declare ： A is a trunk,B is an external.B contained in A.

①Checkout A except externals,and checkout B with previous version

②Checkout A with all externals,then get fail.

Got wrong with Using sole credentials <none> in realm ,but I did set the credentials,and others are check normaly.

Using sole credentials **/** in realm '<svn://**:3691> 172d0236-*-*****'
No changes for svn://**:3691/** since the previous build
No revision recorded for *** in the previous build
No revision recorded for svn://**:3693/** in the previous build
No revision recorded for *** in the previous build
Using sole credentials <none> in realm '<svn://**:3693> b91df76f-*-**'
org.tmatesoft.svn.core.SVNAuthenticationException: svn: E170001: Authentication required for 'b91df76f-**-**'
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:68)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:57)
at org.tmatesoft.svn.core.internal.io.svn.sasl.SVNSaslAuthenticator.createSaslClient(SVNSaslAuthenticator.java:318)
at org.tmatesoft.svn.core.internal.io.svn.sasl.SVNSaslAuthenticator.authenticate(SVNSaslAuthenticator.java:92)
at org.tmatesoft.svn.core.internal.io.svn.SVNConnection.authenticate(SVNConnection.java:198)
at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.authenticate(SVNRepositoryImpl.java:1296)
at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.openConnection(SVNRepositoryImpl.java:1274)
at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.getLatestRevision(SVNRepositoryImpl.java:172)
at org.tmatesoft.svn.core.internal.wc2.ng.SvnNgRepositoryAccess.getRevisionNumber(SvnNgRepositoryAccess.java:119)
at org.tmatesoft.svn.core.internal.wc2.SvnRepositoryAccess.getLocations(SvnRepositoryAccess.java:195)
at org.tmatesoft.svn.core.internal.wc2.ng.SvnNgRepositoryAccess.createRepositoryFor(SvnNgRepositoryAccess.java:46)
at org.tmatesoft.svn.core.internal.wc2.remote.SvnRemoteLog.run(SvnRemoteLog.java:160)
at org.tmatesoft.svn.core.internal.wc2.remote.SvnRemoteLog.run(SvnRemoteLog.java:35)
at org.tmatesoft.svn.core.internal.wc2.SvnOperationRunner.run(SvnOperationRunner.java:21)
at org.tmatesoft.svn.core.wc2.SvnOperationFactory.run(SvnOperationFactory.java:1235)
at org.tmatesoft.svn.core.wc2.SvnOperation.run(SvnOperation.java:294)
at org.tmatesoft.svn.core.wc.SVNLogClient.doLog(SVNLogClient.java:968)
at org.tmatesoft.svn.core.wc.SVNLogClient.doLog(SVNLogClient.java:873)
at hudson.scm.SubversionChangeLogBuilder.buildModule(SubversionChangeLogBuilder.java:194)
Caused: hudson.util.IOException2: revision check failed on svn://**:3693/**
at hudson.scm.SubversionChangeLogBuilder.buildModule(SubversionChangeLogBuilder.java:208)
at hudson.scm.SubversionChangeLogBuilder.run(SubversionChangeLogBuilder.java:138)
at hudson.scm.SubversionSCM.calcChangeLog(SubversionSCM.java:756)
at hudson.scm.SubversionSCM.checkout(SubversionSCM.java:891)
at hudson.scm.SCM.checkout(SCM.java:495)
at hudson.model.AbstractProject.checkout(AbstractProject.java:1212)
at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:566)
at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:491)
at hudson.model.Run.execute(Run.java:1737)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:421)
Finished: FAILURE