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java.lang.UnsatisfiedLinkError: com.example.program.ClassName.foo()L

I can't run methods of a library.
My library is in my PATH and also getting loaded without errors by following code:
System.loadLibrary("FTDIInterface");
But the functions are not working.
I get the following exception:
Caused by: java.lang.UnsatisfiedLinkError: Messgeraet.src.net.sf.yad2xx.FTDIInterface.getDevices()[LMessgeraet/src/net/sf/yad2xx/Device;
at Messgeraet.src.net.sf.yad2xx.FTDIInterface.getDevices(Native Method)
at Messgeraet.src.Emu.EmuConnection.<init>(EmuConnection.java:22)
at Messgeraet.src.Emu.EmuModel.connect(EmuModel.java:27)
at Messgeraet.src.JavaFX.FXController.connect(FXController.java:112)
... 62 more
I am using eclipse. In IntelliJ it is working fine and I also got another eclipse project that includes the library without any problems.
Why it can't run my method FTDIInterface.getDevices?

Your package seems off; Messgereat.src sounds like you have a project dir named Messgereat, within you have a folder named 'src' with your java sources, and you've misconfigured your build tooling; the right package name sounds like it should be: package net.sf.yad2xx;, but due to a misconfigured build it wasn't working and you decided to fix the problem by updating your package statements, but that broke your JNI bindings.
The solution would then be to undo all the changes you've made to your package statements, and fix your build script instead.
Alternatively, if you really do intend to use that bizarre package, then make sure you have executed javah with the exact same build setup and use that as a basis for your JNI code. If you've done that, include the exported symbols in the library as the comment by #user2543253 suggested.
NB: It's a bit odd that your loadLibrary call works at all; PATH has nothing to do with it, but presuambly then your library so happens to be located in a place that is listed on your librarypath, which is the system property (of the VM, not of your OS) named 'java.library.path'; you set it with e.g.:
java -Djava.library.path=/path1:/path2 -cp /path/to/dep1.jar:/path/to/dep2.jar com.foo.Main
because of this confusion it is also possible that some different native lib file also named FTDIInterface is being loaded instead of the one you think is being loaded. If you want to be certain of what is being loaded, run System.load("/absolute/path/to/the/dll-jnilib-or-so-libraryfile.so"); - then you know for sure.

Unsatisfied link error when calling from NetBeans package

I have developed a linux shared library to communicate with pos terminals. The library has been developed using C language, and the routines are imported in to a java program using JNI interface. I have tested the library with the simple Java class it works perfectly.how ever when I try to develop a front end java application using netbeans it pops up Unsatisfied link error . so i recompiled the library with the package name embedded in ever function call with in the shared library and the issue was resolved. I found the package name causes the specific error. Is there a way to come out from this problem. because I cant ask the client to keep the package name static. it should be able to change as they need. I tried several compiler and linker directive but failed ..The current working library has been compiled using the following command
gcc -shared -o libecr.so -fpic ecr.c -lusb-1.0
This compiles with no errors in Fedora 14.
libecr.so is my shared library
ecr.c is the source code file
lusb is the libusb which is referenced by ecr code

No class located error in Matlab while calling java class

I have developed an Matlab code for stegnography which requires some preprocessing to be done by a Java file.
The java file aes1.java contains the function encrypt(String s) which needs to be called by matlab code:
javaaddpath('C:\Users\Aneesh\Desktop\BE_Project');
disp(char(javaMethod('hash', 'aes1', userText)));
I am getting the following error:
Error using javaMethod
No class aes1 can be located on the Java class path
Error in project_mod (line 11)
disp(char(javaMethod('hash','aes1',userText)));"
Versions I'm using:
Matlab 2013a
Java 1.6
Any help would be greatly appreciated!
Update:
I have a .jar file which contains all the classes i need. I've imported it and tried using it but I'm still getting the same error!

Please take a look at the documentation. javaaddpath adds one or more folders of java Archive (jar) files.
You need to compile your java file to a class-file and add it using javaclasspath

Getting ClassNotFound Exception for class MkActivityMethod

I am trying to use JackRabbit lbrary for SVN chekin operation.
What I run my code through individual program this works fine. But when I run using web based project it doesn't work.
Code compiles fine but gives me runtime exception at following line :
MkActivityMethod activityMethod = new MkActivityMethod(url);
The exception is :
java.lang.NoClassDefFoundError: org/apache/jackrabbit/webdav/client/methods/MkActivityMethod
My project has jackrabbit-standalone-2.6.4.jar included in my eclipse jars as well as in project web-Inf/lib folder
Please let me know where I am going wrong.

There is obviously something wrong with your classpath. What Web Server Are You Using?

Here is my solution :
Try to build the project once again
Check the JDK version for the builder and Server JRE
Try clean the project (In eclipse , Project menu -> Clean )
Reason :
After you compile your code, you end up with .class files for each class in your program. These binary files are the bytecode that Java interprets to execute your program. The NoClassDefFoundError indicates that the classloader, which is responsible for dynamically loading classes, cannot find the .class file for the class that you're trying to use. It probably indicates that you haven't set the classpath option when executing your code. This link explains how to set the classpath when you execute.

Could not locate Clojure resource on classpath

I am trying to access some of my clojure functions in my Java code (I am using Eclipse and CounterClockWise). Firstly, I was not sure how to do it? But then I found some answer here.
I am using clojure.lang.RT package for calling .clj files in my Java code. While naming namespaces, .clj files proper conventions has been followed like ns test.clojure.core is in test.clojure package where-in core is .clj file. Also upon following some information, I have added java-source-path (i.e. java-source-path src/test/java) and source-path (i.e. source-path src/test/clojure) in my project.clj.
But, when I run my Java file following error is given - a) Could not locate Clojure resource on classpath b) Attempting to call unbound fn.
Please if anyone in community could help me (assuming I am absolute beginner) through detailed procedure or tutorial I would be grateful, as only information I could get (for using clojure.lang.RT) is very little.
Looking forward to get a complete answer to end my frustration.

I guess you are using RT.loadResourceScript which is causing the proble.
You can try out something like this:
//Load the namespace
RT.var("clojure.core","eval").invoke(RT.var("clojure.core","read-string").invoke("(use 'test.clojure.core)"));
//Find a function in namespace
IFn fn = (IFn)RT.var("test.clojure.core","hello");
//Call that function
fn.invoke();