I just ran my practice servlet, which calls two separate classes
DBConnector and RecordObj, and received this nullPointer exception.
java.lang.NullPointerException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at DBConnector.(DBConnector.java:39)
at DBConnector.getInstance(DBConnector.java:58)
at JohnServlet.doPost(JohnServlet.java:15)
at javax.servlet.http.HttpServlet.service
(HttpServlet.java:747)
at javax.servlet.http.HttpServlet.service
(HttpServlet.java:840)
at com.sun.web.core.ServletWrapper.handleRequest
(ServletWrapper.java:155)
at com.sun.web.core.InvokerServlet.service
(InvokerServlet.java:168)
at javax.servlet.http.HttpServlet.service
(HttpServlet.java:840)
at com.sun.web.core.ServletWrapper.handleRequest
(ServletWrapper.java:155)
at com.sun.web.core.Context.handleRequest(Context.java:414)
at com.sun.web.server.ConnectionHandler.run
(ConnectionHandler.java:139)
DBConnector is using a properties file to access the driver and the
url strings for making the db connection. The nullpointer comes at:
username = props.getProperty("username");
password = props.getProperty("password");
url = props.getProperty("url");
driver = props.getProperty("driver");
try
{
Class.forName(driver);
connection = DriverManager.getConnection
(url, username, password);
}
Is there something about servlets that interferes with accessing a
properties file, or is my problem more fundamental?
I know I probably should set the db settings in the configuration xml
file, but I am trying to incremental about learning to use servlets
and jsp's.
I am reusing the db code, so I believe it should have no problems
loading the properties.
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