I have a jruby rails app that has some jar dependencies in rails lib/java. I prefer this to just putting them straight in lib as it separates my java libs from ruby libs. Works locally using jruby. Problem is, on deploy, tomcat is looking for a bunch of these jars (such as jruby) in WEB-INF/lib, not WEB-INF/lib/java.
I think i need to put some config in the web.xml that tells tomcat to also look in lib/java, but i can't find ANY docs on the matter.
I don't want to modify tomcat's system wide classpath, I just want to tell its class loader to check a directory other than WEB-INF/lib for this particular app only
Can anyone enlighten me on how to do this?
you can't change this directory, j2ee spec says that all libs go in WEB-INF/lib. That is where they are supposed to go.
Just stay with your two directories in your project folder, but join them, when creating your .war file. This should be pretty easy with apache ant and other build tools.
Related
Hai i am developing a web application my project need to refer lib(jar) file from server, So I do not want to keep my jar file in project i need to refer the path of the jar files available in server by this i can reduce my .war file size. How can i make this reference in Jboss Server.
the first step you have to add your lib in jboss server like a module, have a look at :
http://www.mastertheboss.com/jboss-server/jboss-as-7/how-to-install-a-module-on-jboss-as-7
Next if you use Maven for dependencies, add provided to your lib dependency, in that way while packaging the .war maven will keep the jar in your lib and it will be provided by the server.
this can also be helpful : https://access.redhat.com/documentation/en-US/JBoss_Enterprise_Application_Platform/6/html/Development_Guide/Add_an_Explicit_Module_Dependency_to_a_Deployment1.html
Have a look at the class loading documentation. That should give you the information you need.
I have an Eclipse project running on Tomcat, with my dependency jars sitting in the WEB-INF/lib directory. Everything is great. But the war file created on export is huge, and I'm going to need to send it back and forth to the test server, which will be time consuming. It seems like a waste.
So I put all my dependency jars in a folder, dependency_jars, in my file system, and configured the build to point there. The build works, but when I run it (still on my local machine) the app is throwing runtime errors.
Reading around, I went to the project properties and added the jars to the Web Deployment Assembly. Now the runtime works, but the exported war once again has all the jars packaged with it.
So how do I have my dependencies available for the runtime environment, without having Eclipse package them inside the war?
OK I'm not sure this is the most elegant solution but what I did is configure Tomcat to use an external library, put the dependency jars there, and then let eclipse create the war with everything in it, explode it from the command line, remove the dependency jars, repackage the war, and finally send it out.
Well, definitely not an elegant solution. But it works. Here are the steps:
Configure Tomcat to use an external resources library. Go to tomcat_home/conf/catalina.properties and add your directory under the comment that starts with "List of comma-separated paths defining the contents of the "common" classloader..."
Export war through Eclipse.
Explode the war (pun probably merited here:) jar -xvf MyWar.war
Remove your dependency jars (which are now in the external directory from step 1 above.)
Repackage the war: jar cvf MyWar.war WEB-INF
I'm using Eclipse 3.7 (STS) with Tomcat 7 running inside the IDE. I've created a new Dynamic Web project and added a single JSP file to the web content root folder. I can run Tomcat and access the JSP from within Eclipse with no problems.
I've added a few 3rd party JAR's to the project from User Libraries (I'm not using maven or auto dependecies managment). In the JSP I reference a class from the project's JAR file, I can compile this with no problem, but when I deploy on Tomcat the JSP throws ClassNotFoundException. Clearly, Tomcat can't find the JAR's from my library settings. I tried creating a Run As configuration for Tomcat Server and I set the classpath to match the classpath settings of the project, but I still get the same classnotfound problem.
I could get around the issue by manually copying all project JARs to the WEB-INF/lib directory so the webapp can find all dependencies, but that's absurd and I don't expect that to be the solution since it's a maintenance nightmare.
Am I missing something?
In project's properties, go to Deployment Assembly. Add there the buildpath entries as well which you've manually added as user libraries. It'll end up in /WEB-INF/lib of the deployed WAR.
You'll need to copy the jar files to the WEB-INF/lib folder: that is where they are supposed to be.
Eclipse should offer you the option of generating a WAR file that includes all the dependencies: I haven't used Web Tools for a good while but one way or another all dependencies have to be in WEB-INF/lib or the class loader won't be able to find them.
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
I have this third party framework which comes with a huge set of dependent libraries, which by the way, have not yet been indexed in any Maven repository. I want to use this framework with some Web Apps, but for obvious reasons I don't want to put all those libraries under WEB-INF/lib, neither do I want just to place them all under server/default/lib to avoid mixing them with other local and third party libraries.
Is there some way under JBoss 4.2.2 or higher to specify a custom lib directory for certain Web Apps? It's possible and/or advisable to have something like server/default/lib/myAppLib?
Any suggestion on this regard?
You can add the following entry in your server/default/conf/jboss-service.xml for putting your jars in server/default/myLibDir:
<classpath codebase="myLibDir" archives="*"/>
To my knowledge, you have three options:
Package you WARs in an EAR and move the library JARs out of WEB-INF/lib and
place them in a lib folder at the root of the EAR. No extra configuration required. This (non portable) solution is described in Configuring JBoss shared libs.
Move the library JARs out of WEB-INF/lib and place them into server/xxx/lib.
Deploy the JARs in the deploy/ folder and disable WAR file class loader isolation.
I don't recommend option #3. Option #2 is what you don't want. This leaves us with option #1 (which is IMO the cleanest).
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