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___
### Question
When i run ./mvnw clean package -DskipTests=true

[ERROR] Failed to execute goal 
com.github.eirslett:frontend-maven-plugin:1.6:install-node-and-npm (install 
node and npm) on project apm-webapp: Execution install node and npm of goal 
com.github.eirslett:frontend-maven-plugin:1.6:install-node-and-npm failed: A 
required class was missing while executing 
com.github.eirslett:frontend-maven-plugin:1.6:install-node-and-npm: 
org/apache/http/protocol/HttpContext
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>com.github.eirslett:frontend-maven-plugin:1.6
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = 
file:/Users/shuvigoss/.m2/repository/com/github/eirslett/frontend-maven-plugin/1.6/frontend-maven-plugin-1.6.jar
[ERROR] urls[1] = 
file:/Users/shuvigoss/.m2/repository/com/github/eirslett/frontend-plugin-core/1.6/frontend-plugin-core-1.6.jar
[ERROR] urls[2] = 
file:/Users/shuvigoss/.m2/repository/org/codehaus/jackson/jackson-mapper-asl/1.9.13/jackson-mapper-asl-1.9.13.jar
[ERROR] urls[3] = 
file:/Users/shuvigoss/.m2/repository/org/codehaus/jackson/jackson-core-asl/1.9.13/jackson-core-asl-1.9.13.jar
[ERROR] urls[4] = 
file:/Users/shuvigoss/.m2/repository/org/apache/commons/commons-compress/1.5/commons-compress-1.5.jar
[ERROR] urls[5] = 
file:/Users/shuvigoss/.m2/repository/org/tukaani/xz/1.2/xz-1.2.jar
[ERROR] urls[6] = 
file:/Users/shuvigoss/.m2/repository/commons-io/commons-io/1.3.2/commons-io-1.3.2.jar
[ERROR] urls[7] = 
file:/Users/shuvigoss/.m2/repository/org/apache/commons/commons-exec/1.3/commons-exec-1.3.jar
[ERROR] urls[8] = 
file:/Users/shuvigoss/.m2/repository/org/apache/httpcomponents/httpclient/4.5.1/httpclient-4.5.1.jar
[ERROR] urls[9] = 
file:/Users/shuvigoss/.m2/repository/org/codehaus/plexus/plexus-utils/3.0.22/plexus-utils-3.0.22.jar
[ERROR] urls[10] = 
file:/Users/shuvigoss/.m2/repository/javax/enterprise/cdi-api/1.0/cdi-api-1.0.jar
[ERROR] urls[11] = 
file:/Users/shuvigoss/.m2/repository/com/google/guava/guava/10.0.1/guava-10.0.1.jar
[ERROR] urls[12] = 
file:/Users/shuvigoss/.m2/repository/com/google/code/findbugs/jsr305/1.3.9/jsr305-1.3.9.jar
[ERROR] urls[13] = 
file:/Users/shuvigoss/.m2/repository/org/sonatype/sisu/sisu-guice/3.1.0/sisu-guice-3.1.0-no_aop.jar
[ERROR] urls[14] = 
file:/Users/shuvigoss/.m2/repository/aopalliance/aopalliance/1.0/aopalliance-1.0.jar
[ERROR] urls[15] = 
file:/Users/shuvigoss/.m2/repository/org/eclipse/sisu/org.eclipse.sisu.inject/0.0.0.M2a/org.eclipse.sisu.inject-0.0.0.M2a.jar
[ERROR] urls[16] = 
file:/Users/shuvigoss/.m2/repository/asm/asm/3.3.1/asm-3.3.1.jar
[ERROR] urls[17] = 
file:/Users/shuvigoss/.m2/repository/org/codehaus/plexus/plexus-component-annotations/1.5.5/plexus-component-annotations-1.5.5.jar
[ERROR] urls[18] = 
file:/Users/shuvigoss/.m2/repository/org/apache/maven/plugin-tools/maven-plugin-annotations/3.2/maven-plugin-annotations-3.2.jar
[ERROR] urls[19] = 
file:/Users/shuvigoss/.m2/repository/org/sonatype/plexus/plexus-build-api/0.0.7/plexus-build-api-0.0.7.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
[ERROR] 
[ERROR] -----------------------------------------------------
[ERROR] : org.apache.http.protocol.HttpContext
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e 
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please 
read the following articles:
[ERROR] [Help 1] 
http://cwiki.apache.org/confluence/display/MAVEN/PluginContainerException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :apm-webapp


shuvigoss@WeideMacBook-Pro:~/Documents/own/projects/java/incubator-skywalking 
(5.x*%=) % echo $JAVA_HOME
/Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk/Contents/Home

shuvigoss@WeideMacBook-Pro:~/Documents/own/projects/java/incubator-skywalking 
(5.x*%=) % node  -v   
v9.11.1

shuvigoss@WeideMacBook-Pro:~/Documents/own/projects/java/incubator-skywalking 
(5.x*%=) % npm -v     
5.6.0

how to fix this problem ?

[ Full content available at: 
https://github.com/apache/incubator-skywalking/issues/1621 ]
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