See 
<https://builds.apache.org/job/PDFBox-trunk/org.apache.pdfbox$preflight/3092/>

------------------------------------------
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Apache Preflight 2.1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
Downloading: 
http://repo.maven.apache.org/maven2/com/googlecode/maven-download-plugin/download-maven-plugin/1.3.0/download-maven-plugin-1.3.0.pom
Downloaded: 
http://repo.maven.apache.org/maven2/com/googlecode/maven-download-plugin/download-maven-plugin/1.3.0/download-maven-plugin-1.3.0.pom
 (10 KB at 1040.8 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/sonatype/oss/oss-parent/9/oss-parent-9.pom
 (7 KB at 712.8 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/com/googlecode/maven-download-plugin/download-maven-plugin/1.3.0/download-maven-plugin-1.3.0.jar
Downloaded: 
http://repo.maven.apache.org/maven2/com/googlecode/maven-download-plugin/download-maven-plugin/1.3.0/download-maven-plugin-1.3.0.jar
 (32 KB at 3456.9 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/log4j/log4j/1.2.17/log4j-1.2.17.pom
Downloaded: 
http://repo.maven.apache.org/maven2/log4j/log4j/1.2.17/log4j-1.2.17.pom (22 KB 
at 2123.5 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/log4j/log4j/1.2.17/log4j-1.2.17.jar
Downloaded: 
http://repo.maven.apache.org/maven2/log4j/log4j/1.2.17/log4j-1.2.17.jar (479 KB 
at 25179.1 KB/sec)
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ preflight ---
[TASKS] Scanning folder 
'<https://builds.apache.org/job/PDFBox-trunk/org.apache.pdfbox$preflight/ws/'> 
for files matching the pattern '**/*.java' - excludes: 
[TASKS] Found 135 files to scan for tasks
Found 18 open tasks.
[TASKS] Computing warning deltas based on reference build #3086
[INFO] 
[INFO] --- maven-remote-resources-plugin:1.5:process (default) @ preflight ---
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ preflight 
---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] Copying 3 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ preflight ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 111 source files to 
<https://builds.apache.org/job/PDFBox-trunk/org.apache.pdfbox$preflight/ws/target/classes>
[WARNING] bootstrap class path not set in conjunction with -source 1.6
[WARNING] 
<https://builds.apache.org/job/PDFBox-trunk/org.apache.pdfbox$preflight/ws/src/main/java/org/apache/pdfbox/preflight/font/descriptor/FontDescriptorHelper.java>:
 Some input files use unchecked or unsafe operations.
[WARNING] 
<https://builds.apache.org/job/PDFBox-trunk/org.apache.pdfbox$preflight/ws/src/main/java/org/apache/pdfbox/preflight/font/descriptor/FontDescriptorHelper.java>:
 Recompile with -Xlint:unchecked for details.
[INFO] 
[INFO] --- download-maven-plugin:1.3.0:wget (get-isartor) @ preflight ---
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient/4.0-beta2/httpclient-4.0-beta2.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient/4.0-beta2/httpclient-4.0-beta2.pom
 (5 KB at 494.4 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcomponents-client/4.0-beta2/httpcomponents-client-4.0-beta2.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcomponents-client/4.0-beta2/httpcomponents-client-4.0-beta2.pom
 (8 KB at 961.3 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcore/4.0-beta3/httpcore-4.0-beta3.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcore/4.0-beta3/httpcore-4.0-beta3.pom
 (5 KB at 577.3 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcomponents-core/4.0-beta3/httpcomponents-core-4.0-beta3.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcomponents-core/4.0-beta3/httpcomponents-core-4.0-beta3.pom
 (7 KB at 965.8 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/3.0.1/plexus-archiver-3.0.1.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/3.0.1/plexus-archiver-3.0.1.pom
 (6 KB at 706.3 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.6/plexus-io-2.6.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.6/plexus-io-2.6.pom
 (4 KB at 550.8 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/iq80/snappy/snappy/0.3/snappy-0.3.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/iq80/snappy/snappy/0.3/snappy-0.3.pom 
(15 KB at 1562.7 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.4/plexus-utils-1.5.4.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.4/plexus-utils-1.5.4.pom
 (6 KB at 558.5 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/2.5/wagon-provider-api-2.5.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon-provider-api/2.5/wagon-provider-api-2.5.pom
 (2 KB at 210.7 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon/2.5/wagon-2.5.pom
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/maven/wagon/wagon/2.5/wagon-2.5.pom
 (20 KB at 2446.9 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-api/2.0/maven-reporting-api-2.0.jar
Downloading: 
http://repo.maven.apache.org/maven2/doxia/doxia-sink-api/1.0-alpha-4/doxia-sink-api-1.0-alpha-4.jar
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient/4.0-beta2/httpclient-4.0-beta2.jar
Downloading: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcore/4.0-beta3/httpcore-4.0-beta3.jar
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/3.0.1/plexus-archiver-3.0.1.jar
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/maven/reporting/maven-reporting-api/2.0/maven-reporting-api-2.0.jar
 (7 KB at 641.5 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.6/plexus-io-2.6.jar
Downloaded: 
http://repo.maven.apache.org/maven2/doxia/doxia-sink-api/1.0-alpha-4/doxia-sink-api-1.0-alpha-4.jar
 (5 KB at 298.5 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/iq80/snappy/snappy/0.3/snappy-0.3.jar
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-io/2.6/plexus-io-2.6.jar
 (83 KB at 3734.3 KB/sec)
Downloading: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.4/plexus-utils-1.5.4.jar
Downloaded: 
http://repo.maven.apache.org/maven2/org/iq80/snappy/snappy/0.3/snappy-0.3.jar 
(48 KB at 5952.6 KB/sec)
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpclient/4.0-beta2/httpclient-4.0-beta2.jar
 (270 KB at 7098.4 KB/sec)
Downloaded: 
http://repo.maven.apache.org/maven2/org/apache/httpcomponents/httpcore/4.0-beta3/httpcore-4.0-beta3.jar
 (169 KB at 3822.4 KB/sec)
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-archiver/3.0.1/plexus-archiver-3.0.1.jar
 (373 KB at 8266.7 KB/sec)
Downloaded: 
http://repo.maven.apache.org/maven2/org/codehaus/plexus/plexus-utils/1.5.4/plexus-utils-1.5.4.jar
 (245 KB at 9771.9 KB/sec)
[WARNING] Could not get content
org.apache.maven.wagon.TransferFailedException: 
sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find 
valid certification path to requested target
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:799)
        at 
org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116)
        at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
        at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
        at 
com.googlecode.download.maven.plugin.internal.WGet.doGet(WGet.java:377)
        at 
com.googlecode.download.maven.plugin.internal.WGet.execute(WGet.java:282)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at 
org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:117)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
        at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:181)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:136)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:71)
        at hudson.remoting.UserRequest.perform(UserRequest.java:153)
        at hudson.remoting.UserRequest.perform(UserRequest.java:50)
        at hudson.remoting.Request$2.run(Request.java:332)
        at 
hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        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:1904)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:279)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:273)
        at 
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1446)
        at 
sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:209)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:901)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:837)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1023)
        at 
sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)
        at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:709)
        at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:122)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionOutputBuffer.flushBuffer(AbstractSessionOutputBuffer.java:131)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionOutputBuffer.flush(AbstractSessionOutputBuffer.java:138)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.AbstractHttpClientConnection.doFlush(AbstractHttpClientConnection.java:270)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.AbstractHttpClientConnection.flush(AbstractHttpClientConnection.java:275)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.conn.AbstractClientConnAdapter.flush(AbstractClientConnAdapter.java:197)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.doSendRequest(HttpRequestExecutor.java:258)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:645)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:464)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:674)
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:793)
        ... 37 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:385)
        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:326)
        at 
sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
        at 
sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:107)
        at 
org.apache.maven.wagon.shared.http4.EasyX509TrustManager.checkServerTrusted(EasyX509TrustManager.java:118)
        at 
sun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:885)
        at 
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1428)
        ... 57 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable 
to find valid certification path to requested target
        at 
sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
        at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
        ... 65 more
[WARNING] Retrying (1 more)
[WARNING] Could not get content
org.apache.maven.wagon.TransferFailedException: 
sun.security.validator.ValidatorException: PKIX path building failed: 
sun.security.provider.certpath.SunCertPathBuilderException: unable to find 
valid certification path to requested target
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:799)
        at 
org.apache.maven.wagon.StreamWagon.getInputStream(StreamWagon.java:116)
        at org.apache.maven.wagon.StreamWagon.getIfNewer(StreamWagon.java:88)
        at org.apache.maven.wagon.StreamWagon.get(StreamWagon.java:61)
        at 
com.googlecode.download.maven.plugin.internal.WGet.doGet(WGet.java:377)
        at 
com.googlecode.download.maven.plugin.internal.WGet.execute(WGet.java:282)
        at 
org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
        at 
org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
        at 
org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
        at 
org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
        at 
org.jvnet.hudson.maven3.launcher.Maven3Launcher.main(Maven3Launcher.java:117)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:329)
        at 
org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:239)
        at org.jvnet.hudson.maven3.agent.Maven3Main.launch(Maven3Main.java:181)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:136)
        at hudson.maven.Maven3Builder.call(Maven3Builder.java:71)
        at hudson.remoting.UserRequest.perform(UserRequest.java:153)
        at hudson.remoting.UserRequest.perform(UserRequest.java:50)
        at hudson.remoting.Request$2.run(Request.java:332)
        at 
hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:68)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        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:1904)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:279)
        at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:273)
        at 
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1446)
        at 
sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:209)
        at sun.security.ssl.Handshaker.processLoop(Handshaker.java:901)
        at sun.security.ssl.Handshaker.process_record(Handshaker.java:837)
        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1023)
        at 
sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)
        at sun.security.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:709)
        at sun.security.ssl.AppOutputStream.write(AppOutputStream.java:122)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionOutputBuffer.flushBuffer(AbstractSessionOutputBuffer.java:131)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.io.AbstractSessionOutputBuffer.flush(AbstractSessionOutputBuffer.java:138)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.AbstractHttpClientConnection.doFlush(AbstractHttpClientConnection.java:270)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.AbstractHttpClientConnection.flush(AbstractHttpClientConnection.java:275)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.conn.AbstractClientConnAdapter.flush(AbstractClientConnAdapter.java:197)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.doSendRequest(HttpRequestExecutor.java:258)
        at 
org.apache.maven.wagon.providers.http.httpclient.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:123)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.tryExecute(DefaultRequestDirector.java:645)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:464)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
        at 
org.apache.maven.wagon.providers.http.httpclient.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754)
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.execute(AbstractHttpClientWagon.java:674)
        at 
org.apache.maven.wagon.shared.http4.AbstractHttpClientWagon.fillInputData(AbstractHttpClientWagon.java:793)
        ... 37 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:385)
        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:326)
        at 
sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:231)
        at 
sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:107)
        at 
org.apache.maven.wagon.shared.http4.EasyX509TrustManager.checkServerTrusted(EasyX509TrustManager.java:118)
        at 
sun.security.ssl.AbstractTrustManagerWrapper.checkServerTrusted(SSLContextImpl.java:885)
        at 
sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1428)
        ... 57 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable 
to find valid certification path to requested target
        at 
sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:196)
        at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:268)
        at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:380)
        ... 65 more

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