Do I need to worry about the compile warning "Note: MYPROG.java uses unchecked or unsafe operations?"

In isCOBOL you may get a Java note saying something similar to
"... uses unchecked or unsafe operations."
This warning is displayed when you execute code which the Java compiler considers to be lacking in error-checking, or potentially unsafe in some way.
This is just a warning though, and won't stop your code from compiling and running.

You can recompile the source code with -jo="-Xlint:unchecked" option to see a more specific message. For instance:

   java com.iscobol.compiler.Pcc -jo="-Xlint:unchecked" *.cbl
   I --> IsControlSet.cbl
   Compiling result
   Informational(s) - 0
   Warning(s) - 0
   Error(s) - 0
   Severe error(s) - 0
   II--> ISCONTROLSET.java
   ISCONTROLSET.java:2852: warning: [unchecked] unchecked call to addElement(E)as a member of the raw type java.util.Vector       VECT.addElement("Year 2001");

Though this note will not affect your application run, the code causing the error could have been remoted in a newer version of isCOBOL, as we continually strive to improve our product.
Therefore, you have two options. You can:

1. Ignore this warning.
2. Upgrade to a newer isCOBOL version, and report the error to support if it still occurs.