I am trying to use postgres on a EJB in a EAR, but i keep getting the error:
java.lang.ClassNotFoundException: org.postgresql.driver
so my app is not finding the jar. According to what I saw here: How to use 3rd party libraries in glassfish?, I should put the jar on either glassfish3/glassfish/domains/domain1/lib/ext or glassfishv3/glassfish/domains/domain1/lib, I tried both and is not working.
I was also not sure of something, should I add the jar to that folder and then reference the build path (using netbeans) of my app to the jar on that folder? or should I omit this step?
Anyhow, I tried both, referencing it and not doing it (only adding the jar to the folder in glassfish) and is not working.
So, how can I add an external jar to my application (EAR) that is put on a glassfish cluster?
Related
I've added mysql connector jar file, but class not found exception still arises.
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Your error clearly says that the MySql connector jar is not placed in the correct folder. The correct folder is WEB-INF/lib. So place your jar in this folder.
You have your eclipse project referencing the mysql library. This allows the compiler, in eclipse, to find the classes when compiling. However, you do not have the library as part of your web app when you publish it to your tomcat server. You need to remove the library from the project, and copy the jar file into your app's WEB-INF/lib directory.
java.lang.classnotfoundexception com.mysql.jdbc.MySql issued by WebAppClassLoader. This tells that you need to include MySql connector jar in your web path under WEB-INF/lib directory.
BackGround:
I am using Eclipse Lunar along with the Google App Engine plugin to try and build a website. Everything was going well until I wanted to save some data so I followed the tutorial on using Objectify. I downloaded the Objectify jar and placed it in "/war/WEB-INF/lib/" and then added it to the classpath. I then made a ObyHelper.java class as instructed in the tutorial and made a couple of my own test classes (which for now you can assume to contain no errors). I can successfully deploy too.
The question
When attempting to load the jsp page that uses Objectify (or any servlet/jsp url for that matter) I get the following error:
Uncaught exception from servlet
java.lang.NoClassDefFoundError: Could not initialize class com.googlecode.objectify.ObjectifyService
What did I do wrong and how should I have added the Objectify jar to the class path?
In order to get the jars to work in the GAE plugin for eclipse project structure you need to
1) place the jar on the WEB-INF/lib folder (in order for them to be deployed to the cloud)
2) add those jars to the classpath manually in order for eclipse to recognize them on you local dev environment.
Have you read the Setup documentation?
https://github.com/objectify/objectify/wiki/Setup
You need the guava jar as well. But really you should use Maven (or Ivy, or Gradle); manually copying jars is very old skool.
I'm trying to deploy WAR file into JBoss 7.
I placed the WAR file in the standalone/deployments folder.
while starting the server I’m getting ClassNotFoundError.
I believe Since the jars are not part of the WAR file and not placed in the WEB_INF/lib folder so I need to add them externally.
I read so many tutorials but I just can’t understand how it works.
So my question is how I simply add JAR files to the JBoss classpath.
If you want to add any jars that are not part of WebApp but are still needed to be loaded, one approach would trying to copy the jars at following location:
$JAVA_HOME/jre/lib/ext.
The JBOSS server should point to this java installation and this might resolve your issue.
This might be one way.
JBOSS 7 uses module based loading, hence most of the jars will be loaded if module is included in standalone.xml.
You will need to check in JBoss Release notes if third party modules can be loaded.
Ok I solved it by creating new module and by adding the module dependency in the MANIFEST of my jar.
I'm developing a web application in JBoss in Eclipse Luna using external jars. I have imported the jars clicking on Project => Properties => Build Path => Add External Jars. Because the web application will need to use those jars, i have placed them in the MyApp.war/WEB-INF/lib folder, so, when the webapp will be finished, i'm sure i can just export the .war folder and deploy it on another server.
1) The problem is that everytime i turn on my pc in the morning, the deployment process gives me a ClassNotFoundException. I see that the external jars are no longer in their place. As far as i know, i'm not using any plugin to manage dependencies (i'm a newbie on webapps)
EDIT:
2) what i do is unpack my zip containing the jars again in the lib folder. Strangely, if i unpack them in a subfolder (for example, i place the jars in lib/httpcomponents/lib) JBoss cannot find the jars. What's the reason?
Try to inserting the external jar files in to jboss server lib directory (jboss\server\default\lib)
Summary
Classes from 3rd party jar files are accessible when added to build path while running a standalone JUnit test, but "ClassNotFoundException" when accessed through plain old java objects from within a dynamic web project.
IDE used: Eclipse
Web Server: Apache 7
Details
My project required a lot of 3rd party jars, namely sqlite, eclipse jdt & jsoup. I had created this project as a standalone project and all the classes from the jars were accessible fine.
But now I have copied the entire "src" folder into a "dynamic web project". I have created a folder "jars" which contains all these 3rd party jars and ensure that all of these are added to the build path by following these steps:
Project properties --> Java Build Path --> Libraries --> Add jars --> Select all the jar files from jars folder.
These jars are accessible fine when I run a standalone JUnit test inside the web project. Note that this junit test does not require a server by any means.
But when I try to "Run on Server.." , I keep on getting ClassNotFoundException like these for all the 3rd party classes:
java.lang.ClassNotFoundException: org.sqlite.JDBC
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1672)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1517)
I'm sure this has got to do something with my lack of knowledge of how applications are deployed on the web.
The runtime classpath can be different from the build classpath. Create an explicit launch configuration. The default will start with the build classpath but you may have to manually tweak it to include those 3rd party jars.
I've run into this problem before with Eclipse and the Web Server Tools project. Check your .settings files and other files for configuring the plugins that you're using with your project. You may have to remove some filters in the Eclipse view. WST constructs its build path differently, so it may not be using the jars that you've included in your project.
I figured it out. I just had to put all the jars in the WEB-INF/lib directory. I assumed that Eclipse would do all the required settings for me when I asked it to use the mentioned jars. But I guess there are somethings that are not automated very well.