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java.lang.NullPointerException: 	at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java:1743)	at oracle.jdbc.oci8.OCIEnv.getEnvHandle(OCIEnv.java:69)	at oracle.jdbc.oci8.OCIDBAccess.logon(OCIDBAccess.java:452)	at oracle.jdbc.driver.OracleConnection.(OracleConnection.java:287)	at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java:442)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:321)	at java.sql.DriverManager.getConnection(DriverManager.java:512)	at java.sql.DriverManager.getConnection(DriverManager.java:172)	at HelloWWW6.doGet(HelloWWW6.java:40)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:897)	at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:464)