Jean-frederic Clere wrote:
I have a "strange" error:
+++
java.lang.NoSuchMethodError:
org/apache/log4j/Category.log(Ljava/lang/String;Lorg/apache/log4j/Level;Ljava/lang/Object;Ljava/lang/Throwable;)V
at java.lang.VMThrowable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Throwable.java:498)
at java.lang.Throwable.<init>(Throwable.java:159)
at java.lang.Error.<init>(Error.java:81)
at java.lang.LinkageError.<init>(LinkageError.java:72)
at
java.lang.IncompatibleClassChangeError.<init>(IncompatibleClassChangeError.java:71)
at java.lang.NoSuchMethodError.<init>(NoSuchMethodError.java:72)
at java.lang.VMClass.forName(Native Method)
at java.lang.Class.forName(Class.java:161)
at toto.main(toto.java:8)
+++
Looking log4j I have found the following in Category.java:
+++
void log(String callerFQCN, Priority level, Object message, Throwable t)
+++
and in Level.java :
+++
public class Level extends Priority implements Serializable {
+++
So why is the method log no found?
The method matching algorithm that would allow a method having
2nd parameter type "Priority" to be used for an invocation that
has a 2nd parameter of type "Level" happens during compilation,
not runtime. In other words, an "incompatible class change" has
truly occurred it seems and in such a case the exception is
expected.
However, how did the classes change? I tried to reproduce this
with log4j-1.2.13 but couldn't. Can you give more detail on how
you compiled Classpath and what version of log4j you're using?
-Archie
__________________________________________________________________________
Archie Cobbs * CTO, Awarix * http://www.awarix.com
