Alloy API resulting in java.lang.UnsatisfiedLinkError

Solution 1:

I tried to reproduce this behavior, but I couldn't. If I don't add MiniSat binaries to the LD_LIBRARY_PATH environment variable, I get the exception you mentioned the very first time I invoke execute_command. After configuring LD_LIBRARY_PATH, the exception doesn't happen.

To configure LD_LIBRARY_PATH:

(1) if using Eclipse, you can right-click on one of your source folders, choose Build Path -> Configure Build Path, then on the "Source" tab make sure that "Native library location" points to a folder in which MiniSat binaries reside.

(2) if running from the shell, just add the path to a folder with MiniSat binaries to LD_LIBRARY_PATH, e.g., something like export LD_LIBRARY_PATH=alloy/extra/x86-linux:$LD_LIBRARY_PATH.

Here is the exact code that I was running, and everything worked

public static void main(String[] args) throws Exception {
    A4Reporter rep = new A4Reporter();

    A4Options options = new A4Options();
    options.solver = A4Options.SatSolver.MiniSatProverJNI;
    
    Module someWorld = CompUtil.parseEverything_fromFile(rep, null, "someFile.als");
    Command command = someWorld.getAllCommands().get(0);
    A4Solution ans = TranslateAlloyToKodkod.execute_command(rep, someWorld.getAllReachableSigs(), command, options);
    System.out.println(ans);
    
    Module someOtherWorld = CompUtil.parseEverything_fromFile(rep, null, "someOtherFile.als");
    Command commandTwo = someOtherWorld.getAllCommands().get(0);
    A4Solution ansTwo = TranslateAlloyToKodkod.execute_command(rep, someOtherWorld.getAllReachableSigs(), commandTwo, options);
    System.out.println(ansTwo);
}

with "someFile.als" being

sig A {}
run { some A } for 4

and "someOtherFile.als"

sig A {}
run { no A } for 4