Connecting to the Oracle 10g Database through Java code

I have a Oracle 10g database to be connected to.
Through sql plus, I can connect to it using the following command
sqlplus "sys@pmi as sysdba"and password is 'password'
how do I connect to this db through my Java code?
I tried
_connection = DriverManager.getConnection("jdbc:oracle:thin:@10.245.4.100:1521:pmi as sysdba", "sys", "password");but it gave the exception "ExceptionIo exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=169869568)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))"
I also tried
_connection = DriverManager.getConnection("jdbc:oracle:thin:@10.245.4.100:1521:pmi", "sys", "password");but this gives the exception "ExceptionORA-28009: connection as SYS should be as SYSDBA or SYSOPER"
Can anyone please help me in writing the line of code

You need to use the getConnection syntax that requires a Properties object.
http://www.oracle.com/technology/tech/java/sqlj_jdbc/htdocs/jdbc_faq.htm#05_05
- cafal

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And make sure that the pfile or spfile has:
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