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java.lang.NullPointerException: 	at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507)	at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476)	at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307)	at java.sql.DriverManager.getDriver(DriverManager.java:253)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143)	at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)	at com.inz.servlet.StartServlet.doGet(StartServlet.java:61)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)	at java.lang.Thread.run(Thread.java:619)