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View Full Version : HOWTO: Set gedit to compile and run Java source code


WiseElben
April 20th, 2007, 04:33 AM
Introduction

I use gedit with the terminal panel plugin when I'm programming small Java programs. This becomes a hassle sometimes, so I created a simple gedit "Tool" that would compile and run Java source files. Some people would prefer using just the plain terminal or a complicated IDE, but this is especially useful for students who just needs a basic yet easy-to-use interface to learn Java on.

Instructions

First, open gedit and go to Tools=>External Tools. Create a new tool and label it something like "Java Compile." Set an accelerator if you want to.

Then inside the Command, insert this:



#Compiles the current open Java source file.
echo "Compiling: " $GEDIT_CURRENT_DOCUMENT_PATH
echo '--------------------'
javac $GEDIT_CURRENT_DOCUMENT_PATH


The second part (the tool to run the class) is a bit more difficult because gedit runs the script using /bin/sh, which doesn't support the necessary regex command. Because of this, we have to make a separate script file.

Since gedit is already open, make a new file and copy in:



#!/bin/bash

#To be used with gedit Tools to run a compiled Java source file.
[[ $2 =~ "\w+" ]]
cd $1
java $BASH_REMATCH


Save as java_run under a .gedit folder in your home folder. You might need to create the .gedit folder.

Now, create another Tool. Call this one "Java Run" and copy the following under Command:


#Runs a compiled Java source file.
echo "Running: " $GEDIT_CURRENT_DOCUMENT_PATH
echo '--------------------'
bash ~/.gedit/java_run $GEDIT_CURRENT_DOCUMENT_DIR $GEDIT_CURRENT_DOCUMENT_NAME

You're done! You might want to create a sample program to test this.

Final Thoughts

This feature in gedit is a bit buggy, so don't be surprised if your custom Tools suddenly vanish or jump around; this happened to me a couple of times when I was figuring this out.
Rhenthalin
May 7th, 2007, 10:44 PM
This little device sounds absolutley wonderful for my purposes however, I do not seem to have the tool=>external tools feature. Is this a Feisty Fawn feature or is my gedit just very noobly.
zobdos
January 23rd, 2008, 10:43 PM
actually, there is a much easier way to run the compiled classfile...

code:

java ${GEDIT_CURRENT_DOCUMENT_NAME%\.*}

thats it. lol.
thomas_vergote
January 28th, 2008, 10:53 PM
Hi,

I'm a beginning java programmer (in two days I have my exam) and I use eclipse by default as editor and compiler.
However I want to compile and run my java programs also in gedit, because I love the simplicity of gedit and for a fast check, gedit is excellent...
So I found this thread and I am able to compile without any problem, however, running the program just doesn't seem to work out!
This is what I get:


Running: /home/thomas/workspace/examenvoorbereiding/src/TestSorteren.java
--------------------
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)

where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.

-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A : separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
Closed: 256

I hope someone can help me get this fixed, I must be doing something wrong and I suppose its something small...

Thanks!
phunkizm
January 30th, 2008, 03:08 PM
thomas,

I had the same problem, but then I tried zobdos' simpler version and it works great. Give it a try.
DaymItzJack
February 1st, 2008, 04:45 AM
How can I get this to save the current file before trying to compile? thanks.
danielarseno
April 6th, 2008, 09:40 PM
The following script will compile and, if compilation is successful, run the class.



#!/bin/sh
cd $GEDIT_CURRENT_DOCUMENT_DIR
if javac $GEDIT_CURRENT_DOCUMENT_NAME;
then
java ${GEDIT_CURRENT_DOCUMENT_NAME%\.java}
else
echo "Failed to compile"
fi
officialhopsof
May 10th, 2008, 07:43 AM
Here is a script for compiling and running a java program. I ran into the problem of having to set the class path, my script does this for you. Also, you have to have python installed for this to work.


#!/bin/sh

cd $GEDIT_CURRENT_DOCUMENT_DIR

python -c "
import os

arg = '$GEDIT_CURRENT_DOCUMENT_DIR/$GEDIT_CURRENT_DOCUMENT_NAME'
package = ''
data = open(arg, 'r').readlines()

for i in range(len(data)):
temp = data[i].strip()
if temp[0:7] == 'package':
package = temp[8:len(temp)-1]

if package != '':
for i in range(package.count('.') + 2):
arg = arg[0:arg.rfind('/')]

os.system('javac -cp ' + arg + ' ' + '$GEDIT_CURRENT_DOCUMENT_DIR/$GEDIT_CURRENT_DOCUMENT_NAME')
os.system('java -classpath ' + arg + ' ' + package + '.' + '${GEDIT_CURRENT_DOCUMENT_NAME%.java}')
else:
os.system('javac $GEDIT_CURRENT_DOCUMENT_NAME')
os.system('java ${GEDIT_CURRENT_DOCUMENT_NAME%.java}')
"


it works for my purposes. There is just one case that i can see that this wont work on, if you have something like this. my script will see the other package statement there and think it is the one we need.


/*
this is the old package
package something.another.and.another;
*/
package something.else.in.another.place;

that being the case, the following would work fine



//this is the old package
//package something.another.and.another;

package something.else.in.another.place;

because of the leading "//"

enjoy
D.Sync
July 25th, 2008, 06:17 AM
I had several issues here:

1) The following error occured when I import java.util.* to called the Scanner.


Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:855)
at java.util.Scanner.next(Scanner.java:1478)
at java.util.Scanner.nextInt(Scanner.java:2108)
at java.util.Scanner.nextInt(Scanner.java:2067)
at Q8.main(Q8.java:32)

Exited: 256

2) If the .java file is located on another drive, eg: /media/WINXP/Documents and Settings/UserName/My Documents/My Java, the following error will occured. But still, it will still run the .class file.


cd: 10: can't cd to /media/WINXP/Documents
KdotJ
April 13th, 2010, 02:08 AM
This is fantastic! This will save me some time!
thanks
matshofman
May 20th, 2010, 07:51 PM
I wanted to do this but I can't find see the Tools menu :S Does anyone know how to solve this?

[Solved]
I solved it, i needed to enable the External Tools plugin. Edit > Preferences > Plugins > External Tools

I'm using this code by the way to compile and run my Java file

#!/bin/sh
#Runs a compiled Java source file.
echo "Compile And Run:" $GEDIT_CURRENT_DOCUMENT_PATH
echo '--------------------'
javac $GEDIT_CURRENT_DOCUMENT_PATH
java ${GEDIT_CURRENT_DOCUMENT_NAME%\.*}
genoskill
August 29th, 2010, 07:40 PM
I wanted to do this but I can't find see the Tools menu :S Does anyone know how to solve this?

[Solved]
I solved it, i needed to enable the External Tools plugin. Edit > Preferences > Plugins > External Tools

I'm using this code by the way to compile and run my Java file

#!/bin/sh
#Runs a compiled Java source file.
echo "Compile And Run:" $GEDIT_CURRENT_DOCUMENT_PATH
echo '--------------------'
javac $GEDIT_CURRENT_DOCUMENT_PATH
java ${GEDIT_CURRENT_DOCUMENT_NAME%\.*}


Thank you very much matshofman, that code worked for me.
SvenVP
October 28th, 2010, 04:03 PM
ive used a xterm to open java aplication... i cant figure it out for gnome-terminal??? if you can it will be helpfull... thanks


#!/bin/sh
#Compiles the current open Java source file.
echo "Compiling Java Programm..." $GEDIT_CURRENT_DOCUMENT_PATH
echo '--------------------------'
javac $GEDIT_CURRENT_DOCUMENT_PATH

echo "Running Java Program... " $GEDIT_CURRENT_DOCUMENT_NAME;
echo '-----------------------';

xterm -hold -e java ${GEDIT_CURRENT_DOCUMENT_NAME%\.*}
bhaveshnande
June 22nd, 2011, 10:44 AM
It works perfect!
But how can I compile Java ME(Micro Edition) files in gedit?
Skorzen
October 5th, 2011, 08:27 PM
Guys,

And what if I need to pass arguments in my Java classes? This scripts just compile a given source code, right?

You saved me a lot of time, but I may need this feature. Can you please give me some light on this?

Best regards,
oldnik
October 18th, 2012, 10:02 PM
Hello everyone! It seems that thread is quite old, but methods still exist and are usable. I have configured my gedit to compile java code with adding an external tool to run the code:
#!/bin/sh
/usr/lib/jvm/java-7-openjdk-i386/bin/javac $GEDIT_CURRENT_DOCUMENT_PATH
java ${GEDIT_CURRENT_DOCUMENT_NAME%\.*} I used the full path for javac compiler because it didn't find one with only 'javac'. But here is an another problem. I've been using Eclipse IDE for a while and want to run the code from a project. It gives an error:
Exception in thread "main" java.lang.NoClassDefFoundError: myClass (wrong name: math/myClass) but if i comment the
package: math part then it gives this:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1416) while starting the program. Now i need to writedown the path to math lib or what?