JVM -ea parameter ignored in Intellij - scala

I'm working on a Scala project in IntelliJ. I'm trying to use Predef.assert.
Given the following code :
test("TEST"){
try{
Predef.assert(0 == 1,"test")
}
catch{
case e :AssertionError => println("Catch")
}
println("End")
}
I create a configuration in IntelliJ with the VM option : -ea
I expect to have Catchand Endwritten in the console, but it outputs only End
The assertion is ignored, even if I enable it in the VM options of the current configuration of IntelliJ. Is there anyone who has experienced this ?
I can even see in the IntelliJ console that the parameter has been added :
"C:\Program Files\Java\jdk1.8.0_144\bin\java.exe" -ea "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2018.1.5\lib ...
How do I enable the assertions properly ?


Instead of starting IntelliJ itself with the VM option, you have to configure it to run your program with the appropriate options.
Open the run configuration of your project and add the options as shown in the following Screenshots:


Okay, after being confronted to the fact that it works with a new project (only myself to blame here, always start from scratch, as per MCVE) I started digging, and the fact is, a parameter was still laying in the file .idea/scala_compiler
I had to remove
<parameter value="-Xdisable-assertions" />
Which obviously overtook the VM parameters.

Related

Eclipse run error

When i try to run my code on Eclipse this error appears:
Usage: javaw [-options] class [args...]
(to execute a class)
or javaw [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-server to select the "server" VM
-hotspot is a synonym for the "server" VM [deprecated]
The default VM is server.
-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 | -no-jre-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 with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
See http://www.oracle.com/technetwork/java/javase/documentation/index.html for more details.
i try to coment my entired code and this error still appear.

It seems you haven't set your java path correctly.
Setting Up Eclipse with Java 1.6 on Windows
How To Install and Get Started with Java Programming

Run eclipse in clean mode
Edit the eclipse.ini file located in your Eclipse install directory and insert -clean as the first line.

If this is happening to a specific project only and other projects are running fine then your default run configuration might have changed. You may try the following
- Run -> Run As -> 1 Java Application.

I fixed this issue by deleting some of my old runtime configurations. Eclipse then started automatically generating them again.

Error running ensime-source-buffer-loaded-hook - OSX with ENSIME and Emacs

I get the following error when trying to start ENSIME on OSX through Emacs
Error running ensime-source-buffer-loaded-hook
I am following the instructions from the github source page
Scala Mode is Working
ENSIME Server appears to be installed, is there any way to verify this?
The sbt plugin is installed and I have a .ensime config file generated
Starting Emacs gives me the above error. When I manually try M-x ensime I get the following:
Failed to connect to Swank: server process exited.

Okay, here's how I solved it:
Locate the ensime folder and run bin/server /tmp/ensime.port.
I got the error:
java -classpath ... org.ensime.server.Server ./port
Unrecognized VM option '+DoEscapeAnalysis'
Could not create the Java virtual machine.
I have no idea what DoEscapeAnalysis is for, but I tried deleting it from bin/server and now everything seems to work.
See here: https://gist.github.com/2300737

For my case on Windows 7, with the same error message, but the root cause was the original setting for the maximum heap size -Xmx1512M was too large, I had to change to -Xmx768M to get over the error message.
I had also removed the byte compiled elisp code, and restart to avoid another error of
"call time out".

I also had this error on linux with emacs 24.3.1 and resolved it by specifying the full path to java in bin/server.

strange behaviour of the Eclipse

I have some problems with Eclipse:
Sometimes I write the code and compile it and all works perfectly, after I begin to change my code and compile one more time, but Eclipse does nothing.
Only after I delete the folder Debug it compiles the program
My question is why? And how can I switch the behaviour to compile every time from the beginning.
For example:
if(x == 0) # ... I compile, and it works...
# after I do one change to my code
if(x==0 && y==0) # ... Eclipse do nothing even if y is not declared

I suppose you are talking about a CDT project (C/C++), not a JDT one (Java).
If so, not that if you delete the debug folder, you cannot run directly the application (bug 296243).
Check if the 'Build (Build Incremental)' is disabled or not: bug 198097.

Scala project won't compile in Eclipse; "Could not find the main class."

I have installed Eclipse 3.5.2 and today's Scala plugin from /update-current (that's Scala 2.8 final.) I can compile and run Scala projects consisting of a single singleton object that implements main().
But, if a project contains more classes, I receive the "Could not find the main class" error.
I have tried searching for the solution and I discovered:
Eclipse is correctly looking for the Main$ class, not the Main class
* under Debug Configurations, my main class is correctly identified as mypackage.Main
* my plugin is up to date and recommended for my version of Eclipse
* cleaning, restarting etc. doesn't help.
The same project will compile with scalac.
Thanks for any ideas on how to solve this.
EDIT: MatthieuF suggested I should post the code.
This snippet produces an error. It's not the most idiomatic code, but I wrote it that way to test my environment. I tried it as a single file and as separate files. It DOES work with scalac.
import swing._
class HelloFrame extends Frame {
title = "First program"
contents = new Label("Hello, world!")
}
object Hello {
val frame = new HelloFrame
def main(args : Array[String]) : Unit = {
frame.visible = true
}
}
BUT, if I nest the definition of HelloFrame within Hello, it works. This snippet runs perfectly:
import swing._
object Hello {
class HelloFrame extends Frame {
title = "First program"
contents = new Label("Hello, world!")
}
val frame = new HelloFrame
def main(args : Array[String]) : Unit = {
frame.visible = true
}
}

For me, the problem was that there was a build error (see Problems tab) which was preventing compilation; oops! The reason you see the error is that the run macro proceeds despite the failed compilation step, and attempts to run class files it expects to be there; they don't exist because there was a build error preventing compilation, so it says it can't find Main (not compiled).
Problem goes away when build can complete successfully, i.e. errors are fixed.
I guess, theoretically, there may be more complicated reasons your build is not completing successfully that are not listed in Problems.

One possibility is that you are trying to launch using ctrl-F11, but from a different class.
The Scala Eclipse plugin does not obey the defaults for Java launching. In Preferences->Run/Debug->Launching, there are some options Launch Operation->Always Launch the previously selected application, etc. This currently does not work in the Scala eclipse plugin. To launch a specified main, you need to launch it from the editor for the class.
There has been a bug raised for this. http://scala-ide.assembla.com/spaces/scala-ide/tickets/1000023-scala-launch--does-not-follow-jdt-behaviour
EDIT: This is now (mostly) fixed.

For me it was Eclipse specific problem. I noticed that .class file wasn't built at all. So bin directory doesn't have compiled classes.
When I manually compiled *.scala file using *.sbt and copied it to bin directory it was working as expected.
I tried different tips and tricks and it wasn't worked until I reinstalled Scala plugin in Eclipse .

I'd solve similar problem by executig "Project->Clean.." with next automatically building.

I had the same error message with a Java application made by myself.
The problem was that I deleted (though inside Eclipse) a jar that belonged to the Java build path, without deleting it from the Java build path (project's Properties window). When I did it the class could compile and run again.

Make sure that the .class files exist, usually below the bin directory.
In particular, if you have errors in unrelated files in the same project then the compilation may fail, and no .class files will be produced.

There can be the case of projects, containing errors, added to the build path of the application which prevents the completion of successful compilation. Make sure you remove any such project from the build path before running the application.
Removing these projects solved the problem for me.

Do you have a proper build tool setup? Like sbt have you installed it?
You can check its version by $sbt --version
If it is not setup you can download from here http://www.scala-sbt.org/download.html
You might have to restart your eclipse after installation.

Just copy your XXX.scala file code. Remove the package and create a new Scala Class. Paste your XXX.scala code. (If you are using maven, do a maven clean and build.) Run configuration again. This works for me.

I have faced this issue. I have just deleted the package name, created scala class, Written the same code, Set Build to "Build Automatically". Finally, It works perfectly fine.

Check scala-ide.log
For me the issue was that there were errors on:
AppData\Local\Temp\sbt_10d322fb\xsbt\ClassName.scala:16: error: not found: value enteringPhase
enteringPhase(currentRun.flattenPhase.next) { s fullName separator }

If you are using Intellij, mark directory as source root

GWT Junit - error='no compilation unit for that type was seen'

I'm trying to run a GWT unit test in a sample app. I ran
cmd /c /java/gwt-windows-1.6.4/webAppCreator.cmd -out gwttasks com.gwttasks.GwtTasks
Copied in junit-4.5.jar into a lib directory, and added that to the classpath.
Ran:
cmd /c /java/gwt-windows-1.6.4/junitCreator.cmd -junit lib/junit-4.5.jar -module com.gwttasks.GwtTasks -eclipse GwtTasks com.gwt
tasks.unit.GwtJunit
When I try to run any of the generated cmd file (such as GwtJunit-hosted.cmd) or any of the launch files, I get the following error. All the web pages I've seen say to add the test source to the classpath, but it's already there, so that's not the problem. Anyone else seen this?
com.google.gwt.junit.JUnitFatalLaunchException: The test class 'com.gwttasks.unit.GwtJunit' was not found in module 'com.gwttasks.GwtTasks'; no compilation unit for that type was seen
at com.google.gwt.junit.JUnitShell.checkTestClassInCurrentModule(JUnitShell.java:390)
at com.google.gwt.junit.JUnitShell.runTestImpl(JUnitShell.java:626)
...

The answer could be found here :
http://raibledesigns.com/rd/entry/testing_gwt_applications

In netbeans I added the src/java and test to the class path and debugging worked!!!!!
THANKS

I just want to add that I had the same problem, because I did the (very silly) mistake to not put the GWTTestCase class into the "client" directory, but into another one. No wonder it wasn't found ;)