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");

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

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3. How do I resolve "code too large for try statement" errors?
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9. What tools are available for automated functional (regression) testing of a COBOL application?
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11. Where can I obtain a copy of the ANSI 2002 COBOL standard?
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13. How do I increase the maximum Java heap size when compiling?
14. How can I tell what changes were made in the isCOBOL latest update?
15. How do I turn on debug trace to produce a log file?
16. How do I determine what properties are set?
17. Should I use JISAM or Veryant's c-treeRTG?
18. How would I create my own CBL_ALLOC_MEM and CBL_FREE_MEM routines?
19. What is the best way to control Microsoft Word?
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22. How do I specify properties or a properties file on the command line?
23. Where can I find more information on A$ENCRYPT and A$DECRYPT?
24. Does isCOBOL work with Flexus COBOL sp2?
25. How do I change the icon in the upper left corner of the Window?
26. What is the behavior difference of STOP THREAD?
27. Sending SMTP mail
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29. How do I select 11x17 paper size using WIN$PRINTER?
30. Where can I learn more about Classpath, the Java class loader, JDK tools and utilities?
31. What are the key technical advantages of isCOBOL?
32. Why do I get the error message "Native call not found" and how do I fix the problem?
33. Why do I get the error java.lang.NoClassDefFoundError: com/iscobol/rts_n/StopRunException?
34. Can Veryant recommend a good Web site to find 3rd party JavaBeans?
35. I still get the error : "Missing License: The license key is missing, invalid or has expired!" I can't figure out why
36. What compile option should I use for ICOBOL compatibility?
37. Can isCOBOL access a DLL or .so that is in a JAR file?
38. How do I compile fixed (ANSI) format source that COPYs terminal format source or vice versa?
39. Can I use directory paths in CALL names?
40. How do I configure file locations with environment variables?
41. Is your runtime library backward compatible?
42. What algorithm does isCOBOL use to load framework properties (runtime config variables)?
43. How do I set iscobol.file.index.FileName with variable file name assignments?
44. What is the easiest and/or best way to convert a legacy text-based user interface to a web front end?
45. How can I make my isCOBOL program to be called instead of a C routine when both have the same name?
46. Is isCOBOL backward compatible?
47. How do I specify which file status codes I want to use?
48. Does isCOBOL APS run on z/OS?
49. Is there any equivalent to COPY RESOURCE?
50. Does isCOBOL support C$REDIRECT?
51. Why do I get the error message “java.lang.UnsatisfiedLinkError: no ### in java.library.path?
52. What is the best way to profile an isCOBOL program?
53. How do I write my own replacement for a C$ library routine?
54. What should I use for USAGE HANDLE items instead of NULL?
55. How can I avoid the "java.lang.OutOfMemoryError: PermGen space" error?
56. Can you derive isCOBOL object classes from Java and vice versa?
57. Can the file system (iscobol.file.index) be set programmatically?
58. I've heard there is a problem passing pointers to C functions. What is it?
59. How can I monitor a jvm started on a remote computer box?
60. How do I get more information when I get java.lang.reflect.InvocationTargetException?
61. Does isCOBOL support Crystal Reports or other Report Writers?
62. How do I suppress multiple reserved words with the -rw compiler option?
63. Why do I get the error message "java.lang.NullPointerException" ?
64. Why do I get the error message "java.lang.ArrayIndexOutOfBoundsException" ?
65. Can I call an RMCobol program passing parameters to it?
66. What does mean the error NO X11 DISPLAY?
67. How can I encode a URL String?
68. What can I use to perform an email validation during entry-field accept?
69. Working with sequential files on Pipes
70. How do I resolve the error "java.lang.NoClassDefFoundError" or "java.lang.ClassNotFoundException"?
71. Does isCOBOL support C$XML or other XML interfaces?
72. Is there any way to direct the output from the "Print Screen" keyboard key directly to a printer?
73. Why do I get the error "Could not load the main class" ?
74. Did you know isCOBOL IDE allows you to easily understand how to invoke a method in a Java Class?
75. Did you know you could set a background image from isCOBOL IDE's painter?
76. How to replace a text within a string with a different length of text.
77. How to write custom information inside isCOBOL log file
78. How to programmatically set the attributes for PDFs?
79. How can I read data correctly from a line-sequential file that has a different encoding from the one used by isCOBOL?
80. Did you know you can encrypt the communication with the isCOBOL Server?
81. GIT Server (Linux) - Install and Configuration
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86. How do I point my installed isCOBOL to a different Java location?
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