Question

I have created a java SE application that uses the mysql database using mysql java connector.I have hosted the apache and mysql server on ubuntu.

I have my .jar file on the apache server and also the jnlp,

When I simply download the jar file and run it, it seems to work, but, when I am trying to use it through jnlp the first view comes up then when I enter my username and password and click the login button it just stops there

Here is my JNLP file

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://servername:80/" href="" >
    <information>
        <title>MyProject</title>
        <vendor>abd</vendor>
        <icon href="icon_1.jpg"/>
        <offline-allowed/>
    </information>
    <resources>
        <j2se version="1.7+" href=
           "http://java.sun.com/products/autodl/j2se"/>
        <jar href="MyJar.jar" />
    </resources>
    <application-desc
         main-class="" >
    </application-desc>
</jnlp>

Please let me know what it the error.
On the server I have 80 8080 and 3306 ports as public ports.

as I said I can update the database using the jarfile that I downloaded from the server but when I try to run the file through JNLP I freezes.

I saw the exception in java console it says

Exception in thread “AWT-EventQueue-0” java.lang.ExceptionInInitializerError
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:286)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at MyProject.database.connect(database.java:27)

Caused by: java.security.AccessControlException: access denied (“java.util.PropertyPermission” “file.encoding” “read”)
at java.security.AccessControlContext.checkPermission(Unknown Source)

I cant figure out what the problem is? do I need some port open for JNLP or anything.

Any help appreciated.

Thanks

Answer 1

Three things that come to mind:

1. You need to sign the jar for javawebstart to allow access to sockets.
2. You are obviously trying to connect to a mysql DB, it is unclear from your description where this db is and if connection to the host is allowed.
3. did you bundle the mydql driver in your jar ? or is it referenced somehow ?