Why this warning is rised when creating database in RAC?

Question

Oracle 11.2.0.3 RAC in RHEL 5.8
Whether in runinstall or in dbca,there is always a warning : 
Entreprise manager configuration succeded with  the following warning
Error starting Database Control on nodes rac2. Execute the following
command(s) on nodes:rac2.
1)Set the environment variable ORACLE_UNQNAME to Database unique name
2)/u01/apporacle/product/11.2.0/dbhome_1/bin/emctl start dbconsole
I have set it in /home/oracle/.bash_profile:
export ORACLE_UNQNAME=orcl.localdomain
export ORACLE_SID=orcl2
Why?How could I do?(I know I can execute it manaully). Thanks!

Answer 1

"The cast fromObject to List<String> is actually
checking against the erased type of List"
I m getting this warning whenever I am fetching any
List<String> from a
Map object.
headerList = (List<String>)listMap.get("headerList");Assuming the following code (or something similar) is before the line you posted
    HashMap<String, List<String>> listMap;
    ArrayList<String> headerList;
    //fill in map and some other stuffall you have to do is
    headerList = listMap.get("headerList");because ALL the values in the listMap MUST be List<String> objects
The warning/error tells you that you're trying to cast against a "generic type" which is actually erased when the code is compiled. Remember that generics are only compiletime checks. The cast should refer to a runtime type (generics are not runtime types). I hope I made myself clear. Feel free to ask any further doubts and even better, read the Tutorial