Can't generate Header File

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I've already .java file
I want to generate .h file using javah -jni command
eg.I have HelloWorld.java in E:\
In Command Prompt
E:\javah -jni HelloWorld.java
I found this error

error: cannot access HelloWorld.java
class file for HelloWorld.java not found
javadoc: error - Class HelloWorld.java not found.
Error: No classes were specified on the command line. Try -help.

Please help me:confused:

Posted 28-Dec-10 17:00pm

Saw Thanda Oo

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RaviRanjanKr · Answer 1 · 2010-12-28T18:17:00

Solution 1

Of-course it will give error because you are using wrong command.
In short you are using HelloWorld.java which is FileName not Class Name.

E:\javah -jni HelloWorld.java   //HelloWorld.java is name of JavaFile not ClassFile

basically you need to know Actual Syntax which is

javah -jni ClassFile

you need to use

E:\javah -jni HelloWorld  //if HelloWorld is your ClassFile.

Hope it Will works for you. :)

Posted 28-Dec-10 18:17pm

RaviRanjanKr

Updated 29-Dec-10 3:28am

v4

Comments

Richard MacCutchan 29-Dec-10 15:35pm

What's the betting there is no reference to any native calls in HelloWorld?

RaviRanjanKr 31-Dec-10 6:42am

Sorry Richard I am not getting What do you mean. be clear!

Saw Thanda Oo · Answer 2 · 2010-12-28T21:32:00

Solution 2

I've already tried.
I try
In Command prompt:
E:\javah -jni HelloWorld.class

I got the same error

error: cannot access test.class
class file for test.class not found
javadoc: error - Class test.class not found.
Error: No classes were specified on the command line. Try -help.

Help me :(

Posted 28-Dec-10 21:32pm

Saw Thanda Oo

Comments

Richard MacCutchan 29-Dec-10 4:43am

I don't quite know what you are doing as the diagnostic message you posted has nothing to do with the command you posted.

However if you re-read the answer given by RaviRanjankr you should note that the command is javah -jni ClassName , NOT javah -jni ClassName.class.

RaviRanjanKr 29-Dec-10 9:26am

O my God! you need to learn the basics of java
why are you using HelloWorld.Class?
See my answer [last Line]

Ali Jafri · Answer 3 · 2014-07-01T22:32:00

I wasted like 3 hours on this. It has been due to some sort of java directory issues or what. Anyways this is how i did it.

Open command line. Go to the exact folder where .java class is located. go there and execute command

Java

javac HelloWorld.java

then go back to the folder containing the complete package. There type this statement for generating the header file from the class file. The directory must be like in my case the whole package was in Java directory file so i went back there and typed the following command.