Bamboo frequently reports the error "Failed to get the build source code" after being triggered by a SVN commit. The apparent cause from the stack trace is that the connection to Subversion has been reset. This causes Bamboo to execute a clean operation followed by an update which then succeeds. Several other build systems tested in this same environment against the same repository do not exhibit similar issues.

com.atlassian.bamboo.repository.RepositoryException: Meritas Continuous - SERVER
at com.atlassian.bamboo.repository.svn.SvnRepository.getChangesSinceLastBuild(SvnRepository.java:376)
at com.atlassian.bamboo.build.strategy.PollingBuildStrategy.requiresBuild(PollingBuildStrategy.java:126)
at com.atlassian.bamboo.build.DefaultBuildChangeDetector.checkIfBuildNeedsBuilding(DefaultBuildChangeDetector.java:166)
at com.atlassian.bamboo.build.DefaultBuildChangeDetector.doTask(DefaultBuildChangeDetector.java:114)
at com.atlassian.bamboo.build.DefaultBuildChangeDetector.run(DefaultBuildChangeDetector.java:77)
at edu.emory.mathcs.backport.java.util.concurrent.helpers.ThreadHelpers$1.run(ThreadHelpers.java:34)
at java.lang.Thread.run(Thread.java:595)
Caused by: org.tmatesoft.svn.core.SVNException: svn: Connection reset
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:48)
at org.tmatesoft.svn.core.internal.io.svn.SVNReader.parse(SVNReader.java:360)
at org.tmatesoft.svn.core.internal.io.svn.SVNConnection.read(SVNConnection.java:206)
at org.tmatesoft.svn.core.internal.io.svn.SVNConnection.authenticate(SVNConnection.java:92)
at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.authenticate(SVNRepositoryImpl.java:983)
at org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.update(SVNRepositoryImpl.java:565)
at org.tmatesoft.svn.core.wc.SVNUpdateClient.doUpdate(SVNUpdateClient.java:162)
at com.atlassian.bamboo.repository.svn.SvnRepository.update(SvnRepository.java:713)
at com.atlassian.bamboo.repository.svn.SvnRepository.getChangesSinceLastBuild(SvnRepository.java:353)