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add jsp to servlet and maven project

I want to add JSP files to servlet project using Maven
Here's my pom.xml:
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>time_table</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<url>http://localhost:8085/manager/text</url>
<server>TomcatServer</server>
<path>/time</path>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.1</version>
</plugin>
</plugins>
</build>
How and where should I add JSP files?
and if I have some link to tutorials about this I'm very happy to check

alter pom file for heroku deployment

I'm trying to deploy an Eclipse jee dynamic web app to heroku. I need to modify the pom file but I'm not sure how.
Here's what I need to add but I'm not sure where to place:
<configuration>
<appName>gentle-shore-6874</appName>
</configuration>
here's the file from eclipse:
<?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>com.example</groupId>
<version>1.0-SNAPSHOT</version>
<artifactId>helloworld</artifactId>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlet</artifactId>
<version>9.4.7.v20170914</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>com.heroku.sdk</groupId>
<artifactId>heroku-maven-plugin</artifactId>
<version>2.0.7</version>
<configuration>
<buildpacks>
<buildpack>heroku/exec</buildpack>
<buildpack>heroku/metrics</buildpack>
<buildpack>heroku/jvm</buildpack>
</buildpacks>
</configuration>
</plugin>
</plugins>
</build>
</project>

<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<version>1.0-SNAPSHOT</version>
<artifactId>helloworld</artifactId>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-servlet</artifactId>
<version>9.4.7.v20170914</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>com.heroku.sdk</groupId>
<artifactId>heroku-maven-plugin</artifactId>
<version>2.0.7</version>
<configuration>
<appName>gentle-shore-6874</appName>
<buildpacks>
<buildpack>heroku/exec</buildpack>
<buildpack>heroku/metrics</buildpack>
<buildpack>heroku/jvm</buildpack>
</buildpacks>
</configuration>
</plugin>
</plugins>
</build>
</project>

Error with Spark: NoSuchMethodError: scala.Predef$.$conforms()Lscala/Predef$$less$colon$less

I've got an application which streams Twitter posts.
It worked correctly, but after modifying the build path, I didn't manage to set it how it was before. I keep getting this error:
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.$conforms()Lscala/Predef$$less$colon$less;
at org.apache.spark.util.Utils$.getSystemProperties(Utils.scala:1710)
at org.apache.spark.SparkConf.loadFromSystemProperties(SparkConf.scala:73)
at org.apache.spark.SparkConf.<init>(SparkConf.scala:68)
at org.apache.spark.SparkConf.<init>(SparkConf.scala:55)
at Analytics.init(Analytics.java:20)
at KafkaTwitterProducer.main(KafkaTwitterProducer.java:162)
This is my 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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TwitterStreamingAnalyzer</groupId>
<artifactId>TwitterStreamingAnalyzer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.10</artifactId>
<version>0.10.2.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-core -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-core</artifactId>
<version>4.0.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-stream -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-stream</artifactId>
<version>4.0.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-async -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-async</artifactId>
<version>4.0.4</version>
</dependency>
</dependencies>
</project>
I already read all of the similar questions, but none of them helped me, because I tried to import the right versions of the jars, but it still doesn't work.
How can I fix this?

Looks like you are trying to use a kafka library compiled in Scala 2.10 in a Spark cluster compiled in other version (probably 2.11). Try this change in your 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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>TwitterStreamingAnalyzer</groupId>
<artifactId>TwitterStreamingAnalyzer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.11</artifactId>
<version>0.10.2.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-core -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-core</artifactId>
<version>4.0.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-stream -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-stream</artifactId>
<version>4.0.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.twitter4j/twitter4j-async -->
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-async</artifactId>
<version>4.0.4</version>
</dependency>
</dependencies>
</project>

Maven appears to be ignoring source and target in webapp

I'm getting "Generated servlet error:|try-with-resources is not supported in -source 1.5". 1.5 is maven's default according to another question on the topic, but I thought I had fixed that in my pom.xml -
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.sspo</groupId>
<artifactId>sspo-parent</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>website</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>website</name>
<properties>
<jetty.version>9.0.5.v20130815</jetty.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.version}</version>
<dependencies>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-pool</groupId>
<artifactId>commons-pool</artifactId>
<version>1.6</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.26</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.sspso</groupId>
<artifactId>com.sspo.package1</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.sspo</groupId>
<artifactId>com.sspo.package2</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
Other packages in the project work fine with 1.7, as seen in the parent pom -
<?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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sspo</groupId>
<artifactId>sspo-parent</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<name>sspo-parent</name>
<modules>
<module>try-with-resources-works-here</module>
<module>and-here</module>
<module>even-in-this-one</module>
<module>website</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>14.0.1</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
</dependencies>
</project>
Ultimately, I think the question is probably "what have I done wrong that maven is ignoring the source and target specifications?" There are similar questions out there, but the ones I've seen are either not solved or suggest things that exist in my pom.
Any help would be appreciated.

Jetty is using 1.5 source and target args by default for JSP compilation. See Jetty embedded and JSP compilation to 1.7? for pointers and info on switching Jetty to use 1.7

Maven parent pom variables are not resolved

I have the following POM structure:
./foobar-common/pom.xml
./abc-window/pom.xml
./abc-datasource/pom.xml
Both abc-window pom.xml is as follows:
<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>hu.abc.ringcore</groupId>
<artifactId>abc-window</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>abc-window</name>
<parent>
<relativePath>../foobar-common/pom.xml</relativePath>
<groupId>hu.abc.ringcore</groupId>
<artifactId>foobar-common</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>hu.abc.ringcore</groupId>
<artifactId>abc-datasource</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
</goals>
<phase>package</phase>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
</plugins>
</build>
</project>
abc-datasource pom.xml is as follows:
<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>hu.abc.ringcore</groupId>
<artifactId>abc-datasource</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>abc-datasource</name>
<parent>
<relativePath>../foobar-common/pom.xml</relativePath>
<groupId>hu.abc.ringcore</groupId>
<artifactId>foobar-common</artifactId>
<version>1.0</version>
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>hu.abc.ringcore</groupId>
<artifactId>abc-base</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>hu.abc.ringcore</groupId>
<artifactId>abc-event</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>hu.abc.ringcore</groupId>
<artifactId>abc-variable</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>hu.abc.ringcore</groupId>
<artifactId>abc-variableintf</artifactId>
<version>${project.version}</version>
</dependency>
<dependency>
<groupId>hu.foobar.ring</groupId>
<artifactId>RateSorszamIntf</artifactId>
<version>${ringcore-services.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.2.1</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
</goals>
<phase>package</phase>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>true</downloadJavadocs>
</configuration>
</plugin>
</plugins>
</build>
The foobar-common pom.xml is as follows:
<project>
<modelVersion>4.0.0</modelVersion>
<name>Maven Default Project</name>
<groupId>hu.foobar.ringcore</groupId>
<artifactId>foobar-common</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<junit.version>4.10</junit.version>
<spring.version>3.1.2.RELEASE</spring.version>
<spring-security.version>2.0.6.RELEASE</spring-security.version>
<commons-logging.version>1.1.1</commons-logging.version>
<dom4j.version>1.6.1</dom4j.version>
<javaee-api.version>6.0</javaee-api.version>
<mycila-event.version>3.0</mycila-event.version>
<ringcore-services.version>1.3.4-SNAPSHOT</ringcore-services.version>
<commons-lang3.version>3.1</commons-lang3.version>
</properties>
</project>
My problem is that if I do an mvn install in abc-datasource the dependency versions are pulled from the parent pom properties as expected. However if I do mvn install from abc-window that references abc-datasource then the versions are not resolved, I get:
[ERROR] Failed to execute goal on project abc-window: Could not resolve dependencies for project hu.abc.ringcore:abc-window:jar:1.0-SNAPSHOT: Failed to collect dependencies for [junit:junit:jar:4.10 (test), hu.abc.ringcore:abc-datasource:jar:1.0-SNAPSHOT (compile)]: Failed to read artifact descriptor for org.apache.commons:commons-lang3:jar:${commons-lang3.version}: Could not transfer artifact org.apache.commons:commons-lang3:pom:${commons-lang3.version} from/to central (http://repo.maven.apache.org/maven2): IllegalArgumentException: Illegal character in path at index 70: http://repo.maven.apache.org/maven2/org/apache/commons/commons-lang3/${commons-lang3.version}/commons-lang3-${commons-lang3.version}.pom
Both project have the same parent pom, so why doesn't it work..?

Use dependencyManagment in parent pom
<dependencyManagement>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
add all versions in parent pom, and use dependencies without version in children
EDIT
/pom.xml <-parent pom
/abc-window/pom.xml <-child module
/abc-datasource/pom.xml <-child module
and parent pom should contains
<project
...
<properties>
...
</properties>
<modules>
<module>abc-datasource</module>
<module>abc-window</module>
</modules>
<build>
<pluginManagment>
...
</pluginManagment>
</build>
<dependencyManagment>
...
</dependencyManagment>
</project>

The parent in abc-window is listed as:
<parent>
<relativePath>../foobar-common/pom.xml</relativePath>
<groupId>hu.abc.ringcore</groupId>
<artifactId>foobar-common</artifactId>
<version>1.0</version>
</parent>
The parent in abc-datasource is listed as:
<parent>
<relativePath>../foobar-common/pom.xml</relativePath>
<groupId>hu.ratesoft.ringcore</groupId>
<artifactId>foobar-common</artifactId>
<version>1.0</version>
</parent>
So, they do not have the same groupId.