I see the following exception after installing the selenium plugin. I know the plugin is not maintained anymore, but I'm not sure if the exception is caused by remoting.
/usr/lib/jvm/java-11-openjdk-amd64/bin/java -cp /var/cache/jenkins/war/WEB-INF/lib/remoting-4.5.jar hudson.remoting.Launcher -cp /var/lib/jenkins/plugins/selenium/WEB-INF/lib/selenium-server-standalone-3.141.59.jar:/var/lib/jenkins/plugins/selenium/WEB-INF/lib/htmlunit-driver-standalone-2.33.3.jar -connectTo localhost:37677
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by hudson.remoting.Launcher (file:/var/cache/jenkins/war/WEB-INF/lib/remoting-4.5.jar) to method java.net.URLClassLoader.addURL(java.net.URL)
WARNING: Please consider reporting this to the maintainers of hudson.remoting.Launcher
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Exception in thread "main" java.lang.IllegalArgumentException: object is not an instance of declaring class
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at hudson.remoting.Launcher.addClasspath(Launcher.java:154)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at io.jenkins.remoting.shaded.org.kohsuke.args4j.spi.MethodSetter.addValue(MethodSetter.java:47)
at io.jenkins.remoting.shaded.org.kohsuke.args4j.spi.StringOptionHandler.parseArguments(StringOptionHandler.java:19)
at io.jenkins.remoting.shaded.org.kohsuke.args4j.CmdLineParser.parseArgument(CmdLineParser.java:520)
at hudson.remoting.Launcher.main(Launcher.java:293)
relates to
JENKINS-65582Illegal reflective access by jenkins.slaves.StandardOutputSwapper$ChannelSwapper to constructor java.io.FileDescriptor(int)
I can't remember but it might be related to the Selenium plugin. I remember something like that from a couple of years ago.
It might also have something to do with running in Java 11, which I haven't tried very much.
Jeff Thompson
added a comment - I can't remember but it might be related to the Selenium plugin. I remember something like that from a couple of years ago.
It might also have something to do with running in Java 11, which I haven't tried very much.
Yes, It's related to java 11, with java 8 it works. The question is if it's related to remoting-4.x.jar or selenium-server-standalone-3.141.59.jar. Should remoting work with java 11+ in general or are there any known issues?
Markus
added a comment - Yes, It's related to java 11, with java 8 it works. The question is if it's related to remoting-4.x.jar or selenium-server-standalone-3.141.59.jar. Should remoting work with java 11+ in general or are there any known issues?
Remoting should work with Java 11, but there may be a few odd warning messages. Possibly including this one. I don't know if it is related to Remoting or Selenium.
Jeff Thompson
added a comment - Remoting should work with Java 11, but there may be a few odd warning messages. Possibly including this one. I don't know if it is related to Remoting or Selenium.
"WARNING: Illegal reflective access by jenkins.slaves.StandardOutputSwapper$ChannelSwapper to constructor java.io.FileDescriptor(int)"
So from my perspective, it is JDK11 <=> slave.jar. I'm as well using remoting 4.5.
Martin Jost
added a comment - Note: I see a similar warning with JDK11 on RH7, but definitely w/o Selenium plugin : https://issues.jenkins.io/browse/JENKINS-65582
"WARNING: Illegal reflective access by jenkins.slaves.StandardOutputSwapper$ChannelSwapper to constructor java.io.FileDescriptor(int)"
So from my perspective, it is JDK11 <=> slave.jar. I'm as well using remoting 4.5.
What is calling hudson.remoting.Launcher with the -cp option? Its implementation assumes that the system classloader is a URLClassLoader, which isn't the case in Java 9 and later. In other words, this option just won't work in Java 11. I suggest the option simply be removed from Remoting, once all callers have been weaned off it.
Basil Crow
added a comment - What is calling hudson.remoting.Launcher with the -cp option? Its implementation assumes that the system classloader is a URLClassLoader , which isn't the case in Java 9 and later. In other words, this option just won't work in Java 11. I suggest the option simply be removed from Remoting, once all callers have been weaned off it.
Jesse Glick
added a comment - https://github.com/jenkinsci/remoting/pull/468 would cover the originally reported case. The ChannelSwapper warning is different.
The ChannelSwapper warning could be eliminated by just deleting StandardOutputSwapper and StandardOutputStream. The risk is that poorly behaved plugins might have code which writes to System.out from a Remoting callable. If they do, and Remoting is using stdio mode (e.g. CommandLauncher), you could get sudden channel corruption.
Jesse Glick
added a comment - The ChannelSwapper warning could be eliminated by just deleting StandardOutputSwapper and StandardOutputStream . The risk is that poorly behaved plugins might have code which writes to System.out from a Remoting callable. If they do, and Remoting is using stdio mode (e.g. CommandLauncher ), you could get sudden channel corruption.
I suppose this could be dealt with by having the stdio mode use a slightly more complicated protocol (new Channel.Mode?) whereby each packet is printed as text-ish with a distinctive or even random prefix and a trailing newline. Thus any unrelated messages printed to stdout would just be ignored.
Jesse Glick
added a comment - I suppose this could be dealt with by having the stdio mode use a slightly more complicated protocol (new Channel.Mode ?) whereby each packet is printed as text-ish with a distinctive or even random prefix and a trailing newline. Thus any unrelated messages printed to stdout would just be ignored.
Remoting 4.11 is included in Jenkins 2.317. Remoting 4.11 removes the -cp argument from the remoting command line.
Mark Waite
added a comment - Remoting 4.11 is included in Jenkins 2.317. Remoting 4.11 removes the -cp argument from the remoting command line.
Jeff Thompson
Markus
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Issues which are closed can be reopened.","iconUrl":"/images/icons/statuses/closed.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Closed</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/open.png\" value=\"10003\" title=\"To Do\" data-simple-status=\"{"id":"10003","name":"To Do","description":"","iconUrl":"/images/icons/statuses/open.png","statusCategory":{"id":2,"key":"new","colorName":"default"}}\">To Do</option>\n <option class=\"imagebacked\" data-icon=\"/images/icons/statuses/closed.png\" value=\"10004\" title=\"Done\" data-simple-status=\"{"id":"10004","name":"Done","description":"","iconUrl":"/images/icons/statuses/closed.png","statusCategory":{"id":3,"key":"done","colorName":"success"}}\">Done</option>\n </optgroup>\n</select>\n </div>\n \n","validSearcher":true,"isShown":true},"labels":{"name":"Label","viewHtml":" <div class=\"searcherValue\">\n \n <label class=\"fieldLabel\" for=\"fieldlabels\">Label:</label><span id=\"fieldlabels\" class=\"fieldValue\">\n \n illegalReflectiveAccess\n</span></div>\n","editHtml":"\n <div class=\"field-group aui-field-labels\" >\n <label for=\"searcher-labels\">Labels</label> <select class=\"js-label-checkboxmultiselect\" multiple=\"multiple\" id=\"searcher-labels\" name=\"labels\" data-placeholder-text=\"Find Labels...\">\n <option value=\"illegalReflectiveAccess\" title=\"illegalReflectiveAccess\" selected=\"selected\">illegalReflectiveAccess</option>\n </select>\n </div>\n \n","jql":"labels = illegalReflectiveAccess","validSearcher":true,"isShown":true}}}
[{"id":-1,"name":"My open issues","jql":"assignee = currentUser() AND resolution = Unresolved order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-2,"name":"Reported by me","jql":"reporter = currentUser() order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":true},{"id":-4,"name":"All issues","jql":"order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-5,"name":"Open issues","jql":"resolution = Unresolved order by priority DESC,updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-9,"name":"Done issues","jql":"statusCategory = Done order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-3,"name":"Viewed recently","jql":"issuekey in issueHistory() order by lastViewed DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-6,"name":"Created recently","jql":"created >= -1w order by created DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-7,"name":"Resolved recently","jql":"resolutiondate >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false},{"id":-8,"name":"Updated recently","jql":"updated >= -1w order by updated DESC","isSystem":true,"sharePermissions":[],"requiresLogin":false}]
I can't remember but it might be related to the Selenium plugin. I remember something like that from a couple of years ago.
It might also have something to do with running in Java 11, which I haven't tried very much.