Ошибка ora 12500

my spring-hibernate application run without problem for the past 1 week, but suddenly i get below error. will this caused by configuration error in applicationContext.xml? there is no error on my oracle10g log files (i get below errror every 1-2weeks once)

28 Jul 2010 14:20:19,177 INFO [http-2020-19] - Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
28 Jul 2010 14:20:19,224 INFO [http-2020-19] - SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase]
28 Jul 2010 14:20:19,240 WARN [http-2020-19] - Error while extracting database product name - falling back to empty error codes
org.springframework.jdbc.support.MetaDataAccessException: Could not get Connection for extracting meta data; nested exception is org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLException: Listener refused the connection with the following error:
ORA-12500, TNS:listener failed to start a dedicated server process
The Connection descriptor used by the client was:
10.1.0.23:1521:myserver

 at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:293)
 at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
 at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:216)
 at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:140)
 at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.<init>(SQLErrorCodeSQLExceptionTranslator.java:103)
 at org.springframework.orm.hibernate3.SessionFactoryUtils.newJdbcExceptionTranslator(SessionFactoryUtils.java:145)
 at org.springframework.orm.hibernate3.HibernateAccessor.getDefaultJdbcExceptionTranslator(HibernateAccessor.java:453)
 at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:410)
 at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:424)
 at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
 at org.springframework.orm.hibernate3.HibernateTemplate.findByCriteria(HibernateTemplate.java:1055)
 at com

my applicationcontext.xml hibernate config

<property name="hibernateProperties">
    <props>



        <prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
        <prop key="hibernate.show_sql">false</prop>
        <prop key="hibernate.format_sql">false</prop>
        <prop key="hibernate.use_sql_comments">false</prop>
        <prop key="hibernate.cglib.use_reflection_optimizer">true</prop>  


                      <prop key="hibernate.c3p0.min_size">10</prop>
                        <prop key="hibernate.c3p0.max_size">100</prop>
                        <prop key="hibernate.c3p0.timeout">10</prop>
                        <prop key="hibernate.c3p0.acquireRetryAttempts">30</prop>

                        <prop key="hibernate.c3p0.acquireIncrement">5</prop>

                        <prop key="hibernate.c3p0.idleConnectionTestPeriod">100</prop>

                        <prop key="hibernate.c3p0.initialPoolSize">20</prop>
                        <prop key="hibernate.c3p0.maxPoolSize">100</prop>
                        <prop key="hibernate.c3p0.maxIdleTime">300</prop>
                        <prop key="hibernate.c3p0.maxStatements">50</prop>
                        <prop key="hibernate.c3p0.minPoolSize">10</prop>
                        <prop key="hibernate.c3p0.preferredTestQuery">SELECT 1 FROM DUAL</prop>
                        <prop key="hibernate.c3p0.testConnectionOnCheckout">true</prop>



      <prop key="hibernate.cache.provider_class">

                                                    org.hibernate.cache.EhCacheProvider
        </prop>
        <prop key="hibernate.cache.use_second_level_cache">true</prop>
        <prop key="hibernate.cache.use_query_cache">true</prop>




    </props>
</property>

Часовой пояс GMT +3, время: 19:53.

There is a lot of stuff here that does not make sense to me…..
There has to be something a little more simpler…..
here is a copy of my init file

db_name = «MISOS»

instance_name = MISOS

service_names = MISOS

db_files = 1024

control_files = («E:OracleoradataMISOScontrol01.ctl», «E:OracleoradataMISOScontrol02.ctl», «E:OracleoradataMISOScontrol03.ctl»)

open_cursors = 100
max_enabled_roles = 30
db_file_multiblock_read_count = 8

db_block_buffers = 21316

shared_pool_size = 58209280

large_pool_size = 614400
java_pool_size = 0

log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800

processes = 50

parallel_max_servers = 5

log_buffer = 32768

#audit_trail = true  # if you want auditing
#timed_statistics = true  # if you want timed statistics
max_dump_file_size = 10240  # limit trace file size to 5M each

# Uncommenting the line below will cause automatic archiving if archiving has
# been enabled using ALTER DATABASE ARCHIVELOG.
# log_archive_start = true
# log_archive_dest_1 = «location=C:OracleoradataMISOSarchive»
# log_archive_format = %%ORACLE_SID%%T%TS%S.ARC

# If using private rollback segments, place lines of the following
# form in each of your instance-specific init.ora files:
#rollback_segments = ( RBS0, RBS1, RBS2, RBS3, RBS4, RBS5, RBS6 )

# Global Naming — enforce that a dblink has same name as the db it connects to
global_names = true

# Uncomment the following line if you wish to enable the Oracle Trace product
# to trace server activity.  This enables scheduling of server collections
# from the Oracle Enterprise Manager Console.
# Also, if the oracle_trace_collection_name parameter is non-null,
# every session will write to the named collection, as well as enabling you
# to schedule future collections from the console.
# oracle_trace_enable = true

oracle_trace_collection_name = «»
# define directories to store trace and alert files
background_dump_dest = E:OracleadminMISOSbdump
#Uncomment this parameter to enable resource management for your database.
#The SYSTEM_PLAN is provided by default with the database.
#Change the plan name if you have created your own resource plan.# resource_manager_plan = system_plan
user_dump_dest = E:OracleadminMISOSudump

db_block_size = 8192

remote_login_passwordfile = exclusive

os_authent_prefix = «»

distributed_transactions = 10
compatible = 8.1.0
sort_area_size = 65536
sort_area_retained_size = 65536

**************************************************************************************
Here’s my SQLNET.ORA file

# SQLNET.ORA Network Configuration File: C:OracleOra81networkadminsqlnet.ora
# Generated by Oracle configuration tools.

#SQLNET.AUTHENTICATION_SERVICES= (NTS)

NAMES.DIRECTORY_PATH= (TNSNAMES, ONAMES, HOSTNAME)

**************************************************************************************
**************************************************************************************
Here’s the listner file

# LISTENER.ORA Network Configuration File: C:OracleOra81networkadminlistener.ora
# Generated by Oracle configuration tools.

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
      )
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = homer)(PORT = 1521))
      )
    )
    (DESCRIPTION =
      (PROTOCOL_STACK =
        (PRESENTATION = GIOP)
        (SESSION = RAW)
      )
      (ADDRESS = (PROTOCOL = TCP)(HOST = homer)(PORT = 2481))
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:OracleOra81)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = MISOS)
      (ORACLE_HOME = C:OracleOra81)
      (SID_NAME = MISOS)
    )

Please I need this resolved….why is this such a pain….had this all working on other server.