Integrating Jira with Confluence through application link but unable to create.

[Ramakrishna kommineni]

I am trying to integrate Jira (V7.1.8) with confluence (6.4.3) through Application links but getting error as below in Jira UI.

No response was received from the URL you entered - it may not be valid. Please fix the URL below, if needed, and click Continue

Also see below errors in Jira server logs.

2019-02-14 11:05:06,152 http-nio-8080-exec-151 ERROR xxxxxx 665x4960444x1 khualx 10.67.200.249 /rest/applinks/3.0/applicationlinkForm/manifest.json [c.a.a.c.rest.ui.CreateApplicationLinkUIResource] ManifestNotFoundException thrown while retrieving manifest
com.atlassian.applinks.spi.manifest.ManifestNotFoundException: 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 com.atlassian.applinks.core.manifest.AppLinksManifestDownloader.doDownload(AppLinksManifestDownloader.java:236)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader.access$000(AppLinksManifestDownloader.java:50)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader$1$1.<init>(AppLinksManifestDownloader.java:139)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader$1.load(AppLinksManifestDownloader.java:132)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader$1.load(AppLinksManifestDownloader.java:128)
 at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3527)
 at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2319)
 at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2282)
 at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2197)
 at com.google.common.cache.LocalCache.get(LocalCache.java:3937)
 at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3941)
 at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4824)
 at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4830)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader.downloadInternal(AppLinksManifestDownloader.java:110)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader.download(AppLinksManifestDownloader.java:87)
 at com.atlassian.applinks.core.manifest.ManifestRetrieverDispatcher.getManifest(ManifestRetrieverDispatcher.java:46)
 at com.atlassian.applinks.core.rest.ui.CreateApplicationLinkUIResource.tryToFetchManifest(CreateApplicationLinkUIResource.java:145)
 ... 2 filtered
 at java.lang.reflect.Method.invoke(Method.java:498)
 ... 3 filtered
 at com.atlassian.applinks.internal.rest.interceptor.NoCacheHeaderInterceptor.intercept(NoCacheHeaderInterceptor.java:15)
 ... 1 filtered
 at com.atlassian.applinks.core.rest.auth.AdminApplicationLinksInterceptor.intercept(AdminApplicationLinksInterceptor.java:39)
 ... 1 filtered
 at com.atlassian.applinks.core.rest.context.ContextInterceptor.intercept(ContextInterceptor.java:19)
 ... 15 filtered
 at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:154)
 ... 1 filtered
 at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:68)
 ... 32 filtered
 at com.atlassian.applinks.cors.rest.CorsFilter.doFilter(CorsFilter.java:112)
 ... 57 filtered
 at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:70)
 ... 16 filtered
 at com.atlassian.plugins.rest.module.servlet.RestSeraphFilter.doFilter(RestSeraphFilter.java:37)
 ... 73 filtered
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 at java.lang.Thread.run(Thread.java:745)
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(Alerts.java:192)
 at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1949)
 at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:302)
 at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:296)
 at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1509)
 at sun.security.ssl.Handshaker.processLoop(Handshaker.java:979)
 at sun.security.ssl.Handshaker.process_record(Handshaker.java:914)
 at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1062)
 at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)
 at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)
 at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)
 at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory.java:394)
 at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:353)
 at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:134)
 at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:353)
 at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:380)
 at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)
 at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
 at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
 at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
 at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
 at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
 at com.atlassian.sal.core.net.HttpClientRequest.executeAndReturn(HttpClientRequest.java:109)
 at com.atlassian.plugins.rest.module.jersey.JerseyRequest.executeAndReturn(JerseyRequest.java:131)
 at com.atlassian.plugins.rest.module.jersey.JerseyRequest.execute(JerseyRequest.java:113)
 at com.atlassian.applinks.core.manifest.AppLinksManifestDownloader.doDownload(AppLinksManifestDownloader.java:181)
 ... 230 more
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(PKIXValidator.java:387)
 at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:292)
 at sun.security.validator.Validator.validate(Validator.java:260)
 at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:324)
 at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:229)
 at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1491)
 ... 252 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
 at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
 at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
 at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
 at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:382)
 ... 258 more

[Nic Brough -Adaptavist-]

Your Jira is using SSL, but your Confluence does not have the certificates it needs to talk to Jira over SSL.

Your Jira (or the proxy in front of it handling SSL for it) can provide the right one (you can save it from the browser), then you'll need to get it installed in the Confluence's Tomcat.