To test SB against Tomcat 8.0: git clone https: //github.com/spring-projects/spring-boot.git cd spring-boot git checkout v1.5.9.RELEASE mvn clean install -Dtomcat.version=8.0.36.redhat-24 ... Fails with ... [INFO] --- maven-compiler-plugin:3.1:compile ( default -compile) @ spring-boot --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 307 source files to /Users/chirino/sandbox/spring-boot/spring-boot/target/classes [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /Users/chirino/sandbox/spring-boot/spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactory.java:[59,34] cannot find symbol symbol: class SSLHostConfig location: package org.apache.tomcat.util.net [INFO] 1 error To test SB against Tomcat 9.0: git clone https: //github.com/spring-projects/spring-boot.git cd spring-boot git checkout v1.5.9.RELEASE mvn clean install -Dtomcat.version=9.0.6 ... Fails with ... [INFO] --- maven-compiler-plugin:3.1:compile ( default -compile) @ spring-boot --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 307 source files to /Users/chirino/sandbox/t/spring-boot/spring-boot/target/classes [INFO] ------------------------------------------------------------- [WARNING] COMPILATION WARNING : [INFO] ------------------------------------------------------------- [WARNING] /Users/chirino/sandbox/t/spring-boot/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java: /Users/chirino/sandbox/t/spring-boot/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java uses unchecked or unsafe operations. [WARNING] /Users/chirino/sandbox/t/spring-boot/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java: Recompile with -Xlint:unchecked for details. [INFO] 2 warnings [INFO] ------------------------------------------------------------- [INFO] ------------------------------------------------------------- [ERROR] COMPILATION ERROR : [INFO] ------------------------------------------------------------- [ERROR] /Users/chirino/sandbox/t/spring-boot/spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactory.java:[290,24] cannot find symbol symbol: method addServletMapping(java.lang. String ,java.lang. String ) location: variable context of type org.apache.catalina.Context [ERROR] /Users/chirino/sandbox/t/spring-boot/spring-boot/src/main/java/org/springframework/boot/context/embedded/tomcat/TomcatEmbeddedServletContainerFactory.java:[369,25] cannot find symbol symbol: method setCompressableMimeType(java.lang. String ) location: variable protocol of type org.apache.coyote.http11.AbstractHttp11Protocol<?> [INFO] 2 errors