Smartgwt 12.1 Exception in Init.go() with SLF4j

[helmut]

Hello Smartgwt team,

after upgrading from 12p to 12.1p 20200401 we are getting following error during application start, 12.0p 20190929 works without any error with the same configuration.

Isomorphic Init: Exception in Init.go()
java.lang.NoClassDefFoundError: org/apache/log4j/AppenderSkeleton
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:757)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2415)
    at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:863)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1332)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
    at com.isomorphic.base.ISCInit.initServiceThreads(ISCInit.java:249)
    at com.isomorphic.base.ISCInit.go(ISCInit.java:228)
    at com.isomorphic.base.InitListener.oneTimeIdempotentInit(InitListener.java:98)
    at com.isomorphic.base.InitListener.contextInitialized(InitListener.java:91)

We are using SLF4J with logback, so the loggings produced by smartgwt are handled by slf4j and logback.

Following properties are set
iscUseSlf4j=true
iscUseLog4jConfig=false


Do you have some hint, what could be wrong here?
As i have seen, in ISCInit.initServiceThreads() there is a static methode Log4jDataSourceAppender.requiresDataSourceDispatcher() called, where the Log4jDataSourceAppender extends AppenderSkeleton - which is part of log4j only.

In my opinion the call for Log4jDataSourceAppender should called only when using log4j or am I on the wrong track?

Thank you in advance!
Helmut

[Isomorphic]

You're right, Log4jDataSourceAppender should be called only when using log4j. This is fixed and is available for download in nightly builds.

[helmut]

That fixed it, thank you.