Cannot bind log4j to slf4j / multiple SLF4J bindings

[raoulduke98]

I'm using BIRT Runtime 4.13 in a Java Web Application which is built and managed with gradle. I want to integrate Java Util Logging as well as Log4J via SLF4J. Therefore, I add dependencies to my project:

// parts of birt runtime run with java util logging
api "org.slf4j:jul-to-slf4j:${slf4jBridgeVersion}"
// log4j2 in my app
api "org.apache.logging.log4j:log4j-api:${log4jVersion}"
api "org.apache.logging.log4j:log4j-core:${log4jVersion}"
// bind slf4j to log4j2
api "org.apache.logging.log4j:log4j-slf4j-impl:${log4jVersion}"

For correct usage of JUL, I added this to my Java code:
SLF4JBridgeHandler.install()

However, I receive a "Multiple SLF4J bindings" error at runtime:

[err] SLF4J: Class path contains multiple SLF4J bindings.
[err] SLF4J: Found binding in [wsjar:file:/C:/Users/***/.gradle/caches/modules-2/files-2.1/org.eclipse.birt.runtime/org.eclipse.birt.runtime/4.13.0/***/org.eclipse.birt.runtime-4.13.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
[err] SLF4J: Found binding in [wsjar:file:/C:/Users/***/.gradle/caches/modules-2/files-2.1/org.apache.logging.log4j/log4j-slf4j-impl/2.20.0/***/log4j-slf4j-impl-2.20.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]

I think it might be a problem that BIRT Runtime has integrated SLF4J code directly in its source code.
How can I resolve this?

[speckyspooky]

The issue is caused on the Cassandra-datasource - see #951

[speckyspooky]

The Cassandra Scripted Data Source incl. Hector-runtime is removed with PR #1419
and will be available with BIRT 4.14

With the removed jars and classes should be also solved the SLF4J-issue.