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Jenkins failed to obtain

I am new to Jenkins and was trying to figure out Nodes. After I made a new node and run from agent command line I got this. Could it be related to this supposed issue I got in the node status "Java Web Start is not available for the JVM version running Jenkins"?
INFO: Using C:\Data\Slave\remoting as a remoting work directory
эю с. 14, 2021 11:06:48 PM org.jenkinsci.remoting.engine.WorkDirManager setupLogging
INFO: Both error and output logs will be printed to C:\Data\Slave\remoting
Failed to obtain http://8080/computer/DESKTOP/jenkins-agent.jnlp?encrypt=true
java.net.SocketException: Network is unreachable: connect
at java.base/java.net.PlainSocketImpl.connect0(Native Method)
at java.base/java.net.PlainSocketImpl.socketConnect(PlainSocketImpl.java:101)
at java.base/java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:412)
at java.base/java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:255)
at java.base/java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:237)
at java.base/java.net.Socket.connect(Socket.java:608)
at java.base/java.net.Socket.connect(Socket.java:557)
at java.base/sun.net.NetworkClient.doConnect(NetworkClient.java:182)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:474)
at java.base/sun.net.www.http.HttpClient.openServer(HttpClient.java:569)
at java.base/sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:341)
at java.base/sun.net.www.http.HttpClient.New(HttpClient.java:362)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1253)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1187)
at java.base/sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1081)
at java.base/sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1015)
at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:509)
at hudson.remoting.Launcher.run(Launcher.java:347)
at hudson.remoting.Launcher.main(Launcher.java:298)
Waiting 10 seconds before retry'

IntelliJ - Unable to start Tomcat 8. Starts fine via comand line

I'm a complete noob to IntelliJ and Tomcat 8. I managed to configured Tomcat 7 in IntelliJ in the same manner (as configuring TC8) and it works normally. Also, TC8 works when I start it up using command-line.
Here's what IntelliJ tells me when I try to run TC8:
"Application Server was not connected before run configuration stop,
reason: java.io.IOException: Failed to retrieve RMIServer stub:
javax.naming.CommunicationException [Root exception is
java.rmi.ConnectIOException: error during JRMP connection
establishment; nested exception is: java.net.SocketException:
Connection reset]"
Logs:
C:\apache-tomcat-8.0.8\bin\catalina.bat run Using CATALINA_BASE:
"C:\Program Files\Apache Software Foundation\Tomcat 8.0" Using
CATALINA_HOME: "C:\apache-tomcat-8.0.8" Using CATALINA_TMPDIR:
"C:\apache-tomcat-8.0.8\temp" Using JRE_HOME: "C:\Program
Files\Java\jre8" Using CLASSPATH:
"C:\apache-tomcat-8.0.8\bin\bootstrap.jar;C:\apache-tomcat-8.0.8\bin\tomcat-juli.jar"
Jun 06, 2014 1:22:08 AM org.apache.catalina.startup.Catalina load
WARNING: Unable to load server configuration from [C:\Program
Files\Apache Software Foundation\Tomcat 8.0\conf\server.xml] Jun 06,
2014 1:22:08 AM org.apache.catalina.startup.Catalina load WARNING:
Unable to load server configuration from [C:\Program Files\Apache
Software Foundation\Tomcat 8.0\conf\server.xml] Jun 06, 2014 1:22:08
AM org.apache.catalina.startup.Catalina start SEVERE: Cannot start
server. Server instance is not configured. Disconnected from server

Follow these steps :
Configure new Tomcat Server :
After configure click on OK.
Then on that one + symbol is there click on it i.e. in Green color, it shows :
then last step is to configure it for application :
from deployment tab add exploded file of application then configure that in which browser you want to open application then click OK, if you want to change more settings then you can.
Then try click on Green Button that will run your application.

ClassNotFoundException while starting the Tomcat 7 Server in MyEclipse

I am using MyEclipse 9 and Tomcat7.0 . I have taken latest code and deployed in Tomcat 7 and started the server. Immediately i got an error log as mentioned below.
INFO: The listener "org.apache.myfaces.webapp.StartupServletContextListener" is already configured for this context. The duplicate definition has been ignored.
Jan 10, 2014 5:53:40 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class com.aap.apweb.servlet.APServletContextListener
java.lang.ClassNotFoundException: com.aap.apweb.servlet.APServletContextListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:415)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:397)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4537)
at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5097)
at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5092)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Jan 10, 2014 5:53:40 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Error configuring application listener of class com.aap.apweb.servlet.APHTTPSessionListener
java.lang.ClassNotFoundException: com.aap.apweb.servlet.APHTTPSessionListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1676)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1521)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:415)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:397)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4537)
at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5097)
at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5092)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Jan 10, 2014 5:53:40 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Skipped installing application listeners due to previous error(s)
Jan 10, 2014 5:53:40 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Jan 10, 2014 5:53:40 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/apweb] startup failed due to previous errors
Jan 10, 2014 5:53:41 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/apweb] registered the JDBC driver [net.sourceforge.jtds.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
Jan 10, 2014 5:53:41 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-apr-8080"]
Jan 10, 2014 5:53:41 PM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["ajp-apr-8009"]
Jan 10, 2014 5:53:41 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 13243 ms
I think the jars path has to be set. But i am not able to find it.

Is com.aap.apweb.servlet.APHTTPSessionListener one of your classes? I don't get any hits on Google so I'm guessing it is. You need to ensure that you have set all dependencies in your build path and set deployment policies accordingly. Deployment policies for the project can be adjusted by right clicking on the project, selecting Properties, then going to the MyEclipse/Web page and clicking the Deployment tab. On that tab, you can choose to use the workbench settings (in which case most fields will be grayed out) or not (just deselect the "Use workbench default settings").
Note that the most recent release of MyEclipse gives you more explicit control over deployment, via a deployment assembly. A license for MyEclipse 9 also applies to MyEclipse 2014, which can be downloaded from the www.myeclipseide.com web site.

Right click on project
then go to build path -> add library in libraries pane.
then select server run time then add apache tomcat and then try to run your application.

You can export the required projects as jar files and place them in your .WAR file in WEB-INF\lib .This ensures that your classes from your jar files get loaded during application startup.

As per this line from the log:
The web application [/apweb] registered the JDBC driver [net.sourceforge.jtds.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
I have added db2 jdbc 1.6 jars(db2jcc4.jar and db2jcc4_license_cisuz.jar)to my project build path. These jars solved my problem while restarting the server. It started without any issue.
Thanks for all the geeks to responding me.

I am getting the same error when I started tomcat server in Eclipse Luna environment. And my OS is Ubuntu.
Actually the problem is when I build the project the web module not create the M2e-wtp maven folder. When we start the tomcat server it could not see the maven dependencies. That's while the exception came.
I resolve this issue by Downloading the latest Mars eclipse. And again I checked out my project.
After clean installed my project the issue was resolved. It's working fine.

Jenkins headless linux slave connection error

I get java.net.SocketException: Connection reset when trying to connect a headless debian slave to my main Jenkins master. It's been running good for a couple of weeks without error and suddenly I can't get it to connect.
I can telnet into the master on port 6256.
Slave output:
#> java -jar ~/slave.jar -jnlpUrl https://test.tv/jenkins/computer/debian_slave_node_1/slave-agent.jnlp
Aug 12, 2013 10:10:46 AM hudson.remoting.jnlp.Main$CuiListener <init>
INFO: Hudson agent is running in headless mode.
Aug 12, 2013 10:10:46 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Locating server among [https://test.tv/jenkins/, http://test.tv/jenkins/]
Aug 12, 2013 10:10:46 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to test.tv:6256
Aug 12, 2013 10:10:46 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Handshaking
Aug 12, 2013 10:10:46 AM hudson.remoting.jnlp.Main$CuiListener error
SEVERE: Connection reset
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:235)
at java.io.BufferedInputStream.read(BufferedInputStream.java:254)
at hudson.remoting.ClassicCommandTransport.create(ClassicCommandTransport.java:98)
at hudson.remoting.Channel.<init>(Channel.java:391)
at hudson.remoting.Channel.<init>(Channel.java:387)
at hudson.remoting.Channel.<init>(Channel.java:348)
at hudson.remoting.Channel.<init>(Channel.java:344)
at hudson.remoting.Channel.<init>(Channel.java:332)
at hudson.remoting.Engine.run(Engine.java:238)
Jenkins Master output:
java.io.IOException: Unexpected termination of the channel
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50)
Caused by: java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2596)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1316)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at hudson.remoting.Command.readFrom(Command.java:92)
at hudson.remoting.ClassicCommandTransport.read(ClassicCommandTransport.java:72)
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)

Hard to say what happens before knowing more. In particular:
does it fail at every connection request ? If so please check your auth.log on your server as it seems the failure happens after "status INFO: Handshaking" and before "Connected"
are your clock properly synchronized ?
what OSes are you using ? Which java version on your slaves ? check your PATH and JAVA_HOME
have you updated jenkins lately ? If so, have you updated the slave(s) ? Also have you tried reverting the update ? Which version are you using ? 1.520 took out support for JDK 1.5.
how do you run your java command ? From a terminal in an SSH session ? Is this scripted from the master ?
See also Jenkins slave jobs failing on "Unexpected termination of channel"

I've run into the same issue, which seemed to be worked-around by running jenkins-slave as root. Now, the thing periodically disconnects with that very same error, which I'm wondering is due to a LB keepalive. I'll update this answer as soon as I get more info.

In my case everything was working under root account. But under user account, node client failed to connect to server with message "failed Unexpected termination of the channel".
The problem was with access-or-write to working folder. As soon as I've reassigned owner throug "chown -R", node starts successfully.

Google App Engine not being accessed via localhost

I am using Mac OS X 10.7.4, app engine sdk 1.7.0, eclipse juno and Java as programming language. The problem is that App runs perfectly well when deployed on appspot but does not work on localhost. When run as web application on port 8888 or any other port (if change it from the configuration), the log represents server is running but when I hit the URL, nothing happens and after some time connection times out. When, debugged it gives the error: Cannot connect to VM. Logs from console for both run and debugged are shown below, kindly help me, I have searched all over the 'net but could not find the solution.
Log when Debugged:
ERROR: transport error 202: handshake failed - connection prematurally closed
ERROR: JDWP: Failed to initialize transport via localhost:49741, trying localhost via 127.0.0.1:49741
ERROR: transport error 202: recv failed during handshake: Connection reset by peer
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT(510)
JDWP exit error AGENT_ERROR_TRANSPORT_INIT(197): No transports initialized [../../../src/share/back/debugInit.c:690]
FATAL ERROR in native method: JDWP No transports initialized, jvmtiError=AGENT_ERROR_TRANSPORT_INIT(197)
Log when run:
2012-07-17 19:07:42.504 java[417:407] [Java CocoaComponent compatibility mode]: Enabled
2012-07-17 19:07:42.505 java[417:407] [Java CocoaComponent compatibility mode]: Setting timeout for SWT to 0.100000
Jul 17, 2012 2:07:49 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Jul 17, 2012 2:07:50 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed /Volumes/DATA 1/Google App Engine/Java/HelloWorld/war/WEB-INF/appengine-web.xml
Jul 17, 2012 2:07:50 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /Volumes/DATA 1/Google App Engine/Java/HelloWorld/war/WEB-INF/web.xml
Jul 17, 2012 7:07:52 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The server is running at localhost:8888/
Jul 17, 2012 7:07:52 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The admin console is running at localhost:8888/_ah/admin
Log when Run from command line:
Jul 21, 2012 3:23:19 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Jul 21, 2012 3:23:19 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed /Volumes/DATA 1/Softwares/appengine-java-sdk-1.7.0/demos
/guestbook/war/WEB-INF/appengine-web.xml
Jul 21, 2012 3:23:19 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed /Volumes/DATA 1/Softwares/appengine-java-sdk-1.7.0/demos/guestbook/war/WEB-INF/web.xml
Jul 21, 2012 8:23:22 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The server is running at http://localhost:8080/
Jul 21, 2012 8:23:23 PM com.google.appengine.tools.development.DevAppServerImpl start
INFO: The admin console is running at http://localhost:8080/_ah/admin

Check the following:
1) If the application has actually started. Enter "ps ax | grep java" in terminal
2) If the application has bound to the port. Install nmap (not sure how to do it on mac) and run it with "nmap localhost". You will see a list of ports and protocols used. If you don't see 8888 with http then something is wrong.

Have you tried running it from the command line? It looks like you're trying to start it in the debugger as well.. no? Try running from the command line, make sure that works. Then try running it from eclipse with "Run" not "Debug" and make sure that works before trying the debugger. Appengine is a little bit particular...