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Whenever I debug my code in Netbeans this appears:
log4j:WARN No appenders could be found for logger (org.apache.pdfbox.pdfparser.PDFObjectStreamParser).
log4j:WARN Please initialize the log4j system properly.
Why is this? Is this important?
The reason why you see this message is that your log4j configuration file(i.e. log4j.xml or log4j.properties) is NOT found in the classpath. Placing the log4j configuration file in the applications classpath should solve the issue.
Depends on requirement, if you want messages logged to a file with defined levels, then yes you need to fix this warning. Otherwise you may ignore.