How to use S2I for springboot application + gradle

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I am trying to build and deploy a simple spring boot appusing openshift S2I. It uses gradle. Below is the link to repo. https://github.com/am7ey/student-spring-boot. Error details are as follows . Can someone share the guide lines for deploying springboot application using S2I.

I am getting following erroe when .class or .jar file is not checked in.

Starting the Java application using /opt/run-java/run-java.sh ...
ERROR: Neither $JAVA_MAIN_CLASS nor $JAVA_APP_JAR is set and 0 JARs found in /deployments (1 expected)
exec java -javaagent:/opt/jolokia/jolokia.jar=config=/opt/jolokia/etc/jolokia.properties -Xms256m -Xmx256m -XX:+UseParallelGC -XX:MinHeapFreeRatio=20 -XX:MaxHeapFreeRatio=40 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MaxMetaspaceSize=100m -XX:ParallelGCThreads=1 -Djava.util.concurrent.ForkJoinPool.common.parallelism=1 -XX:CICompilerCount=2 -XX:+ExitOnOutOfMemoryError -cp . -jar

After adding .jar file following error.

Starting the Java application using /opt/jboss/container/java/run/run-java.sh ...
INFO exec java -javaagent:/opt/jboss/container/jolokia/jolokia.jar=config=/opt/jboss/container/jolokia/etc/jolokia.properties -XX:+UseParallelOldGC -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:MaxMetaspaceSize=100m -XX:+ExitOnOutOfMemoryError -cp ".:/deployments/*" StudentApplication.class
E

AG

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