Hi Chris, my web app META-INF/lib has log4j jar, but CATALINA_BASE/lib does not have log4j jar listed. It should be double loading class issue. I need to find out how to exclude the unwanted classloading. -aj
On Thu, May 7, 2020 at 2:48 PM Christopher Schultz < ch...@christopherschultz.net> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > AJ, > > On 5/7/20 16:40, AJ Chen wrote: > > I use eclipse to develop web app for tomcat, Web app has a > > dependent project and so the dependent project and all jars are > > added on the classpath for tomcat runtime. Log4j works on tomcat 6. > > But after upgrate to tomcat 9, log4j failed to start with the > > following error. Anyone has seen similar problem? log4j2 also > > failed. Thanks. > > > > log4j:ERROR A "org.apache.log4j.DailyRollingFileAppender" object is > > not assignable to a "org.apache.log4j.Appender" variable. > > log4j:ERROR The class "org.apache.log4j.Appender" was loaded by > > log4j:ERROR [sun.misc.Launcher$AppClassLoader@18b4aac2] whereas > > object of type log4j:ERROR > > "org.apache.log4j.DailyRollingFileAppender" was loaded by > > [ParallelWebappClassLoader > > Can I just say that the above is a masterpiece of diagnostic error > messaging? > > I can already tell that you have a classloading issue, and it's almost > certain that you have log4j.jar both in CATALINA_BASE/lib and your web > application's META-INF/lib directory. Is that the case? > > - -chris > -----BEGIN PGP SIGNATURE----- > Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ > > iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl60gjsACgkQHPApP6U8 > pFgydxAAvnJ1tJFklOMnsHnx+gFn7m0UkWjs1Sj+1zurmjuAzd64aXjwt8Mh2FRH > JaJ4R0kYaHruoJxNDKelS+FIYgn1qe7D7LE7uq6gmNHg5b1JruoUXbk2GcaTfM55 > htu9idB/JOyx5lmlP4tR6E/K7HctM6h2A7zuJ2s98VM2WljU/Ts6v5R1C53JbXq6 > gzB0g6XYyVnuQx/9qoSyOSqKIBp3jLp2G8JlKje7SzKZcJeXSzq0HPUX6Do15VK1 > Rl8ineKRjwDHgujjN3DiXqh+BnbdY6URsFApwGVxNLqh/ykIQYIHVxCGuRv9+W3D > i0Uxx9C2p6rb6Nr8Tk6lxZjx1IMCC0JuKaunHPt6bQ26s/VNEROU5aztQ5RF/ynN > pjFvwa/UIR6/i5u7mtGo2WBRLmH04KOu/7ZS8FL4ieKHXuaGGDvZlTe3AZ8hBPNx > 2jHtmpqWiQaw1+lMnL7RxrmGBISIWSH4+MAKXWDzM4OSeTsKxTv2gcZ14Z9HfYZm > JGO3DGgOSfWAnFSTYX9L/NodRfIDXLMPTAG/epWzSSiF5tf6nAzWNj6Vbi1L0VnS > 8IdfqHavSGeIqhDqwTSwuQhXYdoc6AyBdY5WIYEGiUNu789b9SjNlY8/EWqjrJKx > 3Au9YxYkMTqi2SL/r1cCd8HU+imS9L3aSZPKaOn73AsTtux/VCA= > =IVj+ > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
