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Jeff Sandler
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 Posted: Sat Jan 24, 2004 11:23 pm Post subject: applets and the classes they can access |
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I have a question about java applets and their ability to access other
classes. I am trying to write an applet that can connect to a mySQL
database.
As a temporary workaround, I created an application instead of an applet
and added the .jar file to the classpath. Even with it on the
classpath on my local machine, the statement
Class.forName("com.mysql.jdbc.Driver");
causes a java.lang.ClassNotFoundException in an applet. In order to
access the .jar file the way the applet needs to, should I
put the .jar file in the same folder as the applet?
import the .jar file?
do something else?
Here's a bonus question. What exactly is that statement
Class.forName("com.mysql.jdbc.Driver");?
Is is invocation of the method of Class called forName with the argument
in the parenthesis? If so, what does the forName method return or do?
I learned to use this statment from the readme that came with mySQL.
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Tor Iver Wilhelmsen
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| Posted: Sun Jan 25, 2004 9:59 am Post subject: Re: applets and the classes they can access |
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Jeff Sandler <ffej2ffej (AT) dslextreme (DOT) com> writes:
| Quote: | put the .jar file in the same folder as the applet?
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Won't help. You need to add it to the archives used, and the "applet"
element uses the "archives" attribute for that. If you use the plugin,
there are some related elements for "object" and "embed" - look at the
code produced by the HTMLConverter.
| Quote: | Here's a bonus question. What exactly is that statement
Class.forName("com.mysql.jdbc.Driver");?
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It loads the class. In the process of doing that, it calls the class'
static initializers, which are supposed to call
DriverManager.RegisterDriver(new com.mysql.jdbc.Driver());
The reason you do that instead of calling registerDriver yurself is
that it's more dynamic, e.g. you can do
Class.forName(System.getProperty("jdbc.driver.class"));
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