Concurrency problem with svn in jenkins

https://app.camunda.com/hudson/job/7.0_-_camunda-bpm_Integration_Webapps/

• When the cycle integrationtests are running at the same time in the matrix job there occur (sometimes) merge conflicts:

svn: CHECKOUT of '/sandbox2/!svn/ver/34887/': 409 Conflict (https://svn.camunda.com)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:64)
at org.tmatesoft.svn.core.internal.wc.SVNErrorManager.error(SVNErrorManager.java:51)
at org.tmatesoft.svn.core.wc.SVNCommitClient.doCommit(SVNCommitClient.java:899)
at org.tmatesoft.svn.core.wc.SVNCommitClient.doCommit(SVNCommitClient.java:828)
at org.tmatesoft.svn.core.javahl.SVNClientImpl.commit(SVNClientImpl.java:665)
at org.tmatesoft.svn.core.javahl.SVNClientImpl.commit(SVNClientImpl.java:648)
at org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.commit(AbstractJhlClientAdapter.java:319)
at org.tigris.subversion.svnclientadapter.javahl.AbstractJhlClientAdapter.commit(AbstractJhlClientAdapter.java:292)
at org.camunda.bpm.cycle.connector.svn.SvnConnector.commit(SvnConnector.java:375)
at org.camunda.bpm.cycle.connector.svn.SvnConnector.createNode(SvnConnector.java:269)
at org.camunda.bpm.cycle.test.TestCycleRoundtripIT.createConnectorNodeParentFolder(TestCycleRoundtripIT.java:227)
at org.camunda.bpm.cycle.test.TestCycleRoundtripIT.createRoundtripWithDetails(TestCycleRoundtripIT.java:200)
at org.camunda.bpm.cycle.test.TestCycleRoundtripIT.init(TestCycleRoundtripIT.java:110)