java src path in pom.xml while there are multiple modules - maven

Question

I have a two modules project with following pom.xml files but intellij idea does not detect java files and treat them as general file, where did I make mistake?
and the pom file for module-a is
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>myproj</groupId>
<artifactId>parent</artifactId>
<version>0.4.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<artifactId>module-a</artifactId>
<name>module-a</name>
<packaging>jar</packaging>
<description>module-a</description>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
and the pom file for the module-b is
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>myproj</groupId>
<artifactId>parent</artifactId>
<version>0.4.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
<artifactId>module-b</artifactId>
<name>module-b</name>
<packaging>jar</packaging>
<description>module-b</description>
<dependencies>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<configuration>
<testFailureIgnore>true</testFailureIgnore>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
and the parent pom file is
<?xml version="1.0" encoding="UTF-8"?>
<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>myproj</groupId>
<artifactId>parent</artifactId>
<name>myproj.parent</name>
<packaging>pom</packaging>
<version>0.4.0-SNAPSHOT</version>
<scm>
<connection>scm:svn:http://localhost:7070/svn/myproj/branches/test</connection>
<developerConnection>scm:svn:http://localhost:7070/svn/myproj/branches/test</developerConnection>
</scm>
<modules>
<module>module-a</module>
<module>module-b</module>
</modules>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<configuration>
<encoding>utf-8</encoding>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
<encoding>utf-8</encoding>
<showWarnings>true</showWarnings>
<fork>true</fork>
<optimize>true</optimize>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-release-plugin</artifactId>
<version>2.2.2</version>
<configuration>
<useReleaseProfile>true</useReleaseProfile>
<releaseProfiles>complete</releaseProfiles>
<username>${username}</username>
<password>${password}</password>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<!-- Dependency(s) Versions -->
<org.slf4j>1.7.21</org.slf4j>
<kotlin.version>1.2.21</kotlin.version>
<!-- Dependency(s) Versions -->
<!-- Configurations -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<proguard.skip>true</proguard.skip>
<debug.skip>false</debug.skip>
<product.name>myproj</product.name>
</properties>
</project>

Answer 1

The default sources directory would be src/main/java. In your case, it is just src in each module.
You can include following line in each module's pom file.
<sourceDirectory>${project.build.directory}/src</sourceDirectory>
Or you can try marking each src directory as Sources Root.