isCOBOL General

It’s very important to keep in mind that the isCOBOL configuration is built up by merging multiple files and settings. The runtime framework searches for configuration properties in the following list of places: The configuration file specified... Read More

You can create a simple or complex type definition that can be consistently and easily reused with other variables without having to copy and paste the contents of the original one. This is done using the TYPEDEF clause in the data description.  ... Read More

To solve this problem you can normally read the line-sequential file, then before using the contents of the record you can call a specific function for the translation. If you’re using isCOBOL 2023R1 or later, you can use the C$STRING_CONVERT... Read More

Sometimes a client connection can get disconnected from the application server, but still run in a loop in the background. This might happen, for instance, if a program crashes or is killed ‘ungracefully’. The application server’s... Read More

If you prefer to use OOP syntax to invoke a COBOL procedural program and pass an array of objects as parameters rather than the standard COBOL CALL statement with USING, isCOBOL provides a feasible approach. First, the isCOBOL class com.iscobol.java... Read More

QR codes can be generated as bitmap files using the ZXing (Zebra Crossing) barcode scanning library.All the file types supported by the W$BITMAP routine can be used. Here are the steps to compile and run the sample COBOL program (QRSAMPLE.cbl) which... Read More

It is often necessary and desirable to prevent the misuse of user licenses or to avoid idle thin-client threads on the isCOBOL Application server. Automatically terminating a thin-client session that has been left idle on an accept statement of a... Read More

The "java.net.SocketException: Permission denied: connect" exception message may happen when you are working in Application Server or with a client/server environment via VPN connection. This message is returned because isCOBOL uses the IPv4 type... Read More

When you get this error: "No X11 DISPLAY variable was set, but this program performed an operation which requires it." It means that isCOBOL is trying to access the AWT/SWING GUI Interface and your system doesn't have that. If your... Read More

You can use regular expressions in your entry-field to validate the contents accepted, and return an error message if necessary. The following example shows how to declare regular expression on a screen section entry-field: ... 03... Read More