twall
commented
8 years ago What's happening is that JNI is expecting to find a native method based on the package and class name of the containing Java class. You've effectively renamed the package/class, so JNI's "guess" of the native symbol is now not going to match.
JNA uses JNI's default symbol mapping to find native functions (such as Native.sizeof). You'd have to either avoid "relocating" those specific functions (and running the full suite of JNA tests to ensure you didn't break something else) or rewriting JNA's code which references native functions to do a different type of lookup of native methods (it's possible to take a Java method and explicitly bind it to an explicit native symbol, but it's not clear that would generally be a good thing for JNA to do, even if it makes your life easier in this specific case).
On Tue, Jul 12, 2016 at 12:05 PM, jikuja notifications@github.com wrote:
I tried HelloWorld example from Getting Started Guide and got following results:
Result of shadowjar, no relocation. Works as excepted:
jikuja@LG MINGW64 /d/projects/jna-relocation-bug $ java -Djna.debug_load.jna=true -jar build/libs/jna-relocation-bug-1.0-SNAPSHOT-all.jar Trying (via loadLibrary) jnidispatch Looking in classpath from sun.misc.Launcher$AppClassLoader@4e25154f for /com/sun/jna/win32-x86-64/jnidispatch.dll Found library resource at jar:file:/D:/projects/jna-relocation-bug/build/libs/jna-relocation-bug-1.0-SNAPSHOT-all.jar!/com/sun/jna/win32-x86-64/jnidispatch.dll Trying C:\Users\jikuja\AppData\Local\Temp\jna--1160004128\jna5363526492694878451.dll Found jnidispatch at C:\Users\jikuja\AppData\Local\Temp\jna--1160004128\jna5363526492694878451.dll Hello, World
Shadowjar with relocation. Does not work:
jikuja@LG MINGW64 /d/projects/jna-relocation-bug $ java -Djna.debug_load.jna=true -jar build/libs/jna-relocation-bug-1.0-SNAPSHOT-reloc.jar Trying (via loadLibrary) jnidispatch Looking in classpath from sun.misc.Launcher$AppClassLoader@4e25154f for /a/com/sun/jna/win32-x86-64/jnidispatch.dll Found library resource at jar:file:/D:/projects/jna-relocation-bug/build/libs/jna-relocation-bug-1.0-SNAPSHOT-reloc.jar!/a/com/sun/jna/win32-x86-64/jnidispatch.dll Trying C:\Users\jikuja\AppData\Local\Temp\jna--1160004128\jna2069879652875333160.dll Found jnidispatch at C:\Users\jikuja\AppData\Local\Temp\jna--1160004128\jna2069879652875333160.dll Exception in thread "main" java.lang.UnsatisfiedLinkError: a.com.sun.jna.Native.sizeof(I)I at a.com.sun.jna.Native.sizeof(Native Method) at a.com.sun.jna.Native.
(Native.java:141) at HelloWorld$CLibrary. (HelloWorld.java:13) at HelloWorld.main(HelloWorld.java:20) Build script I used: https://gist.github.com/jikuja/10e29922c819e2a0eb16183a09a14f38
Bug or did I miss some important configuration flag to enable proper shading support?
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PumpkinXD
I tried HelloWorld example from Getting Started Guide and got following results:
Result of shadowjar, no relocation. Works as excepted:
Shadowjar with relocation. Does not work:
Build script I used: https://gist.github.com/jikuja/10e29922c819e2a0eb16183a09a14f38
Bug or did I miss some important configuration flag to enable proper shading support?