Networking a java program

I'm interested in creating a java program that will run on a webserver and will be used by 4 different people interactivly, like a card game. I have created java programs before but never for a network environment and never used by more than one person at a time. could anyone point me in the right direction as to what i need to do to create this interactive network program?
thanks

well ur looking at two things. First of all, u need threading for ur program to have the ability to be used simulaneously by more than 1 person. and then u need to learn how to network program I can only suggest some books to learn network programming and I am sure you can find a lot on threading in most java books. Let me know if you wanna know the books, i can't remember the names at this point

Similar Messages

Running a java program over network

Hi,
How a java program on a machine can be run without having JRE on the same machine, rather interpreting bytecode over network having JRE on another machine?

Rahul.Kumar wrote:
well, so my java program is running on x. Initialy X had JRE and on invoking java program from command prompt, it had looked for JRE at path, set in environmental settings. Now I moved JRE to another machine Y and connected these two machines (X and Y). You have two machines X and Y.
"Connected" or not has nothing to do with this discussion.
In X path is set to the JRE on Y. The path on X has absolutely nothing to do with anything on Y.
Now execute java program on X, theoretically it should work or what is wrong with this?This makes no sense. Presuming you meant Y in the above then the following must be true.
1. You must have a JRE on Y.
2. You must have a java application on Y (or one accessible via the file system on Y.)
3. You must be on Y and start the JRE passing the java application that is on Y to it.
Notice in the above there is no mention of X. There can be no mention of X.

How can java programs execute automatically when it connects to network

Good Day dears...
How can java programs execute automatically when it connects to network.
Thanks in Advance friends Shackir

884924 wrote:
Good Day dears...
How can java programs execute automatically when it connects to network.What is "it"? That is, execute when what connects to the network?
Your computer? If that's what you mean, this is not a Java question. It's an OS operational/administrative question. Executing any program, whether written in Java or not, based on some system event has to do with that system, not with the program. If it's possible to do this, you'd do it exactly the same way for a Java program as you would for any other program.
Or is "it" the program itself? If this is what you mean, then it's a nonsensical question. For the program to connect to the network and detect that it has connected to the network, it must already be executing, so asking how to execute it at that point is meaningless.
Finally, I'll point out that "connecting to the network" is a pretty meaningless phrase. Or rather, it has so many potentially valid meanings that it's impossible to know which one you're referring to when you use that phrase. And I'd be willing to bet you don't have a clear picture of that yourself.

Running a Java Program for every shut down of system

Hi
I have a java program that sends an email to the Admin of my network.
But this is program i just want to execute for every shutdown and on of my system
Please Tell me how to execute my java program at system shutdown time and on time..
Thanks

Despite your objective, this is not a Java issue. The real question is "How does one run a program just before system shutdown?"
How you execute such an application is system dependent. Java doesn't know when the system shuts down, only when the JVM shuts down. Unless you're willing to have JVM running the entire time the system is up, you'll need native code to detect system shutdown & launch the notification app.

How do I establish a connection to another Java program on the net?

Hi all,
I have been reading the java tutorial to find a solution to my problem but I havent really found what Im looking for.
I want to establish a connection that allows a client to get a copy of an object from a running java-application on a server on the internet.
I have read about the Socket-class but the tutoral advices only to use it on a locale network. I know IDL and RMI only by name - is this what I should be reading about?
If one of you guys have a source-code example on how to make java programs communicate over the net, please post it!
Regards Albert

Assuming this is "wide area" stuff, not just on a local area network, your best bet is to stick to http connections. You need a web server, probably Tomcat.
Your client can connect using URL.openConnection().
As to protocols you could use SOAP. It has the advantage that you can get the code for it for free, but it can be pretty complicated to configure. In particular it only knows how to transmit a limited set of object types and if you want to go beyond them you have to write converters. SOAP servers typically run under an web server anyway. SOAP converts all the data to XML for transmission.
However it may be simpler to use Java's built in serialisation facility and send your data as an ObjectStream.
In the set up you're talking about the message going to the server seems a lot simpler than the response. It may make sense to send your data as normal keyword parameters of a POST transaction but to have the server respond with an Object stream. That's well within the normal operation of a web server.

Java-Program for JCO-Connection

Hallo experts!
I tried to get a Java-Program running which should establish JCO-Connection to a SAP-System and got the following error message:
java.lang.ExceptionInInitializerError: JCO.classInitialize(): Could not load middleware layer 'com.sap.mw.jco.rfc.MiddlewareRFC'
JCO.nativeInit(): Could not initialize dynamic link library librfc. Found version "640.0.144" but required at least version "640.0.161".
     at com.sap.mw.jco.JCO.<clinit>(JCO.java:776)
     at JCOTEST.main(JCOTEST.java:24)
Exception in thread "main"
Anyone got an idea?
Thanks for your help in advance.

Thank you Jens,
it worked fine with the newest JCo-Download.
Now I seem to have some Network problem: ip not reached:
com.sap.mw.jco.JCO$Exception: (102) RFC_ERROR_COMMUNICATION: Connect to SAP gateway failed
Connect_PM GWHOST=10.251.24.10, GWSERV=sapgw10, ASHOST=10.251.24.10, SYSNR=10
LOCATION    CPIC (TCP/IP) on local host
ERROR       partner not reached (host 10.251.24.10, service 3310)
I need to talk to our network manager in the firm.
Regards.
Thomas

Running java program at windows startup

I need to run java program at startup and then it will continue to run in its own thread.
Any body having idea how to do that programmatically?
Zeeshan

This is one option but this is not feasible in my scenario as this application will be running over a network which involves hundreds of computer so is there any way to do it programatically?
I mean if I can load java class file through an exe file then I can load my class file in the startup using C++.
Any Suggestions.
thanks for the help
regards,
Zeeshan

Error in ONS logs while implmenting FCF on oracle RAC from java program

I have java prog on client machine that uses properties from a property file.While making the connection to the ONS port on the oracle RAC server to implement FCF the program is throwing error as below:
java.sql.SQLException: Io exception: The Network Adapter could not establish the connection
and when i checked the ons logs for that node the logs are as follows:
Connection 5,199.xxx.xxxxxx,8200 header RCV failed (Connect
ion reset by peer) coFlags=1002a
These logs are generated only when java program tries to connect else the daemon started without any errors.
But sometime it connets and gives the desired output.
Please advice and do let me know in case you need more information.
Java program on the client machine is as follows..
* Oracle Support Services
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Enumeration;
import java.util.Properties;
import java.util.ResourceBundle;
import oracle.jdbc.pool.OracleConnectionCacheManager;
import oracle.jdbc.pool.OracleDataSource;
public class FCFConnectionCacheExample
private OracleDataSource ods = null;
private OracleConnectionCacheManager occm = null;
private Properties cacheProperties = null;
public FCFConnectionCacheExample() throws SQLException
// create a cache manager
occm = OracleConnectionCacheManager.getConnectionCacheManagerInstance();
Properties props = loadProperties("fcfcache");
cacheProperties = new java.util.Properties();
cacheProperties.setProperty("InitialLimit", (String)props.get("InitialLimit"));
cacheProperties.setProperty("MinLimit", (String)props.get("MinLimit"));
cacheProperties.setProperty("MaxLimit", (String)props.get("MaxLimit"));
ods = new OracleDataSource();
ods.setUser((String)props.get("username"));
ods.setPassword((String)props.get("password"));
ods.setConnectionCachingEnabled(true);
ods.setFastConnectionFailoverEnabled(true);
ods.setConnectionCacheName("MyCache");
ods.setONSConfiguration((String)props.get("onsconfig"));
ods.setURL((String)props.get("url"));
occm.createCache("MyCache", ods, cacheProperties);
private Properties loadProperties (String file)
Properties prop = new Properties();
ResourceBundle bundle = ResourceBundle.getBundle(file);
Enumeration enumlist = bundle.getKeys();
String key = null;
while (enumlist.hasMoreElements())
key = (String) enumlist.nextElement();
prop.put(key, bundle.getObject(key));
return prop;
public void run() throws Exception
Connection conn = null;
Statement stmt = null;
ResultSet rset = null;
String sQuery =
"select sys_context('userenv', 'instance_name'), " +
"sys_context('userenv', 'server_host'), " +
"sys_context('userenv', 'service_name') " +
"from dual";
try
conn = null;
conn = ods.getConnection();
stmt = conn.createStatement();
rset = stmt.executeQuery(sQuery);
rset.next();
System.out.println("-----------");
System.out.println("Instance -> " + rset.getString(1));
System.out.println("Host -> " + rset.getString(2));
System.out.println("Service -> " + rset.getString(3));
System.out.println("NumberOfAvailableConnections: " +
occm.getNumberOfAvailableConnections("MyCache"));
System.out.println("NumberOfActiveConnections: " +
occm.getNumberOfActiveConnections("MyCache"));
System.out.println("-----------");
catch (SQLException sqle)
while (sqle != null)
System.out.println("SQL State: " + sqle.getSQLState());
System.out.println("Vendor Specific code: " +
sqle.getErrorCode());
Throwable te = sqle.getCause();
while (te != null) {
System.out.print("Throwable: " + te);
te = te.getCause();
sqle.printStackTrace();
sqle = sqle.getNextException();
finally
try
rset.close();
stmt.close();
conn.close();
catch (SQLException sqle2)
System.out.println("Error during close");
public static void main(String[] args)
System.out.println(">> PROGRAM using JDBC thin driver no oracle client required");
System.out.println(">> ojdbc14.jar and ons.jar must be in the CLASSPATH");
System.out.println(">> Press CNTRL C to exit running program\n");
try
FCFConnectionCacheExample test = new FCFConnectionCacheExample();
while (true)
test.run();
Thread.currentThread().sleep(10000);
catch (InterruptedException e)
System.out.println("PROGRAM Ended by user");
catch (Exception ex)
System.out.println("Error Occurred in MAIN");
ex.printStackTrace();
Some of the info i have deleted intensionally as this is confidential
Property file is as follows
# properties required for test
username=test
password=test
InitialLimit=10
MinLimit=10
MaxLimit=20
onsconfig=nodes=RAC-node1:port,RAC-node2:port
url=jdbc:oracle:thin:@(DESCRIPTION= \
(LOAD_BALANCE=yes) \
(ADDRESS=(PROTOCOL=TCP)(HOST=RAC-node1)(PORT=1521)) \
(ADDRESS=(PROTOCOL=TCP)(HOST=RAC-node1)(PORT=1521)) \
(CONNECT_DATA=(service_name=RAC_SERVICE)))

Hi;
Please check below note:
Link Errors While Installing CRS & RAC Database software [ID 438747.1]
Codeword File $TIMEBOMB_CWD,/opt/aCC/newconfig/aCC.cwd Missing Or Empty [ID 552893.1]
Regard
Helios

How to use java programe in oracle form

Hello Expert,
My Config is : -
Forms [32 Bit] Version 11.1.1.3.0 (Production)
Jdeveloper - 10.1.3
I want to use the java programe in form builder. I create the one java class in Jdeveloper -
package demo;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
public class get_info{
   public static void main(String[] args){
   ch_add();
   public static void ch_add()
InetAddress ip;
try {
ip = InetAddress.getLocalHost();
/*System.out.println("Current IP address : " + ip.getHostAddress()); */
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
byte[] mac = network.getHardwareAddress();
/*System.out.print("Current MAC address : ");   */
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++)
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
System.out.println(sb.toString());
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e){
e.printStackTrace();
and this into Formweb.cfg and default.env and also add into Form_class_path. After that i import this java into forms.
Code genertated -
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
Now i want to call the o/p of Java programe in oracle text item. Please help me. It's very urgent. I am not good in Java.

Sir i use java importer.
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
I read both document which is given by you.
Basicaly i don't know how to call java program in form builder.
I wrote this code on When-button-pressed
DECLARE
jo ora_java.jobject;
rv varchar2(1500);
ex ora_java.jobject;
BEGIN
jo := get_info.new;
rv:=get_info.ch_add(jo );
EXCEPTION
WHEN ORA_JAVA.JAVA_ERROR then
message (' Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR );
message('');
WHEN ORA_JAVA.EXCEPTION_THROWN then
ex := ORA_JAVA.LAST_EXCEPTION;
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
END;
No error comes and no output comes. I want the client MAC ID. please guide me where i need to change the code.

How to automlog into webside using username and password using java program

I am trying to log in to a website using password and username. What libraries i can use. I searched online and came to know that i can use Apache's commons HttpClient library to do that. I am new to this please let me know what can i use.
For starting purpose i wrote this code:
public static void main(String[] args) throws URIException {
     try {
          HttpClient client = new HttpClient();
          GetMethod method = new GetMethod("http://www.google.com");
               int returnCode = client.executeMethod(method);
               System.err.println(method.getResponseBodyAsString());
          method.releaseConnection();
          } catch (HttpException e) {
               e.printStackTrace();
          } catch (IOException e) {
               e.printStackTrace();
but this is giving me an error. please see below,
java.net.UnknownHostException: www.google.com
     at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
     at java.net.PlainSocketImpl.connect(Unknown Source)
     at java.net.SocksSocketImpl.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at java.net.Socket.connect(Unknown Source)
     at java.net.Socket.<init>(Unknown Source)
     at java.net.Socket.<init>(Unknown Source)
     at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80)
     at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122)
     at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707)
     at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387)
     at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
     at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
     at com.verizon.zoeott.ingest.PropertyFileReader.main(PropertyFileReader.java:48)
Another thing is that we use proxy to get internet connection. In internet explorer-->internet options-->LAN Settings-->using automatic configuration script to connect to the internet.
I don't know how to configure this into java program. please help.
Thanks,
amol
Edited by: 877846 on Jan 20, 2012 9:16 AM
Edited by: 877846 on Jan 20, 2012 9:21 AM

Also please let me know about how to connect internet through proxy server.As I said above, if you are using the Apache HTTP client, no we can't, as this is not an Apache forum. I also told you where to find that answer.
If on the other hand you don't want to use that client any more, setting the system properties http.proxyHost and http.proxyPort will do it for java.net.HttpURLConnection. See the Java Custom Networking tutorial for examples.

Java Programming Contest

Theres a world java programming contest running on http://www.logical-magic.com . This is of special relevance to those specialising in Java network programming. The first prize is a Ferrari sports car.
Those who are interested can check it out.

Getting that Ferrari to India will be a pain.
Unless u know to do something like Sachin.
Thanks for the tip anyway.
Rgds,
Seetesh

Call Java program in APEX

Hi, I am an APEX newbie... I need to call a Java program (.JAR file) from a PL/SQL script inside an APEX application. My question is, does the JAR file need to be in a particular place (and if so, what's the best way to get it there)?
- somewhere in the APEX database?
- somewhere in the production database (9i)?
- could it be called if it resides on a shared network drive?
Any help would be appreciated... everything I've found thus far tells me to use the loadjava tool to get it onto the prod. database, but I want to make sure that there isn't an easier option as I've had some trouble with that.
Thanks in advance...
Kenny

Hi,
If you want to call the method of the java class that is stored in the jar you have to make this jar file accessible to the client.
1/ The jar file can be stored in the database by using loadjava utility
E.g. loadjava -u scott/tiger -resolve yourjavapackage.jar
More details on http://www.oracleutilities.com/OSUtil/loadjava.html
and http://www.csee.umbc.edu/help/oracle8/java.815/a64683/tools1.htm
1.1/ Once the jar file is in the database you can access it's object methods by defining the pl/sql function that is able to call particular java method
E.g.
FUNCTION jCreateDir (dir varchar2, checkExistsOnly number, grantRootDir varchar2)
RETURN NUMBER as LANGUAGE java
NAME 'mypkg.Utils.createDirectory(java.lang.String, int, java.lang.String) return int';
Above function then calls the java method defined in the class included in the jar file (jar file is just an archive of the java classes - to bundle several classes, images... in one file)
The example contents of the java class
package mypkg;
import java.io.File;
public class Utils {
public static int createDirectory(String dir, int checkExistsOnly, String grantScriptDir)
///some code here
1.3/ So if you know what method to call, what are the input parameters and return value you can create your calling procedure/function in pl/sql
I am not very sure if you can load jar files containing the classes that render some user interface items(buttons,panels etc - items from awt or swing package) so basicaly load just the code that performs actions like computation/ xml transformation/ file I/O so anything that does not require GUI items.
2/ If your jar file contains the objects that display some user interface control or you need to call the java from the javascript then you need to embed your jar file in the html code by using <OBJECT > or <APPLET> tag
Re: Open program in FF
Rado

Java program in XP - Please Help

Hi, I am not sure if I am in the right fourm. I am not a developer, but a network engineer trying to help out my wife. My wife uses a java program to monitor the company she works for web site, which is not linked to a web browser. When she received the java program, it came with Java 1.2.2. Our PC had Windows 98 installed. I purchased a new machine, with Windows XP on it, and installed the java program and JRE on to it. The program does not work. The programmer who wrote the program was fired a few months ago, so I started looking through the internet, and the Sun fourms for a solution. First, the XP machine does not have Microsoft VM on it. Second, I upgraded the java to 1.4.1_02, following the instructions, still with no success. There was a suggestion to dual boot with Windows 98, but I really do not want to do that. What happens is - when you log in to the program, it just freezes. It does not go into the server. Any help is greatly appreciated.

Possible reasons for the program hanging up
1) The version of the VM on the machine is not correct.
2) Even if the version is correct and correctly installed, can you please check whether the PATH and CLASSPATH variables are set correctly on the machine where you are running the program.
3) I use WINXP as well with the latest version of VM downloaded from Sun and NOT Microsoft.
Hopefully this might solve the issue.

How To Get A Java Program To Initiate Auto Dial in Windows???

I have a Java program that opens a connection to a server (another Java program) using sockets and streams. On some windows machines (various versions) with auto dial enabled the connection is made without human intervention. However on some windows machines (even same as others) the autodial doesn't work and all I receive is NoRouteToHostExceptions.
What I need is some way of initiating the autodial from within Java explicilty rather than assuming that the OS will do it when a request is made to a remote IP address.
I emplore anyone with some knowledge of this to provide assistance as I am going nuts trying to solve this problems.

A long time ago I figured out how to create, find, and manipulate items in the DialUp Networking using an InstallShield program. I am sorry I can't remember specifics (I wouldn't have even replied except no one else has either...) but I remember that I did a LOT of hunting on Microsoft's website for how to do this on the various platforms of the day (Win95, Win98, NT4.0).
I imagine that in order to accomplish this from java, you will probably need to find the system-specific commands (at Microsoft) and exec them from your java program.
/Mel

Java program - over the net arguments

Hi Friends,
I have a java program that accepts inputs as agruments and produces a result file eg:
java MyProgram input1.wav input2.wav output.wavThe program works fine if the input files are on local computer but i want the input files to come over the internet eg:
java MyProgram http://www.xyz.com/input1.wav http://www.xyz.com/input2.wav http://www.xyz.com/output.wavCan someone please tell me how to do this. I tried to make a servlet that calls this java program but it didn't worked...
Please give me some ideas as to how to implement this..
Thanks

I would like to make an API, so that when the program
gets the parameters,it automatically downloads and
processes them and then provides the output file??
Do,I need to establish a HTTP connection to that
server first from which I need to access the files???Have a look at Sun's lesson: Working with URLs:
http://java.sun.com/docs/books/tutorial/networking/urls/index.html

Networking a java program

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