I have a scala project built with dependancy on a locally built jar file (java code). Once I need to check in my scala code into a different environment for building and deployment, what's the best way to keep my jar file in the dependancy?
I know that if I use the sbt dependancy from online modules, I don't need to worry, it will download the version and build, but what if I want to use my own jar file for this purpose?
This is in OSX, and code will be checked into linux machines, I am using intellij and sbt to manage my scala project. I also used intellij to build my external java lib into jar file and added dependancy of this specific path.
I hope there should be some generic solution, but I am new in JAVA and SBT
I got it figured out. Add the jar files under the lib directory right under the project will solve the problem. SBT will pick it up automatically and you can certainly check in the jar files like source code.
Related
I have a multi-project SBT build: some projects are dependent on each other, some are dependent on third-party JARs, and there's a "main" project which depends on everything .
When I sbt package it, I get one JAR in each target/ directory.
What I want to achieve is getting all relevant JARs (mine and external) is one directory. Very similar to the way you package a WAR with Maven.
(And to clarify - I'm not interested in an assembled "FAT JAR" that contains all the dependencies in a single file. Just one directory with all JARs in it)
Im not 100% sure about the suprobject dependencies but I think SBT native packager should help you do something like that, and will also provide a start-script for windows and unixes:
http://www.scala-sbt.org/sbt-native-packager/GettingStartedApplications/MyFirstProject.html
I would recommend sbt-pack for creating self-contained JARs:
https://github.com/xerial/sbt-pack
I use it and haven't seen a glitch so far.
It also generates both OS X/Linux as well as Windows .bat entry scripts for the main classes/objects you choose.
I am trying to use the library scala-io in my Eclipse environment, does anyone know how do I generate a jar file, or which folder to include in my eclipse so that I can have access to the scala-io library from my project ?
EDIT:
Q: How to incorporate an external library into scala IDE?
A: Two possibilities:
Leverage SBT to build your project; that is generating jar files and maintaining dependency
Including the generted jar files directory in the IDE, project -> Properties -> Java build paths.
hth.
EDIT #2:
I found this great plugin to generate all of your dependencies in one jar file sbt-assembly
http://jesseeichar.github.io/scala-io-doc/0.4.2/index.html#!/getting-started
shows how to start with sbt or maven or with prebuild jars provided by links.
You should try to get familiar with a build system like sbt. Its cumbersome to always manually add dependencies to eclipse, especially if you have dependency chains: scala-io needs scala-io-core and arm and file etc...
I want to use scala compiler library, and add it in Eclipse,
but when compiling the project again using eclipse, the library is deleted automatically by the compilation. What's wrong with that?
So the question is: if my play project want to use scala-compiler.jar, how to add that?
it does not work by using build path-> configure build path... in eclipse...
I also tried to put all the jar files to the lib/ folder, but when compiling again in the server using eclipse, it still gives out compiling errors because of not finding the jars.
Thanks in advance,
The most failure-proof way to add it is to use Play's configuration builder, not adding it explicitly with Eclipse. To build a correct Eclipse project, use:
$ play
[YourProject] $ eclipse
[info] About to create Eclipse project files for your project(s).
[info] Successfully created Eclipse project files for project(s):
Then you can import it from Eclipse under File/Import/General/Existing project… (see here for more).
Note that Play uses sbt, which is already configured to use some version of Scala.
I'm added a dependence to my build.sbt (casbah). I did a sbt update, I did check my ~/.ivy2/cache directory and all jars are there. Do I have to add this ~/.ivy/cache directory to my Build Path and add the casbah as external Jar to my project? If no, probably no because I did try it, what should I do to be able to use this jar in my scala project?
EDIT
I found this instructions that helped me, but still a hack
Establish a simple project (general/project) named "IvyCache"
located at your ".ivy2/cache" folder just for library reference
purposes.
Establish a Scala project located at your "project" folder.
Add the following libraries to the Scala project by means of "Add
JARs" to the "Java Build Path":
3.a) All jars from "/IvyCashe/org.scala-tools.sbt" filterred by
"*2.9.1-0.11.2" or any other Scala/SBT version numbers.
3.b) A single sbinary_*.jar from "/IvyCache/org.scala-tools.sbinary".
3.c) A single test-interface*.jar from "/IvyCache/org.scala-
tools.testing".
Now your build files should compile within Eclipse.
The easiest way to manage this is to use the eclipse plugin for sbt. Then you can just say sbt eclipse on the command line any time you change the dependencies in build.sbt, and the Eclipse files will be automatically updated for you.
Doing it this way means that you will never have to manually configure your Eclipse build path. After all, sbt already knows how to construct the build path, so there's no reason you would have to do it manually.
I have two java files. They run fine in NetBeans, but I have to compile them in javac, and run them on a unix machine since I'm connecting to a database on my school's server.
I've been searching online but everything is too specific, and I'm not too familiar with NetBeans.
What I'm doing is copying those two java files, and a .form file to a directory on my school's server, and then try to compile the two java files using javac. However, I'm assuming that it doesn't compile because it's missing all the information from the .form file?
I'm getting 100 errors when compiling the one of the java files, and they look something like this:
CARTSJFrame.java:380: package org.jdesktop.layout does not exist
.add(jPanel9, org.jdesktop.layout.GroupLayout.PREFERRED_ SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLay
My guess was that it has something to do with the .form file that I can see in my NetBeans project directory.
I've looked at previous questions about this but still haven't been able to figure this out. Any help is appreciated.
You are running into compilation errors because NetBeans includes a jar in your project's classpath automagically when you compile and run the project.
NetBeans uses the dot-form file to help it generate code for the layout. It is not used at compilation time.
There are a couple strategies that you can follow to resolve this problem:
Get the jar that has the classes...
http://www.findjar.com/jar/net.java.dev.swing-layout/jars/swing-layout-1.0.1.jar.html;jsessionid=252692AC0FBE9421C9436A748744ACED... and include that jar in your
classpath at compile and runtime.
Convert the code in your project to
use the javax.swing.GroupLayout.
This is a 'standard part' of Java SE 6. This SO answer covers how to convert between
org.jdesktop.layout.GroupLayout and
javax.swing.GroupLayout in
NetBeans.
I think your problem is that javac doesn't know where to find that library.
A typical Java project uses many libraries. Netbeans uses a folder "lib" to store those libraries and also some configuration files to automatically set the classpath. The classpath is a environment variable that Javac uses to 'know' where are the libraries.
When you use javac to compile the java files you need to provide the CLASSPATH variable first. Write all you dependencies.
An example:
Project/compile_all.sh
export CLASSPATH=$CLASSPATH:"lib/jopt-simple-3.2.jar":"lib/commons-io-2.0.jar"
javac src/*.java
Now you just need to run
sh compile_all.sh
And it compiles all you .java files