Check if Java is installed in Oracle

Administrator — Wed, 06 Jun 2007 15:52:49 +0000

If you want to know if Java is installed, use the following SQL :

  select * from dba_registry;

There should be an entry with comp_id equal to ‘JAVAVM’.

jwhich : which for Java

Administrator — Thu, 24 Oct 2002 10:36:00 +0000

This little ksh script can be used to find which class file is in which jar file in the current directory. Useful if you have a lib directory full of jar files and your program says ‘cannot find class xxx’.

   for jarfile in `ls *.jar`
   do
      echo $jarfile ":";
      jar tf $jarfile | grep -i $1;
   done;

Save this to a file (eg jwhich), set the permissions to execute. make sure it is on the path and then type :

   > jwhich customer

This will show a list of all the jar files and the classes that have a name with customer in it.

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Check if Java is installed in Oracle

jwhich : which for Java