Description of problem:
Installed onto system with PostgreSQL 9.0.2. postgres user existed in database, but password had been changed from default of 'postgres'. Dashboard showed PostgreSQL service as down even though it was running (verified with queries in the pgAdmin3 tool). No configuration was available on the postgres page in the inventory.

Checking the agent.log gave the following error:

2011-02-07 18:23:15,898 INFO  [ResourceContainer.invoker.daemon-10] (org.rhq.plugins.postgres.PostgresDiscoveryComponent)- Failed to connect to the database
org.postgresql.util.PSQLException: FATAL: password authentication failed for user "postgres"
	at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:291)
	at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:108)
	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.jdbc3g.AbstractJdbc3gConnection.<init>(AbstractJdbc3gConnection.java:22)
	at org.postgresql.jdbc4.AbstractJdbc4Connection.<init>(AbstractJdbc4Connection.java:30)
	at org.postgresql.jdbc4.Jdbc4Connection.<init>(Jdbc4Connection.java:24)
	at org.postgresql.Driver.makeConnection(Driver.java:393)
	at org.postgresql.Driver.connect(Driver.java:267)
	at java.sql.DriverManager.getConnection(DriverManager.java:582)
	at java.sql.DriverManager.getConnection(DriverManager.java:185)
	at org.rhq.plugins.postgres.PostgresDiscoveryComponent.buildConnection(PostgresDiscoveryComponent.java:230)
	at org.rhq.plugins.postgres.PostgresServerComponent.getConnection(PostgresServerComponent.java:135)
	at org.rhq.plugins.postgres.PostgresServerComponent.getAvailability(PostgresServerComponent.java:117)
	at sun.reflect.GeneratedMethodAccessor46.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.rhq.core.pc.inventory.ResourceContainer$ComponentInvocationThread.call(ResourceContainer.java:525)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)

I changed the postgres user password back to 'postgres' and the service was able to find the postgres service without logging an error message.

Version-Release number of selected component (if applicable):
rhq-enterprise-agent-4.0.0.B02
rhq-server-4.0.0.B02
PostgreSQL 9.0.2

How reproducible:

Steps to Reproduce:
1. Install PostgreSQL.
2. Change the password for the postgres user.
3. Install the RHQ server and agent and go through autodiscovery.
4. Accept all discovered services.
  
Actual results:
Unable to access postgres server.

Expected results:
Password would be handled somehow.

Additional info:
After resetting postgres user password and restarting agent, error on postgres server went away.