I am using Ubuntu 18.04
I run the following command
sudo apt-get install scala
This installs scala 2.11.12
but this is an outdated version. The real version of the programming language is 2.13.0
I googled and googled but everything points to very old and outdated articles.
I have a simple rest server in Scala. Run this project via intellij on localhost:8080. I tried to send POST or GET request into this server via postman and curl, but it cannot connect with it, don't know why. I pinged localhost and it answer, but localhost:8080 where the app runs only loading and nothing more. I run intellij and start my server (scala, cats, Blaze). Everything works correctly yesterday, but today it's not.
I looked into intellij logs, and they look like good:
2019-04-21 19:29:08,912 [14101080] INFO - ij.compiler.impl.CompileDriver - COMPILATION STARTED (BUILD PROCESS)
2019-04-21 19:29:08,919 [14101087] INFO - j.compiler.server.BuildManager - Using preloaded build process to compile /home/project
2019-04-21 19:29:11,565 [14103733] INFO - lij.compiler.impl.CompilerUtil - COMPILATION FINISHED (BUILD PROCESS); Errors: 0; warnings: 0 took 2662 ms: 0 min 2sec
2019-04-21 19:29:11,565 [14103733] INFO - s.CompilerReferenceServiceBase - backward reference index reader doesn't exist
2019-04-21 19:29:12,358 [14104526] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stdout]: Build process started. Classpath: /home/intellij/idea-IU-183.5912.21/lib/jps-launcher.jar:/usr/lib/jvm/java-1.11.0-openjdk-amd64/lib/tools.jar:/home/intellij/idea-IU-183.5912.21/lib/optimizedFileManager.jar
2019-04-21 19:29:12,419 [14104587] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
2019-04-21 19:29:12,419 [14104587] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: Defaulting to no-operation (NOP) logger implementation
2019-04-21 19:29:12,419 [14104587] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
2019-04-21 19:29:14,496 [14106664] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: An illegal reflective access operation has occurred
2019-04-21 19:29:14,496 [14106664] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Illegal reflective access by com.google.protobuf.UnsafeUtil (file:/home/intellij/idea-IU-183.5912.21/lib/protobuf-java-3.4.0.jar) to field java.nio.Buffer.address
2019-04-21 19:29:14,496 [14106664] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Please consider reporting this to the maintainers of com.google.protobuf.UnsafeUtil
2019-04-21 19:29:14,496 [14106664] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
2019-04-21 19:29:14,496 [14106664] INFO - j.compiler.server.BuildManager - BUILDER_PROCESS [stderr]: WARNING: All illegal access operations will be denied in a future release
Everything builds well. I don't know where the problem could be. I also tried to turn on proxy in postman but it did not help. Cleared also cache in intellij, nothing help. I'm using newest Ubuntu. Does anyone had same problem and know how to solve it? Maybe it is a stupid question but I really don't have any idea what could happend.
EDIT
I ckecked if something else using port 8080 with this command:
netstat -tulpn | grep 8080, but I only got one result:
tcp6 0 0 127.0.0.1:8080 :::*LISTEN 18125/java.
It looks like only my running app is using this port.
How to configure VIM to be able to highlight scala language (.scala files extension)?
Current VIM configuration (.vimrc file):
:syntax on
I have followed this manual to run spark on my Ubuntu 16.04. I have downloaded Spark 2.3, Java 9 and Scala 2.12.5.
In my /.bashrc:
export JAVA_HOME=/usr/local/java/jdk-9.0.1
export SPARK_HOME=/usr/bin/spark
export PATH=$PATH:SPARK_HOME/bin
export PATH=$PATH:SPARK_HOME/sbin
export SBT_HOME=/usr/bin/sbt
export PATH=$PATH:$SBT_HOME/bin
In my spark-env.sh:
JAVA_HOME=/usr/local/java/jdk-9.0.1
SPARK_MASTER_IP=10.1.20.241
SPARK_WORKER_MEMORY=4g
at the end of file.
but when I run ./spark-shell I get this error:
2018-03-28 17:17:26 WARN Utils:66 - Your hostname, ali resolves to a loopback address: 127.0.1.1; using 192.168.1.52 instead (on interface enp0s3)
2018-03-28 17:17:26 WARN Utils:66 - Set SPARK_LOCAL_IP if you need to bind to another address
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.hadoop.security.authentication.util.KerberosUtil (file:/usr/bin/spark/jars/hadoop-auth-2.6.5.jar) to method sun.security.krb5.Config.getInstance()
WARNING: Please consider reporting this to the maintainers of org.apache.hadoop.security.authentication.util.KerberosUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2018-03-28 17:17:28 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Setting default log level to "WARN".
To adjust logging level use sc.setLogLevel(newLevel). For SparkR, use setLogLevel(newLevel).
Failed to initialize compiler: object java.lang.Object in compiler mirror not found.
** Note that as of 2.8 scala does not assume use of the java classpath.
** For the old behavior pass -usejavacp to scala, or if using a Settings
** object programmatically, settings.usejavacp.value = true.
Failed to initialize compiler: object java.lang.Object in compiler mirror not found.
** Note that as of 2.8 scala does not assume use of the java classpath.
** For the old behavior pass -usejavacp to scala, or if using a Settings
** object programmatically, settings.usejavacp.value = true.
Exception in thread "main" java.lang.NullPointerException
I have installed an eclipse IDE with scala nature. And it is called the Scala-IDE from scala-ide.org.
How can I uninstall Scala IDE on ubuntu?
I know that If it is a package we can by sudo apt-get remove "package"
But since it is downloaded as tar file. And there is no such uninstall option as that of windows... So, what should I do??