I get following error using hibernate:
Exception in thread "main" javax.ejb.EJBException: org.hibernate.exception.JDBCConnectionException: Cannot open connection
...
...
Caused by: java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/db
The problem is similar to: other question but I think my url is right!
Solution
i found the solution searching here on stackoferflow :)
I needed to place my mysql-connector jar file into jboss/server/default/lib.
Although I dont understand it since i added this jar file as a dependency and it was placed in the lib folder on deployment.
Related
I have installed Hive and mysql successfully, i did the configuration for Hive as suggested in link. But i see an error as below:
Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
..
..
Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "BONECP" plugin to create a ConnectionPool gave an error : The specified datastore driver ("com.mysql.jdbc.Driver") was not found in the CLASSPATH. Please check your CLASSPATH specification, and the name of the driver.
so i added the mysql-connector-java.jar in lib of Hive. Now hive just hangs, i dont get the shell at all.
Kindly suggest how i can resolve it
You need to add mysql connector to the classpath in the hive. It is looking for that connector in your classpath and its not able to find it. Download mysql connector and put it to the following path
/usr/lib/hive/apache-hive-0.13.0-bin/lib
I'm developing a web application in java where I'm trying to connect to a MySQL database using JDBC template ( with springs dao) but I always get:
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/DealingOfInsiders] threw exception [Request processing failed;
nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver '] with root cause
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
[....]
I think the problem is coming from the file mysql-connector-java-5.1.25-bin.jar which contains the targeted class ...
So I tried many things to get this problem solve :
I've configured the build path of my project whith this jar but it didn't worked
I ve also put the file in the folder : WEB-INF/lib , didn't worked
I ve configured a classpath variable to this jar in eclipse ( preference ->java->buildpath->classpath variabe ) it didn't worked
I have put the jar file in the tomcat library but it didn't work as well
'com.mysql.jdbc.Driver '
^^ // remove this space
There appears to be a trailing space on the name?
'com.mysql.jdbc.Driver '
Apart from that, "com.mysql.jdbc.Driver" is correct.
The WEB-INF/lib folder is a good place for project-specific drivers & libraries; keeping the Tomcat shared folders up-to-date is not so easy.
Back in JDBC days you had to load the class with Class.forName( clazzName) to register it before you asked JDBC for a connection, but that's not the issue here.
I had this issue but with the Postgres driver and I'm using Eclipse. If you're using Tomcat 7, try adding the JAR file to the lib folder in your Tomcat directory. That worked for me. I didn't have to use Class.forName() or put the JAR in my classpath. I hope this helps you.
I get the following error message when trying to connect a web app running on EAP6 to MySQL in OpenShift.
javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Communications link failure
How do I fix this?
The same issue was discussed at https://community.jboss.org/thread/202318.
The solution is to append "?autoReconnect=true" to the connection URL. You do this in the standalone.xml file, found in the .openshift/config folder in your OpenShift Maven project.
EDIT
This is actually a known bug: https://community.jboss.org/thread/177144. Validating the connection can be used as a workaround.
<validation>
<check-valid-connection-sql>SELECT 1</check-valid-connection-sql>
</validation>
I'm swapping out a derby database for a MySQL one. I had everything working before but after what I thought was the proper configuration I'm getting the error:
Caused by: javax.resource.ResourceException: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource
Full error output from console:
Caused by: javax.resource.ResourceException: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource
at com.sun.gjc.common.DataSourceObjectBuilder.getDataSourceObject(DataSourceObjectBuilder.java:292)
at com.sun.gjc.common.DataSourceObjectBuilder.constructDataSourceObject(DataSourceObjectBuilder.java:114)
at com.sun.gjc.spi.ManagedConnectionFactory.getDataSource(ManagedConnectionFactory.java:1292)
at com.sun.gjc.spi.DSManagedConnectionFactory.getDataSource(DSManagedConnectionFactory.java:148)
at com.sun.gjc.spi.DSManagedConnectionFactory.createManagedConnection(DSManagedConnectionFactory.java:101)
at com.sun.enterprise.resource.allocator.LocalTxConnectorAllocator.createResource(LocalTxConnectorAllocator.java:87)
I've double checked some of the names, the connection pool and other resources.I've also added the MySQL driver .jars to the library of glassfish in both projects. The database was definitely working correctly through eclipse because I was able to view tables and display the resources inside the database context of eclipse. So I know that at least THOSE drivers are working correcly. Also the persistence.xml file looks good. it references the jdbc/mydatabase jndi reference like it should and default JTA is selected as the manament type.
Does anyone have another suggestion? Thank you
I've also added the MySQL driver .jars to the library of glassfish in both projects.
It was apparently not done right. The JAR has to go in /glassfish/domains/[domainname]/lib/ext folder of the Glassfish installation where [domainname] usually defaults to domain1. You can and should not configure it from the Eclipse side on.
Looks like I am replying very late, but however people who would be referring to this thread may find the following information being useful. So I am posting it here:
Download the connector Jar from http://dev.mysql.com/downloads/connector/j/5.0.html
unzip the pack and copy mysql-connector-java-verno-bin.jar
past the same at [GlassFish Installation Directory]/domains/[domain name]/lib folder
restart your domain and ping to check your connection in JDBC Connection Pools
There you go. If your MySql is running then it will ping the DB successfully
I copied the jar file to $glassfish_install_folder\glassfish\lib, after that it worked. I use glassfish 4.0.
Check this link from oracle.
I encountered this issue in 2018 and would like to note that if you are using glassfish 4 (current is 5) then it seems you have to use the Connector/J 5.1.47 version for it to work. If you use the current version (Connector/J 8.0.13) then exception mentioned in the original question keeps appearing, no matter where you place the .jar file.
With Connector/J 5.1.47 it works perfectly.
Solution is
> asadmin add-library /path/to/mysql-connector-java-bin.jar
Check this link:
https://blog.payara.fish/using-mysql-with-payara
I encountered this issue in 2019 and would like to note that if you are using docker image payara/server-full (I am using 5.194 so far) as I do the location to place the driver jar is:
/opt/payara/appserver/glassfish/domains/production/lib/
In the end I am doing something like this in the Dockerfile of payara server:
RUN wget http://central.maven.org/maven2/org/mariadb/jdbc/mariadb-java-client/2.2.0/mariadb-java-client-2.2.0.jar \
-O /opt/payara/appserver/glassfish/domains/production/lib/mariadb-java-client-2.2.0.jar
I have a groovy application running locally on my desktop.
Apparently it runs error free. At least all unit tests I wrote are fulfilled.
I want to deploy the application using a war file. For this I use the command
grails war
in the home directory of the application. When doing this I am getting the following exception:
Error executing script War: java.lang.NullPointerException
gant.TargetExecutionException: java.lang.NullPointerException
at gant.Gant$_dispatch_closure4.doCall(Gant.groovy:331)
at gant.Gant$_dispatch_closure6.doCall(Gant.groovy:334)
at gant.Gant$_dispatch_closure6.doCall(Gant.groovy)
at gant.Gant.withBuildListeners(Gant.groovy:344)
at gant.Gant.this$2$withBuildListeners(Gant.groovy)
at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
at gant.Gant.dispatch(Gant.groovy:334)
at gant.Gant.this$2$dispatch(Gant.groovy)
at gant.Gant.invokeMethod(Gant.groovy)
at gant.Gant.processTargets(Gant.groovy:495)
at gant.Gant.processTargets(Gant.groovy:480)
Caused by: java.lang.NullPointerException
at _GrailsWar_groovy$_run_closure5_closure25_closure26_closure28.doCall(_GrailsWar_groovy:289)
at _GrailsWar_groovy$_run_closure5_closure25_closure26_closure28.doCall(_GrailsWar_groovy)
at _GrailsWar_groovy$_run_closure5_closure25_closure26.doCall(_GrailsWar_groovy:282)
at _GrailsWar_groovy$_run_closure5_closure25_closure26.doCall(_GrailsWar_groovy)
at _GrailsWar_groovy$_run_closure5_closure25.doCall(_GrailsWar_groovy:258)
at _GrailsWar_groovy$_run_closure5.doCall(_GrailsWar_groovy:256)
at _GrailsWar_groovy$_run_closure4.doCall(_GrailsWar_groovy:239)
at War$_run_closure1.doCall(War.groovy:38)
at gant.Gant$_dispatch_closure4.doCall(Gant.groovy:324)
... 10 more
Any hint why?
Thanks a lot in advance
I think you'll have to find the source of Gant.groovy and see what it's doing on that line. Apparently there is some problem caused by your project's specific configuration (since such a show-stopper bug would have been caught if it always occurred), but the error message does not contain much information.
Alternatively, you could try upgrading Grails to the latest version 1.1.1 if you haven't already.