Compile and run a java program thru ant

[srinivasrao marri]

Hi
i am able to compile my java program thru ant, but its failing to run it. For compiling
<target name="build">
<javac srcdir="." />
<java classname="${main}" classpath="${classpath}"/>
</target>
Can any one tell the same for running the java class file.
Thanks
Srinivas

[Kieran Bee]

What are the error messages? What are the values of 'main' and 'classpath'. Is the xml you gave supposed to compile and run the code, or just compile it? From the ant manual, running a java class goes something like:

 <java classname="test.Main">
         <arg value="-h"/> 
         <classpath>
           <pathelement location="dist/test.jar"/>
           <pathelement path="${java.class.path}"/>
         </classpath>
       </java>
 

[srinivasrao marri]

hi
my java code is
class test{
public static void main(String args[]) {
System.out.println("welcome to ant");
}
}
and i made it to compile thru ant and the code is for build.xml file i written is
<?xml version="1.0"?>
<!-- build file for lesson 1 -->
<project name="tutorial" default="build" basedir=".">
<target name="build">
<javac srcdir="." />
<java classname="${main}" classpath="${classpath}"/>
</target>
</project>
for the same program if i want to make it run what kind of line of code i need to add for build.xml?
Thanks
srinivas

[Kieran Bee]

I'm guessing that the values of 'classpath' and 'main' are not set. In which case

<target name="build">
<javac srcdir="." />
<java classname="test" classpath="."/>
</target>  

should work.

[sai murali]

change your build.xml as follows:
<?xml version="1.0"?>
<project name="test" default="main" basedir=".">
<property name="src" value="." />
<property name="build" value="." />
<path id="project-classpath">
<pathelement location="."/>
<pathelement location="${build}"/>
</path>
<target name="init">
<tstamp/>
</target>
<target name="compile" depends="init">
<javac srcdir="${src}" destdir="${build}" />
</target>

<target name="run">
<java classname="test" fork="yes" >
<classpath refid="project-classpath" />
</java>
</target>

<target name="main" depends="compile,run" />
</project>
and try again.

[srinivasrao marri]

i made my class public, with this my build.xml is running fine, the code i mentioned above is the one i used. i hope the reason to make my class public is , the ant itself if a java class file and its try to use another class file, if i declare it as public , then it can have access to it. i welcome any further discussion on this.
thanks
srinivas

[Kieran Bee]

You can't run a method on a non-public class in the way it is invoked through Ant, that includes the Main method

[srinivasrao marri]

u mean to say this way:
class HelloWorld{
void method1(){
System.out.println("i am in method 1");
}
public static void main(String args[]){
HelloWorld hw=new HelloWorld();
hw.method1();
}
}
o/p:
i am in method 1
this i did without ant....
could u pls elaborate u'r sentence...
Thanks
srinivas
[ February 25, 2003: Message edited by: srinivasrao marri ]

[Sri Kor]

I have similar problem. When I tried to run my java application with Ant build file, My application opens and closes immidiately.
I think, ant is killing the process immediately.Any comments
Thanks

[srinivasrao marri]

send ur build file so that we can exactly come to know the problem