PRB: Getting "Unsatisfied Link Error" When Using J/Direct (180713)

MORE INFORMATION

1. Make sure your DLL is visible on the system path. DLLs are searched for in the following locations (in order):
   
   
   1. The directory from which the application (typically jview) is loaded
   2. The current directory
   3. The Windows system directory
   4. The Windows directory
   5. The directories listed in the PATH environment variable
2. The Microsoft virtual machine will not attempt to load the DLL until a method requiring it is actually called. Therefore, do not assume that the DLL load was successful simply because the Java class loaded successfully. Check the method qualifiers. Methods declared with the @dll.import directive must be native and static. They can have any level of access (public, private, and so on) supported by the Java language.
3. Make sure that your method name matches the DLL export name exactly, including capitalization. The DLL linking mechanism in Win32 is case-sensitive.
4. If you still have trouble linking to a method, use a utility such as dumpbin /exports (shipped with Visual C++) to verify that the DLL exports the method by the name you are using. Some DLLs may require you to link to exports by ordinal (an integer) rather than a name. In such a case, use the entrypoint override on the method using the "#ordinal" syntax as in the following example:

         // This method is exported as ordinal #34.
         /** @dll.import("MyDll",entrypoint="#34") */ 
         public static native void MySample();
   						

5. Be aware that some so-called functions are actually C macros and the actual DLL export name may be quite different from the name of the macro.
6. Having a single @dll.import directive within a class definition, before all the method declarations inside that class, may also result in an UnsatisfiedLinkError. So try specifying the @dll.import prior to the class definition to set a library name for all native methods declared in that class. For example:

         /** @dll.import("KERNEL32") */ 
         class Test
        {
            public static native int GetEnvironmentStrings();
            public static native int GetEnvironmentVariable(String name,
                                                        StringBuffer value,
                                                        int ccbValue);
         }