Java.Lang.Unsatisfiedlinkerror No *****.Dll in Java.Library.Path

java.lang.UnsatisfiedLinkError no *****.dll in java.library.path

In order for System.loadLibrary() to work, the library (on Windows, a DLL) must be in a directory somewhere on your PATH or on a path listed in the java.library.path system property (so you can launch Java like java -Djava.library.path=/path/to/dir).

Additionally, for loadLibrary(), you specify the base name of the library, without the .dll at the end. So, for /path/to/something.dll, you would just use System.loadLibrary("something").

You also need to look at the exact UnsatisfiedLinkError that you are getting. If it says something like:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no foo in java.library.path

then it can't find the foo library (foo.dll) in your PATH or java.library.path. If it says something like:

Exception in thread "main" java.lang.UnsatisfiedLinkError: com.example.program.ClassName.foo()V

then something is wrong with the library itself in the sense that Java is not able to map a native Java function in your application to its actual native counterpart.

To start with, I would put some logging around your System.loadLibrary() call to see if that executes properly. If it throws an exception or is not in a code path that is actually executed, then you will always get the latter type of UnsatisfiedLinkError explained above.

As a sidenote, most people put their loadLibrary() calls into a static initializer block in the class with the native methods, to ensure that it is always executed exactly once:

class Foo {

    static {
        System.loadLibrary('foo');
    }

    public Foo() {
    }

}

java.lang.UnsatisfiedLinkError: no frmjapi in java.library.path

The reason is that obviously your library behind the scene relies on a native library at runtime, so you need to add the root directory of the file frmjapi.dll to java.library.path as suggested in your error message by adding -Djava.library.path=c:\some\path\to\my\dll\parent\dir in your VM arguments (cf. Run Configuration).

What is frmjapi.dll?

frmjapi.dll is a file from Oracle Corporation which is part of Oracle
Developer. frmjapi.dll is located in doracledev10g\bin\frmjapi.dll.

Why am I getting this UnsatisfiedLinkError with native code?

@mmyers Thank you for responding. We found out that all we had to do was change System.loadLibrary to System.load and pass the full path + filename as argument, worked like a charm.

Even before doing so, we tried using the "-D" parameter and setting LD_LIBRARY_PATH but we weren't successful.

Go figure! :)

Thanks again,
Karen

java.lang.UnsatisfiedLinkError: no opencv_java2411 in java.library.path

-Djava.library.path shouldn't point to the DLL, but to the folder containing the DLL. e.g. -Djava.library.path=D:/Projects/lib/opencv/x86/

java.lang.UnsatisfiedLinkError even on setting -Djava.library.path

System.loadLibrary expects library name, not a path. The path to the directory containg the library should be set in PATH (Windows) env variable or in -Djava.library.path

Java unsatisfied link error no HelloWorld in java.library.path

This should happen because when you run your Java program, it cannot find the HelloWorld shared library (.dll, .so... depending on your OS).

Try this to check where the JVM expects you to put the shared library, and place it in one of the directories you see:

System.out.println(System.getProperty("java.library.path"));

Generally, the working directory is a safe choice.

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