When multiple builds are started at the same time, it sometimes happens that the p4tickets.txt file is locked, and the plugin gives up.

Could the plugin be adapted to wait a short time and try again?

I have the impression that there is a retry mechanism in p4java, but it appears not to be active.  (or does not work as expected)

This is the error :
 
 p4 login
 
 P4: Unable to setup workspace: com.perforce.p4java.exception.ConnectionException: com.perforce.p4java.exception.ConfigException: java.nio.file.FileSystemException: C:\Users\XXXXXXXX\p4tickets.txt.lck: The process cannot access the file because it is being used by another process.
 
     at com.perforce.p4java.impl.mapbased.rpc.packet.RpcPacketDispatcher.dispatch(RpcPacketDispatcher.java:225)
     at com.perforce.p4java.impl.mapbased.rpc.OneShotServerImpl.execMapCmdList(OneShotServerImpl.java:363)
     at com.perforce.p4java.impl.mapbased.rpc.OneShotServerImpl.execMapCmdList(OneShotServerImpl.java:203)
     at com.perforce.p4java.impl.mapbased.server.cmd.BaseDelegator.execMapCmdList(BaseDelegator.java:139)
     at com.perforce.p4java.impl.mapbased.server.cmd.LoginDelegator.login(LoginDelegator.java:131)
     at com.perforce.p4java.impl.mapbased.server.cmd.LoginDelegator.login(LoginDelegator.java:111)
     at com.perforce.p4java.impl.mapbased.server.cmd.LoginDelegator.login(LoginDelegator.java:85)
     at com.perforce.p4java.impl.mapbased.server.Server.login(Server.java:2422)
     at org.jenkinsci.plugins.p4.client.SessionHelper.login(SessionHelper.java:157)
     at org.jenkinsci.plugins.p4.client.ClientHelper.clientLogin(ClientHelper.java:129)
     at org.jenkinsci.plugins.p4.client.ClientHelper.<init>(ClientHelper.java:104)
     at org.jenkinsci.plugins.p4.tasks.AbstractTask.tryTask(AbstractTask.java:171)
     at org.jenkinsci.plugins.p4.tasks.CheckoutTask.invoke(CheckoutTask.java:165)
     at org.jenkinsci.plugins.p4.tasks.CheckoutTask.invoke(CheckoutTask.java:35)
     at hudson.FilePath$FileCallableWrapper.call(FilePath.java:3492)
     at hudson.remoting.UserRequest.perform(UserRequest.java:211)
     at hudson.remoting.UserRequest.perform(UserRequest.java:54)
     at hudson.remoting.Request$2.run(Request.java:376)
     at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78)
     at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
     at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
     at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
     at hudson.remoting.Engine$1.lambda$newThread$0(Engine.java:121)
     at java.base/java.lang.Thread.run(Thread.java:829)
 Caused by: com.perforce.p4java.exception.ConnectionException: com.perforce.p4java.exception.ConfigException: java.nio.file.FileSystemException: C:\Users\XXXXXXXX\p4tickets.txt.lck: The process cannot access the file because it is being used by another process.
 
     at com.perforce.p4java.impl.mapbased.rpc.func.client.ClientUserInteraction.clientSetPassword(ClientUserInteraction.java:383)
     at com.perforce.p4java.impl.mapbased.rpc.func.client.ClientFunctionDispatcher.dispatch(ClientFunctionDispatcher.java:193)
     at com.perforce.p4java.impl.mapbased.rpc.packet.RpcPacketDispatcher.dispatch(RpcPacketDispatcher.java:160)
     ... 23 more
 Caused by: com.perforce.p4java.exception.ConfigException: java.nio.file.FileSystemException: C:\Users\XXXXXXXX\p4tickets.txt.lck: The process cannot access the file because it is being used by another process.
 
     at com.perforce.p4java.impl.mapbased.rpc.RpcServer.quietSaveTicket(RpcServer.java:1540)
     at com.perforce.p4java.impl.mapbased.rpc.RpcServer.saveTicket(RpcServer.java:1495)
     at com.perforce.p4java.impl.mapbased.rpc.func.client.ClientUserInteraction.clientSetPassword(ClientUserInteraction.java:381)
     ... 25 more
 Caused by: java.nio.file.FileSystemException: C:\Users\XXXXXXXX\p4tickets.txt.lck: The process cannot access the file because it is being used by another process.
 
     at java.base/sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:92)
     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:103)
     at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:108)
     at java.base/sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:274)
     at java.base/sun.nio.fs.AbstractFileSystemProvider.deleteIfExists(AbstractFileSystemProvider.java:110)
     at java.base/java.nio.file.Files.deleteIfExists(Files.java:1181)
     at com.perforce.p4java.server.AbstractAuthHelper.saveFileEntry(AbstractAuthHelper.java:225)
     at com.perforce.p4java.server.AuthTicketsHelper.saveTicket(AuthTicketsHelper.java:284)
     at com.perforce.p4java.server.AuthTicketsHelper.saveTicket(AuthTicketsHelper.java:248)
     at com.perforce.p4java.impl.mapbased.rpc.RpcServer.quietSaveTicket(RpcServer.java:1533)
     ... 27 more
 
 ERROR: P4: Task Exception: com.perforce.p4java.exception.ConfigException: java.nio.file.FileSystemException: C:\Users\XXXXXXXX\p4tickets.txt.lck: The process cannot access the file because it is being used by another process.