JNI header in cmd prompt

Question

I am trying to make an header for JNI This is the code in java:

package javaapplication2; public class JavaApplication2 {

public static void main(String[] args) {
    JavaApplication2 obj=new JavaApplication2();
    obj.print();

    // TODO code application logic here
}

private native void print();

}

The cmd prompt command is

cd C:\Users\ABC\Documents\NetBeansProjects\JavaApplication2

javah -o head.h-jni-classpath../../build/classes javaapplication2.JavaApplication2.java

It shows these errors

Exception in thread "main" java.lang.IllegalArgumentException: directories not supported at com.sun.tools.javac.file.RegularFileObject.(RegularFileObject.java:70) at com.sun.tools.javac.file.RegularFileObject.(RegularFileObject.java:64) at com.sun.tools.javac.file.JavacFileManager.getJavaFileObjectsFromFiles(JavacFileManager.java:785) at com.sun.tools.javah.JavahTask.run(JavahTask.java:463) at com.sun.tools.javah.JavahTask.run(JavahTask.java:329) at com.sun.tools.javah.Main.main(Main.java:46)

`javah -o head.h-jni-classpath../../build/classes` <-- Why are there no spaces before `-jni` and `-classpath`? — Michael, Oct 02 '18 at 14:32
Bacause when I put spaces it shows unknown option: -classpath../../build/classes — Dharna Khandelwal, Oct 02 '18 at 15:16
So put a space between `-classpath` and the path, as [the documentation](https://docs.oracle.com/javase/8/docs/technotes/tools/windows/javah.html) suggests. — Michael, Oct 02 '18 at 15:23

score 0 · Answer 1 · answered Oct 02 '18 at 16:27

0

Note that javah is deprecated. With JDK 8 or higher you can use javac -h. It's also easier:

cd C:\Users\ABC\Documents\NetBeansProjects\JavaApplication2\javaapplication2
javac -h .. JavaApplication2.java

answered Oct 02 '18 at 16:27

Alex Cohn

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How do I add the name of the header in the command? Like I have used head.h above. – Dharna Khandelwal Oct 02 '18 at 19:15
The header file name will be generated. You can rename the header yourself later. – Alex Cohn Oct 02 '18 at 21:17

JNI header in cmd prompt

1 Answers1