Is there an option to create a shared library for Java applications? #63

1. 
   fatefree commented at 10:26 pm on September 16, 2014: none

   It seems there used to be a make target to create a shared library for native use in Bitcoinj (make libjavasecp256k1.so) some time ago, but the latest repo seems to only create a static library. Is there a way to create a shared library that can be used for Java applications?
2. 
   sipa commented at 0:18 am on September 17, 2014: contributor

   @theuni We have a Java JNI wrapper in the source tree, but I doubt the build system supports it?
3. 
   theuni commented at 6:49 am on September 17, 2014: contributor

   @sipa It’s not included now, but I don’t know of any real blocker for it other than locating the jni headers. My only real experience with jni is Android… is there a “typical” way of locating jni headers other than what’s supported by your sdk/ndk/ide?

   I’ll look into it tomorrow.

4. 
   fatefree commented at 12:45 pm on September 17, 2014: none

   I believe they are in JAVA_HOME/include and JAVA_HOME/include/linux or /win32. Thanks very much for your help!
5. 
   fatefree commented at 6:43 pm on September 20, 2014: none

   @theuni Is there any way to modify the original make target to work with the new library as a makeshift solution? Unfortunately I’ve been unable to do so myself, but I am also out of my depth here. Here is the original target:

   libjavasecp256k1.so: $(OBJS) obj/secp256k1.o $(JAVA_FILES) $(CC) -fPIC -std=$(STD) $(CFLAGS) $(CFLAGS_EXTRA) -DNDEBUG -$(OPTLEVEL) -I. src/java/org_bitcoin_NativeSecp256k1.c $(LDFLAGS_EXTRA) $(OBJS) obj/secp256k1.o -shared -o libjavasecp256k1.so

6. 
   theuni commented at 8:47 pm on September 21, 2014: contributor

   See #64
7. 
   sipa commented at 5:18 am on November 28, 2016: contributor

   Fixed by #364.
8. sipa closed this on Nov 28, 2016

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9. real-or-random referenced this in commit 9ecd8bf38a on May 31, 2019

Contributors
fatefree sipa theuni