I had the same problem as above initially.  Then after commenting out 
      <depends>jboss:service=Hypersonic,database=localDB</depends>
  | 
I got a much more serious error that caused jboss-4.0.1 to loop indefinitely 
after complaining:
2005-01-18 19:20:42,129 WARN  
[org.jboss.resource.connectionmanager.JBossManagedConnectionPool] Throwable 
while attempting to get a new connection: null
org.jboss.resource.JBossResourceException: Could not create connection; - 
nested throwable: (java.sql.SQLException: socket creation error)
        at 
org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:161)
        at 
org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:508)
        at 
org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:207)
------------------
Finally, I saw the suggested fix above, but it was ambiguous about exactly what 
to do to fix it.  Eventually, I figured it out, but for the sake of others who 
might have the same problem here is the entire hsqldb-ds.xml file changed so 
Hypersonic will use port 1701:

  | <?xml version="1.0" encoding="UTF-8"?>
  | 
  | <!-- The Hypersonic embedded database JCA connection factory config
  | $Id: hsqldb-ds.xml,v 1.15 2004/09/15 14:37:40 loubyansky Exp $ -->
  | 
  | <datasources>
  |    <local-tx-datasource>
  |       <!-- The jndi name of the DataSource, it is prefixed with java:/ -->
  |       <!-- Datasources are not available outside the virtual machine -->
  |       <jndi-name>DefaultDS</jndi-name>
  | 
  |       <!-- for tcp connection, allowing other processes to use the hsqldb
  |       database. This requires the org.jboss.jdbc.HypersonicDatabase mbean.
  | -->
  |       <connection-url>jdbc:hsqldb:hsql://localhost:1701</connection-url>
  | 
  |       <!-- for totally in-memory db, not saved when jboss stops. 
  |       The org.jboss.jdbc.HypersonicDatabase mbean necessary
  |       <connection-url>jdbc:hsqldb:.</connection-url>
  | -->
  |       <!-- for in-process persistent db, saved when jboss stops. The
  |       org.jboss.jdbc.HypersonicDatabase mbean is necessary for properly db 
shutdown
  |       
<connection-url>jdbc:hsqldb:${jboss.server.data.dir}${/}hypersonic${/}localDB</connection-url>
  | -->
  | 
  |       <!-- The driver class -->
  |       <driver-class>org.hsqldb.jdbcDriver</driver-class>
  | 
  |       <!-- The login and password -->
  |       <user-name>sa</user-name>
  |       <password></password>
  | 
  |       <!--example of how to specify class that determines if exception 
means connection should be destroyed-->
  |       
<!--exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.DummyExceptionSorter</exception-sorter-class-name-->
  | 
  |       <!-- this will be run before a managed connection is removed from the 
pool for use by a client-->
  |       <!--<check-valid-connection-sql>select * from 
something</check-valid-connection-sql> -->
  | 
  |       <!-- The minimum connections in a pool/sub-pool. Pools are lazily 
constructed on first use -->
  |       <min-pool-size>5</min-pool-size>
  | 
  |       <!-- The maximum connections in a pool/sub-pool -->
  |       <max-pool-size>20</max-pool-size>
  | 
  |       <!-- The time before an unused connection is destroyed -->
  |       <!-- NOTE: This is the check period. It will be destroyed somewhere 
between 1x and 2x this timeout after last use -->
  |       <!-- TEMPORARY FIX! - Disable idle connection removal, HSQLDB has a 
problem with not reaping threads on closed connections -->
  |       <idle-timeout-minutes>0</idle-timeout-minutes>
  | 
  |       <!-- sql to call when connection is created
  |         <new-connection-sql>some arbitrary sql</new-connection-sql>
  |       -->
  | 
  |       <!-- sql to call on an existing pooled connection when it is obtained 
from pool 
  |          <check-valid-connection-sql>some arbitrary 
sql</check-valid-connection-sql>
  |       -->
  | 
  |       <!-- example of how to specify a class that determines a connection 
is valid before it is handed out from the pool
  |          
<valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.DummyValidConnectionChecker</valid-connection-checker-class-name>
  |       -->
  | 
  |       <!-- Whether to check all statements are closed when the connection 
is returned to the pool,
  |            this is a debugging feature that should be turned off in 
production -->
  |       <track-statements/>
  | 
  |       <!-- Use the getConnection(user, pw) for logins
  |         <application-managed-security/>
  |       -->
  | 
  |       <!-- Use the security domain defined in conf/login-config.xml -->
  |       <security-domain>HsqlDbRealm</security-domain>
  | 
  |       <!-- Use the security domain defined in conf/login-config.xml or the
  |            getConnection(user, pw) for logins. The security domain takes 
precedence.
  |         
<security-domain-and-application>HsqlDbRealm</security-domain-and-application>
  |       -->
  | 
  |       <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml 
(optional) -->
  |       <metadata>
  |          <type-mapping>Hypersonic SQL</type-mapping>
  |       </metadata>
  | 
  |       <!-- This mbean can be used when using in process persistent 
hypersonic
  |       <depends>jboss:service=Hypersonic,database=localDB</depends>
  |  -->
  |       <depends>jboss:service=Hypersonic</depends>
  |    </local-tx-datasource>
  | 
  |    <!-- This mbean should be used only when using tcp connections. Uncomment
  |    when the tcp based connection-url is used. 
  |  -->
  |    <mbean code="org.jboss.jdbc.HypersonicDatabase" 
  |      name="jboss:service=Hypersonic">
  |      <attribute name="Port">1701</attribute>
  |      <attribute name="Silent">true</attribute>
  |      <attribute name="Database">default</attribute>
  |      <attribute name="Trace">false</attribute>
  |      <attribute name="No_system_exit">true</attribute>
  |    </mbean>
  | 
  |    <!-- This mbean can be used when using in process persistent db
  |    <mbean code="org.jboss.jdbc.HypersonicDatabase" 
  |      name="jboss:service=Hypersonic,database=localDB">
  |      <attribute name="Database">localDB</attribute>
  |      <attribute name="InProcessMode">true</attribute>
  |    </mbean>
  |  -->
  | </datasources>
  | 

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