Respected @wilkinsona, It was great to work with the Springboot framework with Okta SSO integration but faced some issues in it. As I created a keystore.jks file and configured it in the application. properties file and followed the issue in which you mention the solution. I tried with all of them still not working. Please help me out.

[https://github.com/spring-projects/spring-boot/issues/9089] 1) tried changing the path of keystore.jks file 2) keystore.jks was generated with the same java 1.8 version and used in the same java version. keytool -genkey -v -keystore keystore.jks -alias spring -keyalg RSA -keysize 2048 -validity 10000 3) given the path of keystore.jks file from src/main/resources

Any leads will be appreciated. Thanks in advance

please check the configuration 

server.port = 8443
server.ssl.enabled = true
server.ssl.key-alias = spring
server.ssl.key-store = keystore.jks
server.ssl.key-store-password = nikhil

security.saml2.metadata-url = https://dev-12727091.okta.com/app/exk2ahq9olbjVoMmW5d7/sso/saml/metadata

org.springframework.context.ApplicationContextException: Failed to start bean 'webServerStartStop'; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:181) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:54) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:356) ~[spring-context-5.3.10.jar:5.3.10]
    at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[na:na]
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:155) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:123) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:935) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:586) ~[spring-context-5.3.10.jar:5.3.10]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) ~[spring-boot-2.5.5.jar:2.5.5]
    at com.main.OktaSsoDemoApplication.main(OktaSsoDemoApplication.java:10) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.5.5.jar:2.5.5]
Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat server
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:229) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:43) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:178) ~[spring-context-5.3.10.jar:5.3.10]
    ... 19 common frames omitted
Caused by: java.lang.IllegalArgumentException: standardService.connector.startFailed
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:238) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:282) ~[spring-boot-2.5.5.jar:2.5.5]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:213) ~[spring-boot-2.5.5.jar:2.5.5]
    ... 21 common frames omitted
Caused by: org.apache.catalina.LifecycleException: Protocol handler start failed
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1075) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.catalina.core.StandardService.addConnector(StandardService.java:234) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    ... 23 common frames omitted
Caused by: java.lang.IllegalArgumentException: C:\Users\Admin\Desktop\Office_work\mediorbis_springboot_workspace\okta-sso-demo\keystore.jks (The system cannot find the file specified)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:99) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.initialiseSsl(AbstractJsseEndpoint.java:71) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:231) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.AbstractEndpoint.bindWithCleanup(AbstractEndpoint.java:1208) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.AbstractEndpoint.start(AbstractEndpoint.java:1294) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.coyote.AbstractProtocol.start(AbstractProtocol.java:614) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.catalina.connector.Connector.startInternal(Connector.java:1072) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    ... 25 common frames omitted
Caused by: java.io.FileNotFoundException: C:\Users\Admin\Desktop\Office_work\mediorbis_springboot_workspace\okta-sso-demo\keystore.jks (The system cannot find the file specified)
    at java.base/java.io.FileInputStream.open0(Native Method) ~[na:na]
    at java.base/java.io.FileInputStream.open(FileInputStream.java:219) ~[na:na]
    at java.base/java.io.FileInputStream.<init>(FileInputStream.java:157) ~[na:na]
    at java.base/java.io.FileInputStream.<init>(FileInputStream.java:112) ~[na:na]
    at java.base/sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:86) ~[na:na]
    at java.base/sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:184) ~[na:na]
    at org.apache.catalina.startup.CatalinaBaseConfigurationSource.getResource(CatalinaBaseConfigurationSource.java:118) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.SSLUtilBase.getStore(SSLUtilBase.java:197) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.SSLHostConfigCertificate.getCertificateKeystore(SSLHostConfigCertificate.java:207) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.SSLUtilBase.getKeyManagers(SSLUtilBase.java:281) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.SSLUtilBase.createSSLContext(SSLUtilBase.java:245) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:97) ~[tomcat-embed-core-9.0.53.jar:9.0.53]
    ... 31 common frames omitted

Comment From: wilkinsona

You have configured your application to look for the keystore.jks file at C:\Users\Admin\Desktop\Office_work\mediorbis_springboot_workspace\okta-sso-demo\keystore.jks but it's not there. You either need to correct your configuration or copy the file to the expected location.

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