Re: Applet Connectivity - PLEASE help

Try sending requests back with parameters to a servlet and get the servlet
to do the database work.

Hemi


----- Original Message -----
From: "Marc" <mhorv@comcast.net>
To: <pgsql-jdbc@postgresql.org>; <pgsql-novice@postgresql.org>
Sent: Tuesday, January 23, 2007 6:26 PM
Subject: [JDBC] Applet Connectivity - PLEASE help


> OK, I'll say right up front I'm a postgres novice at best.
> I've spent quite some time researching this tonight and trying out a few
> things to no avail.
> The basic question is can an applet connect to a postgres database and if
> so how (I need specific details)?
> Postgres, the database, the web server and signed applet are all on the
> same machine.
> I'm using Postgres 8.2 and Java 1.5 w/ the postgresql-8.2-504.jdbc3 jdbc
> driver.
> The software works when run through my IDE (Eclipse) but not as an applet
> in a browser.
> I've set listen_addresses = '*' in postgresql.conf and my pg_hba settings
> are:
> local      all      all                               md5
> host       all      all         127.0.0.1/32          trust.
>
> Here's the code I'm using to try to make the connection where
> strServer = :jdbc:postgresql://localhost/Arco
> strDriver = org.postgresql.Driver
> strUser = postgres
> strPswd = fred
>
>    public DBConnection(Trace trace, JApplet p_applet)
>        throws Exception
>    {
>        URL    dbIniURL;
>        URLConnection  urlConn;
>        BufferedReader in;
>        int            vals = 0;
>        String         nextVal;
>        String         strProp;
>        String         strVal;
>        String         strUser = "";
>        String         strPswd = "";
>        int            pos;
>        Properties     props = new Properties();
>
>        try
>        {
>            System.out.println("Instantiate DBConnection.");
>           dbIniURL = new URL(p_applet.getDocumentBase(), "db.ini");
>            urlConn = dbIniURL.openConnection();
>            in = new BufferedReader(new
> InputStreamReader(urlConn.getInputStream()));
>           while (vals < 4)
>            {
>                nextVal = in.readLine();
>                vals = vals + 1;
>               System.out.println("db.ini: " + nextVal.trim());
>
>                pos = nextVal.indexOf(":");
>
>                if (pos>0)
>                {
>                    strProp = nextVal.substring(0,pos);
>                    strVal = nextVal.substring(pos+1);
>
>                    if (strProp.compareToIgnoreCase("Server") == 0)
>                    {
>                        strServer = strVal;
>                    }
>                    else if (strProp.compareToIgnoreCase("Driver") == 0)
>                    {
>                        strDriver = strVal;
>                    }
>                    else if (strProp.compareToIgnoreCase("User") == 0)
>                    {
>                        strUser = strVal;
>                    }
>                    else if (strProp.compareToIgnoreCase("Password") == 0)
>                    {
>                        strPswd = strVal;
>                    }
>                }
>            }
>           drv = (Driver)Class.forName(strDriver).newInstance();
>            DriverManager.registerDriver(drv);
>           props.setProperty("user",strUser.trim());
>            props.setProperty("password",strPswd.trim());
>
>            System.out.println("Attempting to connecting to postgres
> db...");
>            dbConn= DriverManager.getConnection(strServer, props);
>            System.out.println("Connected to postgres db.");
>        }
>        catch (IOException ioe)
>        {
>            System.out.println("Error trying to connect to postgres db:");
>            ioe.printStackTrace();
>            throw new Exception(ioe.getMessage());
>        }
>    }
>
> The error I get in the console is:
> Java Plug-in 1.6.0
> Using JRE version 1.6.0 Java HotSpot(TM) Client VM
> User home directory = C:\Documents and Settings\Marc
>
>
> ----------------------------------------------------
> c:   clear console window
> f:   finalize objects on finalization queue
> g:   garbage collect
> h:   display this help message
> l:   dump classloader list
> m:   print memory usage
> o:   trigger logging
> p:   reload proxy configuration
> q:   hide console
> r:   reload policy configuration
> s:   dump system and deployment properties
> t:   dump thread list
> v:   dump thread stack
> x:   clear classloader cache
> 0-5: set trace level to <n>
> ----------------------------------------------------
>
> Init applet.
> Call new DBConnection.
> Instantiate DBConnection.
> db.ini: Server:jdbc:postgresql://localhost/Arco
> db.ini: Driver:org.postgresql.Driver
> Attempting to connecting to postgres db...
> org.postgresql.util.PSQLException: Something unusual has occured to cause
> the driver to fail. Please report this exception.
>    at org.postgresql.Driver.connect(Driver.java:276)
>    at java.sql.DriverManager.getConnection(Unknown Source)
>    at java.sql.DriverManager.getConnection(Unknown Source)
>    at db.DBConnection.<init>(DBConnection.java:169)
>    at ui.BaseApplet.init(BaseApplet.java:138)
>    at sun.applet.AppletPanel.run(Unknown Source)
>    at java.lang.Thread.run(Unknown Source)
> Caused by: java.security.AccessControlException: access denied
> (java.net.SocketPermission 127.0.0.1:5432 connect,resolve)
>    at java.security.AccessControlContext.checkPermission(Unknown Source)
>    at java.security.AccessController.checkPermission(Unknown Source)
>    at java.lang.SecurityManager.checkPermission(Unknown Source)
>    at java.lang.SecurityManager.checkConnect(Unknown Source)
>    at java.net.Socket.connect(Unknown Source)
>    at java.net.Socket.connect(Unknown Source)
>    at java.net.Socket.<init>(Unknown Source)
>    at java.net.Socket.<init>(Unknown Source)
>    at org.postgresql.core.PGStream.<init>(PGStream.java:59)
>    at
> org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:77)
>    at
> org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:66)
>    at
> org.postgresql.jdbc2.AbstractJdbc2Connection.<init>(AbstractJdbc2Connection.java:125)
>    at
> org.postgresql.jdbc3.AbstractJdbc3Connection.<init>(AbstractJdbc3Connection.java:30)
>    at org.postgresql.jdbc3.Jdbc3Connection.<init>(Jdbc3Connection.java:24)
>    at org.postgresql.Driver.makeConnection(Driver.java:382)
>    at org.postgresql.Driver.connect(Driver.java:260)
>    ... 6 more
>
> I think that covers it. I'm pretty wiped out being as I've been working on
> this for about 4 hrs now.
> Your help is really appreciated!
>
> Thanks,
> Marc
>
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