Appengine maven plugin exclude node_modules - maven

Question

In my GoogleAppEngine project I currently installed a lot of node-modules that are now placed in my project at the location src/main/webapp/node_modules. Now when I try to test that project locally with the appengine-maven-plugin (mvn appengine:run), it takes up to 10 Minutes to create that project. I figured out, that it takes so much time to copy all files from the node_modules folder to the target folder.
Since I only need these files for developing, I tried to skip this folder when building the project. But I'm not that sure where to configure that behavior. In my appengine-web.xml I already excludes that folder from static-files and resource-files:
<static-files>
<include path="/build/build/favicon.ico" />
<include path="/build/build/node_modules/**" />
<include path="/build/build/images/**" />
<include path="/build/build/src/**" />
<include path="/build/build/robots.txt" />
<include path="/build/build/sitemap.xml" />
<exclude path="/node_modules/**/*" />
</static-files>
<resource-files>
<include path="/build/build/index.html" />
<exclude path="/node_modules/**/*" />
</resource-files>
Where may I exclude that folder from beeing copied to target/backend-1.0-snapshot?
I'm using the appengine standard environment (1.9.63) with the appengine-maven-plugin (1.3.2)
Here is my pom.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<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>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<groupId>com.xxx.xxx</groupId>
<artifactId>backend</artifactId>
<properties>
<endpoints.framework.version>2.0.14</endpoints.framework.version>
<endpoints.management.version>1.0.4</endpoints.management.version>
<endpoints.project.id>XXX PROJECT XXX</endpoints.project.id>
<appengine.maven.plugin.version>1.3.2</appengine.maven.plugin.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.showDeprecation>true</maven.compiler.showDeprecation>
</properties>
<prerequisites>
<maven>3.5.0</maven>
</prerequisites>
<dependencies>
<!-- Compile/runtime dependencies -->
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-framework</artifactId>
<version>${endpoints.framework.version}</version>
</dependency>
<dependency>
<groupId>com.google.endpoints</groupId>
<artifactId>endpoints-management-control-appengine-all</artifactId>
<version>1.0.7</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<type>jar</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.inject</groupId>
<artifactId>javax.inject</artifactId>
<version>1</version>
</dependency>
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>1.9.63</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>
</dependencies>
<build>
<!-- for hot reload of the web application -->
<outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
<plugins>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>appengine-maven-plugin</artifactId>
<version>${appengine.maven.plugin.version}</version>
<configuration>
<deploy.project>XXX PROJECT XXX</deploy.project>
<deploy.version>XXX VERSION XXX</deploy.version>
<deploy.stopPreviousVersion>false</deploy.stopPreviousVersion>
<deploy.promote>false</deploy.promote>
</configuration>
</plugin>
<plugin>
<groupId>com.google.cloud.tools</groupId>
<artifactId>endpoints-framework-maven-plugin</artifactId>
<version>1.0.3</version>
<configuration>
<!-- plugin configuration -->
<hostname>${endpoints.project.id}.appspot.com</hostname>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>versions-maven-plugin</artifactId>
<version>2.5</version>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>display-dependency-updates</goal>
<goal>display-plugin-updates</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Answer 1

I just found out that I have to add the maven-war-plugin with the warSourceExcludes-configuration to the build part of the pom.xml.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<warSourceExcludes>node_modules/**</warSourceExcludes>
</configuration>
</plugin>
That way the folder won't be copied to the exploded war folder.

Answer 2

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<packagingExcludes>assets/node_modules/**</packagingExcludes>
</configuration>
</plugin>
Where assets is a folder inside of src/main/webapp directory. When you run mvn install , it will create a war and source directory in your target folder. Although node_modules will be visible in source directory inside of target but when you extract war file, these will be excluded. You can see this by extracting war file.