[jira] (LOG4J2-3420) getlogger() UnsupportedOperationException when loaded by Class.forName()

["Ralph Goers (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-3420 ]


    Ralph Goers deleted comment on LOG4J2-3420:
    -------------------------------------

was (Author: ralph.goers@dslextreme.com):
What happens if you do
{code:java}
public class MyTextField extends JTextField {
  final private static Logger logger = LogManager.getLogger(MyTextField.class);
  public MyTextField(){}
} {code}

> getlogger() UnsupportedOperationException when loaded by Class.forName()
> ------------------------------------------------------------------------
>
>                 Key: LOG4J2-3420
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-3420
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 2.17.2
>         Environment: Several versions of log4j 2.
> Tried with several versions of jdk (the exception shown is jdk-17).
>  
>            Reporter: Ernie Rael
>            Priority: Major
>
> Exception arises when this class is used in the NetBeans guiBuilder.
> {code:java}
> public class MyTextField extends JTextField {
> final private static Logger logger = LogManager.getLogger();
> public MyTextField(){}
> }
> {code}
> Get the following exception when the bean is selected to drop on the gui.
> {noformat}
> INFO [org.netbeans.modules.form.MetaComponentCreator]: Cannot load component class play.MyTextField from unknown source.
> The class itself was found, but there was a problem initializing it, e.g. due to an exception in static initializer, or failure in loading an additional class needed by the component class. Check the attached exception.
> java.lang.UnsupportedOperationException: No class provided, and an appropriate one cannot be found.
> at org.apache.logging.log4j.LogManager.callerClass(LogManager.java:573)
> at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:598)
> at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:585)
> at play.MyTextField.<clinit>(MyTextField.java:35)
> Caused: java.lang.ExceptionInInitializerError
> at java.base/java.lang.Class.forName0(Native Method)
> at java.base/java.lang.Class.forName(Class.java:467)
> at org.netbeans.modules.form.project.ClassPathUtils.loadClass(ClassPathUtils.java:89)
> {noformat}
> This exception similarly occurs with clazz.newInstance(), which is sometimes used by the guiBuilder. It also occurs if the getLogger is in the constructor rather than a static.
> As a workaround, since I can compile the gui component, I'm invoking Stuff.getLogger()
> {code:java}
> public class Stuff {
> static Logger getLogger() {
>     try {
>         return LogManager.getLogger(StackLocatorUtil.getCallerClass(2));
>     } catch(UnsupportedOperationException ex) {}
>     return LogManager.getRootLogger();
> }
> }
> {code}



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