How can i run Java class form other java application.

Hi ,
I have problem to run java class from my java application,
I am using the class ClassLoader in order to launched the Java class , it�s work fine whenever, the class exist in the same folder , however , when i am trying to run class that is not in the current folder ,
i got error (see below),
Do you have any idea what is wrong?
java.lang.ClassNotFoundException
     at SimpleClassLoader.loadClass(SimpleClassLoader.java:110)
     at SimpleClassLoader.loadClass(SimpleClassLoader.java:53)
     at Run.main(Run.java:31)

What does "run an class" mean? You don't run classes. They're not executables.
I bet your problem is the classpath. You are aware that the classloader looks only there? Unless it's an UrlClassLoader.

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sunnymanman wrote:
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But How can I see both programs printout
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??First of all, you're not even calling the Happy Holiday one. If you want it to do something, you have to invoke it.
And by the way, in your comments, you mention that in one case, a new process is created. Actually, new processes are created each time you call Runtime.exec.
Anyway, if you want the output from the processes, you read it using getInputStream from the Process class. In fact, you really should read that stream anyway (read that URL I sent you to find out why).
If you want to print that output to the screen, then do so as you'd print anything to the screen.
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cross posted
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URGENT PLEASE:How can I run a a class file on the Apache server?

Hi Guys and Gurus,
I am seeking some favor all of experienced gurus, i.e.
How can I run a a class file on the Apache server? Can I run through an Applet?
How can I set Environment variables in Windows2000 Professional Environment?
Actually, I want to extract some records from a MySQL Database running on Apache Server. I wrote a program just to select the columns and show them. It is now a Class file, Now how can I run this class file from the Server???
The code is here
import java.sql.*;
public class RecordShow {
public static void main(String args[]) {
String url = "jdbc:mysql://localhost/myhost";
Connection con;
String query = "select mytable.column," +
"from mytable " +
"where mytable.column = 1";
Statement stmt;
try {
Class.forName("com.mysql.jdbc.Driver");
} catch(java.lang.ClassNotFoundException e) {
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
try {
con = DriverManager.getConnection(url,
"myuser", "mypassword");
stmt = con.createStatement();
ResultSet rs = stmt.executeQuery(query);
ResultSetMetaData rsmd = rs.getMetaData();
int numberOfColumns = rsmd.getColumnCount();
int rowCount = 1;
while (rs.next()) {
System.out.println("Row " + rowCount + ": ");
for (int i = 1; i <= numberOfColumns; i++) {
System.out.print(" Column " + i + ": ");
System.out.println(rs.getString(i));
System.out.println("");
rowCount++;
stmt.close();
con.close();
} catch(SQLException ex) {
System.err.print("SQLException: ");
System.err.println(ex.getMessage());
Please advise... THANKS
VJ

Ehm, I wasn't referring to you at all... read up,
there's a comment by jschell saying that CGI might be
easier/better for his purposes.
Yep.
I know PHP/Perl/whatever might be easier for some
purposes, but only if you happen to know them and want
to/are able to use them. Ok. But you aren't the one asking the question are you. And the person who asked the question seems to have absolutely no familiarity with Apache or applets.
So whatever they do they are going to have to learn a lot.
And that does indeed suggest that in all likelyhood they have not investigated the alternatives.
And for the vast majority of internet applications, especially with smaller projects (obvious this person is not working with a large team), using perl, or something besides java, is going to be the best business solution. It is simpler, and more secure (probably due to the fact that it is simpler.)
Since this is a Java forum, I
answer under the assumption that people have made a
choice one way or another to use a Java solution to
their problem, so I try to solve it in Java first, and
only when that fails (very seldom) do I turn to other
solutions.You approach problems by arbritrarily deciding to try to solve it in java first and only if you fail do you then look to other solutions?
My first step is to try to figure out which of the various avenues is going to cost less. (And a secondary, but non-trivial concern, is then to convince the customer that just because they have heard of a buzz word like 'enterprise bean' that it doesn't mean that is a cost effective solution.) We must come from different worlds.

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 can i run Java class form other java application.

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