I'm using the OPAL framework to implement static analyses. I wondered if it is possible to suppress the console output of the framework which is printed on the console while execution. The following shows a part of the output.
...
[info][OPAL] Bytecod Representation - Development Build (asserstions are enables)
[info][project configuration] the JDK is part of the analysis
[warn][project configuration] supertype information incomplete
...
I found that OPAL has several LogLevels (i.e. WARN, INFO, ERROR) but I couldn't find a way to specify the logging granularity. I'm really interested in warnings and errors but I would like to suppress the (massive) output at info level.
By now I figured out that it is possible to suppress the console output of OPAL. The OPAL logging mechanism uses several LogContext objects. It exists one GlobalLogContext and one LogContext per available Project. Since both are independent it is necessary to silence both types.
The first context is used for every logging event which does not happen in the context of a specific project whereas the project-specific context is used to log messages in a given context.
The OPALLogger.update(...) method can be used to update the Logger that is used for a LogContext. With this method, it is possible to associate a new Logger with a LogContext. If you are running OPAL with the command line, a ConsoleOPALLogger can be used as follows.
val project = ...
OPALLogger.updateLogger(project.logContext, new ConsoleOPALLogger(true, org.opalj.log.Error))
OPALLogger.updateLogger(GlobalLogContext, new ConsoleOPALLogger(true, org.opalj.log.Error))