I want to execute another Java program in my program. I have taken reference from here. For testing I have pasted same code as accepted answer shows.I have passed a simple HelloWorld program. Program compiles perfectly but gives Main class not found error.
Here is my code: Server.java
public static void main(String args[]) {
try {
runProcess("javac D:\\HelloWorld.java");
runProcess("java D:\\HelloWorld");
} catch (Exception e) {
e.printStackTrace();
}
}
private static void printLines(String name, InputStream ins) throws Exception {
String line = null;
BufferedReader in = new BufferedReader(
new InputStreamReader(ins));
while ((line = in.readLine()) != null) {
System.out.println(name + " " + line);
}
}
private static void runProcess(String command) throws Exception {
Process pro = Runtime.getRuntime().exec(command);
printLines(command + " stdout:", pro.getInputStream());
printLines(command + " stderr:", pro.getErrorStream());
pro.waitFor();
System.out.println(command + " exitValue() " + pro.exitValue());
}
HelloWorld.java:
`public static void main(String args[]){
System.out.println("Hello World!");
}`
Output: exitValue() 0 for javac stderr: Error: Could not find or load main class D:\HelloWorld exitValue() 1 for java
Compiling and running same program on CMD or IDE gives perfect output.
You want to start main from HelloWorld class? I think, in that case you should run program something like this:
java -cp 'D:\' HelloWorld
So, you need to specify ClassPath - 'D:\' and entry class name from classpath - HelloWorld.
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