I have created a dynamic web application project in eclipse. I am able to display hello world. Now when I tried loading owl file I am getting error.
java.lang.NoClassDefFoundError: org/semanticweb/owlapi/apibinding/OWLManager
I just copied the jar to my lib folder. owlapi-api-5.1.0.jar javax-inject.jar owlapi-apibinding-5.1.4.jar. Please tell me what i am missing. Even the pom.xml file is not there in my project. I couldn't able to add maven dependencies. I don't know why? Please tell me how to add the depenency too.
I currently have my persistence.xml located in src/main/resources/META-INF/persistence.xml. Also I am using eclipselink 2.4 as my JPA 2.0 implementation.
After publishing to the server and trying to run the app in the browser I get the following error:
Exception: : java.lang.IllegalArgumentException: No persistence unit named 'X'
is available in scope Webapp. Available persistence units: [] at
This is ONLY when building in Eclipse. Leaving META-INF on the path src/main/resources/META-INF/persistence.xml and performing maven install to build the war file, the META-INF folder is correctly placed in WEB-INF/classes/META-INF/persistence.xml like it should be (inside the war). Seems that it is only and issue of when the webapp is built and ran locally in Eclipse. Can anyone explain this?
Can anyone explain what the problem is? Maybe someone has ran into this problem before?
Trying to set up a new project, and running into a weird issue. I made a new app context file named backend-context.xml, I've added spring-context as a dependency, and am trying to add namespaces through the bean config file, but it's showing as 1 error, with no explaination.
If I browse into problem explorer, it states the following error:
'Unable to load schema mappings from location [META-INF/spring.schemas]'
If I browse through the Maven Dependencies I can see this file located under the spring-beans jar.
If anyone has ideas on how to fix this, that'd be awesome!
Thanks!
Ended up being caused by a local maven jar being corrupt. Found this out by uploading the code to github and trying on a different computer which worked like a charm. So, cleaned out my local repository from all spring jars and redownloaded.
I've this problem using STS: I'm building a simple Spring app, just to try out features like MVC and persistence. Now I've created something very simple, out of a bunch of tutorials for Spring 3, that I'm using. The application fails with this, during server startup:
Code:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0': Initialization of bean failed; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean] for bean with name 'mySessionFactory' defined in ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean
but I've org.springframework.orm in web-inf/classes folder (I even tried putting it in web-inf/lib). As I copied these libs there, the came out in Web App Libraries folder. Building this project in STS works fine as this dependency is set up in build path throught project properties, but how do I transfer the libs to the web app? (I'm using Tomcat 6 as it is the server I'm going to use sometime in the future for production). Is this a config problem of my XML? Or am I just missing the right way to put this lib? (I encountered the same problem before, but adding the needed lib in classes worked it out). More than this I that if I browse inside my workspace to the folder where the working folder of tomcat should be, I can't find any work directory and any commo
Go to the Servers view and double click on Tomcat Server which will open up a Tomcat Overview page. This will show you the server path and deploy path which Eclipse is using to publish your webapps to.
For example, mine are:
Server path: .metadata\.plugins\org.eclipse.wst.server.core\tmp0
Deploy path: wtpwebapps
Now in a Command Prompt (or Explorer) browse to %ECLIPSE_HOME%\workspaces\default\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps and you should see your webapp. Go into the WEB-INF\lib directory and check if your jar is there.
A few things to try:
If the jar is not in WEB-INF\lib, you might need to republish it. Right-click on the Tomcat in the Servers view and click Publish. Does it appear? If not, Right-click on the Tomcat again and this time select Clean... which will clean out everything and republish. If this doesn't work, the brute force approach would be to delete the files manually and then tell Eclipse to republish them.
Clean your work directory, by right-clicking the webapp under Tomcat in the Servers view and selecting Clean module work directory. Or do it manually by deleting from %ECLIPSE_HOME%\workspaces\default\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\work\Catalina\localhost
You should also try closing-reopening/cleaning/rebuilding/refreshing your webapp project just in case Eclipse hasn't picked up the changes.
You need to put the various Spring JARs into your WEB-INF/lib directory (WEB-INF/classes is no use for JAR files).
You don't just need org.springframework.orm, you need most of them (see here for dependency diagram).
At least the libary jar files must be located at WEB-INF/lib within your war file. And you only need to deploy the war file to your productiv web server.
If you use STS but your Project is not a Maven project: then you need to put the files in <projectRoot>/WebContent/WEB-INF/libs .(to build the war with Eclipse/STS you need to execute Export/Web/WAR file.)
If you use Maven, then you need the specify your dependencies in the pom.xml, and use maven to package the war (run as/Maven package).
There is a VERY similar question to mine but in my case I don't have any duplicate jars in my build path, so the solution does not work for me. I've searched google for a couple of hours now, but none of the solutions I've found there actually resolve my issue. I'm creating a web site with some database connectivity for a homework. I'm using a MySQL database, developing in Eclipse and running on Windows.
I keep getting java.lang.ClassNotFoundException: com.mysql.jdbc.Driver with the following code:
import java.sql.*;
//...
public void someMethodInMyServlet(PrintWriter out)
{
Connection connection = null;
PreparedStatement query = null;
try {
out.println("Create the driver instance.<br>");
Class.forName("com.mysql.jdbc.Driver").newInstance();
out.println("Get the connection.<br>");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "secret");
query = connection.prepareStatement( "SELECT * FROM customers");
//...
} catch (Exception e)
{
out.println(e.toString()+"<br>");
}
}
//...
When I run the above code I get the following output:
Create the driver instance.
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
It doesn't get past the Class.forName... line and I can't figure out why! Here is what I did:
Download mysql-connector.
Put it in my MySQL folder C:\Program Files\MySQL\mysql-connector-java-5.1.12\mysql-connector-java-5.1.12-bin.jar.
Opened the project properties in Eclipse.
Add External Jar to my Build Path and I selected mysql-connector-java-5.1.12-bin.jar.
Every time I attempt to use the servlet I get the same error regardless if I have the jar in there or if I don't. Could you help me figure this out?
As for every "3rd-party" library in flavor of a JAR file which is to be used by the webapp, just copy/drop the physical JAR file in webapp's /WEB-INF/lib. It will then be available in webapp's default classpath. Also, Eclipse is smart enough to notice that. No need to hassle with buildpath. However, make sure to remove all unnecessary references you added before, else it might collide.
An alternative is to install it in the server itself by dropping the physical JAR file in server's own /lib folder. This is required when you're using server-provided JDBC connection pool data source which in turn needs the MySQL JDBC driver.
See also:
How to add JAR libraries to WAR project without facing java.lang.ClassNotFoundException? Classpath vs Build Path vs /WEB-INF/lib
How should I connect to JDBC database / datasource in a servlet based application?
Where do I have to place the JDBC driver for Tomcat's connection pool?
JDBC CLASSPATH Not Working
Since you are running it in servlet, you need to have the jar accessible by the servlet container. You either include the connector as part of your application war or put it as part of the servlet container's extended library and datasource management stuff, if it has one. The second part is totally depend on the container that you have.
The others are right about making the driver JAR available to your servlet container. My comment was meant to suggest that you verify from the command line whether the driver itself is intact.
Rather than an empty main(), try something like this, adapted from the included documentation:
public class LoadDriver {
public static void main(String[] args) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
}
}
On my platform, I'd do this:
$ ls mysql-connector-java-5.1.12-bin.jar
mysql-connector-java-5.1.12-bin.jar
$ javac LoadDriver.java
$ java -cp mysql-connector-java-5.1.12-bin.jar:. LoadDriver
On your platform, you need to use ; as the path separator, as discussed here and here.
Place mysql-connector-java-5.1.6-bin.jar to the \Apache Tomcat 6.0.18\lib folder. Your problem will be solved.
What you should not do do (especially when working on a shared project)
Ok, after had the same issue and after reading some answers here and other places. it seems that putting external lib into WEB-INF/lib is not that good idea as it pollute webapp/JRE libs with server-specific libraries - for more information check this answer"
Another solution that i do NOT recommend is: to copy it into tomcat/lib folder. although this may work, it will be hard to manage dependency for a shared(git for example) project.
Good solution 1
Create vendor folder. put there all your external lib. then, map this folder as dependency to your project. in eclipse you need to
add your folder to the build path
Project Properties -> Java build path
Libraries -> add external lib or any other solution to add your files/folder
add your build path to deployment Assembly (reference)
Project Properties -> Deployment Assembly
Add -> Java Build Path Entries
You should now see the list of libraries on your build path that you can specify for inclusion into your finished WAR.
Select the ones you want and hit Finish.
Good solution 2
Use maven (or any alternative) to manage project dependency
Just follow these steps:
1) Install eclipse
2) Import Apache to eclipse
3) Install mysql
4) Download mysqlconnector/J
5) Unzip the zipped file navigate through it until you get the bin file in it. Then place all files that are present in the folder containing bin to C:\Program Files\mysql\mysql server5.1/
then give the same path as the address while defining the driver in eclipse.
That's all very easy guys.
If the problem still persists,
Put the-
mysql-connector-java-5.0.8-bin jar in a place inside your Tomcat->lib->folder (No matter where you've installed your Tomcat). And change your environmental variable (Done by clicking Properties of Mycomputer -Advanced system settings- Environmental variables-And set a new variable name & variable values as the place where your lib file resides.Dont forget to enter a ; at the end of the path)
If still problem persists
Try downloading commons-collections-2.0.jar (http://www.docjar.com/jar_detail/commons-collections-2.0.jar.html) and paste the jar in the same place where your mysql jar resides (ie) inside Tomcat-lib.
Clean your project-Stop your server- Finally try to run.
Many times I have been facing this problem, I have experienced ClassNotFoundException.
if jar is not at physical location.
So make sure .jar file(mysql connector) in the physical location of WEB-INF lib folder. and
make sure restarting Tomcat by using shutdown command in cmd.
it should work.
The only solution worked for me is putting the .jar file under WEB-INF/lib . Hope this will help.
assuming your project is maven based, add it to your POM:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.26</version>
</dependency>
Save > Build > and test connection again. It works! Your actual mysql java connector version may vary.
Put mysql-connector-java-5.1.38-bin.jar to the C:\Program Files\Apache Software Foundation\Tomcat 7.0\lib folder.by doing this program with execute
My issue was a little different. Instead of jdbc:oracle:thin:#server:port/service i had it as server:port/service.
Missing was jdbc:oracle:thin:# in url attribute in GlobalNamingResources.Resource. But I overlooked tomcat exception's
java.sql.SQLException: Cannot create JDBC driver of class 'oracle.jdbc.driver.OracleDriver' for connect URL 'server:port/service'
for this error:
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
you need to:
Import java.sql.*;
Import com.mysql.jdbc.Driver;
even if its not used till app running.