Spring Boot App running on SSL throws javax.net.ssl.SSLHandshakeException:
<p>I have a spring boot project implemented with CAS and running on SSL. In the port 8443 I am running the spring boot application and on port 9443 the cas server is located. I have completely working project. I wanted to keep it as a back up and continue development in another copy of the same project. But when I copy the project from this source to another workspace in STS and run the application the following exception is thrown. I didn't change any of the code or anything, just copied the working project to another directory and then I imported it to a different workspace in another STS instance (started another STS IDE). That's all I did and here is the exception.</p>

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<pre class="snippet-code-html lang-html prettyprint-override"><code>javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.ssl.Alerts.getSSLException(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
 at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
 at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
 at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
 at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
 at sun.security.ssl.Handshaker.processLoop(Unknown Source)
 at sun.security.ssl.Handshaker.process_record(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
 at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
 at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
 at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
 at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
 at org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
 at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
 at org.springframework.security.cas.authentication.CasAuthenticationProvider.authenticateNow(CasAuthenticationProvider.java:140)
 at org.springframework.security.cas.authentication.CasAuthenticationProvider.authenticate(CasAuthenticationProvider.java:126)
 at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:156)
 at org.springframework.security.cas.web.CasAuthenticationFilter.attemptAuthentication(CasAuthenticationFilter.java:242)
 at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:211)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.esco.demo.ssc.web.filter.CsrfCookieGeneratorFilter.doFilterInternal(CsrfCookieGeneratorFilter.java:34)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:85)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
 at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:100)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
 at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Unknown Source)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
 at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
 at sun.security.validator.Validator.validate(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
 ... 71 common frames omitted
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
 at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
 at java.security.cert.CertPathBuilder.build(Unknown Source)
 ... 77 common frames omitted

2016-03-30 12:03:42.528 ERROR 2596 --- [0.1-8443-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception

java.lang.RuntimeException: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:407)
 at org.jasig.cas.client.validation.AbstractCasProtocolUrlBasedTicketValidator.retrieveResponseFromServer(AbstractCasProtocolUrlBasedTicketValidator.java:45)
 at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java:200)
 at org.springframework.security.cas.authentication.CasAuthenticationProvider.authenticateNow(CasAuthenticationProvider.java:140)
 at org.springframework.security.cas.authentication.CasAuthenticationProvider.authenticate(CasAuthenticationProvider.java:126)
 at org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:156)
 at org.springframework.security.cas.web.CasAuthenticationFilter.attemptAuthentication(CasAuthenticationFilter.java:242)
 at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:211)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:100)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.esco.demo.ssc.web.filter.CsrfCookieGeneratorFilter.doFilterInternal(CsrfCookieGeneratorFilter.java:34)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:85)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
 at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
 at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:100)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.springframework.boot.actuate.autoconfigure.MetricFilterAutoConfiguration$MetricsFilter.doFilterInternal(MetricFilterAutoConfiguration.java:90)
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
 at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Unknown Source)
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.ssl.Alerts.getSSLException(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.fatal(Unknown Source)
 at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
 at sun.security.ssl.Handshaker.fatalSE(Unknown Source)
 at sun.security.ssl.ClientHandshaker.serverCertificate(Unknown Source)
 at sun.security.ssl.ClientHandshaker.processMessage(Unknown Source)
 at sun.security.ssl.Handshaker.processLoop(Unknown Source)
 at sun.security.ssl.Handshaker.process_record(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
 at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
 at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
 at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
 at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
 at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
 at org.jasig.cas.client.util.CommonUtils.getResponseFromServer(CommonUtils.java:393)
 ... 57 common frames omitted
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
 at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
 at sun.security.validator.Validator.validate(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.validate(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.checkTrusted(Unknown Source)
 at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
 ... 71 common frames omitted
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
 at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
 at java.security.cert.CertPathBuilder.build(Unknown Source)
 ... 77 common frames omitted</code></pre>
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</p>

<p>I know the reason to this exception, and I have already fixed it months ago when I was developing apps to work on SSL. Same project working in one workspace and a similar copy doesn't work in another workspace. I cannot understand any reason for the issue? Please help me if anyone have any idea about this issue. </p>