Null pointer exception when installing shell interpreter for zeppelin

[#1]

While trying to install the shell interpreter for zeppelin (v 0.8.0), I fail with this message:

# sudo /usr/hdp/current/zeppelin-server/bin/install-interpreter.sh --name shell
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=512m; support was removed in 8.0
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/hdp/3.0.1.0-187/zeppelin/lib/interpreter/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hdp/3.0.1.0-187/zeppelin/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/hdp/3.0.1.0-187/zeppelin/lib/slf4j-simple-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
Install shell(org.apache.zeppelin:zeppelin-shell:0.8.0) to /usr/hdp/current/zeppelin-server/interpreter/shell ... 
org.sonatype.aether.RepositoryException: Cannot fetch dependencies for org.apache.zeppelin:zeppelin-shell:0.8.0
    at org.apache.zeppelin.dep.DependencyResolver.getArtifactsWithDep(DependencyResolver.java:179)
    at org.apache.zeppelin.dep.DependencyResolver.loadFromMvn(DependencyResolver.java:128)
    at org.apache.zeppelin.dep.DependencyResolver.load(DependencyResolver.java:76)
    at org.apache.zeppelin.dep.DependencyResolver.load(DependencyResolver.java:93)
    at org.apache.zeppelin.dep.DependencyResolver.load(DependencyResolver.java:85)
    at org.apache.zeppelin.interpreter.install.InstallInterpreter.install(InstallInterpreter.java:170)
    at org.apache.zeppelin.interpreter.install.InstallInterpreter.install(InstallInterpreter.java:134)
    at org.apache.zeppelin.interpreter.install.InstallInterpreter.install(InstallInterpreter.java:126)
    at org.apache.zeppelin.interpreter.install.InstallInterpreter.main(InstallInterpreter.java:278)
Caused by: java.lang.NullPointerException
    at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:352)
    at org.apache.zeppelin.dep.DependencyResolver.getArtifactsWithDep(DependencyResolver.java:176)
    ... 8 more

I use HDP 3.0.1

[#2]

I found a workaround by installing it locally: I downloaded the JARs from Maven: https://mvnrepository.com/artifact/org.apache.zeppelin/zeppelin-shell/0.8.0 and passed it as argument artifact. This worked:

# /usr/hdp/current/zeppelin-server/bin/install-interpreter.sh --name shell --artifact /var/tmp/zeppelin-jar/zeppelin-shell-0.8.0.jar

[#3 · Accepted solution]

@Alessandro

As we see the following error while installing the SHELL interpreter.

org.sonatype.aether.RepositoryException: Cannot fetch dependencies for org.apache.zeppelin:zeppelin-shell:0.8.0
    at org.apache.zeppelin.dep.DependencyResolver.getArtifactsWithDep(DependencyResolver.java:179)
.
.
Caused by: java.lang.NullPointerException
    at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:352)

.

This can happen if you do not have internet access (or if you have soem n/w issue_ on the Zeppelin server host. Can you please isolate that?

You can also refer to the following article for similar issues: https://community.hortonworks.com/content/kbentry/84498/zeppelin-does-not-get-installed-properly-wit...

.

Basically We need to have the dependenices (jars) under "/usr/hdp/current/zeppelin-server/local-repo" and the interpreters inside the "/usr/hdp/current/zeppelin-server/interpreter/" dir if he interpreter installation is successful without internet issue.

[#4]

Thank you, indeed it was an internet issue, changing the dns resolver in "/etc/resolv.conf" worked. default was 127.0.0.11, but this kept spitting errors, changing it to 8.8.8.8 worked. not sure why though.