zeppelin/java/README.md

Overview

Java interpreter for Apache Zeppelin

Architecture

Current interpreter implementation supports the static repl. It compiles the code in memory, execute it and redirect the output to zeppelin.

Building the Java Interpreter

You have to first build the Java interpreter by enable the java profile as follows:

mvn clean package -Pjava -DskipTests -Pscala-2.10

Technical overview

• Upon starting an interpreter, an instance of JavaCompiler is created.

• When the user runs commands with beam, the JavaParser go through the code to get a class that contains the main method.

• Then it replaces the class name with random class name to avoid overriding while compilation. It creates new out & err stream to get the data in new stream instead of the console, to redirect output to zeppelin.

• If there is any error during compilation, it can catch and redirect to zeppelin.