java.lang.Error: Failed to write data: Socket closed
at compiler.compilercontrol.share.scenario.Executor.connectTestVM(Executor.java:147)
at compiler.compilercontrol.share.scenario.Executor.lambda$execute$0(Executor.java:98)
at java.lang.Thread.run(java.base@9-internal/Thread.java:843)
Caused by: java.net.SocketException: Socket closed
at java.net.PlainSocketImpl.socketAccept(java.base@9-internal/Native Method)
at java.net.AbstractPlainSocketImpl.accept(java.base@9-internal/AbstractPlainSocketImpl.java:459)
at java.net.ServerSocket.implAccept(java.base@9-internal/ServerSocket.java:551)
at java.net.ServerSocket.accept(java.base@9-internal/ServerSocket.java:519)
at compiler.compilercontrol.share.scenario.Executor.connectTestVM(Executor.java:126)
happened again in test execution.

There are no obvious reason of these failures. It's possible that the test VM haven't started or exited with 0 exitcode before the connection. Such behaviour should not have been caused by the test itself. But test doesn't give enough information about.