fix: add logging to integration tests

build.gradle.kts

@@ -118,7 +118,7 @@ publishing {
 }
 
 val kafkaVersion = "2.2.0"
-val slf4jVersion = "1.7.36"
+val slf4jVersion = "2.0.13"
 
 val avroVersion = "1.8.1"
 // Version 1.8.1 brings Jackson 1.9.x/org.codehaus.jackson package for Avro and Confluent Platform 4.1.4.
@@ -190,6 +190,7 @@ dependencies {
     integrationTestRuntimeOnly("io.confluent:kafka-avro-serializer:$confluentPlatformVersion")
     integrationTestRuntimeOnly("io.confluent:kafka-connect-avro-converter:$confluentPlatformVersion")
     integrationTestRuntimeOnly("io.confluent:kafka-json-serializer:$confluentPlatformVersion")
+    integrationTestRuntimeOnly("org.slf4j:slf4j-log4j12:$slf4jVersion")
 
     integrationTestImplementation("org.apache.kafka:connect-runtime:$kafkaVersion")
     integrationTestImplementation("com.fasterxml.jackson.core:jackson-annotations:$jacksonVersion")

src/integrationTest/resources/log4j.properties

@@ -0,0 +1,20 @@
+##
+# Copyright 2024 Aiven Oy
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+##
+log4j.rootLogger=INFO, stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=[%d] %C %p %m (%c:%L)%n
+log4j.logger.org.apache.kafka=ERROR