# What is your tech stack?
Spring Bootspringboot.pnghttps://spring.io/projects/spring-boot
Apache Lucenelucene.pnghttps://lucene.apache.org/
Apache Commonsapache commons.pnghttps://commons.apache.org/
Apache POIapache poi.pnghttps://poi.apache.org/
Caffeine Cachegit.pnghttps://github.com/ben-manes/caffeine
XGBoost4jxgboost.pnghttps://xgboost.readthedocs.io/en/stable/jvm/index.html
MongoDBmongodb.pnghttps://www.mongodb.com/
Apache Kafkakafka.pnghttps://kafka.apache.org/
Dockerdocker.pnghttps://www.docker.com/
Prowide Coreprowide.pnghttps://www.prowidesoftware.com/
Apache ActiveMQactivemq.pnghttps://activemq.apache.org/
Apache Mavenmaven.pnghttps://maven.apache.org/
Apache PDFBoxpdfbox.pnghttps://pdfbox.apache.org/
jsoupjsoup.pnghttps://jsoup.org/
JDKjdk.pnghttps://jdk.java.net/