What is LD LIBRARY PATH and how to use it

Question

I take part in developing a Java project  which uses some C   components  thus I need Jacob dll   on Windows 7   I keep getting java lang UnsatisfiedLinkError  no JacobDB in java library path no matter where I put Jacob dll      I looked for possible decisions and the one that I haven t tried so far is setting the LD LIBRARY PATH variable  pointing at the  dll file   I have little experience and I m not familiar with what should be the meaning and usage of that variable - can you help me

User · Answer

Well  the error message tells you what to do  add the path where Jacob dll resides to java library path  You can do that on the command line like this   java -Djava library path  dlls         assuming Jacob dll is in the  dlls  folder   Also see java lang UnsatisfiedLinkError no       dll in java library path

User · Answer

My error was also related to not finding the required  so file by a service  I used LD LIBRARY PATH variable to priorities the path picked up by the linker to search the required lib   I copied both service and  so file in a folder and fed it to LD LIBRARY PATH variable as  LD LIBRARY PATH     service   being in the same folder I have given the above command and it worked

User · Answer

LD LIBRARY PATH is the predefined environmental variable in Linux Unix which sets the path which the linker should look in to while linking dynamic libraries shared libraries     LD LIBRARY PATH contains a colon separated list of paths and the linker gives priority to these paths over the standard library paths  lib and  usr lib  The standard paths will still be searched  but only after the list of paths in LD LIBRARY PATH has been exhausted   The best way to use LD LIBRARY PATH is to set it on the command line or script immediately before executing the program  This way the new LD LIBRARY PATH isolated from the rest of your system   Example Usage       export LD LIBRARY PATH   list of library paths  another path      program     Since you talk about  dll you are on a windows system and a  dll must be placed at a path which the linker searches at link time  in windows this path is set by the environmental variable PATH  So add that  dll to PATH and it should work fine

User · Answer

Typically you must set java library path on the JVM s command line   java -Djava library path  path to my dll -cp  my classpath goes here MainClass

User · Answer

LD LIBRARY PATH is Linux specific and is an environment variable pointing to directories where the dynamic loader should look for shared libraries   Try to add the directory where your  dll is in the PATH variable  Windows will automatically look in the directories listet in this environment variable  LD LIBRARY PATH probably won t solve the problem  unless the JVM uses it - I do not know about that

User · Answer

LD LIBRARY PATH is the default library path which is accessed to check for available dynamic and shared libraries  It is specific to linux distributions   It is similar to environment variable PATH in windows that linker checks for possible implementations during linking time

[java] What is LD_LIBRARY_PATH and how to use it?

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