Lakhvir Singh Sohal created ZEPPELIN-5482:
---------------------------------------------
Summary: Run paragraph from another using z.run() throws a null
pointer exception
Key: ZEPPELIN-5482
URL: https://issues.apache.org/jira/browse/ZEPPELIN-5482
Project: Zeppelin
Issue Type: Bug
Components: zeppelin-client, zeppelin-interpreter, zeppelin-server,
zeppelin-web, zeppelin-zengine
Affects Versions: 0.9.0
Environment: * Windows 10 64 bit.
* Zeppelin version 0.9.0
* Python 3.6.7
* Java jdk 11.0.1
Reporter: Lakhvir Singh Sohal
I am having a few issues with Apache Zeppelin, specifically how to invoke a
paragraph from another. I am using Zeppelin Version 0.9.0 with the Python
interpreter.
The aim of what I am trying to achieve is to have some paragraph with a drop
down of dates, and when the user selects a date, I want to run some other
paragraphs. This is so that the user does not need to select a date in every
single paragraph. With the date, I will locate some files and present them in
tables/charts.
Looking at the documentation, it suggests we can use z.run() with the given
note id and paragraph id. Unfortunately when I do this, I keep getting an error.
Here is a minimum example of what I am trying:
{code:java}
# Cell 1 - Create select box, allow user selection, then trigger Cell 2
user_choice = z.select("f2", [("o1","1"), ("o2","2")], "o1") z.run('2GBQ57B2K',
'paragraph_1627463517803_1716289354')
{code}
{code:java}
# Cell 2 - Triggered as user made a choice in Cell 1.
print(user_choice)
print('lemon'){code}
This results in an error in Cell 1. Please see the log below:
{code:java}
Py4JJavaError: An error occurred while calling o1.run.
: java.lang.NullPointerException
at
org.apache.zeppelin.interpreter.ZeppelinContext.run(ZeppelinContext.java:497)
at
org.apache.zeppelin.interpreter.ZeppelinContext.run(ZeppelinContext.java:475)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
at py4j.Gateway.invoke(Gateway.java:282)
at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
at py4j.commands.CallCommand.execute(CallCommand.java:79)
at py4j.GatewayConnection.run(GatewayConnection.java:238)
at java.lang.Thread.run(Thread.java:745)
(<class 'py4j.protocol.Py4JJavaError'>, Py4JJavaError('An error occurred while
calling o1.run.\n', JavaObject id=o24), <traceback object at 0x7facaea7d7c8>)
{code}
Has anyone encountered this before? Or any thoughts on what could be going
wrong? I have not been able to find anything online. For what it's worth,
z.runNote() works but it runs everything. I hope to only run a subset of
paragraphs ids.
Many thanks
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
