Invoke jar main method in java code

Question

hi
i have a jar that has a usage like this
java -jar helper.jar arg1 arg2 etc...i want to invoke this helper main method in my java code.i've tried using reflection but it didn't quite work...
String[] args = new String[]{"arg1","arg2"};
Class c = Class.forName("com.helper.MainClass");
Method mainMethod = c.getMethod("main", args.getClass());
int mods = mainMethod.getModifiers();
if(mainMethod.getReturnType() != void.class || !Modifier.isStatic(mods) || !Modifier.isPublic(mods)) {
     throw new NoSuchMethodException("main");
mainMethod.invoke(null, args);
Exception in thread "main" java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at Test.callJarMain(Test.java:50)
at Test2.main(Test.java:34)thoughts???

Answer 1

phychem wrote:
i want to use this jar in a non-static way.
public void useJar(String args[]){
//somehow invoke jar method here...
Sorry, I still don't get it. I don't know what you mean by a non-static way of using jars. The main method for launching an application is static so if you call that method, you will be using a static method. I don't know what you mean by a "jar method" either. Methods are inside classes. So far, all I can guess is you want to invoke a method in a class that happens to be inside a jar. Since people do this all the time without reflection, I don't see the problem.