Java class how to load a JavaFX class?

I want to start a JavaFX application from a Java class,how can implement it?
Thank you so much!

Similar Messages

How to load a java class at server start-up

Hi,
I have one custome java class that is being referenced by all the applications deployed in OC4J container. How can I load that class automatically and be evailable in the path at server start-up time. Is there an option available to give the class name that also gets loaded automatically.
Thanks

To me, you have two mixed issues.
1. OC4J supports a startup/shutdown model where a named class will be invoked when the container is started (or stopped).
This is described in the doc here:
http://download-west.oracle.com/docs/cd/B32110_01/web.1013/b28952/startclas.htm#CIHECEIB
Note that this specifically calls the methods that are implemented from the respective OC4JShutdown and OC4JStartup interfaces -- the class that is instantiated and called here is not available to all other applications by default. This is more to suit the need where something needs to be done when the container is started/stopped.
2 The next option is where you just want to make a class available to all applications deployed to the container. For this we provide the shared-library mechanism. Using this you can either make use of the implicit global.libraries shared-lib in which you simply drop JAR files into the j2ee/home/applib directory whereupon the classes will become available by default to all applications. Or you can choose to install a shared-library that contains your specific classes (in a JAR file) and then import that into the default application whereupon the configuration will be inherited by all deployed applications.
cheers
-steve-

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)

How to load java class from jsp page?

hi all!
Does anyone know how to load java class from jsp page?
I try to load java class from jsp page.
Is it possible to load java class fom jsp page?
thanks and have a good day!

What I mean is How to load/open java class file from jsp page?
I think we can open Applet from jsp page by using
<applet code=helloApplet.class width=100 height=100>
</applet>
but, how to open java class which is an application made by Frame?
thanks and have a good day

How do I write a Java Class that Loads a RPT and exports to PDF All Automatically?

I am using Crystal Reports for Eclipse and I am trying to create a java class that will do everything independently. It will take a .rpt file, load it with data from the database and then export that to a pdf file and put that pdf in a specific location with a specific name. I am using the Crystal Reports for Eclipse and the sample jsp project does that but I am looking for a java class example that doesn't require human interaction through the website. I have read the help file and seen snippet examples but I am not seeing a complete example. Could someone point me in the proper direction of a good example either in the forum or the help file for eclipse?

Hi, If you wanted to achieve this in a JSP page then I would suggest using the JSP Page Wizard as it allows you to select PDF as an output type. You can run the wizard and choose the PDF output and it will automatically generate the required code for you. However, as you want to use a Java class then I would suggest downloading the following package of sample code:<a href="http://support.businessobjects.com/communityCS/FilesAndUpdates/crxi_r2_jrc_desktop_samples.zip">http://support.businessobjects.com/communityCS/FilesAndUpdates/crxi_r2_jrc_desktop_samples.zip</a> This package includes a number of sample Java classes that demonstrate how to use the engine. The one that you will be interested in is titled "JRCExportReport" To make life easier I would suggest trying the class in a Crystal Reports Web Project as the runtime libraries will automatically be in the classpath. Anyway, give this a shot and let me know how you make out. Regards, Sean Johnson (CR4E Product Manager) <a href="http://www.eclipseplugincentral.com/Web_Links-index-req-ratelink-lid-639.html">Rate this plugin @ Eclipse Plugin Central</a>

SQLPLUS: How to verify that java class file have been loaded

Hi All,
I just loaded my Java class file using CREATE OR REPLACE JAVA.
Java was created sucessfuly, but how can I check or find out if my file have been loaded correctly.
I also found a command :
SQL>exec myjava.showobjects
but i don't have the loadjava utility install....is there any command from SQL PLUS?
thanks

Thanks for the sql command....after that query what do I do next to see if for example tree.class is in the dba_object.
Sorry, I am a newbie and the question may be a bit generic .....

How i load java class through javascript

Hi,
i want to load java class file at client side through the java script. Class file wich already at client side(client machine)
tell me is it possible....
thanks
plzz mail
[email protected]

From your post it is not very clear what you want to do.
1. Even if it was possible to load client classes using javascript, how on earth are you going to execute them ??? JavaScript and java are entirely different cups of tea.
2. If it was an applet, then probably you can access some classes from the client machine. Definely the default packages. However, I don't know whether you can access other classes. That might lead to a security issue. Please check with a java securities expart.
3. Loading a class from the client machine is DEFINITELY A BAD PROGRAMMING PRACTICE Use the codebase property on your applet tag to load the classes from the server.

How do you invoke custom java classes???

Could someone post a detailed method of invoking custom java classes that works including what files go where, settings and the way it is invoked etc.
I have tried various ways from this forum and in the documentation without success. I am using IDM 8. I found these instructions regarding how you would do it if you were writing custom resource adaptors in the deployment tools guide:
To install a resource adapter youve customized:
1. Load the NewResourceAdapter.class file in the Identity Manager installation
directory under
idm/WEB-INF/classes/com/waveset/adapter/sample
(You might have to create this directory.)
2. Copy the .gif file to idm/applet/images.
This .gif file is the image that displays next to the resource name on the List
Resources page, and it should contain an image for your resource that is
18x18 pixels and 72 DPI in size.
3. Add the class to the resource.adapter property in
config/waveset.properties.
4. Stop and restart the application server. (For information about working with
application servers, see Identity Manager Installation.)
I tried the instructions here but placed my custom class in a folder entitled custom instead of /adapter/sample. Not sure about instruction 3 or whether it is relevent. Anyway nothings working.
Edited by: masj78 on Nov 25, 2008 3:50 AM
Edited by: masj78 on Nov 25, 2008 4:03 AM

Hi,
The way to add custom class is the same as you followed , put them in the WEB-INF/classes.
To use the custom adapter ,
Go To Resources - > Configure Types -> Add Custom Resource .
Type in the fully qualified class name of the custom adapter you added.and Save.
Now the new adapter you added should showup in the list of available adapters when you try to
configure a new adapter.
(Make sure that the prototype XML of your custom adapter is correct so that it displays the correct name / type for the adapter in the adapter list.
Thanks,
Balu

How can I either move or view the source of a JAVA CLASS user object?

I am using Oracle 8i and I have the following JAVA CLASS objects in my database. I need to move some of these objects to a different database.
1) How can I do this?
2) How can I view the JAVA source code since these are classes?
My knowledge of Oracle is limited. I have searched and searched and I can't find the answer. Any help would be greatly appreciated
SELECT object_name, object_type
FROM user_objects
WHERE object_type IN ('JAVA SOURCE', 'JAVA CLASS', 'JAVA RESOURCE')
ORDER BY object_type, object_name;
OBJECT_NAME OBJECT_TYPE
/d082321a_DpsJarStaticFilename JAVA CLASS
DirHelperStatic JAVA CLASS
DirHelperStatic$1 JAVA CLASS
DpsJar JAVA CLASS
DpsJarException JAVA CLASS
DpsJarStatic JAVA CLASS
FilenameFilterImpl JAVA CLASS
FtpClient JAVA CLASS
FtpClient$InputStreamProxy JAVA CLASS
FtpClient$OutputStreamProxy JAVA CLASS
FtpClientStatic JAVA CLASS
FtpException JAVA CLASS
FtpReply JAVA CLASS
FtpTest JAVA CLASS
LoadXml JAVA CLASS
LoadXmlStatic JAVA CLASS
UrlFileUtils JAVA CLASS
Utils JAVA CLASS
dir JAVA CLASS
Thanks,
Brian

The source far java class objects that are not derived from java source objects
(which is the case here, and is typically the case, such as when one loads
classes into the database using loadjava on a jar that contains only .class
files) does not exist in the database (just as it does not exist in a jar which
contains only .class files). So there is essentially no way to view the source, short of extracting the bytecodes and using some decompiling tool. I don't recall what methodologies exist for extracting bytecodes in 8i. As for transferring
the classes to another database, the standard Oracle import/export tool can do this.

How to use java class in pl/sql

Hai Guys,
here is my java class:
import java.io.*;
public class ListFiles
public static void main (String[] args)
File file=new File("C:\\");
File[] files=file.listFiles();
for(int fileInList=0; fileInList<files.length; fileInList++ )
System.out.println(files[fileInList].toString() );
i want to use this class in pl/sql, i am new about this topic my concern are following
how to load java class
how to use in pl/sql
Guys i'll be great-full to you if you could help me out or share link or document .

First Read https://forums.oracle.com/forums/ann.jspa?annID=432
Check this link...
1. http://www.devshed.com/c/a/Oracle/Extending-PLSQL-with-Java-Libraries-concluded/
2. calling java from pl/sql in oracle 10g?its very urgent.
3. http://qamarsyed.blogspot.com/2010/07/calling-java-from-plsql-inside-oracle.html
4. http://home.c2i.net/toreingolf/oracle/java_and_plsql.htm
Hope this helps...
If someone response is helpful or correct, please mark it accordingly.

How to get database connection in common java class

hi friendz,
plz help me...
I am using JDEV 11.1.2.2.0 version.
my problem is I'm writing common java class which can reuse any application.
in this case when im create database connection like this,
String username = "a";
String password = "b";
String thinConn = "jdbc:oracle:thin:@IP:1521:database";
DriverManager.registerDriver(new OracleDriver());
Connection conn =
DriverManager.getConnection(thinConn, username, password);
conn.setAutoCommit(false);
return conn;
but this statement not working in java class.its working only backing bean.
import oracle.jdbc.OracleDriver;
DriverManager.registerDriver(new OracleDriver());
how can i do that??
hope your help
-Harsh-

What is the error message in Java class?
With JDBC 4.0 driver the DriverManager class has added support for the Java SE Service Provider mechanism to the getConnection() and getDrivers() methods using which JDBC drivers may be loaded automatically. The following Class.forName() method is not required to be invoked.
Class.forName(“oracle.jdbc.OracleDriver”);
Only the following is required to obtain a connection.
String url="jdbc:oracle:thin:@localhost:1521:ORCL";
Connection connection = DriverManager.getConnection(url,"oe", "pw");

How to set classpath from java class ??

I have tried to use System.setProperty("java.class.path", "my class path string ") to set classpath dynamically. But it is not working. How to set it dynamically from java class ?? Thanks , gary

Look into the java.net.URLClassLoader. You can't set the classpath after the fact but you can specify URL's that will checked when you try to load a class with that loader.

How to load class from jar file dynamically?

After I run my Java applicatoin, I need configuring the classpath of jvm to load some classess inside a jar file into the same jvm.How can I achive that?
I mean, when I run my Java application, I don't know where the jar file is, what the jar file name is. All depends on the user to tell the jvm the details through some UI. I've tried to write: System.setProperty("java.class.path", "c:\myClass.jar");Class.forName("MyClass"); but failed.
Can you tell my why and how?
Thx

After I run my Java applicatoin, I need configuring
the classpath of jvm to load some classess inside a
jar file into the same jvm.How can I achive that?
I mean, when I run my Java application, I don't know
where the jar file is, what the jar file name is. All
depends on the user to tell the jvm the details
through some UI. I've tried to write:
System.setProperty("java.class.path",
"c:\myClass.jar");Class.forName("MyClass"); but
failed.That won't work. By the time it gets to your code it already has a copy of the original. You can't change it (short of modifying the JVM.)
Can you tell my why and how?The usual way is to use a custom classloader.
You can start by looking at java.net.URLClassLoader.

Binding a JavaFX variable to a Java class instance variable

Hi,
I am pretty new to JavaFX but have been developing in Java for many years. I am trying to develop a JavaFX webservice client. What I am doing is creating a basic scene that displays the data values that I am polling with a Java class that extends Thread. The Java class is reading temperature and voltage from a remote server and storing the response in an instance variable. I would like to bind a JavaFx variable to the Java class instance variable so that I can display the values whenever they change.
var conn: WebserviceConnection; // Java class that extends Thread
var response: WebserviceResponse;
try {
conn = new WebserviceConnection("some_url");
conn.start();
Thread.sleep(10000);
} catch (e:Exception) {
e.printStackTrace();
def bindTemp = bind conn.getResponse().getTemperature();
def bindVolt = bind conn.getResponse().getVoltage();
The WebserviceConnection class is opening a socket connection and reading some data in a separate thread. A regular socket connection is used because the server is not using HTTP.
When I run the application, the bindTemp and bindVolt are not updated whenever new data values are received.
Am I missing something with how bind works? Can I do what I want to do with 'bind'. I basically want to run a separate thread to retrieve data and want my UI to be updated when the data changes.
Is there a better way to do this than the way I am trying to do it?
Thanks for any help in advance.
-Richard

Hi,
If you don't want to constantly poll for value change, you can use the observer design pattern, but you need to modify the classes that serve the values to javafx.
Heres a simple example:
The Thread which updates a value in every second:
// TimeServer.java
public class TimeServer extends Thread {
    private boolean interrupted = false;
    public ValueObject valueObject = new ValueObject();
    @Override
    public void run() {
        while (!interrupted) {
            try {
                valueObject.setValue(Long.toString(System.currentTimeMillis()));
                sleep(1000);
            } catch (InterruptedException ex) {
                interrupted = true;
}The ValueObject class which contains the values we want to bind in javafx:
// ValueObject.java
import java.util.Observable;
public class ValueObject extends Observable {
    private String value;
    public String getValue() {
        return this.value;
    public void setValue(String value) {
        this.value = value;
        fireNotify();
    private void fireNotify() {
        setChanged();
        notifyObservers();
}We also need an adapter class in JFX so we can use bind:
// ValueObjectAdapter.fx
import java.util.Observer;
import java.util.Observable;
public class ValueObjectAdapter extends Observer {
    public-read var value : String;
    public var valueObject : ValueObject
        on replace { valueObject.addObserver(this)}
    override function update(observable: Observable, arg: Object) {
         // We need to run every code in the JFX EDT
         // do not change if the update method can be called outside the Event Dispatch Thread!
         FX.deferAction(
             function(): Void {
                value = valueObject.getValue();
}And finally the main JFX code which displays the canging value:
// Main.fx
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.text.Text;
import javafx.scene.text.Font;
import threadbindfx.TimeServer;
var timeServer : TimeServer;
var valueObjectAdapter : ValueObjectAdapter = new ValueObjectAdapter();
timeServer = new TimeServer();
valueObjectAdapter.valueObject = timeServer.valueObject;
timeServer.start();
Stage {
    title: "Time Application"
    width: 250
    height: 80
    scene: Scene {
        content: Text {
            font : Font {
                size : 24
            x : 10, y : 30
            content: bind valueObjectAdapter.value;
}This approach uses less cpu time than constant polling, and changes aren't dependent on the polling interval.
However this cannot be applied to code which you cannot change obviously.
I hope this helps.

How to load class ???

please note the below code :
String systemPath = System.getProperty("java.class.path");
String classpath = "E:\\Test.jar;" + systemPath;
System.setProperty("java.class.path",classpath);
System.out.println("class-path: " + getCompilerClassPath());
Class.forName("Test");
Why I can't load the Test class ?? please help me !
thanks!

After I run my Java applicatoin, I need configuring
the classpath of jvm to load some classess inside a
jar file into the same jvm.How can I achive that?
I mean, when I run my Java application, I don't know
where the jar file is, what the jar file name is. All
depends on the user to tell the jvm the details
through some UI. I've tried to write:
System.setProperty("java.class.path",
"c:\myClass.jar");Class.forName("MyClass"); but
failed.That won't work. By the time it gets to your code it already has a copy of the original. You can't change it (short of modifying the JVM.)
Can you tell my why and how?The usual way is to use a custom classloader.
You can start by looking at java.net.URLClassLoader.

Java class how to load a JavaFX class?

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