How to add native library to java library path with Eclipse launch instead of overriding it

Question

I got a native library that needs to be added to java library path  With JVM argument -Djava library path path    I can set the path as I want   My problem is that my other library  pentaho reporting  searches fonts based on the default java library path  including system directories etc  and the manual setting overrides the default path    So   how can I add a path entry to the default java library path instead of overriding it  which seems to be done with -Djava library path    I wouldn t want to add the default path by hand  which wouldn t be nice for the sake of deployment   EDIT  Sorry for missing details  I m working with Eclipse   The deployment is done with JNLP and there I can use  nativelib under resources

User · Answer

SWT puts the necessary native DLLs into a JAR. Search for "org.eclipse.swt.win32.win32.x86_3.4.1.v3449c.jar" for an example.

The DLLs must be in the root of the JAR, the JAR must be signed and the DLL must appear with checksum in the META-INF/MANIFEST.MF for the VM to pick them up.

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For some reason I couldn t get multiple folders to work  well it did for a while but as soon as I needed more dlls and added more folders  none with white spaces in the path   I then copied all needed dlls to one folder and had that as my java library path and it worked  I don t have an explanation - if anyone does  it would be great

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In Windows  like this    -Djava library path  C  MyLibPath  PATH      PATH  is your old -Djava library path

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https   bugs eclipse org bugs show bug cgi id 102239 states that there is no substitution mechanics implemented in Eclipse s launcher  at least no up to release Juno   Thus it is  almost  impossible to append or prepend another library folder to java library path when launching Eclipse without prior knowledge of the default setting   I wrote almost  cause it should be possible to let Eclipse startup  dump the content of java library path and stop Eclipse in one command  The dump would the be parsed and then taken as the input for launching Eclipse  i e      bin bash   get default value of java library path  somehow  default lib path    start dump stop eclipse somehow        now launch Eclipse eclipse --launcher appendVmargs            -vmargs            -Djava library path   my native lib folder   default lib path

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In UNIX systems  you can append to the LD LIBRARY PATH environment variable  On Windows  the JVM automatically sets the system property  java library path  to PATH  so if the dll is on your PATH  then you re set

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On Windows  I have found that the important thing is to start Eclipse from the command line rather than from the Start Menu or a shortcut  provided that the native DLL is in a directory in your PATH  Apparently  this ensures that the proper directory is on the path

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Window- Preferences- Java- Installed JREs  Then choose your current JRE JDK  and click Edit  Fill Default VM Arguments  -Djava library path  usr local xuggler lib  Done

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Can you get round this by calling System load   programmatically to load your native library  This method  unlike System loadLibrary    allows you to specify an absolute path

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Many of the existing answers assume you want to set this for a particular project  but I needed to set it for Eclipse itself in order to support integrated authentication for the SQL Server JDBC driver   To do this  I followed these instructions for launching Eclipse from the Java commandline instead of its normal launcher   Then I just modified that script to add my -Djava library path argument to the Java commandline

User · Answer

On Windows  Add the path to the library to the PATH environment variable  On Linux  Add the path to the library to the LD LIBRARY PATH environment variable  On Mac  Add the path to the library to the DYLD LIBRARY PATH environment variable    java library path is initilized with the values of the variables above on its corresponding platform   This should work on any IDE   You can test if the value is what you expect by calling java -XshowSettings properties

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Had forgotten this issue    I was actually asking with Eclipse  sorry for not stating that originally  And the answer seems to be too simple  at least with 3 5  probably with older versions also    Java run configuration s Arguments   VM arguments   -Djava library path    workspace loc project  lib   env var PATH     Must not forget the quotation marks  otherwise there are problems with spaces in PATH

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The solution offered by Rob Elsner in one of the comments above works perfectly  OSX 10 9  Eclipse Kepler   One has to append their additional paths to that separated by          You could also use   system property java library path       Rob Elsner Nov 22  10 at 23 01

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If you want to add a native library without interfering with java library path at development time in Eclipse  to avoid including absolute paths and having to add parameters to your launch configuration   you can supply the path to the native libraries location for each Jar in the Java Build Path dialog under Native library location  Note that the native library file name has to correspond to the Jar file name  See also this detailed description

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The native library file name has to correspond to the Jar file name  This is very very important  Please make sure that jar name and dll name are same  Also please see the post from Fabian Steeg My download for jawin was containing different names for dll and jar  It was jawin jar and jawind dll  note extra  d  in dll file name  I simply renamed it to jawin dll and set it as a native library in eclipse as mentioned in post  http   www eclipsezone com eclipse forums t49342 html

[java] How to add native library to "java.library.path" with Eclipse launch (instead of overriding it)

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