructDescriptor.isInstantiable(StructDescriptor.java:892)
at oracle.sql.STRUCT.<init>(STRUCT.java:148)
at oracle.spatial.geometry.JGeometry.store(JGeometry.java:2954)
at oracle.spatial.geometry.JGeometry.store(JGeometry.java:3777)
..........<our package/class>
Edited by: Jim Atharris on Aug 24, 2009 6:23 PM

Thanks Toon for your reply.
Yes each Worker (executing in their own thread) has their own instance of Connection as per the Constructor (shown in original post). That is why this is weird.
I'll check the v$session when I get into work.
Based on our code that I put in the original email, Connection is a non-static variable. We have a per Thread per instance of Worker of which that Worker instance has its own instance of Connection. So I'm wonder if the following needs to occur:
Both of these lines (from original email) need to happen in the main thread as follows:
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
for (i=0;i<NUM_OF_WORKERS)
_Conn = DriverManager.getConnection(url, username, password);
new Worker(_Conn);
Thanks,Jim

How can i call a jasper report from a java Application

Hi,
i am chiranjit , currently i working in a web based ERP project, in this project as a report building tool we are using JasperReport wih eclipse plugin . in eclipse report's are generating very well but i am unable to call that report from a java application because i have no idea about the How to call a Jasper Report from a Java Application . so please send me the necessary class names, jar files names and programe code as early as possible.
Chiranjit

Ahh, kind of a duplicate thread:
http://forums.java.sun.com/thread.jspa?threadID=631642
@OP. You could have clarified your original post and the relationship of your question to java. You did not need a new thread.
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Java Application Calling C Library

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