Java should prefer the bundled version of native libs

[simgrid.git] / src / bindings / java / org / simgrid / NativeLib.java

diff --git a/src/bindings/java/org/simgrid/NativeLib.java b/src/bindings/java/org/simgrid/NativeLib.java
index d253847..82c5c12 100644 (file)
--- a/src/bindings/java/org/simgrid/NativeLib.java
+++ b/src/bindings/java/org/simgrid/NativeLib.java
@@ -36,15 +36,22 @@ public final class NativeLib {
        }
        public static void nativeInit(String name) {
                try {
-                       /* prefer the version on disk, if existing */
-                       System.loadLibrary(name);
-               } catch (UnsatisfiedLinkError e) {
-                       /* If not found, unpack the one bundled into the jar file and use it */
+                       /* Prefer the version of the library bundled into the jar file and use it */
                        loadLib(name);
+               } catch (SimGridLibNotFoundException e) {
+                       /* If not found, try to see if we can find a version on disk */
+                       try {
+                               System.loadLibrary(name);
+                       } catch (UnsatisfiedLinkError e2) {
+                               System.err.println("Cannot load the bindings to the "+name+" library in path "+getPath());
+                               e.printStackTrace();
+                               System.err.println("This jar file does not seem to fit your system, and I cannot find an installation of SimGrid.");
+                               System.exit(1);
+                       }
                }
        }
 
-       private static void loadLib (String name) {
+       private static void loadLib (String name) throws SimGridLibNotFoundException {
                String Path = NativeLib.getPath();
 
                String filename=name;
@@ -67,7 +74,7 @@ public final class NativeLib {
                        in =  NativeLib.class.getClassLoader().getResourceAsStream(Path+filename);
                }  
                if (in == null) {
-                       throw new RuntimeException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
+                       throw new SimGridLibNotFoundException("Cannot find library "+name+" in path "+Path+". Sorry, but this jar does not seem to be usable on your machine.");
                }
                try {
                        // We must write the lib onto the disk before loading it -- stupid operating systems
@@ -89,10 +96,7 @@ public final class NativeLib {
                        System.load(fileOut.getAbsolutePath());
 
                } catch (Exception e) {
-                       System.err.println("Cannot load the bindings to the "+name+" library in path "+getPath());
-                       e.printStackTrace();
-                       System.err.println("This jar file does not seem to fit your system, sorry");
-                       System.exit(1);
+                       throw new SimGridLibNotFoundException("Cannot load the bindings to the "+name+" library in path "+getPath(),   e);
                }
        }
 
@@ -121,3 +125,14 @@ public final class NativeLib {
                        System.out.println("This java library will try to load the native code under the following name:\n" +getPath());
        }
 }
+
+class SimGridLibNotFoundException extends Exception {
+       private static final long serialVersionUID = 1L;
+       public SimGridLibNotFoundException(String msg) {
+               super(msg);
+       }
+
+       public SimGridLibNotFoundException(String msg, Exception e) {
+               super(msg,e);
+       }
+}
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