SQL Developer: Not able to view tables

Question

I am new to sqldeveloper and oracle products. I've recently installed sqldeveloper onto my pc, i am able to connect to the database but when i try and expand the tables item in the treeview i dont get the tables displayed and the error Warning, unhandled exception:Closed connection is shown in the logging page at the bottom. I have uninstalled the oracle client, jdk but still i keep getting this problem.
Current versions are
Operating System= Windows 7 32bit
SQLDeveloper=3.0.03
JDK=1.6.0_21
Oracle Client=11g

Answer 1

It looks like it may be a privilege issue.
I ran SQL Developer with 'IncludeConfFile sqldeveloper-debug.conf' in the 'sqldeveloper.conf' file. I got the following log output when I connected to XXAPI (which hangs) and XX (which works)
For XXAPI, 'oracle.dbtools.db.DBUtil' generates
Prepared:SELECT object_type type, SYS_CONTEXT('USERENV','CURRENT_SCHEMA') owner, object_name, null column_name, null column_id, null data_type
FROM user_objects
WHERE object_type ='TABLE' and object_name not like 'BIN$%' and rownum <=50
union all
SELECT object_type type, SYS_CONTEXT('USERENV','CURRENT_SCHEMA') owner, object_name, null column_name, null column_id, null data_type
FROM user_objects
WHERE      object_type ='VIEW' and object_name not like 'BIN$%' and rownum <=50
and the following log message
oracle.dbtools.raptor.controls.grid.RaptorGridPersistedSettings - Persisted settings for this table could not be loaded
For XX, 'oracle.dbtools.db.DBUtil' generates
Prepared:
select * from (
SELECT o.OBJECT_NAME, o.OBJECT_ID ,'' short_name, NULL partitioned,
NULL iot_type,
o.OWNER OBJECT_OWNER, o.CREATED, o.LAST_DDL_TIME, O.GENERATED, O.TEMPORARY, NULL EXTERNAL
FROM SYS.ALL_OBJECTS O
WHERE O.OWNER = :SCHEMA
AND O.OBJECT_TYPE = 'TABLE'
union all
SELECT OBJECT_NAME, OBJECT_ID , syn.SYNONYM_NAME short_NAME, NULL partitioned,
NULL iot_type,
SYN.TABLE_OWNER OBJECT_OWNER, o.CREATED, o.LAST_DDL_TIME, O.GENERATED, O.TEMPORARY, NULL EXTERNAL
FROM SYS.ALL_OBJECTS O, sys.user_synonyms syn
WHERE syn.table_owner = o.owner
and syn.TABLE_NAME = o.object_NAME
and o.object_type = 'TABLE'
and :INCLUDE_SYNS = 1
WHERE /**/OBJECT_NAME NOT IN (SELECT OBJECT_NAME FROM RECYCLEBIN)
AND not object_name like 'BIN$%'
which works
-----