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Two part question:
1) I have the requirement to attach the jacoco agent to an already running JVM, and per this comment on a Github issue, this was not possible as of 26th July 2018. Has support for this been implemented in the v0.8.5? Because the changelogs do not mention it.
2) If I start a jacoco agent as such:
java -javaagent:jacocoagent.jar=dumponexit=false,output=tcpserver,address=*,port=6300 -jar my-app-0.0.1-SNAPSHOT.jar
Is it possible to gracefully kill the tcpserver that starts up only while keeping the jar running. I am looking for an alternative to having to writing a script that would need to look up the PID on port 6300 and kill the process. Preferably a jacoco cli command but the API Docs do not mention it.
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I was trying to create a java application that automatically build my project.Is it possible to create a java program to run a maven project?
You can follow below approach to start:
Create a batch/shell file to build your project using mvn/ant/gradle
command. You would need Maven/Ant/Gradle installed in your system
and environment variable needs to be setup properly.
Run This batch/shell file using java by taking advantage of Runtime
Class. Runtime.getRuntime().exec("cmd /c start build.bat");
To schedule your java program, Use ExecutorService or Quartz. Or you
can take advantage of Operating System Schedulers as well.
Hope this helps.
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I am new to Jenkins, I configured Jenkins with my CVS and I am stuck, after building the project using Jenkins I need it to be deployed automatically into the server so I can access the project.
This can be achieved by adding a "post-build" action in Jenkins, action of type can be "Deploy war/ear to a container" - that let's you define your configuration. Your question is too broad. I would suggest you read up on jenkin configurations or at least tinker with it.
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As tomcat server is completely developed in Java, yet its installation file(.exe) are available for windows. As tomcat is open source, does the process of converting this java server application into windows installation file also documented anywhere. Which tool they use and how its works. How have they created UI wizard to take user inputs and do the registry entry and install tomcat as service.
Regards
They use Nullsoft Installer called from the ant build.
The nsi script can be found on svn, as well as all of tomcat code.
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The question I asked was marked as too broad. After searching around more I got my basics more clear. So hopefully I will be much more specific now.
Basically I was trying to run the sample examples given on eclipse rather than on terminal. My first doubt has already been answered correctly. Using setMaster("local"). I got the example running n it displayed output quite correctly. Now if I change this to setMaster("yarn-client") now it connects to yarn, also submits the job then runs it but finally I get classnotfoundexception and hence reduce not completed. If I want to use yarn-client do I need to add some extra specification for my class so that I don't get classnotfoundexception. For this entire process I used the inbuilt JavaPiSpark example program in my version of spark. Any help or suggestion is welcome.
You should use JavaSparkContext .setMaster("local") to run on your local machine or replace the "local" with a specific master URL to run on clusters.
Please refer spark programming guide - initializing-spark and master-urls
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This might be a basic question, but I searched for it before posting it.
I'm an SAP Guy.
Earlier SAP used to rely on Vendor JVM: SunJDK.
Now it has developed its own, called SAP JVM.
My question is:
On a Unix OS, how do I know how many applications are using the JAVA_HOME environment?
-OR-
How do I know on Unix which applications are using the java environments?
So a relatively naive way of doing this would be to run:
ps -elf | grep java
this will list out all the current processes that were started using java.