Error OEM java.lang.Exception: Exception in sending Request :: null

Question

Hi there guys,
i get the error when i trying to connect to OEM java.lang.Exception: Exception in sending Request :: null
the installation went without any hitch,
the instance is up and running, but when i use the console i get the error
$emctl status dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.3.0
Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
http://erpdb.entp.hme:5500/em/console/aboutApplication
Oracle Enterprise Manager 10g is running.
$emctl status dbconsole
Oracle Enterprise Manager 10g Database Control Release 10.2.0.3.0
Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
http://erpdb.entp.hme:5500/em/console/aboutApplication
Oracle Enterprise Manager 10g is running.
Logs are generated in directory /oraprod/db/tech_st/10.2.0/erpdb.entp.hme_PROD/sysman/log
oraprod@erpdb [oraprod/db/tech_st/10.2.0]
$emctl status agent
Oracle Enterprise Manager 10g Database Control Release 10.2.0.3.0
Copyright (c) 1996, 2006 Oracle Corporation. All rights reserved.
Agent Version : 10.1.0.5.1
OMS Version : 10.1.0.5.0
Protocol Version : 10.1.0.2.0
Agent Home : /oraprod/db/tech_st/10.2.0/erpdb.entp.hme_PROD
Agent binaries : /oraprod/db/tech_st/10.2.0
Agent Process ID : 18734
Parent Process ID : 18327
Agent URL : http://erpdb.entp.hme:1830/emd/main
Started at : 2011-02-07 14:17:18
Started by user : oraprod
Last Reload : 2011-02-07 14:17:18
Last successful upload : 2011-02-08 08:27:46
Total Megabytes of XML files uploaded so far : 0.18
Number of XML files pending upload : 0
Size of XML files pending upload(MB) : 0.00
Available disk space on upload filesystem : 47.34%
Agent is Running and Ready
i have found in metalink that i must relink agent component and i try it but i still having the same error
i have found a warnings whenn i try to relink with this command
cd $ORACLE_HOME/sysman/lib
make -f ins_sysman.mk agent
(Bundled) cc: warning 1913:`/oraprod/db/tech_st/10.2.0/lib32/:/oraprod/db/tech_st/10.2.0/lib/:/oraprod/db/tech_st/10.2.0/sysman/lib32/:/oraprod/db/tech_st/10.2.0/jdk/jre/lib/IA64N/server:/oraprod/db/tech_st/10.2.0/jdk/jre/lib/IA64N' does not exist or cannot be read
but this not a problem because i have configured the db console in an other instance of my server and i have same error when reliking OEM agent but the dbconsole work fine.
this is the error msg given in :
<ORACLE_HOME>/<nodename_sid>/sysman/log/emoms.trc has:
2011-02-08 09:17:58,017 [MetricCollector:HOMETAB_THREAD600:60] ERROR rt.DbMetricCollectorTarget _getAllData.328 - oracle.sysman.emSDK.emd.comm.CommException: Exception in sending Request :: null
oracle.sysman.emSDK.emd.comm.CommException: Exception in sending Request :: null
at oracle.sysman.emSDK.emd.comm.EMDClient.getResponseForRequest_(EMDClient.java:1329)
at oracle.sysman.emSDK.emd.comm.EMDClient.getResponseForRequest(EMDClient.java:1222)
at oracle.sysman.emSDK.emd.comm.EMDClient.getMetrics(EMDClient.java:639)
at oracle.sysman.emo.perf.metric.rt.DbHomeTab._getAllData(DbHomeTab.java:324)
at oracle.sysman.emo.perf.metric.rt.DbHomeTab.getData(DbHomeTab.java:139)
at oracle.sysman.emo.perf.metric.eng.MetricCached.collectCachedData(MetricCached.java:402)
at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread._collectCachedData(MetricCollectorThread.java:596)
at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread.run(MetricCollectorThread.java:320)
at java.lang.Thread.run(Thread.java:534)
2011-02-08 09:18:16,256 [EMUI_09_18_16_/console/database/instance/sitemap] ERROR perf.sitemap initializeGeneral.400 - Failed to initialize object: ORA-20206:
ORA-06512: at "SYSMAN.EMD_DATABASE", line 1165
ORA-01403: no data found
ORA-06512: at line 1

Answer 1

Most probably your Enterprise Manager is missconfigured. You may require to reconfigure it, rebuild the repository and reconfigure your EM console.
Before you proceed. Has it ever worked?
Are all required services up and running?, i.e. listener, database?
Is your environment properly configured (envrionment variables)?
Are you able to start your console from the command line with the emctl start dbconsole command?
Please feedback.
~ Madrid.