ErrorAction.findOrigin failures due to ProxyException

[jglick]

A test case that passes on Java 11 but fails on 17; fix inspired by #327.

…
FINE	o.j.p.w.actions.ErrorAction#<init>: unable to serialize to XML
java.lang.reflect.InaccessibleObjectException: Unable to make field private static final long java.nio.channels.ClosedChannelException.serialVersionUID accessible: module java.base does not "opens java.nio.channels" to unnamed module @7c9d8e2
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
	at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
	at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
	at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildDictionaryEntryForClass(FieldDictionary.java:176)
	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:142)
	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldsFor(FieldDictionary.java:80)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:167)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:206)
…
Caused: java.lang.RuntimeException: Failed to serialize java.lang.Throwable#cause for class hudson.remoting.RequestAbortedException
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:274)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:241)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:174)
…
[test0 #1] ERROR: Original failure:
[test0 #1] java.nio.channels.ClosedChannelException
[test0 #1] Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from localhost/127.0.0.1:55506
[test0 #1] 		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1787)
[test0 #1] 		at hudson.remoting.Request.call(Request.java:199)
[test0 #1] 		at hudson.remoting.Channel.call(Channel.java:1002)
[test0 #1] 		at hudson.FilePath.act(FilePath.java:1230)
[test0 #1] 		at hudson.FilePath.act(FilePath.java:1219)
[test0 #1] 		at org.jenkinsci.plugins.workflow.actions.ErrorActionTest$FailingStep.lambda$start$0(ErrorActionTest.java:316)
[test0 #1] 		at org.jenkinsci.plugins.workflow.steps.StepExecutions$SynchronousBodyVoid.lambda$asReturn$0(StepExecutions.java:45)
[test0 #1] 		at org.jenkinsci.plugins.workflow.steps.StepExecutions$SynchronousNonBlockingImpl.run(StepExecutions.java:99)
[test0 #1] 		at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
[test0 #1] 		at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
[test0 #1] 		at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[test0 #1] Caused: hudson.remoting.RequestAbortedException
[test0 #1] 	at hudson.remoting.Request.abort(Request.java:346)
[test0 #1] 	at hudson.remoting.Channel.terminate(Channel.java:1083)
[test0 #1] 	at org.jenkinsci.remoting.protocol.impl.ChannelApplicationLayer.onReadClosed(ChannelApplicationLayer.java:241)
[test0 #1] 	at org.jenkinsci.remoting.protocol.ApplicationLayer.onRecvClosed(ApplicationLayer.java:221)
[test0 #1] 	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:825)
[test0 #1] 	at org.jenkinsci.remoting.protocol.FilterLayer.onRecvClosed(FilterLayer.java:289)
[test0 #1] 	at org.jenkinsci.remoting.protocol.impl.SSLEngineFilterLayer.onRecvClosed(SSLEngineFilterLayer.java:168)
[test0 #1] 	at org.jenkinsci.remoting.protocol.ProtocolStack$Ptr.onRecvClosed(ProtocolStack.java:825)
[test0 #1] 	at org.jenkinsci.remoting.protocol.NetworkLayer.onRecvClosed(NetworkLayer.java:155)
[test0 #1] 	at org.jenkinsci.remoting.protocol.impl.NIONetworkLayer.ready(NIONetworkLayer.java:143)
[test0 #1] 	at org.jenkinsci.remoting.protocol.IOHub$OnReady.run(IOHub.java:789)
[test0 #1] 	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
[test0 #1] 	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
[test0 #1] 	at jenkins.util.ErrorLoggingExecutorService.lambda$wrap$0(ErrorLoggingExecutorService.java:51)
[test0 #1] 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
[test0 #1] 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
[test0 #1] 	at java.base/java.lang.Thread.run(Thread.java:840)
[test0 #1] Terminating callsFindOrigin (id: 3)
[test0 #1] [Pipeline] End of Pipeline
[test0 #1] java.lang.NullPointerException: Cannot invoke "org.jenkinsci.plugins.workflow.graph.FlowNode.getDisplayFunctionName()" because the return value of "org.jenkinsci.plugins.workflow.actions.ErrorAction.findOrigin(java.lang.Throwable, org.jenkinsci.plugins.workflow.flow.FlowExecution)" is null
[test0 #1] 	at org.jenkinsci.plugins.workflow.actions.ErrorActionTest$WrapperStep$Callback.onFailure(ErrorActionTest.java:293)
[test0 #1] Also:   org.jenkinsci.plugins.workflow.actions.ErrorAction$ErrorId: 1d275cd9-e796-406e-9d7d-50050a41013b
[test0 #1] Caused: java.lang.AssertionError
[test0 #1] 	at org.jenkinsci.plugins.workflow.actions.ErrorActionTest$WrapperStep$Callback.onFailure(ErrorActionTest.java:295)
…

[jglick]

Otherwise javac complains about nonfinal variables in lambdas, which is irritating since the complaint includes usages of t1 and t2 in previous clauses which are returning without ever running this block.