JNI method from static lib in ios?

[Grigory Ptashko]

Yes, I’ve found out about JNI static libraries.

Can you, please, give me the simplest example from JDK9 sources
that implements JNI_OnLoad_<Lib> ? That would help me a lot..

Thank you.

> On 24 марта 2016 г., at 15:00, Bob Vandette <bob.vandette at oracle.com> wrote:
> 
> The JNI specification was updated in SE 8 to support static JNI libraries.
> 
> The key change is around the JNI_OnLoad function.  
> 
> In order for Java to know that a JNI static library is bound to the current executable, 
> you must have a unique JNI_OnLoad_{library} entry point that includes the name of the library.
> 
> Add a JNI_OnLoad_JavaToUIOasteboard entry point to your library when it’s built as a static
> library.  This will allow the ClassLoader to successfully register it as a JNI library when System.loadLibrary
> is called.  Take a look at the SE 8 JNI spec and the JDK9 JDK sources for other examples of these static library 
> entry points.
> 
> Bob.
> 
> 
>> On Mar 24, 2016, at 5:50 AM, Grigory Ptashko <grigory.ptashko at gmail.com> wrote:
>> 
>> Hello.
>> 
>> I'm able to launch jdk9 on ios both on the simulator and device.
>> And also I've managed to remote debug java running in the simulator.
>> 
>> I want to use the JNI method from my java class.
>> I made a static library libJavaToUIPasteboard.a.
>> 
>> I made it a fat library:
>> 
>> Here’s what lipo -info libJavaToUIPasteboard.a outputs:
>> 
>> Architectures in the fat file: libJavaToUIPasteboard.a are: armv7 i386 x86_64 arm64 
>> 
>> 
>> Here's what nm libJavaToUIPasteboard.a outputs:
>> 
>> 0000000000000000 T _Java_EvalJava_stringToUIPasteboard
>>                U _NSLog
>> 0000000000009b20 S _OBJC_CLASS_$_JavaToUIPasteboard
>>                U _OBJC_CLASS_$_NSObject
>> 0000000000009af8 S _OBJC_METACLASS_$_JavaToUIPasteboard
>>                U _OBJC_METACLASS_$_NSObject
>>                U ___CFConstantStringClassReference
>>                U __objc_empty_cache
>> 0000000000009ab0 s l_OBJC_CLASS_RO_$_JavaToUIPasteboard
>> 0000000000009a68 s l_OBJC_METACLASS_RO_$_JavaToUIPasteboard
>> 
>> Just copying this file to app wrapper folder and also specifying the
>> java.library.path gives java.lang.UnsatisfiedLinkError: no JavaToUIPasteboard in java.library.path.
>> I tried both System.loadLibrary("JavaToUIPasteboard") and System.loadLibrary("libJavaToUIPasteboard").
>> They both produce UnsatisfiedLinkError.
>> 
>> I'm a bit confused. How can I use this static lib from my class via JNI.
>> 
>> Thank you.
>> 
>> --
>> Best regards,
>> Grigory Ptashko
>> 
>> +7 (916) 1489766
>> grigory.ptashko at gmail.com
>> facebook.com/GrigoryPtashko
>> 
> 


--
Best regards,
Grigory Ptashko

+7 (916) 1489766
grigory.ptashko at gmail.com
facebook.com/GrigoryPtashko