I currently have a problem with recompile on code change with sbt.
I was following the sbt reference 'sbt by example'
I installed sbt 1.2.8 and followed the instructions:
Create a minimum sbt build
$ mkdir foo-build
$ cd foo-build
$ touch build.sbt
Start sbt shell
$ sbt
[info] Loading global plugins from C:\Users\hce\.sbt\1.0\plugins
[info] Loading project definition from E:\learn\Scala\demo\foo-build\project
[info] Loading settings for project foo-build from build.sbt ...
[info] Set current project to foo-build (in build file:/E:/learn/Scala/demo/foo-build/)
[info] sbt server started at local:sbt-server-57c501e502d72a00d890
Recompile on code change (Note the ~ prefix before the compile command)
sbt:foo-build> ~compile
[success] Total time: 0 s, completed Jul 6, 2019 12:01:24 PM
1. Waiting for source changes in project foo-build... (press enter to interrupt)
Create a source file
Leave the previous command running. From a different shell or in your file manager create in the project directory the following nested directories: src/main/scala/example. Then, create Hello.scala in the example directory using your favorite editor as follows:
package example
object Hello extends App {
println("Hello")
}
This new file should be picked up by the running command. But it is not working on my system.
Expected Behaviour:
[info] Compiling 1 Scala source to /tmp/foo-build/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 2 s, completed May 6, 2018 3:53:42 PM
2. Waiting for source changes... (press enter to interrupt)
Here are some Information about my environment
$ java -version
java version "1.8.0_211"
Java(TM) SE Runtime Environment (build 1.8.0_211-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.211-b12, mixed mode)
$ sbt sbtVersion
[info] Loading global plugins from C:\Users\hce\.sbt\1.0\plugins
[info] Loading project definition from E:\learn\Scala\demo\foo-build\project
[info] Loading settings for project foo-build from build.sbt ...
[info] Set current project to foo-build (in build file:/E:/learn/Scala/demo/foo-build/)
[info] 1.2.8
$ systeminfo.exe | grep '^OS'
OS Name: Microsoft Windows 10 Enterprise LTSC
OS Version: 10.0.17763 N/A Build 17763
OS Manufacturer: Microsoft Corporation
OS Configuration: Standalone Workstation
OS Build Type: Multiprocessor Free
What I already tried:
reinstall sbt
try it with windows commad line
try it mingw64 bash
What am I missing to run the sbt ~compile command correctly?
I found the answer.
The instruction contains an error.
We are supposed to put the src/main/scala/example directory in the project directory.
From a different shell or in your file manager create in the project directory the following nested directories: src/main/scala/example.
But this leads to the problem described. foo-build/project/ is for build definition code.
If I put the src/main/scala/example directory in the foo-build directory it is working.
I should have executed the run command beforehand, which gives the 'No main class detected' error. Which in turn helped to discover, that the directory structure was incorrect by reading the following stackoverflow question: how to set main class in sbt project .
My mistake. Sorry for bothering you.
Related
I am trying CMAK on ubuntu 20.4 and I am following instruction on https://github.com/yahoo/CMAK and https://codeforgeek.com/setting-up-kafka-management-for-kafka-cluster/. After running command ./sbt clean dist and trying to switch to directory /target/ in am not seeing universal directory. Is there any thing I am missing?
Please see below screenshot.
After running: ./sbt clean dist. I am getting below result.
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master# ./sbt clean dist
[info] Loading settings for project cmak-master-build from plugins.sbt ...
[info] Loading project definition from /opt/CMAK-master/project
[info] Loading settings for project root from build.sbt ...
[info] Set current project to cmak (in build file:/opt/CMAK-master/)
[success] Total time: 1 s, completed Apr 4, 2021, 10:40:07 AM
Warning: node.js detection failed, sbt will use the Rhino based
Trireme JavaScript engine instead to run JavaScript assets compilation, which in some cases may be orders of magnitude slower than using node.js.
[info] Wrote /opt/CMAK-master/target/scala-2.12/cmak_2.12-3.0.0.5.pom
[warn] There may be incompatibilities among your library dependencies; run 'evicted' to see detailed eviction warnings.
[info] Main Scala API documentation to /opt/CMAK-master/target/scala-2.12/api...
[info] Compiling 136 Scala sources and 2 Java sources to /opt/CMAK-
master/target/scala-2.12/classes ...
model contains 640 documentable templates
[info] Main Scala API documentation successful.
[info] LESS compiling on 1 source(s)
./sbt: line 241: 7926 Killed "$#"
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master#
| => root / Web-assets / less 122s
| => root / Compile / compileIncremental 352s
After that when navigating to target directory, there is no universal directory.
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master# ls
LICENSE README.md app build.sbt conf img project public sbt
src target test
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master# cd target/
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-
master/target# ls
scala-2.12 streams web / less 122s
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master/target# ls
scala-2.12 streams web
root#ubuntu-s-1vcpu-1gb-blr1-01-testing-server:/opt/CMAK-master/target#
When I run SBT in my Scala project that contains a build.sbt file, SBT seems to ignore it and loads the project definition from a different folder and set the current project to that different directory hsperfdata which is weird because this is used as part of Java's performance counter which has nothing to do with what I'm trying to do.
Also SBT was installed via SDKMAN and when I try to specify a lower SDK version 1.2.8 instead of 1.4.6 it will always use 1.4.6. version 1.2.8 is also specified in my build.properties file as well.
My stack trace:
xxxxx#MC-N369748 topic-api % sbt
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
[info] welcome to sbt 1.4.6 (AdoptOpenJDK Java 1.8.0_275)
[info] loading project definition from /private/var/folders/hs/0vkhntfd557c8z8g8b_p7ly00000gp/T/hsperfdata_adu-tp01/project
[info] set current project to hsperfdata_adu-tp01 (in build file:/private/var/folders/hs/0vkhntfd557c8z8g8b_p7ly00000gp/T/hsperfdata_adu-tp01/)
[info] sbt server started at local:///Users/xxxxx/.sbt/1.0/server/143baa47709c908603e6/sock
[info] started sbt server
sbt:hsperfdata_xxxxx>
When we had this issue, it was caused by OS X restricting the permissions of the java executables. Since the process is not able to read/write to the current directory, sbt diverts to the tmp folder.
In System Preferences => Security & Privacy make sure the Full Disk Access property is turned on for the appropriate executables (probably java and javac in this case) or move your source code our of what OS X considers the protected part of the file system (we moved our builds from the user home directory to /code and sbt worked fine).
When running scala in sbt via runMain I have the issue that some output written via println is cut off. If I run the following code by running sbt "runMain aw.OutputTry" the output start to get cut off around at some point.
package aw
object OutputTry {
def main(args: Array[String]) {
for(i <- 1 to 5000) {
println(f"${i}")
}
}
}
Example output (I snipped the output at the '...'):
uhu01#DESKTOP-4LSJM58:~/git/spinal$ sbt "runMain aw.OutputTry"
[info] Loading settings for project spinal-build from metals.sbt,plugins.sbt ...
[info] Loading project definition from /home/uhu01/git/spinal/project
[info] Loading settings for project spinal from build.sbt ...
[info] Set current project to aw (in build file:/home/uhu01/git/spinal/)
[info] sbt server started at local:///home/uhu01/.sbt/1.0/server/771a115d7899feb4b3f3/sock
sbt:aw> runMain aw.OutputTry
[warn] Multiple main classes detected. Run 'show discoveredMainClasses' to see the list
[info] Running (fork) aw.OutputTry
[info] 1
[info] 2
[info] 3
...
[info] 963
[info] 964
[info] 965
[success] Total time: 4 s, completed Apr 13, 2020 11:15:55 PM
I assume some buffering is going on in sbt to e.g. prepend the output with the [info] tag? To me the behavior looks a bit like a buffer in sbt is not flushed after the program exists.
Things I tried:
Flushing the output in the scala code (by calling Console.flush() in the loop, after println) - does not help
In the sbt documentation I could find the setting logBuffered, I checked this and it's already set to false
Pipe the output of the sbt call to a file - then all lines are visible as expected
Calling Thread.sleep(1000) before exiting only moves the problem, and would not be a solution in any case
I first suspected my environment (shell, etc.) but running the code directly in a scala REPL works as expected
Is there some sbt setting that I did overlook during my search? Any tips how to get shown the full output?
Environment: I'm using sbt 1.2.7, Scala 2.11.12 and openjdk 1.8.0_424 on Ubuntu 18.04 in WSL
sbt 1.2.7 is a pretty old version. Try 1.3.9 (latest as of April 2020).
(And remember that in order to keep builds reproducible, your sbt version is determined by your project/build.properties file, not by what you have installed.)
Instructions for the course say to use verion 0.13.x.
I installed the latest msi from the sbt site, but when I type "sbt about", I get:
Microsoft Windows [Version 10.0.15063]
(c) 2017 Microsoft Corporation. All rights reserved.
C:\Users\reall>sbt about
Error: Unable to access jarfile
Copying runtime jar.
The filename, directory name, or volume label syntax is incorrect.
Error: Unable to access jarfile
"C:\Users\reall\.sbt\preloaded\org.scala-sbt\sbt\"1.0.2"\jars\sbt.jar"
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
[info] Loading project definition from C:\Users\reall\project
[info] Set current project to reall (in build file:/C:/Users/reall/)
[info] This is sbt 1.0.2
[info] The current project is {file:/C:/Users/reall/}reall 0.1-SNAPSHOT
[info] The current project is built against Scala 2.12.3
[info] Available Plugins: sbt.plugins.IvyPlugin, sbt.plugins.JvmPlugin, sbt.plugins.CorePlugin, sbt.plugins.JUnitXmlReportPlugin, sbt.plugins.Giter8TemplatePlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.12.3
i.e., a jar file error and the sbt version 1.0.2.
Any idea what I'm doing wrong?
You are not doing anything wrong, it's just that the required version 0.13.x is not the latest anymore. So you can either follow #dmytro-mitin's answer and reinstall sbt, or you can still use the one you already have: what you installed now is the sbt launcher, it can be used to run different versions of sbt depending on a project. So it's not important which launcher version you are using (unless you're working on something very sbt-specific).
Normally, every sbt project has a project/build.properties file with the sbt version that is needed to work with it:
sbt.version=0.13.16
So you can change (or create) this file and when you run sbt in the project root folder, it will launch sbt version 0.13.16.
Another way to launch specific version of sbt is to run it with the -sbt-version option :
sbt -sbt-version 0.13.16
or using -D flag:
sbt -Dsbt.version=0.13.16
which has exactly the same effect as editing project/build.properties.
Install not the latest version. The latest one is 1.0.2.
Install 0.13.16.
You can download it here: http://www.scala-sbt.org/download.html
There are msi and zip files.
Installing sbt on Windows
I have imported the Twitter Cassovary into Eclipse form Git Hub but not sure how to run the examples.Please advise as I am new to eclipse as well as scala
I imported the project, opened a benchmark (cassovary-benchmarks/src/main/java/GraphGenerationBenchmarks) and used Run as->Scala application.
You can also do this from the command line. Start sbt in the main project directory, choose subproject cassovary-benchmarks and then use run. You will be asked which benchmark to run.
➜ twitter-cassovary git:(master) ✗ ls
README.md cassovary-examples project
cassovary-benchmarks cassovary-server sbt
cassovary-core lib_managed target
➜ twitter-cassovary git:(master) ✗ sbt
Loading /Users/szymon/bin/sbt-launch-lib.bash
[info] Loading global plugins from /Users/szymonmatejczyk/.sbt/0.13/plugins
[info] Loading project definition from /Users/szymon/oss/twitter-cassovary/project
[info] Set current project to cassovary (in build file:/Users/szymon/oss/twitter-cassovary/)
> project cassovary-benchmarks
[info] Set current project to cassovary-benchmarks (in build file:/Users/szymon/oss/twitter-cassovary/)
> run
[info] Compiling 12 Scala sources to /Users/szymon/oss/twitter-cassovary/cassovary-core/target/scala-2.11/classes...
[info] Compiling 56 Scala sources to /Users/szymon/oss/twitter-cassovary/cassovary-core/target/scala-2.11/classes...
[info] Compiling 2 Scala sources to /Users/szymon/oss/twitter-cassovary/cassovary- benchmarks/target/scala-2.11/classes...
[warn] Multiple main classes detected. Run 'show discoveredMainClasses' to see the list
Multiple main classes detected, select one to run:
[1] com.twitter.cassovary.PerformanceBenchmark
[2] com.twitter.cassovary.SubsetSamplingBenchmarks
[3] com.twitter.cassovary.GraphGenerationBenchmarks
[4] com.twitter.cassovary.utils.FastUtilsWrappingBenchmark
Enter number: