Unable to load Aspera Library in Ubuntu - ibm-cloud

Question

I am trying to load files from on-prem to IBM Cloud Object Store using Aspera High Speed API. It works fine in Mac, but when the same code is run on Ubuntu 18.0.4 it gives following error.
Failed to load Aspera dynamic library from candidates
[libfaspmanager2.so] at location: /root/.aspera/cos-aspera/0.1.163682
With dependency:
<dependency>
<groupId>com.ibm.cos-aspera</groupId>
<artifactId>cos-aspera-linux-64</artifactId>
<version>0.1.163682</version>
</dependency>
Made sure below env variable is set:
a) export LD_LIBRARY_PATH=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server:/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64
b) export LD_PRELOAD=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/libjsig.so
Using following java:
openjdk version "1.8.0_222" OpenJDK Runtime Environment (build
1.8.0_222-8u222-b10-1ubuntu1~18.04.1-b10) OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)

Answer 1

You can try to decompile the java code that loads the native lib. (e.g using JAD).
You would find that in:
com.ibm.cloud.objectstorage.services.aspera.transfer.AsperaLibraryLoader
Here is the method:
public static void loadLibrary(File extractedPath, List<String> candidates) {
for (String lib : candidates) {
File libPath = new File(extractedPath, lib);
String absPath = libPath.getAbsolutePath();
log.debug("Attempting to load dynamic library: " + absPath);
try {
System.load(absPath);
log.info("Loaded dynamic library: " + absPath);
return;
} catch (UnsatisfiedLinkError e) {
log.debug("Unable to load dynamic library: " + absPath, e);
}
}
throw new RuntimeException("Failed to load Aspera dynamic library from candidates " + candidates + " at location: " + extractedPath);
}
You can try to reproduce the error and get the actual message by compiling:
public class TestLoad { public static void main(String[] args) {
System.load("/root/.aspera/cos-aspera/0.1.163682/libfaspmanager2.so");
}}
On windows, similar problem due to missing dependency for the libfaspmanager2.so lib. which are fixed by setting by adding to PATH the folder where missing libs are.
On Linux check dependencies with:
ldd /root/.aspera/cos-aspera/0.1.163682/libfaspmanager2.so
If there are missing deps, then add folder path to LD_LIBRARY_PATH.
Another note:
The java lib is equipped with Apache commons logging:
https://commons.apache.org/proper/commons-logging/guide.html
So, activate logs, and get better idea.