Unable to load librocksdbjni-win64.dll in windows10

[ashkrit]

I am using 5.4.5 version or rocksdb on windows 10 https://mvnrepository.com/artifact/org.rocksdb/rocksdbjni/5.4.5

It fails with below error:

Exception in thread "main" java.lang.UnsatisfiedLinkError:c:\XXX\librocksdbjni-win64.dll: A dynamic link library (DLL) initialization routine failed
	at java.lang.ClassLoader$NativeLibrary.load(Native Method)
	at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)
	at java.lang.Runtime.load0(Runtime.java:809)

Has anybody faced similar issue on windows ?

[adamretter]

@ashkrit The file librocksdbjni-win64.dll is included within the Jar file. We need to understand why it won't load on your system, perhaps some missing dependency that you need to install. You could try extracting the .dll from the Jar, placing it in a known path and using a small Java program to try and load it to see if you can get more detailed error messages:

public class LoadTest {
  public static void main(final String args[]) {
    System.loadLibrary("librocksdbjni-win64");
  }
}

Then to compile and run it:

javac LoadTest.java
java -classpath . -Djava.library.path=C:\dir-containing-rocksdb-dll LoadTest

[qzo]

I can confirm the issue. Everything newer than 5.3.6 (which is the last working version) starting with 5.4.5 (including the latest version 5.6.1) fails with a message like

C:\temp5>"c:\Program Files\Java\jdk1.8.0_144\bin\java.exe" -classpath . -Djava.library.path="C:\temp5" LoadTest
Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\temp5\librocksdbjni-win64.dll: A dynamic link library (DLL) initialization routine failed
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
        at java.lang.Runtime.loadLibrary0(Runtime.java:870)
        at java.lang.System.loadLibrary(System.java:1122)
        at LoadTest.main(LoadTest.java:3)

If I use the older versions (like 5.3.6), there's no output.

I'm running Win 10 Version 10.0.15063.

[adamretter]

@qzo Please see my comment above

[qzo]

I have read your comment many times. Not sure what else I can do, there's no more output. As I said, the behavior is different between 5.3.6 (and older versions, which work) and 5.4.5 (and later versions, which don't work).

[adamretter]

@qzo Thanks for your patience, I just tested again. I need to revise the library name in the code above. Also java.library.path should of course point to a directory containing the DLL rather than the DLL itself. Please can you try again with the changes?

[qzo]

Your new version of the LoadTest class is what I've been using from the beginning (I fixed the library name and added the semicolon), so unfortunately I can't tell you anything new. If it's a new problem it might be some incompatibility with the new Windows 10 update ("Creator's Update"). But I'm only guessing. If there's anything else I can try, just tell me.

Just in case: I have latest Visual C++ redistributables (2017 for x86 and x64, 2013 for x86 and x64 and some older versions; trying to install 2015 only results in an error message "another version of this product is already installed").

[adamretter]

@qzo Does -Xcheck:jni shed any further light on the problem?

[adamretter]

Also, could you try dumpbin and depwalker to check you don't have any missing dependencies?

[qzo]

No, -Xcheck:jni doesn't change the output.

I haven't tried dumpbin yet, since I'll probably need to install Visual Studio - I'll do it later, if needed. But I've attached some output from Dependency Walker. I've tried it earlier, but found out, that the API-MS-WIN* errors are probably misleading:
https://social.msdn.microsoft.com/Forums/en-US/a28331ae-19a3-4a34-b3ba-1e8fd4430375/missing-apimswincore-dlls?forum=windowsgeneraldevelopmentissues
https://ofekshilon.com/2016/03/27/on-api-ms-win-xxxxx-dll-and-other-dependency-walker-glitches/

librocksdbjni-win64.txt
librocksdbjni-win64-2.csv.txt

[adamretter]

@qzo I am wondering if it is the version of the C++ redistributable that you have. RocksJava is built using Visual Studio 2015. On my Windows system I have C++ redistributables 2012, 2013 and 2015.

Perhaps you could try uninstalling 2017, installing 2015 and then re-installing 2017? I believe this issue also describes that problem - #2622

I also updated the Wiki with a note here - https://github.com/facebook/rocksdb/wiki/RocksJava-Basics#maven-windows

[qzo]

Didn't help. After uninstalling 2017 redistributables, I got a different error (with the same stacktrace):
Can't find dependent libraries

Then after installing 2015 redistributables, I again got
A dynamic link library (DLL) initialization routine failed
Then after installing 2017 redistributables, again:
A dynamic link library (DLL) initialization routine failed

Then I checked "Programs and Features" in Control Panel and 2015 redistributables are again missing from the list...

I'll try dumpbin tomorrow.

EDIT: I ran dumpbin:

C:>"c:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.11.25503\bin\HostX64\x86\dumpbin.exe" /DEPENDENTS c:\temp\rocksdb\librocksdbjni-win64.dll
Microsoft (R) COFF/PE Dumper Version 14.11.25506.0
Copyright (C) Microsoft Corporation. All rights reserved.

Dump of file c:\temp\rocksdb\librocksdbjni-win64.dll

File Type: DLL

Image has the following dependencies:

RPCRT4.dll
MSVCP140.dll
VCRUNTIME140.dll
api-ms-win-crt-runtime-l1-1-0.dll
api-ms-win-crt-stdio-l1-1-0.dll
api-ms-win-crt-string-l1-1-0.dll
api-ms-win-crt-convert-l1-1-0.dll
api-ms-win-crt-time-l1-1-0.dll
api-ms-win-crt-environment-l1-1-0.dll
api-ms-win-crt-filesystem-l1-1-0.dll
api-ms-win-crt-math-l1-1-0.dll
api-ms-win-crt-heap-l1-1-0.dll
KERNEL32.dll

Summary

   14000 .data
    1000 .gfids
   1F000 .pdata
   EC000 .rdata
    3000 .reloc
    1000 .rsrc
  2F4000 .text
    1000 .tls

[vadsh]

I have exactly the same problem described by qzo