I'm following a set of instructions in order to load data to an h2 database to which later connect using R. the first step is to load data using Java at the command line. There are concrete instructions on which commmands to use. For example:
java -classpath SQLScrewdriver.jar:h2-1.3.170.jar \
com.winvector.db.LoadFiles \
file:dbDef.xml \
Where do I execute these commands? Should I use a concrete CLI? I'm a newbie using all these tools and I'm kind of lost. Thanks for the help in advance.
You type those commands into a Terminal window (on Mac), or a shell prompt (on Linux/Unix) or a command prompt window (on Windows).
From the commands you write, you'll want the terminal window to be in the directory where the SQLScrewdriver.jar and h2-1.3.170.jar files are located (and where the dbDef.xml file is also...otherwise you'll need to add the directory location to the file name, so that these can be found by the program). On Mac (or basically any Unix/Linux machine) you'll want to first type 'cd /path/to/the/jar/files' into the terminal window first, so that you end up where the jar files are located.
You may want to spend an hour or 2 with a basic Java tutorial so that you get comfortable running java programs. Good luck. BTW, I think 'Practical Data Science with R' is a good book.
Related
Everybody probably has used install .exe files. But how to make them and when does it make sense to make one?
For example, I would have had programmed commercial software in Python, c++, etc. with different files a GUI and pictures and all of the other stuff.
When I want to deliver my product to my customer I don't want to give them a folder and say you need to install Python or Java and execute the program via your command line.
How can I create an executable file that installs the required language and sets up local instances and arranges all files into the correct order?
To create an executable file from a python program, there is pyinstaller. I don't know about java at the moment. The command is as follows :
pyinstaller fileName.py
You can add args (and there are 2 really helpful ones) :
pyinstaller --onefile -w fileName.py
--onefile will put everything into one single file (recommended) and -w will prevent the console from opening when running the .exe file. Add it if you're running a GUI or something. If you need to console for input, don't add -w.
If you want to automate a command line in cmd, create a shortcut leading to C:\Windows\system32\cmd.exe and add /k and your command. For example :
C:\Windows\system32\cmd.exe /k ipconfig
Double clicking on the shortcut will now run the cmd and execute ipconfig automatically. If you want more than one command, you can do command_1 && command_2 && ... && command_n
There is a setup program built into Windows.
Type
iexpress
and follow the wizard.
You need to provide code to run when it finishes to actually install the extracted files.;
I wanted to put a java classfile up for download recently, which people could run in Terminal. It's a Minecraft command generator, so the people downloading it won't necessarily have the greatest mental capacity (I'm referring to 8-year-olds who have no idea what they're doing, of course).
Anyway, I wanted to provide a simple, single command, both for the Mac / Linux terminal and the Windows command line, that ran the classfile without any complications. The problem is, I don't want to execute it by doing /cd path, and then doing java someFolder.someClass. I just want to have a single command to open the file. If anyone could provide these commands for me, both in Mac / Linux and Windows, that would be great.
Sorry for the super long explanation :P
A jar file with a main class in the manifest would probably be the easiest thing. Then the command is java -jar myjarfile.jar.
A swing application would probably be easier as the default way of running executable jars doesn't open a command prompt (it uses javaw instead of java).
You will have to first start a terminal and then run java in that terminal, which can be a bit tricky.
How to open a command terminal in Linux?
Why not create an interface (Swing) and pack everything in a jar?
I am currently writing my master thesis and want to use this unofficial google api to automatically download some search queries.
https://github.com/elibus/j-google-trends-client/blob/master/README.md
I am very new to this stuff, so I would need some help to specify some inputs to get the data I need.
I have a list of queries in the same folder as the .jar which I want to use as imput for the API. But I fail to tell the program to use this folder as I do not know the proper command.
The creator of this API told me that the following would work on Linux (I use windows 8.1 (unfortunately)) but I could not transfer it to comands appropriate for my system.
for i in cat query_list.txt;do java -jar
java -jar j-google-trends-client.jar -u user -p pass -q "$i";done
More specifaclly, i got the msg that "i was unexpeted in that place". Does someone know that have to do?
Help would be much appreciated!
Thanks a lot and best regards
Micha
Those linux programs don't exist in Windows. Perhaps the following works (Java has to be in your path variable):
for /F "tokens=*" %A in (query_list.txt) do java -jar j-google-trends-client.jar -u user -p pass -q %A
I used How to do multiple things to each file in a directory with a batch script for this.
I have a Java application that needs to implement installation features of making a JAR launch on startup.
I can do this on Window by entering a REG file into the registry, but how can I do this on UNIX platforms? Linux and Mac if the methods are different.
Do Linux and Mac have system startup folders?
Remember that I need to do this programmatically not through system preferences or anything like that.
On Linux, the classic way would be through adding a script in the appropriate /etc/rcN.d/ directory (where N is a number 0-6 representing the 'run level'). I'm not sure whether that's still the recommended way, but it usually is still supported. This would also work with minor variations for other mainstream Unix variants (Solaris, HP-UX, AIX).
On Mac, you have to work harder. The files /etc/rc.common, /etc/rc.imaging and /etc/rc.netboot are related, but there are no /etc/rcN.d directories. There's also a script rc and another rc.local. Typing man rc reveals:
DESCRIPTION
rc.local is now unsupported and has been replaced with launchd(8), which bootstraps itself via the launchctl(1) bootstrap subcommand to read in launchd(8) jobs from the standard locations.
SEE ALSO
launchd(8), launchctl(1)
So, you should investigate launchctl and launchd, particularly launchctl.
This is how I would do it on ubuntu.
First create a bash script to run the java app, similar to.
#!/bin/bash
java -jar "helloworld.jar"
and save it, in this case called 'HELLOWORLD' in /etc/init.d.
Need to make the script executable so need to run
chmod +x HELLOWORLD
Finally to make it run on start up
update-rc.d HELLOWORLD defaults
On Macs I think its launchd, and on linux its init.d. They are config files.
I developed a project using Java and now I've to deliver it to client who is using Linux. Which executable file format will be delivered and how to make that?
Executable file format?
If you're delivering a Java app, give them a jar file (and associated libs).
Provide a shell script to set up its environment and execute it.
For example, assuming I define ROOT_DIR as my app's install directory, and so on:
CLASSPATH="${ADD_JARS}:${CLASSPATH}:${ROOT_DIR}/lib/myApp.jar:\
${ROOT_DIR}/lib/jibx/jibx-run.jar:\
${ROOT_DIR}/lib/jibx/xpp3.jar:\
${ROOT_DIR}/lib/bindings.jar:\
${ROOT_DIR}/lib/commons-lang-2.0.jar:\
${ROOT_DIR}/lib/forms-1.0.5.jar"
"${JAVACMD}" -Xmx256M -DanyDefsNeeded=foobar -Dbase.dir="${ROOT_DIR}" -cp "${CLASSPATH}" myApp.main.Launcher "$#"
What goes into the shell script depends totally on what your app actually needs to start up.
A jar. If it is not executable, then a script (.sh) to launch the jar.
Well basically what you wanna put in a .sh file is the commands you'd normally type at the console to run your jar file. They should be separated by a new line (i.e. each on a separate line in the .sh file).
The most basic you can go is add something like this to your sh file:
java -Xms=64m -Xmx=256m -jar myJar.jar -classpath [dependencies dir]/dep1.jar,[dependencies dir]/dep2.jar
beyond this you can do more exotic stuff, like parametrise some environment variables, get command line argumens from when the .sh is launched and pass them to the jar executatble etc. Look up "bash scripting" for advanced stuff:
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-2.html#ss2.1
You might have better luck using Launch4J, IzPack or other installer that has cross-platform capabilities. This might be a better first option than trying to understand the intricacies and idiosyncrasies of the different Linux distributions and shells.
If your app. has a GUI, the best user experience for installation/deployment can be had by way of Java Web Start. Note that JWS can deploy apps. to Windows, *nix and Mac. and avoids all the maintenance woes of generating 3 separate (platform specific) executables.