Generating Java header file error

Question

Sorry for asking but I am having trouble generating a Java header file from my code - in command prompt I typed:

javah -o JNIDemoJava.h -classpath JNIDemoJava/build/classes jnidemojava.Main

From what I've read that should have worked but I get this error:

Error: Could not find class file for 'jnidemojava.Main'.

Before you say I forgot to clean and build to compile it I did, but I still have this error if you need more info just ask .

Update: Problem was solved

What does this have to do with C++ or C languages (per your tags)? — Thomas Matthews, Mar 25 '15 at 00:44
i was going to make a jni project that uses C++ and C code so i thought of adding the tags. if u want i can remove the tags — Wolf Fangs, Mar 25 '15 at 00:54
Is you class called `jnidemojava.Main`, or is it really called `jnidemojava`? Have a look at [this answer to a similar question](http://stackoverflow.com/a/19161596/622391) - you may find it helpful. — Simon MᶜKenzie, Mar 25 '15 at 01:09
the class name is Main and my source package is called jnidemojava. i just followed this https://netbeans.org/kb/docs/cnd/beginning-jni-linux.html as a example and cant get the header file — Wolf Fangs, Mar 25 '15 at 01:28
Does the file `JNIDemoJava/build/classes/jnidemojava/Main.class` exist? The evidence says not. — user207421, Mar 25 '15 at 03:21
Does the directory `./JNIDemoJava` exist in the current directory when you execute this command? The evidence says not. — user207421, Mar 25 '15 at 08:59
i solved it i feel so stupid now but thanks for all the help it worked thanks EJP — Wolf Fangs, Mar 25 '15 at 20:40
Solved it how? If you're not going to tell us, the question has no permanent value here and should be deleted. — user207421, Mar 25 '15 at 20:57
its exactly what you said above i checked and the folder didnt exit — Wolf Fangs, May 27 '15 at 01:18

score 0 · Accepted Answer · answered Mar 25 '15 at 08:27

It seems your command is right. In which platform you run your command? Be cautious to the file separator, it's \ in Windows and / in *NIX.

So in Windows you should

javah -o JNIDemoJava.h -classpath JNIDemoJava\build\classes jnidemojava.Main

In *NIX, you should

javah -o JNIDemoJava.h -classpath JNIDemoJava/build/classes jnidemojava.Main

1 Answers1