Loading local Java program when Applet is started

Okay, I am trying to write a Java applet that is used as an online scheduler for one of the professors in the college I work at (I am also a student so I haven't taken a lot of programming classes but know networking and GUI's for Java)
I was going to set up the program to connect to a server that is always running locally to save the information for the scheduler but my boss does not want something running all the time. Is there any way to start a program (and check if the program is running) on the local host? I would need to be able to start the program when someone connects, and be able to connect to the currently running program if a second user connects. Is this possible? Any help would be appreciated. Thank you.
Stephen

Define "does not want something running all the time". I mean, if you are serving an applet, you are running a web server all the time. If you are running a web server, it'd be trivial to run a MySQL database and have the applet just use JDBC to talk to the database (so long as the DB is running on the same machine as the web server, you shouldn't have to worry about signed applets). Then can both be configured to start automatically if the machine is rebooted.
Granted, connecting to a database from an applet is probably not very secure, becuase the password would be fairly exposed to people that know what they are doing. So one way around this is to run some CGI or JSP/servlets or something in the web server that the applet can talk to, which in turn handles the database connection.

Similar Messages

Calling oracle SQL Loader from java program

Hi,
I want to insert data into oracle tables from a text files containing fixed length fields. I am using SQLLoader to achieve this. The requirement is to call the SQLLoader within the java program.
Does anyone know how to call SQL Loader from java program?
Thanks,
Varsha

Simply "exec" the sqlldr program with the parameters you need to pass to it.
Runtime.exec (........)
Try to pass all parameters needed including the username and password, and use the option "silent" to avoid output, and the option "log" to have a log file of the modifications that sqlldr has done to the database.

How to call a remote external c++ program from a local java program?

local java program pass some parameters to a remote C++ program and get the result from that C program output.

You could use a tcp/ip connection (e.g. with Sockets), and pass the parameters as Strings in the socketstream.

Start java-Program when Tomcat starts

I have a TimerTask, that should be executed every hour (war in webapp of Tomcat). If Apache Tomcat will be shut down and started again, Task won't be executed.
Can I define somewhere, that some class should be executed when Tomcat server starts and after restart the tasks will be countinued.
Can I, for example define it some where in web.xml or somewhere else?
I can't controll when tomcat was turned off and started again.
Thanks in advance.

I have a TimerTask, that should be executed every
hour (war in webapp of Tomcat). If Apache Tomcat will
be shut down and started again, Task won't be
executed.
Can I define somewhere, that some class should be
executed when Tomcat server starts and after restart
the tasks will be countinued.
Can I, for example define it some where in web.xml or
somewhere else?
I can't controll when tomcat was turned off and
started again.
Thanks in advance.My advice is to be:
Making your TimerTask to be an application which will do something every 1 hour if it has nothing to do with the Tomcat Server .And tell us what do you want your TimerTask to do ???waiting for you .

Executing a program when the server starts

I have developed a chat program and to run it I have type "java ChatManager".
Is there a way where this program can start automatically when I start the tomcat.
Regards,
Sharad

The chat application is a java file. I need to keep it running so that I can use it in my applet. The problem is after I start the tomcat, I have start the chat application and for this I open a new window and type "java ChatManager". Once this is done I can start using the chat applet. Is there a way, where the chat application starts automatically when the tomcat starts. Do I need to add something in the server.xml file for this.
Regards,
Sharad

How to load a java class when application is at first time browsed.

Hi
How can i load a simple java class on application startup.
For servlet it could be done using "load on startup" tag in web.xml
but how could the same be achieved for a simple java class.
Thanks

Hi
Code is given below....
package com;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Test {
Test()
     HttpServletRequest request=null;
     HttpServletResponse response=null;
     RequestDispatcher requestDispatcher = request.getRequestDispatcher("a.jsp");
     try {
          requestDispatcher.forward(request,response);
     } catch (ServletException e) {
          System.out.println("success");
          e.printStackTrace();
     } catch (IOException e) {
          System.out.println("success 1");
          e.printStackTrace();
     finally
          System.out.println("success 2");
     System.out.println("success 3");
}Web.xml :
<servlet>
        <servlet-name>simple</servlet-name>
        <servlet-class>com.Test</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
<servlet-mapping>
      <servlet-name>simple</servlet-name>
      <url-pattern>/init.do</url-pattern>
    </servlet-mapping>Error Trace :
org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet /DispatcherTest threw load() exception
java.lang.IllegalAccessException: Class org.apache.catalina.core.StandardWrapper can not access a member of class com.Test with modifiers ""
     at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:65)
     at java.lang.Class.newInstance0(Class.java:344)
     at java.lang.Class.newInstance(Class.java:303)
     at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1048)
     at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:925)
     at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3857)
     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4118)
     at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1069)
     at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1162)
     at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)
     at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
     at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1304)
     at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1568)
     at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1577)
     at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1557)
     at java.lang.Thread.run(Thread.java:595)

Connecting a Local Java Program with a Mysql Database Hosted on the Interne

I need help. I want to connect a java program running on local user computers to read and write to a mysql database hosted in my domain by an internet service provider.
What code do i use?
How do i connect?

http://java.sun.com/developer/onlineTraining/Database/JDBC20Intro/JDBC20.html
You'll ned to downloda the JDBC driver file from MySQL, and check their docs for the format of the connection URL.

Running Java Programs when JDBC libraries in classpath

Hi I am running NT Server 4.0 SP5 and Oracle 8i.
I have compiled several Java Programs, some of which use Oracles
JDBC drivers. When I try to run any of the programs I get the
complaint "Can't find class X", where X is the class which
contains main(..) and the name of the file. If I delete the
references to BOTH (leaving one does nothing) classes111.zip and
nlscharset11.zip in the classpath, the programs, which don't use
JDBC run fine, but the ones which do use JDBC and need those
packages complain. If I put the classes which need the Oracle
JDBC drivers in the same directory as the classes111.zip and
nlscharset11.zip (with an empty classpath) I get the first error
"Can't find class X", where X is the class which contains
main(..) and the name of the file. I have tried these
combinations with four different Java compliers and VM and always
get the same errors.
Thanks, Charlie
null

set PATH=%PATH%;C:\ORAWIN95\BIN
set
PATH=C:\WINDOWS;C:\WINDOWS\COMMAND;C:\jdk1.3\bin;C:\ORA
IN95\BIN
set
CLASSPATH=C:\jdk1.3\lib\jvm.lib;C:\jdk1.3\lib\tools.jar
set
CLASSPATH=C:\project;C:\tomcat\common\lib\servlet.jar
set CLASSPATH=C:\tomcat\bin\jasper.jar
set CLASSPATH=C:\jsdk2.1\servlet.jar
set CLASSPATH=C:\jdk1.3\bin;C:\projectBy the way, after running these commands your classpath will ONLY contain C:\jdk1.3\bin;C:\project, because that is the last thing you set it to.
To add to your classpath, you need to do something like:
set CLASSPATH=%CLASSPATH%;C:\jdk1.3\bin;C:\project
which works because %CLASSPATH% evaluates to the current value of CLASSPATH.

Load a java program core in dbx

Hi Guys,
I have a core of a Java program which is writen in a mix mode means that at higher level we have Java code then for native call we have JINI calls. So we have a core of this application and we are not able to see the code written in Java. Also do we have any other debugger which can be used to debug this core. Below is the snapshot of the stack we have
bash-3.00$ /users/SUNWspro12/bin/dbx
(dbx) source pathmaps
(dbx) debug -f java core
(dbx) where
Here JINI code is visible
[15] 0xf9c0ba3c(0xf27dd058, 0xb7, 0x0, 0xc, 0xf1a20000, 0xfc67f450), at 0xf9c0ba3c
[16] 0xf9c05c64(0xf27dd058, 0xb6, 0xfc67f5bc, 0xf9c146e0, 0xc9db8, 0xfc67f4d8), at 0xf9c05c64
[17] 0xf9c05c64(0xf27dd058, 0xb6, 0xfc67f63c, 0xf9c144d0, 0xf9c0aae0, 0xfc67f558), at 0xf9c05c64
[18] 0xf9c05c64(0xfc67f8c8, 0xfc67f77c, 0xfc67f7d4, 0xf9c144d0, 0xc9db8, 0xfc67f5e0), at 0xf9c05c64
[19] 0xf9c00118(0xfc67f6c8, 0xfc67f8d0, 0xa, 0xf5c2a110, 0xf9c0aae0, 0xfc67f7dc), at 0xf9c00118
[20] JavaCalls::call_helper(0xfc67f8c8, 0xfc67f77c, 0xfc67f7d4, 0xc9db8, 0xc9db8, 0xfc67f9c0), at 0xfecc8448
[21] jni_invoke_nonstatic(0xb24ac, 0x0, 0xca380, 0xff005eb0, 0xb24a0, 0xfc67f8ac), at 0xfecdb1f8
[22] jni_CallVoidMethod(0xc9e4c, 0xfc67fa24, 0xb24a0, 0xff0037c8, 0xcaab8, 0xfc67f9c0), at 0xfed95410
[23] Java_java_lang_ref_Finalizer_invokeFinalizeMethod(0xc9e4c, 0xfc67f9a8, 0xfc67fa24, 0xf9c147f0, 0xc9db8, 0x0), at 0xfe9de928
[24] 0xf9c0ba3c(0xf27dd058, 0xb8, 0xfc67fa28, 0x4, 0xf27dc3b0, 0xfc67f9c0), at 0xf9c0ba3c
[25] 0xf9c05c64(0xf27dc3b0, 0xb7, 0xfc67fb24, 0xf9c147f0, 0xc9db8, 0xfc67fa50), at 0xf9c05c64
[26] 0xf9c05c64(0xf27dc3b0, 0xb8, 0xfc67fba4, 0xf9c14690, 0xf581ea70, 0xfc67fac8), at 0xf9c05c64
[27] 0xf9c05c64(0xfc67fe90, 0xfc67fcf8, 0xfc67fdb0, 0xf9c147f0, 0xc9db8, 0xfc67fb48), at 0xf9c05c64
[28] 0xf9c00118(0xfc67fc30, 0xfc67fe98, 0xa, 0xf5850078, 0xf9c0aae0, 0xfc67fdb8), at 0xf9c00118
[29] JavaCalls::call_helper(0xfc67fe90, 0xfc67fcf8, 0xfc67fdb0, 0xc9db8, 0xc9db8, 0xfc67fd08), at 0xfecc8448
[30] JavaCalls::call_virtual(0xfeff0000, 0xca360, 0xfc67fda4, 0xfc67fda0, 0xfc67fdb0, 0xc9db8), at 0xfecd6de4
[31] JavaCalls::call_virtual(0xfc67fe90, 0xfc67fe8c, 0xfc67fe84, 0xfc67fe7c, 0xfc67fe74, 0xc9db8), at 0xfecd6c70
[32] thread_entry(0xc9db8, 0xc9db8, 0x8cb70, 0xca360, 0x319568, 0xfecd69fc), at 0xfecd6bf8
[33] JavaThread::run(0xc9db8, 0xffffffe2, 0xff00f7d8, 0xffff8000, 0x0, 0x0), at 0xfecd6a24
[34] _start(0xc9db8, 0xfc680000, 0x0, 0x0, 0xfecc6ba8, 0x1), at 0xfecc6cdc
How to check the varible in this code frame as I am getting this error when I try to check state of some variable
(dbx) frame 15
0xf9c0ba3c: call %o0
(dbx) print _rep
dbx: warning: unknown language, 'c' assumed
dbx: "_rep" is not defined in the scope `java`(unknown)`
dbx: see `help scope' for details
Any pointer in this regard will be a great help.

Java debugging requires an active agent to interface with the debugger.
Since a corefile is not active it cannot run an agent, so no Java corefile
debugging with dbx.
There exist lighter weight "agents" that 'pstack' on Solaris for example uses
but we haven't looked into using it. I recall from early experimentation
that it was supposed to help with corefiles too but while pstack
on newer Solarises can detect Java frames in a live process it still
misses them with VM coredumps.

Mbp has horrible load times on programs when starting up

Hey guys, I'd appreciate if anyone could answer this for me, or perhaps experiences the same thing. Whenever I boot up my laptop, I give it a few moments to load. But when I launch my first app, usually firefox or mail, it freezes for what feels like ages until it finally loads. During this time I can use my mouse, but nothing will respond. I've checked my ram and everything with the hardware test, and once that first app is loaded things generally speed up, but it drives me nuts, and I see no reason for it to happen.
Thanks in advance,
Seth

OK I take that back...sorry...it now takes close to 5 minutes to load once I launch an app for the first time...i tried stickies and that freaked out. I'm going to post the log from the console...maybe someone can help?
Mac OS X Version 10.4.8 (Build 8L2127)
2007-02-19 16:15:01 -0800
2007-02-19 16:15:52.969 Mail[353] * -[NSBundle load]: Error loading code /Users/Seth/Library/Mail/Bundles/JunkMatcher.mailbundle/Contents/MacOS/JunkMatc her for bundle /Users/Seth/Library/Mail/Bundles/JunkMatcher.mailbundle, error code 2 (link edit error code 0, error number 0 ())
2007-02-19 16:19:35.199 DashboardClient[368] com.interdimensionmedia.widget.abracadabra:
2007-02-19 16:19:37.059 DashboardClient[373] setSearchComboBox...
2007-02-19 16:20:54.791 loginwindow[109] * Assertion failure in -[NSButton lockFocus], AppKit.subproj/NSView.m:3248
2007-02-19 16:20:54.998 loginwindow[109] lockFocus sent to a view whose window is deferred and does not yet have a corresponding platform window

Calling SQL LOADER From Java Program

Hi
I need to invoke sql loader from inside a Java Class.
Any Pointers in this regards will be really appreciated.
Thanks
Vishal

You can create two different files which has sqlldr command defined....
1. loader.sh
2. loader.bat
and in the depending on the OS execute one...
         String command = "";
         if(System.getProperty("os.name").equals("Windows 2000")){
                //if os is windows 2000 then execute bat file
                 command = <<bat file path>>
          }else{
                  command = <<shell path>>
          Runtime rt = Runtime.getRuntime();
          Process p = rt.exec(command);
          int i = p.exitValue();

Error in Java Program when passing table to RFC function . JCO is used

Hai All,
I developed a JAVA application to update data into SAP using JCO via RFC. When i pass table to the function module i am getting the below error
com.sap.mw.jco.JCO$Exception: (104) RFC_ERROR_SYSTEM_FAILURE: Conversion from type T to D not supported.
Please let me know how to solve this.
Below is my code
IRepository m_Repository;
IFunctionTemplate ftemplate;
JCO.Table PwdReq;
JCO.Function function;
m_Repository = JCO.createRepository("MYRepository", client);
            ftemplate = m_Repository.getFunctionTemplate("Z_GESEFM_UPD_PWD_RESET_REQUEST");
// Create a function from the template
function = new JCO.Function(ftemplate);
// Feeding in input parameters
PwdReq = function.getTableParameterList().getTable("RESULT2");
String userid = "PATCHTEST14 ", reqDate = "",reqNo = "01",reqStatus = "03", boxID = "09",ind2 = "X",
                    lcode = "abcd",rem = "One record testing";
PwdReq.appendRow();
                PwdReq.setValue(userid, "USERID");
                PwdReq.setValue(reqNo,"REQ_NO");
                PwdReq.setValue(reqStatus,"REQ_STATUS");
                PwdReq.setValue(boxID,"BOX_ID");
                PwdReq.setValue(ind2,"IND2");
                PwdReq.setValue(lcode,"LCODE");
                PwdReq.setValue(rem,"OTHER_REMARKS");
            // execute the function with the input parameters
            client.execute(function);
Thanks & Regards,
H.K.Hayath Basha.

hi,
I am not very good in Java.
but try this code to giving input parameter.
function.getImportParameterList().setValue(userid, "USERID");
if you are not using Try and Catch blok then use Try and Catch blok,
Regards
Manoj

Java Program and Applet

I am writing a program in which i need to take a string a user and count the number of words, Characters, and
a particular sub-string. i need to Present back this info. I am a virtual beginner and i did not get any way of doing this. Please somebody help me

geez man, you make it sound like your dying and need someone to save you. Since I am too lazy to write the whole program for you (and why should I?). You could use something like this to count the characters
numOfChars = sentence.length()-1;that will give you the number of characters in the string including spaces.
hmm thats enough to get you started :-p. Be sure to seach the forum to. You should be able to find the solution to your problem reletively easily.

Java Exception when attempt to start the SNMP agent

Hi,
I require to start the SNMP agent in Solaris 2.6 running Web Logic 5.1. Upon entering
the command :
$ java weblogic.SNMPAgent, it is asking me for the password , and I gave the same.
The system is
generating a Java Exception given below:
Exception in thread "main" com.adventnet.snmp.snmp2.agent.AgentRuntimeException:
Failure in opening SnmpSession, errstat: 0, errvalue: 0
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.lang.RuntimeException.<init>(RuntimeException.java:47)
at com.adventnet.snmp.snmp2.agent.AgentRuntimeException.<init>(AgentRuntimeException.java:63)
at com.adventnet.snmp.snmp2.agent.SnmpAgent.addClientAndOpenSession(SnmpAgent.java:801)
at com.adventnet.snmp.snmp2.agent.SnmpAgent.restartSnmpAgent(SnmpAgent.java:939)
at com.adventnet.snmp.snmp2.agent.SnmpAgent.restartSnmpAgent(CompiledCode)
at com.adventnet.snmp.snmp2.agent.SnmpAgent.setPort(Compiled Code)
at weblogic.management.snmp.agent.WebLogicAgent.init(Compiled Code)
at weblogic.management.snmp.agent.WebLogicAgent.startup(WebLogicAgent.java:377)
at weblogic.SNMPAgent.main(SNMPAgent.java:25)
Given below is the file <startSNMPAgent.sh> and it's central contents:
$JAVA weblogic.SNMPAgent -password pbgst -serverURLs t3://localhost:7001 -trap
Destinations localhost:162
The classpath settings are correct and as per documentation.
There are SNMP agents also running in the machine which have been started by default
by Solaris,
doing a ps -ef | grep snmp shows:
root 556 1 0 Jun 23 ? 0:00 /usr/lib/dmi/snmpXdmid -s sunhyd01
root 516 1 0 Jun 23 ? 0:00 /usr/lib/snmp/snmpdx -y -c /etc/snmp/conf
pbgst 28090 25879 0 17:01:37 pts/32 0:00 grep snmp
I tried to start the SNMP agent on a diff. port and specified the same in the
.sh file and also changed the
trap Destinations port ---- it still generates the same exception.
Please do try to resolve this problem for me, as the project is in production
phase.
Thanks for all help beforehand.
Baivab
P.S. How can I obtain the id for WebSupport center, as we have using WL licensed
product
recently purchased in 3 nos.

Hello,
way back we had the same problem and the reason was, that the path
names with the server instances were to long
(/opt/wlsroot/wlsInstances/axsExpert.SwissAir/S_243_7001 ->
/opt/wlsroot/wlsInstances/axsExpert.SAir/S_243_7001). But this was
with WLS 5.1 SP8.
Regards
Wolfgang Becker
Atraxis
On 9 Jul 2001 23:02:29 -0800, "Baivab Mitra"
<[email protected]> wrote:
>
Hello Michel,
Thanks for the reply. As you may have noticed, that the SNMP agents which are
already running, the owner is <root>. These services are required and I do not
have or I can not obtain the password to start/stop the same. As such, the only
option which I have is to start the weblogic-specific SNMP service in a different
port. Question: In the parameters, I specified : <snmpPort 1600 trace Destinations
1601> I am still getting the same error. What else is required and/or how do I
proceed to start the same service?
Thanks for your help beforehand,
Baivab
"Michael Girdley" <----> wrote:
It looks like another SNMP agent has already bound to the port.
Michael Girdley
BEA Systems
Learning WebLogic? http://learnweblogic.com
"Baivab Mitra" <[email protected]> wrote in message
news:[email protected]...
Hi,
I require to start the SNMP agent in Solaris 2.6 running Web Logic5.1.
Upon entering
the command :
$ java weblogic.SNMPAgent, it is asking me for the password , and Igave
the same.
The system is
generating a Java Exception given below:
Exception in thread "main"com.adventnet.snmp.snmp2.agent.AgentRuntimeException:
Failure in opening SnmpSession, errstat: 0, errvalue: 0
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Compiled Code)
at java.lang.Throwable.<init>(Compiled Code)
at java.lang.Exception.<init>(Compiled Code)
at java.lang.RuntimeException.<init>(RuntimeException.java:47)
atcom.adventnet.snmp.snmp2.agent.AgentRuntimeException.<init>(AgentRuntimeExce
ption.java:63)
atcom.adventnet.snmp.snmp2.agent.SnmpAgent.addClientAndOpenSession(SnmpAgent.j
ava:801)
atcom.adventnet.snmp.snmp2.agent.SnmpAgent.restartSnmpAgent(SnmpAgent.java:939
atcom.adventnet.snmp.snmp2.agent.SnmpAgent.restartSnmpAgent(CompiledCode)
at com.adventnet.snmp.snmp2.agent.SnmpAgent.setPort(CompiledCode)
at weblogic.management.snmp.agent.WebLogicAgent.init(CompiledCode)
atweblogic.management.snmp.agent.WebLogicAgent.startup(WebLogicAgent.java:377)
at weblogic.SNMPAgent.main(SNMPAgent.java:25)
Given below is the file <startSNMPAgent.sh> and it's central contents:
$JAVA weblogic.SNMPAgent -password pbgst -serverURLst3://localhost:7001 -trap
Destinations localhost:162
The classpath settings are correct and as per documentation.
There are SNMP agents also running in the machine which have been startedby default
by Solaris,
doing a ps -ef | grep snmp shows:
root 556 1 0 Jun 23 ? 0:00 /usr/lib/dmi/snmpXdmid-s
sunhyd01
root 516 1 0 Jun 23 ? 0:00 /usr/lib/snmp/snmpdx -y-c
/etc/snmp/conf
pbgst 28090 25879 0 17:01:37 pts/32 0:00 grep snmp
I tried to start the SNMP agent on a diff. port and specified the samein
the
sh file and also changed the
trap Destinations port ---- it still generates the same exception.
Please do try to resolve this problem for me, as the project is inproduction
phase.
Thanks for all help beforehand.
Baivab
P.S. How can I obtain the id for WebSupport center, as we have usingWL
licensed
product
recently purchased in 3 nos.

Error while loading java program using loadjava

Hi
I have oracle 8.1.7 in NT server. When I try to load a java program with load java it gives me the error like this
Error while resolving class EchoInput
ORA-00904: invalid column name
loadjava: 1 errors
Why this is happening. How can I resolve this. Any help is appreciated
Thanks
Santhosh

You need to install teh jserver component.
have your dba review this and run all java enabling scripts.
look for it in the doc as initjvm.sql.

Loading local Java program when Applet is started

Similar Messages

Maybe you are looking for