Develop Reference

GlassFish HTTP Status 500 - Internal Server Error(JSTL)

When I try to run my Web Application using JSP, the GlassFish server returns the follow message:
HTTP Status 500 - Internal Server Error
type Exception report
messageInternal Server Error
descriptionThe server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource"
root cause
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Class name is wrong or classpath is not set for : com.mysql.jdbc.jdbc2.optional.MysqlDataSource"
note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 5.1.0 logs.
GlassFish Server Open Source Edition 5.1.0
And I don't knhow what to do. I think the error is connected to Can't find javax.servlet.jsp.jstl.jar library in glassfish server

You will need to make the MySQL JDBC jar file available to Glassfish.
https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-usagenotes-glassfish-config.html

So I have figured it out, all I had to do was to set the datasource class name to
com.mysql.cj.jdbc.MysqlDataSource
since I was using MySql connetor J version 8.
Initally I had set the datasource class name to
com.mysql.jdbc.jdbc2.optional.MySqlDataSource

New Relic Java Agent error 401

I am using NewRelic on a AWS Linux machine and a Java Application on TomCat. The logs of NewRelic are fine, and my application appears on NewRelics's website. The problem is my data is not being sent. I always see the error "An error occurred posting metric data - Received a 401 response from collector-182.newrelic.com. This data will be resent later." on the log file.
Does anybody know how to solve this? My license key is right.

FileNet 4.0 P8 Jboss 4 - Cannot login - Credentials Exception

I am using Filent 4.0 and Jboss 4, it was working well but recently I got the Credentials Exception error message when trying to login to Workplace.
Error Message:
Credentials Exception
Exception Class:
com.filenet.wcm.toolkit.util.WcmException
Stack Trace:
Credentials Exception
at com.filenet.wcm.toolkit.server.base.WcmSignInPolicy.encodeTokenException (WcmSignInPolicy.java:345)
at com.filenet.wcm.toolkit.server.base.WcmSignInPolicy.getSignInURL (WcmSignInPolicy.java:332)
at com.filenet.wcm.toolkit.server.base.WcmSignInPolicy.doSignIn (WcmSignInPolicy.java:301)
...
I already tried to stop/start JBoss Server, Application Engine server (P8) and purge the cache as following
http://www-01.ibm.com/support/docview.wss?uid=swg21967918
http://www.ibm.com/support/knowledgecenter/SSNW2F_4.5.1/com.ibm.p8.install.doc/p8pup363.htm
But it does not work. I am out of solutions, any ideas ? Anyone does know FileNet ?

We reboot the server, and finally the error did not show anymore, maybe all services were not reinitialized at the last restart.

java.lang.ExceptionInInitializerError on JSP page

HTTP Status 500 - Internal Server Error
type Exception report
messageInternal Server Error
descriptionThe server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.ExceptionInInitializerError
note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.0 logs.
GlassFish Server Open Source Edition 4.0
Got When I Run my JSP project on Netbeans 7.3
How to solve this ?

this is because there is a number to long in the code, maybe go back and check if you added a number to long and you just need to change it, check all of the integers!

Unable to get connection, DataSource invalid - Netbeans, MySQL

I'm following the tutorial of Netbeans site:
https://netbeans.org/kb/docs/web/mysql-webapp.html
everything was working fine until this step: Implementing JSTL code STEP 4 where the list should be displayed I get the following error:
javax.servlet.ServletException: javax.servlet.jsp.JspException:
Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException : Error connecting to server localhost on port 1527 with message Connection refused."
root cause
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException :
Error connecting to server localhost on port 1527 with message Connection refused."
note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.0 logs.
I suppose netbeans still tries to connect to the Derby DB. How can i change it to MySQL DB?
I am using Java EE7, MySQL, Netbeans, Glassfish 4

The stack trace indicates that the MySQL DB is not running on port 1527
See https://netbeans.org/kb/docs/ide/mysql.html

Use GlassFish Server Open Source Edition 3.x and Java EE Version 5 or 6
Then it works.

I had a similar problem and I solved it using a different approach. I changed the settings in the glassfish-web.xml file found in IFPWAFCAD/WebPages/WEB-INF folder. The following settings worked for me for this particular tutorial https://netbeans.org/kb/docs/web/mysql-webapp.html:
Resource Reference name: jdbc/IFPWAFCAD
JNDI Name: jdbc/IFPWAFCAD
Principal Name: root
Principal Password: nbuser
These settings will work for this particular tutorial - I used glassfish 4 - and Java EE 5. No need to install glassfish 3