Generate, compile, load, execute code on-the-fly

Hi,
I'd like to make something that:
- 1) Generates Java source code (this I can do)
- 2) Compiles this generated source code (I found an unsatisfying solution)
- 3) Loads the newly created classes (I'm stuck here)
- 4) Executes them in this very same program. (That should be trivial once the classes are loaded)
The solution I found for 2) is to invoke the compiler through Runtime.exec(). Isn't there a more integrated solution ?
And for 3), I think there is something to do with a ClassLoader or so, I'll try to figure it out on my own in the meantime.
Thank you,
The Ultimate Koala

see maybe Jakarta BCEL on : http://jakarta.apache.org/bcel/index.html and : http://jakarta.apache.org/bcel/manual.html (Byte Code Engineering Library)

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Try below article
http://social.msdn.microsoft.com/Forums/sharepoint/en-US/70b13a7f-c9f8-4bf9-8229-670472959e60/web-part-error-sandboxed-code-execution-request-failed?forum=sharepointdevelopmentprevious

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I am intending to use jsp as a report engine. The 'templates' should be jsp-code stored in the db, loaded and executed as if they where inside a plain jsp-file in the application. I cannot write new files on the file system since this is prohibited on the production env - so I would like to compile and execute the jsp-code directly in memory.
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Hi,
I have a report region that generates a number of checkboxes using htmldb_item.checkbox. Each checkbox is associated with a date, and what dates are displayed are based on a number of business rules.
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Hi, thanks for sending the link for that plug-in, I can't wait to tell my users so they can start using it... :)
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I'm just curious.
I am in the process of making a bunch of custom Lightweight components which will be a part of a physics tutorial package. (Stuff like arrows, charges, fields, cars, rocks, etc.). I have some specific tutorial applets I am creating for a prof at my local u using these components.
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I'm working with the valueChangeListener and autosubmit="true". I'll try to explain my situation
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jsp:
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doSomethingWithMyObject( new MyObjectW(this)); so it will access to the most actual values from user at the valueChangeEvent
But i really would like some way to execute my code called from the "valueChangeEvent" but after the model has been updated
so i dont need to wrap or implement PhaseListener
what do you think, what do you suggest, have any solution or a way to do what I'm trying?
thank you for your help...
Message was edited by:
akanewsted

Hello Frank, thanks for the response.
When you say
"If you need an updated object in this listener then you can update it from the value change listener as well"
you mean i can update the object by myself with the value from getNewValue()? or is there another way
to call to update the models at this time ?
I know i have the methods "getOldValue()" and "getNewValue()" in the "ValueChangeEvent" but what if i need
the actual value from the user in other control than the one that fires the event
example
Two inputs:
in the input1 the user enters some data
in the input2 when some data is entered it fires valueChangeListener (autosubmit=true)
in that case what if i need the value the user just entered in the input1 in the valueChangeListener of
the input2.
In general the app I'm working must do:
dynamically generate the controls in the form (inputs, selects etc)
Attach the control values to a model ( <af:inputText value=#{model.x}"/>
sometimes execute some script when a value change in a control (valueChangeListener)
those scripts uses the model (and needs to be an updated model)
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if the model is not updated
the script will use old values and will be wrong
or if the script change some value in the model, when the update model phase occurs the value from
the script is lost.
that's why i need to work directly with the model and not the values in the ValueChangeEvent
Is there a way to use something like an action in the change of a control value?
that way the code will execute in the invoke application phase, can this be done ?
how i can execute code in the invoke application when a valueChangeEvent occurs ?
hope this help to explain more my situation.
Thank you for your help and time.

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hi,
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Based on the success on PHP which let me script on the fly,
just recently with the website
http://heroku.com/ that allow to
create ruby on rails applications from a web interface, what if a
apache module or some other of web server, perhaps Adobe
Application server allow via web interface to compile & execute
mxml files on the fly...
This will let everybody to go to a particular website sign-in
then start building applications in the Adobe Cloud...and name
their applications and edit all the mxml code perhaps with an AIR
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I really can't wait to see something like this in adobe take
off....
Best Regards Dino.

Based on the success on PHP which let me script on the fly,
just recently with the website
http://heroku.com/ that allow to
create ruby on rails applications from a web interface, what if a
apache module or some other of web server, perhaps Adobe
Application server allow via web interface to compile & execute
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This will let everybody to go to a particular website sign-in
then start building applications in the Adobe Cloud...and name
their applications and edit all the mxml code perhaps with an AIR
based application.
I really can't wait to see something like this in adobe take
off....
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Does access scope change the way Object oriented code compiles or executes

I have started using Acess Scope (Private/Public/Protected/Friend) in my code and I am wondering if ti changes the way the software is compiled and executed.
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Tim L.
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Hi Timmar,
I don’t think that the Access Scope is the cause of this long pre-load time. However, you can try to set to public in order to see if that makes any change.
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Regards,
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Hello,
For a project, I am developing a simple programming language, with a syntax not unlike Pascal, which compiles to Java Byte Code. Currently I execute the compiled byte code using my own interpreter. This works OK, but what I'd like to do now is to execute the compiled byte code using the actual existing JVM. The compiled byte code resides in a text file upon compilation of a sample program written in my tiny programming language. Does anyone know how I may start to go about this? Thanks in advance.
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<html>
<%
set objConn=server.CreateObject("ADODB.Connection")
objConn.Open application("web_test")
set rs = objConn.Execute( "SELECT acr_id, acr_lastName, acr_final_status from acr_records_grid_view where acr_changeOption = 'A1D1'")
Response.ContentType = "text/xml"
Response.AddHeader "Pragma", "public"
Response.AddHeader "Cache-control", "private"
Response.AddHeader "Expires", "-1"
%>
<?xml version="1.0" encoding="utf-8"?>
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<%While (NOT rs.EOF)%>
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%>
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<%
rs.Close()
Set rs = Nothing
%>
</html>
Thanks.

Thanks, but no; I'm using the correct case and folder.
With this code on the main page, The region flashes the table column header names
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script type="text/javascript" src="SpryAssets/xpath.js"></script>
<script type="text/javascript" src="SpryAssets/SpryData.js"></script
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How to compile and execute a generated file

Hi,
Can somebody help me please? My program goes like this:
I'm creating a program wherein there are two TextArea, left and right, and a button. The role of the left TextArea is where I will type a Java code (what i mean is a class). After typing, the next thing is to press the button. The role of the button, in a user side view, is to show the output of the written java code from the left TextArea to the right TextArea. To have an idea of the program I am creating please refer at this link, http://w3schools.com/html/tryit.asp?filename=tryhtml_tables. This is similar to what im doing.
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I hope somebody could help me regarding this matter. Below is my code I've done:
import java.io.*;
import java.awt.*;
import java.awt.event.*;
public class Test extends Frame implements ActionListener
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private TextArea ta_output; //where the output of the java code will be printed
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private Panel btn_panel;
private Panel ta_output_panel;
private Panel ta_code_panel;
private Panel ta_panel;
private Panel main_panel;
private String str_code;
private String str_output;
public Test()
initialize();
setupObj();
public void initialize()
String text = "public class Testing \n";
text = text + "{\n";
text = text + " \n";
text = text + "public static void main(String args[]) \n";
text = text + "{ \n";
text = text + " //insert your code here \n";
text = text + "} \n";
text = text + "\n";
text = text + "} \n";
ta_code = new TextArea(text);
ta_output = new TextArea();
btn_ExecComp = new Button("Execute Code");
btn_panel = new Panel();
ta_code_panel = new Panel();
ta_output_panel = new Panel();
ta_panel = new Panel();
main_panel = new Panel();
public void setupObj()
btn_ExecComp.addActionListener(this);
btn_panel.setLayout(new FlowLayout());
ta_code_panel.setLayout(new FlowLayout());
ta_output_panel.setLayout(new FlowLayout());
ta_panel.setLayout(new FlowLayout());
main_panel.setLayout(new FlowLayout());
btn_panel.add(btn_ExecComp);
ta_output_panel.add(ta_output);
ta_code_panel.add(ta_code);
ta_panel.add(ta_code_panel);
ta_panel.add(ta_output_panel);
main_panel.add(btn_panel);
main_panel.add(ta_panel);
this.add(main_panel);
this.pack();
this.setVisible(true);
public void actionPerformed(ActionEvent ae)
if(ae.getSource() == btn_ExecComp)
str_code = ta_code.getText();
try
byte[] byte_code = str_code.getBytes();
FileOutputStream fos = new FileOutputStream("Testing.java");
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* How am i be able to compile, run the generated class file and post the output at the right TextArea namely ta_output?
System.out.println("compiling...");
System.out.println("compiling successful");
System.out.println("executing...");
catch(Exception e)
e.printStackTrace();
public static void main(String a[])
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}

Hi All,
After reading Pro*C Question thread I have tried below steps to compile my .C program, but failed with the given errors
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ld: 0711-317 ERROR: Undefined symbol: .sqlcxt
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Generate, compile, load, execute code on-the-fly

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