android - javah doesn't find my class

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I am having troubles generating the C header file for JNI using javah.

Here's the script I use while standing in the <project-dir>\bin directory:

javah -classpath C:\PROGRA~2\Android\android-sdk\platforms\android-8\android.jar com.test.JniTest

As return I get:

ERROR: Could not find class file for 'com.test.JniTest'.

Even though the class JniTest certainly is in \com\test.

What am I doing wrong?

android java-native-interface android-ndk javah

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edited Oct 3 '11 at 13:38

Joachim Sauer

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asked Oct 3 '11 at 13:26

KaiserJohaan

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3 Answers

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18

 

You specify the classpath to contain only android.jar.

You also need to include the location where your classes are stored. In your case it is the current directory, so you need to use . (separated by ; on Windows). The invocation should look like this:

javah -classpath C:\PROGRA~2\Android\android-sdk\platforms\android-8\android.jar;. com.test.JniTest

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answered Oct 3 '11 at 13:38

Joachim Sauer

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  just adding, apparently you have to be outside the directory of the actual file. You can't just specify the name of the file. – L7ColWinters Mar 9 '12 at 17:45

• Error: no classes specified errror cant get inside android.jar – Sunil Chaudhary May 23 '16 at 7:48

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18

 

If you are on Linux or MAC-OS, use ":" to separate the directories for classpath rather than ";"character: Example:

javah -cp /Users/Android/android-sdk/platforms/android-xy/android.jar:. com.test.JniTest

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edited Oct 9 '14 at 8:31

Hari Karam Singh

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answered Sep 21 '13 at 5:24

VJ Vélan Solutions

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  that : in linux saved me :P – Sundeep1501 Oct 7 '15 at 10:31

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10

 

You should change the directory to <project-dir>\bin\classes; then, run the following command:

javah -classpath C:\PROGRA~2\Android\android-sdk\platforms\android-8\android.jar;. com.test.JniTest

I'm using the following command file to generate headers: jHdr.cmd on my desktop:

@echo on
SET PLATFORM=android-8
SET ANDROID_SDK_ROOT=C:\Android\android-sdk
SET PRJ_DIR=D:\Workspaces\sqLite\raSQLite
SET CLASS_PKG_PREFIX=ra.sqlite
cd %PRJ_DIR%\bin\classes
javah -classpath %ANDROID_SDK_ROOT%\platforms\%PLATFORM%\android.jar;.  %CLASS_PKG_PREFIX%.%~n1
pause

adjust variables to your needs ... 
put this file on your desktop, then drag you .java file from eclise to jHdr.cmd, result is under %PRJ_DIR%\bin\classes directory