Can find library java

How to Fix «Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” — Cause and Solution

This error comes in when you are trying to use the JSTL core tag library in your JSP page but the web container is not able to locate corresponding TLD files, also known as tag library descriptors. In order to use the custom tags in the JSP page, the first step is to import them using the @taglib directive and for that purpose, we provide a URI. Many JSP developer thinks this is the location where TLD files are stored but that’s not true, this is actually the value, custom tab library developer has put in the URL field of tag library descriptor. This misunderstanding causes lots of trouble while solving «Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” .

We will see how the web container finds TLD files and what are possible causes for this error in the next section. Another thing to keep in mind particular to this error is that JSTL uses different URL in a different version, for example in JSTL 1.0 the URI for JSTL custom tags were http://java.sun.com/jstl/core» , mind it there was no «/jsp» , but from JSTL 1.1 the URI changed to «http://java.sun.com/jsp/jstl/core» .

So, sometimes, if you have JSTL 1.0 jars in your classpath (under WEB-INF/lib ) folder but specifying URI as «http://java.sun.com/jsp/jstl/core» in taglib directive you get this error.

Btw, if you are new to Servlet and JSP world then you can also check out these free Servlet and JSP courses to learn about JSP and JSTL basics which are important to use these tag libraries in your project.

What is «Can not find the tag library descriptor»

When JSP developer wants to use custom tag they first import it using taglib directive by providing a URI. Web container looks that URI and searches for that in all the tag library descriptors available in the following four locations:

1) Inside the WEB-INF directory of your web application

2) Inside a subdirectory of WEB-INF folder like WEB-INF/TLDs

3) Inside the META-INF directory of a JAR file stored in the WEB-INF/lib folder

4) Inside a sub-directory of META-INF inside a JAR file that’s inside WEB-INF/lib

If a web container doesn’t find that URI then it throws a «Can not find the tag library descriptor» error followed by the URL it is not able to find. So in our case, an error message is «Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” , which means the web container is not able to find TLD files for URI «http://java.sun.com/jsp/jstl/core» , which is for JSTL core tag library version 1.1.

Since JSTL tag libraries are bundled inside standard.jar, you should have that JAR in your Web application’s classpath like WEB-INF/lib . JSTL TLDs for all tags like core,xml SQL, and formatting are actually inside the META-INF folder of standard.jar.

So the first thing you should check is whether standard.jar and JSTL.jar is inside your WEB-INF/lib folder or not, if not please add it by copying it from Tomcat’s example folder or downloading it via Maven, or copying from your build host.

Sometimes you get the error «Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” even after having jstl.jar and standar.jar in your classpath or WEB-INF/lib directly, in that case, please check the version of JSTL and standard.jar.

Since URI is different in JSTL 1.1 and JSTL 1.0, you must use the right version of JAR corresponding to the URI you are using in your JSP page.

This means, If you are using http://java.sun.com/jsp/jstl/core , add JSTL, and standard 1.1 JAR. And

If you are using http://java.sun.com/jstl/core , (no /JSP in URI) then put JSTL 1.0 and standard 1.0 JAR in the WEB-INF lib folder. You can also see these best Servlet and JSP courses to learn more.

Shortcuts

1) Check whether you have standard.jar in your classpath because TLDs are inside that.

2) Check whether standard.jar is inside WEB-INF/lib

3) Check you are using JSTL 1.1 and standard 1.1 JAR because URI «http://java.sun.com/jsp/jstl/core» need JSTL1.1 jar files

4) Use the URI as «http://java.sun.com/jstl/core» if you are using JSTL 1.0 JAR, remember there is no JSP in URI.

That’s all about how to fix the «Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” error in the Java web application. Just remember that URI is different in JSTL 1.1 and JSTL 1.0, you must use the right version of JAR corresponding to the URI you are using in your JSP page and you need to use different versions of JAR files depending upon the URI you are using in the JSP file.

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P. S. — If you are new to Servlet and JSP and looking for some free online courses to start with then you can also check out this list of free Servlet and JSP courses for beginners. They are good to learn the basics of Servlet and JSP.

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java.lang.UnsatisfiedLinkError: Library not found tibrvnative or android

1) First reason, which happens in 90% of scenarios is that the library which you are using directly or indirectly (some external JAR is using native library or native dll e.g. if your Java application is using TIBCO libraries for messaging or fault tolerance then tibrv.jar uses tibrvnative.dll library and throws j ava.lang.UnsatisfiedLinkError: Library not found tibrvnative if that library (the dll ) is not in the path. In order to fix this problem, you need to update your PATH environment variable to include native libraries binary. see last section for more details.

2) The second reason which is bit rare is that the library might not have right kind of permissions e.g. placed under a home directory of a user, which is not accessible. This has only happened to me once when I copied another colleague’s settings to set up my environment and forget to change the PATH of Tibco dll, which was local to him.

This one is rather simple to fix but hard to find, all I need to do is given installation folder a read-write permission for a developer group. Alternatively, you can also copy that dll to your local home directory.

This was the case with core Java application running on Windows and Linux. In Android, there could be another reason of java.lang.UnsatisfiedLinkError , where the library wasn’t built with the NDK. This can result in dependencies on function or libraries that don’t exist on the device.

How to fix java.lang.UnsatisfiedLinkError: Library not found in Java

In order to fix this exception, just check if your PATH contains required native library or not. If PATH contains, then verify java.library.path system property , in case your application is using to find native libraries.

If that doesn’t work, try running your Java program by providing an explicit path of a native library while starting JVM like java -Djava.library.path =» native library path «

If you are working in Linux then check if your native library path exists in LD_LIBRARY_PATH environment variable. You can see it’s valued as $ and can further use grep command to check for your native library.

8 Steps to Solve «Library not found tibrvnative or android» Error in Java

As I said before, the java.lang.UnsatisfiedLinkError with the message «Library not found tibrvnative or android» typically occurs when a Java application is trying to load a native library (a shared library or DLL) using the Java Native Interface (JNI), but the library cannot be found.

Make sure that the native library tibrvnative or android (depending on which library you are trying to load) is available on the system where your Java application is running. The library should be present in a location where the Java runtime can find it, such as in a directory listed in the java.library.path system property or in a directory specified using the -Djava.library.path command-line option.

Ensure that the version of the native library matches the version of the Java runtime and the operating system you are using. If the library is built for a different platform or architecture, it may not be compatible and could result in the UnsatisfiedLinkError.

If the library is available in a directory not listed in the java.library.path, you can add the directory to the java.library.path system property using the -Djava.library.path command-line option when starting your Java application.

Make sure that you are loading the native library correctly in your Java code using the System.loadLibrary() or System.load() method, and providing the correct library name (without file extension and platform-specific prefixes/suffixes).

Verify that all the dependencies of the native library, such as other shared libraries or DLLs, are available and correctly loaded. If any of the dependencies are missing, it can also result in the UnsatisfiedLinkError.

If you are using a Java library that requires the native library, make sure that the library is properly included in your classpath, and that the library and its dependencies are correctly packaged with your application.

Ensure that the system environment variables, such as LD_LIBRARY_PATH or PATH (for Linux/Unix) or PATH (for Windows), are correctly set to include the directories where the native library is located.

If you are using an outdated version of the native library, try updating it to the latest version, as the issue may have been fixed in a newer version.

By following these steps, you can resolve the java.lang.UnsatisfiedLinkError with the message «Library not found tibrvnative or android» and successfully load the native library in your Java application.

That’s all about this Java troubleshooting tips to fix java.lang.UnsatisfiedLinkError: Library not found. As you have learned in this article the java.lang.UnsatisfiedLinkError with the message «Library not found tibrvnative or android» is typically encountered when a Java application is unable to locate and load a native library using JNI.

It can be resolved by ensuring that the native library is available on the system, compatible with the Java runtime and operating system, and correctly loaded in the Java code. Additionally, checking library dependencies, classpath, system environment variables, and keeping the library up-to-date can also help in resolving this error.

Properly configuring the library path, loading the library correctly in Java code, and verifying the library’s compatibility and dependencies are crucial steps in resolving this error and ensuring the smooth execution of your Java application.

If you have already faced this issue and your solution differ than mine then you can also share with us by commenting.

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