Re: Applet Connectivity - PLEASE help

Have a look at this tutorial:

http://java.sun.com/developer/technicalArticles/Security/Signed/

Am Dienstag, den 23.01.2007, 00:26 -0500 schrieb Marc:
> 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
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: if posting/reading through Usenet, please send an appropriate
> subscribe-nomail command to majordomo(at)postgresql(dot)org so that your
> message can get through to the mailing list cleanly