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Editorial Team
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Asked: 2026-06-12T06:18:01+00:00

Trying to build a simple helloWorld android/java application with jni c code. I am

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Trying to build a simple helloWorld android/java application with jni c code. I am using Eclipse Indigo on Windows 7. Installed ndk r8 in a non-space path, have the c library finally building fine with ndk-build.cmd. However, the header file generated by javah has unresolved errors,

  • Type ‘jint’ could not be resolved
  • Type ‘JNIEnv’ could not be resolved
  • Type ‘jclass’ could not be resolved

It wasn’t seeing the jni.h include yesterday but after a reboot this morning, that error has disappeared. I had an unresolved JNIEXPORT and JNICALL error as well, but #defining them seems to have solved that. Stuck on the last 3 above.
Have searched google and Stack Overflow for answers but as soon as someone finds a solution they don’t say what that solution was 🙁

I’ve checked the includes in java and c/c++ perspectives in project properties. It seems to be including jni.h directories that I want, I’m using the android-14 for arm platforms. The target is a 4.0.3 IceCream Sanwich (which confusingly is API 15?!). I was going to try and use an AVD for testing this.
I’ve tried closing/reopening the project, deleting from Eclipse and reimporting, but none of that has worked.

Am I missing some includes? Which ones and where should I set them?
Would really appreciate some help.

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1 Answer

  1. Editorial Team

    Recently I’ve faced with the same problem. In my case the problem was that I converted my Eclipse project to C++ project, but I had used C type. So to solve this problem I simply deleted the line <nature>org.eclipse.cdt.core.ccnature</nature> from .project file from the project directory:

    <natures>
 <nature>com.android.ide.eclipse.adt.AndroidNature</nature>
 <nature>org.eclipse.jdt.core.javanature</nature>
 <nature>org.eclipse.cdt.core.cnature</nature>
 <nature>org.eclipse.cdt.core.ccnature</nature>
 <nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
 <nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
 <nature>edu.umd.cs.findbugs.plugin.eclipse.findbugsNature</nature>
</natures>

    Then restart your Eclipse. For more information you can read this.

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