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Message:

unable to run 'javac' command thorugh another java file.

Posted by Dhananjay on December 01, 2001 at 11:03 AM

Hi All,
I am facing one problem when I am running a 'javac' command through one java program.
Please, consider the following example to understand my problem.

/**
* This class compiles sample.java
*/
public class test1
{
public static void main(String args[])
{
Runtime a = Runtime.getRuntime();
java.lang.Process P = a.exec("javac sample.java");

System.out.println("After execution of command");

if(P.waitFor()!= 0)
System.out.println("Error while compiling");
else
System.out.println("Commang get excecuted succesfully");
}
}


/**
* This class has to compiled from test1.java
*/
public class sample
{
public static void main(String args[])
{
System.out.println("In the main of sample.java");
}
}

my problem is that in the above mentioned sceanario I get the correct output, but if I purposely make more than 1 error in the sample.java like as follows

/**
* This class has to compiled from test1.java
*/
public class sample
{
public static void main(String args[])
{
System.out.println("In the main of sample.java");
System.out.println(" Value of var1 is :"+ var1); /* error no. 1: var1 is undefined*/
System.out.println(" Value of var2 is :"+ var2); /* error no. 2: var2i is undefined*/
}
}

Now, the execution of test1.java get hanged after printing the statement "After execution of command".
So, I am not able to understand why it is happens. So, if any body have any suggestion/ solution then please let me know as early as possible.
Thanks in advance.

thanks & regards,
Dhananjay Inamdar