Java.lang.unsatisfiedlinkerror No In Java.library.path Machine
Java.lang.unsatisfiedlinkerror No In Java.library.path Mac Os
Java.lang.unsatisfiedlinkerror No In Java.library.path Macau

How can I load a custom dll file in my web application? I tried following ways but its failing.

copied all required dlls in system32 folder and tried to load one of them in Servlet constructor System.loadLibrary
Copied required dlls in tomcat_home/shared/lib and tomcat_home/common/lib
all these dlls are in WEB-INF/lib of the web-application

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Java.lang.UnsatisfiedLinkError: mqjbnd (A file or directory in the path name does not exist.) at java.lang.ClassLoader.loadLibraryWithPath(ClassLoader.java:994). Exception in thread 'main' java.lang.UnsatisfiedLinkError: no jdnssd in java.library.path at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682). Problem was that there are no instructions in how to create the dnssd.jar and libjdnssd.so. No jdnssd in java.library.path in. Java.lang.UnsatisfiedLinkError: ars3wapi32 (Not found in java.library.path) To correct this error, add the ODWEK directory to your operating system's respective library path. The default installation locations for ODWEK and each supported operating system's library path are listed below.

In order for System.loadLibrary() to work, the library (on Windows, a DLL) must be in a directory somewhere on your PATHor 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:

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

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:

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The original answer by Adam Batkin will lead you to a solution, but if you redeploy your webapp (without restarting your web container), you should run into the following error:

This happens because the ClassLoader that originally loaded your DLL still references this DLL. However, your webapp is now running with a new ClassLoader, and because the same JVM is running and a JVM won’t allow 2 references to the same DLL, you can’t reload it. Thus, your webapp can’t access the existing DLL and can’t load a new one. So…. you’re stuck.

Tomcat’s ClassLoader documentation outlines why your reloaded webapp runs in a new isolated ClassLoader and how you can work around this limitation (at a very high level).

The solution is to extend Adam Batkin’s solution a little:

Then placing a jar containing JUST this compiled class into the TOMCAT_HOME/lib folder.

Now, within your webapp, you just have to force Tomcat to reference this class, which can be done as simply as this:

Now your DLL should be loaded in the common classloader, and can be referenced from your webapp even after being redeployed.

Make sense?

A working reference copy can be found on google code, static-dll-bootstrapper .

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Changing ‘java.library.path’ variable at runtime is not enough because it is read only once by JVM. You have to reset it like:

Please, take a loot at: Changing Java Library Path at Runtime.

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You can use System.load() to provide an absolute path which is what you want, rather than a file in the standard library folder for the respective OS.

If you want native applications that already exist, use System.loadLibrary(String filename). If you want to provide your own you’re probably better with load().

You should also be able to use loadLibrary with the java.library.path set correctly. See ClassLoader.java for implementation source showing both paths being checked (OpenJDK)

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Java.lang.unsatisfiedlinkerror No In Java.library.path Machine

In the case where the problem is that System.loadLibrary cannot find the DLL in question, one common misconception (reinforced by Java’s error message) is that the system property java.library.path is the answer. If you set the system property java.library.path to the directory where your DLL is located, then System.loadLibrary will indeed find your DLL. However, if your DLL in turn depends on other DLLs, as is often the case, then java.library.path cannot help, because the loading of the dependent DLLs is managed entirely by the operating system, which knows nothing of java.library.path. Thus, it is almost always better to bypass java.library.path and simply add your DLL’s directory to LD_LIBRARY_PATH (Linux), DYLD_LIBRARY_PATH (MacOS), or Path (Windows) prior to starting the JVM.

(Note: I am using the term “DLL” in the generic sense of DLL or shared library.)

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For those who are looking for java.lang.UnsatisfiedLinkError: no pdf_java in java.library.path

I was facing same exception; I tried everything and important things to make it work are:

Correct version of pdf lib.jar ( In my case it was wrong version jar kept in server runtime )
Make a folder and keep the pdflib jar in it and add the folder in your PATH variable

It worked with tomcat 6.

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Poor me ! spent a whole day behind this.Writing it down here if any body replicates this issue.

I was trying to load as Adam suggested but then got caught with AMD64 vs IA 32 exception.If in any case after working as per Adam’s(no doubt the best pick) walkthrough,try to have a 64 bit version of latest jre.Make sure your JRE AND JDK are 64 bit and you have correctly added it to your classpath.

My working example goes here:unstatisfied link error

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If you need to load a file that’s relative to some directory where you already are (like in the current directory), here’s an easy solution:

Java.lang.unsatisfiedlinkerror No In Java.library.path Mac Os

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Java.lang.unsatisfiedlinkerror No In Java.library.path Macau

For windows I found that when i loaded the filles(jd2xsx.dll calls & ftd2xx.dll) into the windowws/system32 folder this resolved the issues. I then had an issue with my newer fd2xx.dll having to do with parameters which is why I had to load the older version of this dll. I will have to ferrit this out later.

Note: the jd2xsx.dll calls the ftd2xx.dll so just setting the path for the jd2xx.dll might not work.

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I’m using Mac OS X Yosemite and Netbeans 8.02, I got the same error and the simple solution I have found is like above, this is useful when you need to include native library in the project. So do the next for Netbeans:

I hope it could be useful for someone.
The link where I found the solution is here:
java.library.path – What is it and how to use

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Tags: dll, java