scala Ide Not identifying my class as main method - macos

Question

I have researched some answers in Stackoverflow but my error seems to be different. Having said that i am a newbie in scala hence please consider that as well.
I am trying to create multi class project in scala. Project Format is like this
Test Project
|
COM Package
|
|-->App.class
|
COM.Test Package
|
|-->App1.class
Code Snippet
App.scala
object App {
def main(args : Array[String]): Unit = {
var logger = Logger.getLogger(this.getClass())
if (args.length < 3) {
logger.error("=> wrong parameters number")
System.err.println("Usage: MainExample <path-to-files> <srcCode> <tableName>")
System.exit(1)
}
println("In Main Class")
}
App1.scala
object App1 {
def main(args : Array[String]): Unit = {
println("In Sub Class")
}
Pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com</groupId>
<artifactId>test</artifactId>
<version>1.0.0</version>
<name>${project.artifactId}</name>
<description>My wonderfull scala app</description>
<inceptionYear>2015</inceptionYear>
<licenses>
<license>
<name>My License</name>
<url>http://....</url>
<distribution>repo</distribution>
</license>
</licenses>
<properties>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<encoding>UTF-8</encoding>
<scala.version>2.10.4</scala.version>
<scala.compat.version>2.10.4</scala.compat.version>
</properties>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<!-- >testSourceDirectory>src/test/scala</testSourceDirectory -->
<!-- plugins>
<plugin>
<see http://davidb.github.com/scala-maven-plugin >
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<args>
<arg>-make:transitive</arg>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>
</plugins -->
</build>
</project>
I am using SCALA IDE along with Scala Maven Plugin. I have commented out the build plugin but it doen=s not make a difference if that is turned on as well.
Two Issues i am facing
Issue 1) I am unable to Run App1.scala in Sub Package COM.Test. App.scala is run without issue from Run As -->Scala Application. But when ever i try to run App1.scala the scala side is not able to find Main Class
Issue 2) I am unable to debug my code for App.scala in scala ide. Whenever i run Debug Command (Bug Operator) the breakpoints are skipped and code executes entirely. I use Scala JVM Launcher and checked The option Stop in Main. Please help
Using Eclipse Luna with Scala IDE and MAC OS

Answer 1

Package structure must correspond to directory structure in the IDE. (This is unlike scalac.)
It's hard to tell from the info you present, but I can confirm that Scala IDE (on Eclipse Luna) will not offer "Run As > Scala application" if I remove the package declaration.
For example, if the class App in directory src/p/ (source file src/p/App.scala) is not in package p, then it won't offer to run it.
Uncommenting the correct package declaration gets the run as menu back.
I can also verify that a debug config with stop in main and Scala JVM launcher works as expected for App in the default package as well as in a named package. So I don't know how that could have broken for you.

Answer 2

You need to add extends App to your main objects.
object App extends App {
def main(args : Array[String]): Unit = {
var logger = Logger.getLogger(this.getClass())
if (args.length < 3) {
logger.error("=> wrong parameters number")
System.err.println("Usage: MainExample <path-to-files> <srcCode> <tableName>")
System.exit(1)
}
println("In Main Class")
}