Trying to run java class files from my jsp

I am having difficulty running java files from my jsp. I have compiled my two java classes and inserted them onto my server in the webapps/WEB-INF/classes/scripting directory and have imported scripting.* into my jsp page. The files both compiled ok before the class files were loaded onto the server but when I rty to run the jsp from the server, I keep getting a compiler error. Thanks in advance
Iob

Here are the few question
1) Does your java classes which u created is declared under package scripting. *.class files are to be places under the WEB-INF/classes directory only. Not under scripting. But if you java classes say are under a package called a.b. Then you need to put under classes\a\b\.

Similar Messages

Running the .class file from java code

I'm doing a kind of providing service like compiling and running Java code on server side and giving output to the end user.
Please suggest me an approach with code to run .class file from the Java code.
import java.io.*;
public class demo {
public static void main(String args[]) throws IOException, InterruptedException {
int result;
try {
System.out.println("command output:");
Process proc = Runtime.getRuntime().exec("java -cp . demoh");
InputStream in = proc.getInputStream();
result = proc.waitFor();
BufferedInputStream buffer = new BufferedInputStream(proc.getInputStream());
BufferedReader commandOutput = new BufferedReader(new InputStreamReader(buffer));
String line = null;
System.out.print(commandOutput);
try {
while ((line = commandOutput.readLine()) != null) {
System.out.print(line);
System.out.println("command output: " + line);
}//end while
commandOutput.close();
} catch (IOException e) {
//log and/or handle it
}//end catc
} catch (IOException e) {
System.err.println("IOException raised: " + e.getMessage());
}

What happened when you tried what you have there?

How to run java .class file?

How can i run/view .class file in java?. is there tool/utilities in java that can do that.?. Thanks

Ednut wrote:
I'm sure you must have been taught using the command: java yourClassName after navigating to the location of your compiled class in the command prompt.I'm sure the OP does not need condescending remarks from someone who knows almost as little Java as s/he does.

How to access variables declared in java class file from jsp

i have a java package which reads values from property file. i have imported the package.classname in jsp file and also i have created an object for the class file like
classname object=new classname();
now iam able to access only the methods defined in the class but not the variables. i have defined connection properties in class file.
in jsp i need to use
statement=con.createstatement(); but it shows variable not declared.
con is declared in java class file.
how to access the variables?
thanks

here is the code
* testbean.java
* Created on October 31, 2006, 12:14 PM
package property;
import java.beans.*;
import java.io.Serializable;
public class testbean extends Object implements Serializable {
public String sampleProperty="test2";
public String getSampleProperty() {
return sampleProperty;
}jsp file
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ page import="java.sql.*,java.util.*"%>
<html>
<head>
<title>Schedule Details</title>
</head>
<jsp:useBean id="ConProp" class="property.testbean"/>
<body>
Messge is : <jsp:getProperty name="msg" property="sampleProperty"/>
<%
out.println(ConProp.sampleProperty);
%>
</body>
</html>out.println(ConProp.sampleProperty) prints null value.
is this the right procedure to access bean variables
thanks

Can It Be Done? - Using Java Class Files from a DB

Hello,
I am interested in storing a binary java class file in my oracle DB. Then I want to get it out at runtime and execute methods on it. I am planning on casting the object to an interface and executing the methods within. Please let me know if this is possible and where to look for more info, and a code example would be awesome.
Joe
[email protected]

I think you are going to need to serialize the objects and the classes. (Don't get stuck on semantics here, I don't mean use Java Serialization to write the Class instance, I am referring to writing the .class file to a field in the database.) Obviously the instances are what you are interested in (since you mentioned casting them to interfaces and invoking methods on them), but the class definitions will need to either be available already, or stored elsewhere in the database.

Accessing a java class method from the jsp page.

Hi im a beginner with jsp and im trying to find a way to access a method of my java class file in jsp page. After searching through the forums i tried to use the usebean tag. Im using apache to host the jsp file.Below is an excerpt of my code and the error message i got. What am i doing wrong? anyone know?
<%@ page language="java" %>
<jsp:useBean id="movies" class="movie.Movie" />
<jsp:setProperty name="movies" property="*"/>
<%
movies.getStart("file:///C:/Video/Applications2/sun.mpg");
response.setContentType("text/xml");
%>
exception
org.apache.jasper.JasperException: Exception in JSP: /View.jsp:7
4: <jsp:setProperty name="movies" property="*"/>
5: <%
6:
7: movies.getStart("file:///C:/Video/Applications2/sun.mpg");
8: response.setContentType("text/xml");
9: %>
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:375)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
javax.servlet.ServletException: javax/media/ControllerListener

Hi thanks for responding. Ok i did look through and it was opening some gui. I still need the program to do server side processes so cant use an applet.but i dont need the gui so i revised it and removed the gui. also im using a servlet to call the class now yet i still have the same error. Any ideas?
Below is the vid2jpg code minus the gui.
import java.io.*;
import java.awt.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.protocol.*;
import java.awt.image.*;
import javax.imageio.*;
public class vid2jpg implements ControllerListener
     Processor p;
     Object waitObj = new Object();
     boolean stateOK = true;
     DataSourceHandler handler;
int imgWidth;int imgHeight;
     Image outputImage;
     String sep = System.getProperty("file.separator");
     int[] outvid;
     int startFr = 1;int endFr = 1000;int countFr = 0;
     boolean sunjava=true;
     * Static main method
     public static void main(String[] args)
          if(args.length == 0)
               System.out.println("No media address.");
               new vid2jpg("file:///C:/Video/applications2/sun.mpg");     // or alternative "vfw://0" if webcam
          else
               String path = args[0].trim();
               System.out.println(path);
               new vid2jpg(path);
     * Constructor
     public vid2jpg(String path)
          MediaLocator ml;String args = path;
          if((ml = new MediaLocator(args)) == null)
               System.out.println("Cannot build media locator from: " + args);
          if(!open(ml))
               System.out.println("Failed to open media source");
     * Given a MediaLocator, create a processor and start
     private boolean open(MediaLocator ml)
          System.out.println("Create processor for: " + ml);
          try
               p = Manager.createProcessor(ml);
          catch (Exception e)
               System.out.println("Failed to create a processor from the given media source: " + e);
               return false;
          p.addControllerListener(this);
          // Put the Processor into configured state.
          p.configure();
          if(!waitForState(p.Configured))
               System.out.println("Failed to configure the processor.");
               return false;
          // Get the raw output from the Processor.
          p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW));
          TrackControl tc[] = p.getTrackControls();
          if(tc == null)
               System.out.println("Failed to obtain track controls from the processor.");
               return false;
          TrackControl videoTrack = null;
          for(int i = 0; i < tc.length; i++)
               if(tc.getFormat() instanceof VideoFormat)
                    tc[i].setFormat(new RGBFormat(null, -1, Format.byteArray, -1.0F, 24, 3, 2, 1));
                    videoTrack = tc[i];
               else
               tc[i].setEnabled(false);
          if(videoTrack == null)
               System.out.println("The input media does not contain a video track.");
               return false;
          System.out.println("Video format: " + videoTrack.getFormat());
          p.realize();
          if(!waitForState(p.Realized))
               System.out.println("Failed to realize the processor.");
               return false;
          // Get the output DataSource from the processor and set it to the DataSourceHandler.
          DataSource ods = p.getDataOutput();
          handler = new DataSourceHandler();
          try
               handler.setSource(ods);     // also determines image size
          catch(IncompatibleSourceException e)
               System.out.println("Cannot handle the output DataSource from the processor: " + ods);
               return false;
     //     setLayout(new FlowLayout(FlowLayout.LEFT));
//          currPanel = new imgPanel(new Dimension(imgWidth,imgHeight));
     //     add(currPanel);
     //     pack();
          //setLocation(100,100);
     //     setVisible(true);
          handler.start();
          // Prefetch the processor.
          p.prefetch();
          if(!waitForState(p.Prefetched))
               System.out.println("Failed to prefetch the processor.");
               return false;
          // Start the processor
          //p.setStopTime(new Time(20.00));
          p.start();
          return true;
     * Sets image size
     private void imageProfile(VideoFormat vidFormat)
          System.out.println("Push Format "+vidFormat);
          Dimension d = (vidFormat).getSize();
          System.out.println("Video frame size: "+ d.width+"x"+d.height);
          imgWidth=d.width;
          imgHeight=d.height;
     * Called on each new frame buffer
     int nextframetime = 0;
private void useFrameData(Buffer inBuffer)
try
if(inBuffer.getData()!=null) // vfw://0 can deliver nulls
if(sunjava) // and with import javax.imageio.*;
int frametimesecs = (int)(inBuffer.getTimeStamp()/1000000000);
if(frametimesecs%10 == 0 && frametimesecs==nextframetime)
nextframetime+=10;
BufferedImage bi = new BufferedImage(outputImage.getWidth(null), outputImage.getHeight(null), BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
ImageIO.write(bi, "png", new File("images"+sep+"image_"+(inBuffer.getTimeStamp()/1000000000)+".png"));
catch(Exception e){}
     * Tidy on finish
     public void tidyClose()
          handler.close();
          p.close();
     * Block until the processor has transitioned to the given state
     private boolean waitForState(int state)
          synchronized(waitObj)
               try
                    while(p.getState() < state && stateOK)
                    waitObj.wait();
               catch (Exception e)
          return stateOK;
     * Controller Listener.
     public void controllerUpdate(ControllerEvent evt)
          if(evt instanceof ConfigureCompleteEvent ||     evt instanceof RealizeCompleteEvent || evt instanceof PrefetchCompleteEvent)
               synchronized(waitObj)
                    stateOK = true;
                    waitObj.notifyAll();
          else
          if(evt instanceof ResourceUnavailableEvent)
               synchronized(waitObj)
                    stateOK = false;
                    waitObj.notifyAll();
          else
          if(evt instanceof EndOfMediaEvent || evt instanceof StopAtTimeEvent)
               tidyClose();
     * Inner classes
     * A DataSourceHandler class to read from a DataSource and displays
     * information of each frame of data received.
     class DataSourceHandler implements BufferTransferHandler
          DataSource source;
          PullBufferStream pullStrms[] = null;
          PushBufferStream pushStrms[] = null;
          Buffer readBuffer;
          * Sets the media source this MediaHandler should use to obtain content.
          private void setSource(DataSource source) throws IncompatibleSourceException
               // Different types of DataSources need to handled differently.
               if(source instanceof PushBufferDataSource)
                    pushStrms = ((PushBufferDataSource) source).getStreams();
                    // Set the transfer handler to receive pushed data from the push DataSource.
                    pushStrms[0].setTransferHandler(this);
                    // Set image size
                    imageProfile((VideoFormat)pushStrms[0].getFormat());
               else
               if(source instanceof PullBufferDataSource)
                    System.out.println("PullBufferDataSource!");
                    // This handler only handles push buffer datasource.
                    throw new IncompatibleSourceException();
               this.source = source;
               readBuffer = new Buffer();
          * This will get called when there's data pushed from the PushBufferDataSource.
          public void transferData(PushBufferStream stream)
               try
                    stream.read(readBuffer);
               catch(Exception e)
                    System.out.println(e);
                    return;
               // Just in case contents of data object changed by some other thread
               Buffer inBuffer = (Buffer)(readBuffer.clone());
               // Check for end of stream
               if(readBuffer.isEOM())
                    System.out.println("End of stream");
                    return;
               // Do useful stuff or wait
               useFrameData(inBuffer);
          public void start()
               try{source.start();}catch(Exception e){System.out.println(e);}
          public void stop()
               try{source.stop();}catch(Exception e){System.out.println(e);}
          public void close(){stop();}
          public Object[] getControls()
               return new Object[0];
          public Object getControl(String name)
               return null;
below is the servlet code.
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ShowMovie extends HttpServlet {
String rootURL="http://127.0.0.1:8080/Video/";
public void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
     //String movie=request.getParameter("movie");
     String movie ="son";
     getStart(movie);
          response.sendRedirect(rootURL+"View.jsp");
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
     public void getStart(String url){
          new vid2jpg(url);
this is the error from the server. Im using tomkat 5
exception
javax.servlet.ServletException: Servlet execution threw an exception
root cause
java.lang.NoClassDefFoundError: javax/media/ControllerListener
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(Unknown Source)
     java.security.SecureClassLoader.defineClass(Unknown Source)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1812)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
     java.lang.ClassLoader.loadClassInternal(Unknown Source)
     ShowMovie.getStart(ShowMovie.java:31)
     ShowMovie.processRequest(ShowMovie.java:14)
     ShowMovie.doGet(ShowMovie.java:22)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.

How can i run a java class file from shell?

Hi all,
I've a .class file named "File" that contains Main method, it is in the package "File2".
How can I run it by shell command?
PS: "java -cp . file" doesn't work it launch->
Exception in thread "main" java.lang.NoClassDefFoundError: File2/File (wrong name: File2/File)
Thanks in advance.

Just to understand: is File2 ar jar archive or not? If it is a jar archive, have you tried open File2.jar? If File2 is a directory within the current directory, have you tried java -cp . File2/File? I just tested with a set of classes and it works... Let me be precise:
* Let us imagine you are working in a directory whole path is PathToDir/
* in this directory you have the classes put in a directory called File2
* in order to launch File.class then you would have to invoke :
cd PathToDir/ (just to be sure)
java -cp . File2/File
*if you were to do the following then you would have the problem you describe
cd PathToDir/File2/
java -cp . File

How to run java source files from other java files??

hello all,
i need to run 3 to 4 .java files (first.java,second.java,third.java) from one file.
i tried the
Runtime.getRuntime().exec(cmd); but here cmd must be an exe file.
NOTE THAT i need to run the first.java file ,second.java file each time to generate their .class files(ie I NEED TO COMPILE THEM ALL TIMES AND THEN RUN THEM)
PLZ. help me if this can be done,
warm regards,
Vishal.

One way to do this is to put all your commands into a batch file (this is Windows?) try unix shell otherwise. Anyway here's an example .bat file called cmplrun.bat:
@echo off
javac -classpath . TestCase*.java
java -cp . TestCase01
java -cp . TestCase02
java -cp . TestCase03Then the Java pgm can look like this:
import java.io.*;
public class RunProcess {
public static void main(String[] arg) {
    try {
      Process myProcess;
      myProcess = Runtime.getRuntime().exec("cmd /c cmplrun");
      String s = null;
      DataInputStream in = new DataInputStream(
                           new BufferedInputStream(
                               myProcess.getInputStream()));
      while ((s = in.readLine()) != null) {
        System.out.println(s);
      System.exit(0);
    catch (IOException e) {
      System.out.println("Exception: "+ e);
      System.exit(-1);
}Just one way to do this, all caveats apply and HTH;
~Bill

How to run a class file from windows ?

hi, i have created a shorcut to run my java application from my windows desktop, but i have the error message "Couldn't find the main class, programm will exit",
the shortcut is as follow
[%windir%\System32\javaw.exe C:\ProgramFiles\\Main]
thanks for you help,

Im new to running java from a shortcut but this may help. I hope this helps.
this is the command you ned to write and refer to my example;
javaw.exe -cp <path to class file> packageName.className
This is an example of wat i have typed to run my program from a shortcut;
C:\JBuilder3\java\bin\javaw.exe -cp C:\jbuilder3\myclasses\welcome.jar welcome.welcome
Hope this helps
good luck!!!
Matx3001

Trying to run a bat file from oracle

I have followed these steps, see bottom for results, everything is valid but the bat file does not run???? PLease need your help. Doug
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "getbatx" AS
class getbatx //class pdfopen
public static void execmd(String c) //main function
try
System.out.println("Executing:" + c);
Runtime.getRuntime().exec("C:\\WINDOWS\\system32
cmd.exe /c "+c);
System.out.println("Executing:" + c + " ...done");
} catch (Exception e) //catch any exceptions here
System.out.println("Error" + e ); //print the error
CREATE OR REPLACE PROCEDURE host_command2 (p_command IN VARCHAR2)
AS LANGUAGE JAVA
NAME 'getbatx.execmd (java.lang.String)';
/Then as sysdba I put in in the following.
exec dbms_java.grant_permission( 'CAPRS', 'SYS:java.io.FilePermission', '<<ALL FILES>>', 'execute' );
EXEC Dbms_Java.Grant_Permission('CAPRS', 'SYS:java.lang.RuntimePermission', 'writeFileDescriptor', '');
EXEC Dbms_Java.Grant_Permission('CAPRS', 'SYS:java.lang.RuntimePermission', 'readFileDescriptor', '');Then I make the call.
SET SERVEROUTPUT ON SIZE 1000000
CALL DBMS_JAVA.SET_OUTPUT(1000000);
BEGIN
host_command2 (p_command => 'c:\mybook.bat');
END;
/***** I run this, it completes but does not run the bat file and there is no error message
SQL> BEGIN
2 host_command2 (p_command => 'mybook.bat');
3 END;
4 /
Executing:mybook.bat
Executing:mybook.bat ...done
PL/SQL procedure successfully completed.

Yes it should open a dos box, but you forgot to add the .bat file witch you like to run: String[] command = {"cmd", "/c", "start", "c:/Batch files/Cardiobackup/cardiobackup_v1.4"}

How to call java class file from jsp

hi
we need to call java classes (which are written separately in .java file )from jsp file. we need it for our project if anyone knows about please reply us.
bye
siva sankari

you can call the methods in a lot of ways. you could use scriptlets with the
<%@ page import="package.class"%> and then inside instantiate an object
<%
MyClass mc = new MyClass(parameters if any);
mc.theMethodYouWantToCall();
%>or as Madathil has stated,
or use the JSP tags
<jsp:useBean id="anyname" class="classname"/>and then use the getProperty tag
or even Custom Tags

Can't run java .class programs from Windows command line!

I have tried to get a program that I wrote with the JDK to run from the Windows command line, but it is not working. I typed:
java HelloWorld
Where my .class was HelloWorld.class, a compiled java program. I spelled the name correctly (and I am in the correct directory), yet I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld
I think something is screwy with windows, but that's just me. Any ideas??

Likely a CLASSPATH issue - try
java -classpath . HelloWorldGood Luck
Lee

How to create JAVA Class file from an exisitng JAVA file in JDEVELOPER

Hi All,
I have a file called abc.java and i need to generate a class for the same using JDEVELOPER. Please help me what are the steps to be followed. I'm totally new to JAVA and first time working on JDEVELOPER tool.
Thanks in Advance !

Being completely new to something is not an argument (or shall we be honest: an excuse?) to not read the manual.
Just to note: I would pick Eclipse or Netbeans if you're completely new to java. You'll have more chance of finding help either in forums, mailing lists or Google searches. But if you must stick with JDeveloper, the forum is here:
JDeveloper and ADF

Error comming in running java class file

Exception in thread "main" java.lang.NoClassDefFoundError: Main (wrong name: jav
aapplication2/Main)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)what is the meaning of this error

Hi bhavishya,
Is this the correct path of your Main class : javaapplication2/Main ?

Loading Java Class File in JSP page

I'm trying to load a java class file from a jsp page.
(e.g. MyFile.java <-- Source "MyFile.class<--Class file of MyFile.java")
jsp page
<%@ include file = "MyFile.class" %>
<HTML> // HTML Tags are here
MyFile.java
A normal java source file that has "public static void main" in it.
My jsp page can display it's contents, 'except' for showing e.g. "1235%%215648%%public%%$$@##" through out the page...
My guess is that it can't display my java class file..
Can anyone please help me solve this problem of mine ?
Thanks in advance : )
Yours Sincerely,
RainbowEnergies

This is my JSP file.
<HTML>
<HEAD>
<TITLE>Activity Games</TITLE>
</HEAD>
<%
String name = "";
String id = "";
name = session.getAttribute("name").toString();
session.setAttribute("name",name);
id = session.getAttribute("id").toString();
session.setAttribute("id",id);
%>
<BODY bgcolor="#cc99ff" text="#000000" link="#E3E3E3" vlink="#CCCCCC" alink="#FF0000">
<H3><%=name%>, you have enter Activity Games</H3>
<%@ page import="Games.Lufia.*" %>
<%Lufia lufia = new Lufia();%>
</BODY>
</HTML>
After I execute...
An error occurred at line: 18 in the jsp file: /jsp/ActivityGames.jsp
error: File C:\Program Files\Apache Tomcat 4.0\webapps\website\WEB-INF\classes\Games\Lufia\Lufia.class does not contain type Games.Lufia.Lufia as expected, but type Lufia. Please remove the file, or make sure it appears in the correct subdirectory of the class path.
Generated servlet error:
C:\Program Files\Apache Tomcat 4.0\work\Standalone\localhost\website\jsp\ActivityGames$jsp.java:85: Class Games.Lufia.Lufia not found.
Lufia lufia = new Lufia();
But if I comment this out....
This is my JSP file.
<HTML>
<HEAD>
<TITLE>Activity Games</TITLE>
</HEAD>
<%
String name = "";
String id = "";
name = session.getAttribute("name").toString();
session.setAttribute("name",name);
id = session.getAttribute("id").toString();
session.setAttribute("id",id);
%>
<BODY bgcolor="#cc99ff" text="#000000" link="#E3E3E3" vlink="#CCCCCC" alink="#FF0000">
<H3><%=name%>, you have enter Activity Games</H3>
<%@ page import="Games.Lufia.*" %>
<%//Lufia lufia = new Lufia();%> <--- comment this out.... (HERE)
</BODY>
</HTML>
The page shows but did not run my java class file..
Thanks again for trying to help me solve this problem of mine. : - )
Regards,
RainbowEnergies

Trying to run java class files from my jsp

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