IntelliJ can t start simple web application Unable to ping server at localhost 1099

Question

I m trying to make a simple web app in IntelliJ by following this tutorial  http   wiki jetbrains net intellij Creating a simple Web application for Tomcat in IntelliJ IDEA 12  I believe my Tomcat is installed correctly since I see the tomcat pictures when I go to  http   localhost 8080   I ve followed all the steps up until the part it tells me to run index jsp  at which point I get the error   Error  Exception thrown by the agent   java net MalformedURLException  Local host name unknown  java net UnknownHostException  nodename nor servname provided  or not known   I see this in the log   Application Server was not connected before run configuration stop  reason             Unable to ping server at localhost 1099   This 1099 comes from the JMX port in Run -  Edit Configurations   How do I fix this

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I had same problem  In  Edit Configurations    -   Tomcat Server  I changed JRE from  Default  to my current version with SDK directory address  like C  Program Files Java jdk1 8 0 121 jre   My Tomcat version is 8 5 31

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To fix this you need add your machine name in the  etc hosts file to point to localhost 127 0 0 1    You can find your machine name by running the following command     hostname macbook-pro   From the output above you know your hostname is  macbook-pro    Edit   etc hosts  file and add that name at the end of line that lists 127 0 0 1  127 0 0 1 localhost macbook-pro   Save the file   Now you IntelliJ should be able to start your server

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Setting project s SDK in IntelliJ  File   Project Structure   Project Project SDK  worked for me

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I solve this problem adding the environment variables JAVA HOME C  Program Files Java jdkx x x xx  and JRE HOME

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FYI Under certain network conditions your hostname may change or be incorrect  If you are on a mac the following will let you set your hostname fairly permanently   sudo scutil --set HostName correct-name

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I had same issue and my mistake was  I was trying to start tomcat server with incompatible version of JDK and installed Apache tomcat server  In my case I had installed JDK 7 with Apache tomcat 9  For Apache 9 JDK should be    8   For compatibility check this https   tomcat apache org whichversion html

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In windows environment just check the PATH environment variable if Oracle JRE runtime refreshed the path and put himself at the very beginning of the path  In this case even if the JAVA HOME AND JRE HOME points to the correct JDK  the JRE will have precedence  And this case IntelliJ will not start Tomcat instance with the mentioned error message

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None of the answers above worked for me  In the end I figured out it was an configuration error  I used the android SDK and not Java SDK for compilation    Got to   Right Click on Project  --  Open Module Settings --  Module --   Dependendecies  and make sure you have configured and selected the Java SDK  not the android java sdk

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I added the following VM Options and it worked for me   -Dcom sun management jmxremote   -Dcom sun management jmxremote port 1099  -Dcom sun management jmxremote authenticate false  -Dcom sun management jmxremote ssl false

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This error came to me when I configured  wrong  3 Gb memory where there was none  IntelliJ does shows the real error message  Could not reserve enough space for object heap  in the Output frame   I was confused  and attracted by the message in the Event Log  which is to be ignored in this case

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I had the same problem of  Unable to ping server at localhost 1099  while I was using intellij 2016 version    However  as soon as I upgraded it to 2017 version Ultimate 2017 1  which is installed using  ideaIU-2017 1 exe  the problem disappeared

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I had similar issue when I entered very big port here    But when I corrected it to something smaller which is in offset range    Issue was resolved

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I added my hostname to  etc hosts on localhost  Added JAVA HOME but still it showed the same error  In the console  there was output   Unable to start as CATALINA BASE contains a colon     character   I solved the problem by going to Edit configurations -  Startup Connection -  changing CATALINA BASE value to the tomcat installation folder  Before that  it was  CATALINA BASE    C  Program Files Apache Software Foundation Tomcat 8 0   which can t be correct on a linux machine

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For those who encounter this when you just recently updated IntelliJ  In my case 2019 2    I am using JBoss server so i tried to run standalone bat in the command line and I saw the real issue on the console   It can be different to yours  but in my case I saw   failure description   WFLYSRV0137  No deployment content with   And on that error I was able to fix this by removing the items  war or ear  inside the  lt deployments  gt  node in my standalone xml  Hope this helps for those using JBoss IntelliJ

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I had this issue when running Tomcat 6 0 53 on Mac OS Sierra with Intellij IDEA to deploy Spring projects  This problem was solved after changing the Tomcat version to the  tar gz  one from official site  It seems the  zip  one is for windows

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For me  it was a much different solution since it was running on a virtualbox  so I had to edit the hosts file and add the virtualbox as a localhost  127 0 0 1 VirtualBox-blahblah

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My problem was that tomcat 8 and higher are not compatible with java 6  Changing to java 7 solved it

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See that the tomcat you are using is compatible with the Java version  For me the issue was Tomcat-9 required Java-8  If you have a older version of Java  you could use Tomcat-7 to test

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This appears to be a problem with the way mac is handling reading the  etc hosts file    See for example http   youtrack jetbrains com issue IDEA-96865  Adding the hostname to the hosts file as bond described should not be required  but it does solve the problem

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If you are using java 7 then make sure you have Tomcat 7 brew install tomcat 7 and update run configuration to Tomcat 7 Tomcat 9 is working with java 8

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On top pointing my hostname to 127 0 0 1 in hosts  just run hostname in cmd to get it  as well as doing what David GC mentioned  for me the error cleared and debugging worked when I went into the tomcat configuration and changed the debugging startup script from startup bat  which was just my monkeying around  back to the catalina bat start default

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I meet this question when i use intellij 15 0 then i update to 15 02 version  after that  I edit configurations and reset the Default JRE to my own JRE It works well for me

[java] IntelliJ, can't start simple web application: Unable to ping server at localhost:1099

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