Logging and Error Handling

BladeSmith adds logging and error handling code throughout the generated source code.

You can add additional logging calls using the Log() method from the IfmxLog class. The Log() method calls the standard Java I/O package methods system.out.println() and system.err.println(). For more information on these methods, see the IBM Informix: JDBC Driver Programmer's Guide.

If the Java value object is used on the client, the Log() method writes the logging messages to the standard output. If the Java value object is used on the server, the Log() method writes the logging messages to the Java log file.

The Java log file is distinct from the main database server log file, online.log. The Java log file contains all logging and tracing messages specific to Java methods.

The Java log file is specified by the JVPLOG configuration parameter, which is set in the ONCONFIG file. By default, the Java log file is at the following location:

$INFORMIXDIR/extend/krakatoa/jvp.log 

You can change the location of the Java log file by setting the JVPLOG configuration parameter; see IBM Informix: J/Foundation Developer's Guide.

You can use the Java log entries when you debug a Java method; see Debugging a DataBlade Module.