I installed Hadoop-0.20.2(single node) and configured it on Linux(Centos).I installed Eclipse and added Eclipse-plugin for Hadoop. I put dataset in /home/Hadoop/input/ali.txt . I am not able to run Wordcount example on Hadoop in Eclipse. When I select the option "to Run on Hadoop", Something doesn't happen.
In addition , when running Wordcount example in Eclipse as java application, encounter with the following error:
Input path does not exist: file:/home/hadoop/workspace/wordcount/home/hadoop/input/ali.txt
help me.
Without the details about which is your $HADOOP_HOME directory and how you configured eclipse before trying to run the program, it is difficult to pin-point the error. However, this is a nice step-by-step guide on creating and testing a Hadoop project using eclipse.
Related
i did a setup of eclipse IDE for my ubuntu19.04 x64.
disclaimer: i am not at all a java dev, but i need this IDE to run a project i work with locally an no one in the team can tell me how to do so without this IDE.
so i took an eclipse installer from the official website. "by Oomph", i chosed "Eclipse IDE for Java Developers"
setup runs sucessfully, IDE launches, i did open my java project with it, fine.
but when i close the IDE i have no idea how to launch it again. Nothing useful is found in the head up display of ubuntu when i search for "eclipse".
the installed created a config folder in my user home folder, just containing a setup log.
But there is no executable here.
i don't get why they do something so hidden. Any other ide i tested is able to be launched from CLI by its name.
so if anyone is used to eclipse your advice would be welcome.
oh well, this Oomph installer is damn misleading.
It says that the install folder is
/home/$USER/eclipse
but in reality, where i can find the executable is
/home/$USER/java-2019-09/eclipse
now i just have to add this folder to my $PATH variable in my .profile to be able to launch it from command line.
thank you all
Please see the following webpage: https://netbeans.org/features/ide//build-tools.html. It says: "You can therefore build and run your project outside the IDE exactly as it is built and run inside the IDE.".
I have spent hours trying to figure out how to see this Ant Script. I have found suggestions such as setting: Toola\Options\Ant\Verbosity Level to Debug etc, but I see nothing. How do I see the Ant script generated by Netbeans?
I am trying to see what Netbeans generates when I run the app, so that I can try to run the app externally to Netbeans. It is a J2EE app.
Look for build.xml
But J2EE apps must be run inside a webserver such as Tomcat.
You can't run them from the command prompt.
You can follow the Java EE tutorial regarding that topic: http://docs.oracle.com/javaee/6/tutorial/doc/gkhpu.html#gkhol
In case you would decide to use Maven, then the newer version can be more applicable: https://docs.oracle.com/javaee/7/tutorial/usingexamples.htm#GFIUD
i am new to Hadoop,i successfully installed Hadoop 2.2.0 pseudo distributed mode and successfully executed some example programs like word count ,PI through command prompt ,now i want to practice some map reduce programs using eclipse ,so i installed Eclipse juno first but does not know how to configure eclipse for hadoop,can anyone tell steps to configure the Eclipse juno for hadoop 2.2.0.
Thanks in Advance.
It is easy to get Eclipse configured for Hadoop. Basically you need to setup the Build Path and configure Ant and Maven. There is a good write up Here Check that out and come back with any questions once you get started.
Even though the above link references Cloudera, the Eclipse configuration is the same as a manually installed Hadoop release as it relates to getting Eclipse working. You will need to follow steps 1 - 4 at least in order to get the correct Build Path, Ant configuration and Hadoop run time jars in the correct Path.
The easiest way to make sure you have configured Eclipse correctly is to create a Java project and copy/paste the wordcount java file into the project. Once saved take a look at any errors in the console. If you have everything correctly configured you will be able to compile worcount and should have wordcount.class in you projects bin dir
1.Build the project with maven(m2e plugin) and the required jar files in the classpath.
2.Export the jar for the project.
3.Use command line utility of Hadoop to execute the MapReduce Job.
As a newbie to programming, I am finding it really quite difficult to install all the necessary software and such to get everything running.
Up until now I have been using the command prompt and javac along with gedit to edit/compile my code, but we are meant to be using eclipse and then JUnit to test it.
I have just managed to get eclipse working, but still stuck as to how to get JUnit working.
I am stuck on the installation part...
The JUnit FAQ (http://junit.sourceforge.net/doc/faq/faq.htm#started_1) states...
Windows
To install JUnit on Windows, follow these steps:
Unzip the junit.zip distribution file to a directory referred to as %JUNIT_HOME%.
Add JUnit to the classpath:
set CLASSPATH=%CLASSPATH%;%JUNIT_HOME%\junit.jar
How can you "unzip" the "junit.zip distribution file" to the directory "%JUNIT_HOME%" and how do you add something to the classpath? Where is this class path? I tried extracting the zip folder and typing "%JUNIT_HOME%" into the directory, but it says the destination path is invalid, so I assume this is not what the instructions mean.
Apologies for the noob-questions... I'm finding this technical jargon difficult to find my way around.
Any hints for the next steps for installing JUnit will also be appreciated, as I will likely get stuck on those too.
If you are using Eclipse, please import the junit.jar file to your classpath in your project. You can do it by right+click on the project and choose Properties -> Java Build Path. and add you jar file.
I'm working on an application for my distributed system laboratory course. I have a working ant buildfile that runs multiple targets. My modus operandi currently is to open terminal windows (linux) and run separate ant targets.(with a Logger)
what i would need is the possibility to:
run and debug the project with the ant buildfile in eclipse
open multiple eclipse consoles (or maybe eclipse remote systems - local shells), one per ant target
i found a very good answer/solution here:
https://stackoverflow.com/q/316783
but i didn't get it all together. i read the oracle tut for jar file creation and tried to write a manifest file, i guess creating a java launcher is really basic knowledge,
but it didn't work.
could someone please describe, how to implement the solution by "VonC" in detail (https://stackoverflow.com/q/316783) or share a better/similar/more "simple" one?
You don't need to create your own jar. What the solution is talking about is setting up an Eclipse launcher from an ant target.
A tutorial on how to set it up:
http://individual.utoronto.ca/kia/