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Derby java.sql.SQLException: No suitable driver found for URL

 
oz erudio
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My code is below:




I use the three conventions but it gives the same exception I enclosed below.. WHYY?



java.sql.SQLException: No suitable driver found for URL
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at org.example.ch3.iteration2.Database.lookupFullname(Database.java:32)
at org.example.ch3.iteration2.HelloServlet.doGet(HelloServlet.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
 
Rob Spoor
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Did you perhaps forget to load that class?
 
oz erudio
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No, I forgot to disconnect from the database before running the application. Derby does not allow to be shared by multiple processes..
 
Rob Spoor
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The error message would seem to indicate differently. Right now the driver appears to just say that it's not valid at all for the connection String, so DriverManager skips it completely. If I'd have written that driver I would have chosen a different error message and throw an SQLException from the driver itself.
 
It is sorta covered in the JavaRanch Style Guide.
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