postgres jdbc class problem - Mailing list pgsql-interfaces
From | Richard Morrell |
---|---|
Subject | postgres jdbc class problem |
Date | |
Msg-id | Pine.LNX.3.96.990930162012.19261B-100000@faure.ednet.co.uk Whole thread Raw |
List | pgsql-interfaces |
Hi, I'm writing a simple java applet that queries a postgres database using JDBC. The applet works fine in the appletviewer and in some copies of Netscape and MSIE. However, in most copies of Netscape and MSIE it returns a NullPointerException. The java console error messages aren't that helpful, so I looked at my web server logs. For the browsers which are failing I noticed that they are requesting extra class files which don't seem to be part of the postgres jdbc driver: [Thu Sep 30 15:28:05 1999] [error] [client 195.89.132.20] File does not exist: /home/richard/public_html/postgresql/errors_en_US.class [Thu Sep 30 15:28:05 1999] [error] [client 195.89.132.20] File does not exist: /home/richard/public_html/postgresql/errors_en.class [Thu Sep 30 15:28:05 1999] [error] [client 195.89.132.20] File does not exist: /home/richard/public_html/postgresql/errors_en_US.class [Thu Sep 30 15:28:05 1999] [error] [client 195.89.132.20] File does not exist: /home/richard/public_html/postgresql/errors_en.class [Thu Sep 30 15:28:05 1999] [error] [client 195.89.132.20] File does not exist: /home/richard/public_html/postgresql/errors.class Here is the java console message from netscape 4.6: Netscape Communications Corporation -- Java 1.1.5 Type '?' for options. Symantec Java! ByteCode Compiler Version 210.065 Copyright (C) 1996-97 Symantec Corporation # Applet exception: java.lang.NullPointerException java.lang.NullPointerException at postgresql.util.PSQLException.translate(Compiled Code) at postgresql.util.PSQLException.<init>(CompiledCode) at postgresql.Driver.connect(Compiled Code) at java.sql.DriverManager.getConnection(CompiledCode) * at java.sql.DriverManager.getConnection(Compiled Code) at OutputApplet.run(Compiled Code) at java.lang.Thread.run(CompiledCode) java.io.IOException: CreateProcess: vcafe -netscape error=0 at java.lang.Win32Process.<init>(Compiled Code) at java.lang.Runtime.exec(CompiledCode) * at java.lang.Runtime.exec(Compiled Code) at netscape.debug.Debugger.launchDebugger(Compiled Code) at netscape.debug.Debugger.uncaughtException(CompiledCode) at netscape.applet.AppletThreadGroup.uncaughtException(Compiled Code) I'm using postgres 6.5.1 with the new 6.5.1-2 JDBC driver that I downloaded from www.retep.org.uk. My code is faily straightforward: public void run() {String url = "jdbc:postgresql://faure.ednet.co.uk/software";String query = "select * from software"; try { // Class.forName("postgresql.Driver");DriverManager.registerDriver((Driver)Class.forName("postgresql.Driver").newInstance());} catch(Exceptionex) { setError("driver class: " + ex); return;} try { Vector results = new Vector(); Connection con = DriverManager.getConnection(url, "username","password"); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery(query); while (rs.next()){ String s = rs.getString("description"); int level = rs.getInt("ladder_level"); String text = level+ " " + s; results.addElement(text); } stmt.close(); con.close(); setResults(results); } catch(SQLException ex) { setError("SQLException: " + ex);} Does anyone have any ideas about what might be wrong here? -- Richard Morrell richard@ednet.co.uk Operations Manager - edNET: InternetWorkingSolutions - http://www.ednet.co.uk
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