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https://issues.apache.org/jira/browse/LOG4J2-3420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499668#comment-17499668
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Ralph Goers commented on LOG4J2-3420:
-------------------------------------
I am looking at all the getLogger methods and they do not look correct to me at
all. They should be attempting to get the ClassLoader of the caller but they
don't seem to be doing that at all.
I will need to either look at existing unit tests or create new ones.
> 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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