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Hibernate works in Java Main Class but does not works if conneted to JSF form via Managedbean [duplicate]

How should I add JAR libraries to a WAR project in Eclipse without facing java.lang.ClassNotFoundException or java.lang.NoClassDefFoundError?
The CLASSPATH environment variable does not seem to work. In some cases we add JAR files to the Build Path property of Eclipse project to make the code compile. We sometimes need to put JAR files inside /WEB-INF/lib folder of the Java EE web application to make the code to run on classes inside that JAR.
I do not exactly understand why CLASSPATH does not work and in which cases we should add JARs to Build Path and when exactly those JARs should be placed in /WEB-INF/lib.

The CLASSPATH environment variable is only used by the java.exe command and even then only when the command is invoked without any of the -cp, -classpath, -jar arguments. The CLASSPATH environment variable is ignored by IDEs like Eclipse, Netbeans and IDEA. See also java.lang.ClassNotFoundException in spite of using CLASSPATH environment variable.
The Build Path is only for libraries which are required to get the project's code to compile. Manually placing JAR in /WEB-INF/lib, or setting the Deployment Assembly, or letting an external build system like Maven place the <dependency> as JAR in /WEB-INF/lib of produced WAR during the build, is only for libraries which are required to get the code to deploy and run on the target environment too. Do note that you're not supposed to create subfolders in /WEB-INF/lib. The JARs have to be placed in the root.
Some libraries are already provided by the target JEE server or servletcontainer, such as JSP, Servlet, EL, etc. So you do not need put JARs of those libraries in /WEB-INF/lib. Moreover, it would only cause classloading trouble. It's sufficient to (indirectly) specify them in Build Path only. In Eclipse, you normally do that by setting the Targeted Runtime accordingly. It will automatically end up in Build Path. You do not need to manually add them to Build Path. See also How do I import the javax.servlet / jakarta.servlet API in my Eclipse project?
Other libraries, usually 3rd party ones like Apache Commons, JDBC drivers and JEE libraries which are not provided by the target servletcontainer (e.g. Tomcat doesn't support many JEE libraries out the box such as JSF, JSTL, CDI, JPA, EJB, etc), need to end up in /WEB-INF/lib. You can just copy and paste the physical JAR files in there. You do not necessarily need to specify it in Build Path. Only perhaps when you already have it as User Library, but you should then use Deployment assembly setting for this instead. See also ClassNotFoundException when using User Libraries in Eclipse build path.
In case you're using Maven, then you need to make absolutely sure that you mark libraries as <scope>provided</scope> if those are already provided by the target runtime, such as JEE, Servlet, EL, etc in case you deploy to WildFly, TomEE, etc. This way they won't end up in /WEB-INF/lib of produced WAR (and potentially cause conflicts with server-bundled libraries), but they will end up in Eclipse's Build Path (and get the project's code to compile). See also How to properly install and configure JSF libraries via Maven?

Those JARs in the build path are referenced for the build (compile) process only. If you export your Web Application they are not included in the final WAR (give it a try).
If you need the JARs at runtime you must place them in WEB-INF/lib or the server classpath. Placing your JARs in the server classpath does only make sense if several WARs share a common code base and have the need to access shared objects (e.g. a Singleton).

If you are using Maven:
Open the project properties, and under Deployment Assembly click Add...
Then select Java Build Path Entries and select Maven Dependencies

Resolved by setting permissions.
Had related issue using PySpark and Oracle jdbc. The error does not state that the file cannot be accessed, just that the class cannot be loaded.
So if anyone still struggles, check the permissions. Some might find it obvious tho'.

I want to give the answer for the folowing link question ClassNotFoundException oracle.jdbc.driver.OracleDriver only in servlet, using Eclipse
Ans: In Myeclipse go to Server-->left click on Myeclipse Tomcat7-->Configure Server Connector-->(Expand)Myeclipse Tomcat7--> Paths-->Prepend to classpath-->Add jar (add oracle14 jar)-->ok

Class not found Exception after exporting Exsisting class to JAR

I have created a web application in java and is working fine. But i want to Convert few classes in JAR format, so that the code inside the jar is not visible to others.
I have totally 5 classes. 3 classes (CreateFile,ProcessFile,HouseWork) belong to a package "FilePackage" remaining two classes are SFTPEngine and ExecEngine they belong to Package "PuttyEngine".
I selected all these classes and gave export as JAR and named it mytool.jar.
Now i deleted all these classes from eclipse and added the jar. In the Eclipse IDE after configuring the BuildPath no error was displayed. when I run the application on tomcat server from the IDE itself I get ClassNotFoundException
How Do I export those classes into a JAR file and use them. These classes use functions from other classes as well. ie SFTPEngine class will access fucntions from others classes and other classes also wil be accesing the functions in SFTPEngine class.
I am not using any build tool. Cause I cannot use them in my office , I need to get permission from admin, so is there any way to do this work without build tools like ANT or MAVEN

In Eclipse, click on your web project / Properties / Tab "Deployment Assembly".
Add your JAR here.
After that, in the server Tab, when you expand the server, then you can expand the web project, and you should see your JAR.

Make sure you include your jar under webapps/ under Tomcat installation directory if you're running Tomcat outside Eclipse.

How to organize gae projects in eclipse

I try to find the way to organize a GAE with several projects within Eclipse using the Google plugin for GAE:
The Web App project (a WebApp project) containing the GAE web application.
A Java project with data access
A Java project with utility classes
My problem here is how to link things together. I want to add the two Java projects in both build and execution paths. Since a Web App project follows the JavaEE structure, only what is specified in the WEB-INF/lib directory is taken into account.
I would like to find out how to simulate a Jar file in this directory based on a Java project present in the Eclipse workspace based on what the Google Eclipse plugin for GAE provides.
I saw something that seems to be related in the WebApp project properties Google > Web Application, section "Suppress warnings about these build path entries being outside of WEB-INF/lib".

For the GAE web application to run then you'll need the classes or a jar from the projects you want to include in the WEB-INF/classes or WEB-INF/lib folders respectively.
One way would be to build your data and utility projects and put the resulting jars in the WEB-INF/lib folder. You can then then reference those jars as libraries from your web app and all should be fine. Of course that's a bit tiresome to do manually, so you should probably check out some dependency management tools. From personal experience Ivy and IvyDE were easy to get into and should cover your needs although Maven and others have their strengths.
Another way that is a easier (but less structured) is to used linked source folders in your build path (to the source folders for your data and utility projects). In such way Eclipse will build those sub projects to WEB-INF/classes and build and execution should work similarly.

Fine-tuning source exports from a utility module to a web project

I'm using IBM Integration Designer 7.5, which is a version of Eclipse 3.6 with some added features. I'm building a dynamic web project targeting Tomcat. The web project has a dependency on another project, a utility module.
I've configured the web project to include code from the utility module per this question and it works well. A WAR built from the web project includes a jar containing the class files from the utility module.
The problem is that the utility module includes some junit testcase classes, and they're being included in the jar that goes into the WAR. I'm looking for a way to leave out the junit classes.
In the utility module, the "real" code is in a folder called "src" and the test cases are in a second source folder called "test". I've gone to the Build path->Order and Export tab of the utility project, and it lists both "src" and "test" as exports. It's not possible to uncheck the box for the "test" entry. The eclipse documentation says that source folder are always exported from a project.
Is there a realistic way to fine-tune this setup so that the test cases aren't packaged into the web project?

Do you have the source for the utility modue? What are you using as a build tool? If the answer to the first question is yes and the answer to the second question is not Maven, then use Maven. By default it excludes anything in the src/test directory from the build artifact. You will need to either rearrange your project directories to be the Maven default, or do some configuration of your POM file so that Maven knows which is the test directory.

How to include third party libraries in Utilty Project?

In Eclipse Java EE perspective, how does one add a thridparty Jar to a Utility Project?
To elaborate: In a "normal" Java (Not Java EE) project, there's Referenced Libraries where you can put jars. In a Dynamic Web Project, there's Web App Libraries. In a Utility Project, there's only EAR Libraries, which don't appear relevant (well, there are Referenced Libraries that show up in the Package Explorer in Java perspective, but not in the Project Explorer in the Java EE perspective). I went ahead and added a /lib directory under my Utility Project root, and put a jar there (I forgot if I did that in the Java Package perspective, or just in the file system). I added it to Java Build Path, and everything compiles, including the Dynamic Web projects that reference the Utility Project. But when I deploy to Tomcat, I get ClassNotFoundException for the classes in the thirdparty jar.
How do I add the thirdparty jar to the Utility Project in a way that will make it get deployed as part of the web application?

I answered something similar before.
Eclipse and How it Handles JARS -- Odd Case
In essence, there's a difference between build-time and run-time JAR dependencies. For inclusion in EAR / WAR files, you have to use the "Deployment Assembly" panels.

I am not sure to understand exactly your question, but you can simply right-click on your project, in Properties you select Java Build path > Libraries, and then add your JAR in the list of third parties libraries. This will add your jar in the classpath project.
Another way is to use the (ugly) solution of creating a lib directory, put all your third parties libraries in it, and add this directory in the classpath of your project (like for the previous solution, as you can add a whole directory in Eclipse project).
The last solution is to give the responsibility of the dependencies management to a real build system, such as Maven, Ant+Ivy, Gradle...