Reflection. Execution constructor

I need to execute some method via reflection

method to execute

public void someMethod(int value1, int value2, String str, int value3)
{
    try
    {
        // some code
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

This is execution code

public static void execute()
{
    try
    {
        String          className = "some.class";
        String          classPath = "some.pack.name" + ":" + "some.class";
        PathClassLoader loader    = new dalvik.system.PathClassLoader(classPath, ClassLoader.getSystemClassLoader());

        Class           clazz     = Class.forName(className, true, loader);
        Method          method    = clazz.getDeclaredMethod("someMethod", Integer.TYPE, Integer.TYPE, String.class, Integer.TYPE); 
        Object          object    = clazz.newInstance();

        method.invoke(object, 1, 2, "str", 3);
    }
    catch (Throwable e) {e.printStackTrace();}
}

But I gets error

    java.lang.InstantiationException: can't instantiate class someClass; no empty constructor
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1208)

After that I espected constructors for someClass and got this

someClass(android.content.Context,com.android.internal.someClass)
GenericParameterType 0 - class android.content.Context
GenericParameterType 1 - interface com.android.internal.someClass

The question is: how to execute someMethod with given parameters and given generic types?