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‎README.md

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# SpringBootPythonTest
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# SpringBootPythonTest
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This is a spring boot project without an embedded tomcat.
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So, to run the project, this needs to deployed over a external tomcat.
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E.g. :
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- Can be deployed to standalone tomcat installed in os
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- Can be copied to Tomcat based docker image and run the image for bringing up the application
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Resources :
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api.py - A python script to expose a api using Flask
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pyStart.py - python script to log data to log file and launch perm.sh
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perm.sh - shell script to set the port of tomcat to 8888, assign executable permissions to pyStart.py script, run api.py using nohup to run it in background
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nohup.out - Automatically generated, whenever nohup is invoked
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helloApi-0.0.1-SNAPSHOT.jar - An simple spring boot application which exposes an helloWorld api
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Imp points :
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The Main Application extends SpringBootServletInitializer class and overrides configure method, so that this application can be deployed over external tomcat as war
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Init Method in main class is to launch scripts inside docker image
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‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.2.1.RELEASE</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.sky</groupId>
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<artifactId>test1</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>war</packaging>
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<name>test1</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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<exclusions>
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<exclusion>
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<groupId>org.junit.vintage</groupId>
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<artifactId>junit-vintage-engine</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-exec</artifactId>
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<version>1.3</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-tomcat</artifactId>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎pythonExecution.log

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2019-12-03 23:44:06,409 Inside init.....
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2019-12-03 23:44:06,410 2019-12-03 23:44:06.409985

‎src/.DS_Store

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‎src/main/.DS_Store

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‎src/main/java/.DS_Store

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‎src/main/java/com/.DS_Store

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‎src/main/java/com/sky/.DS_Store

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‎src/main/java/com/sky/test1/Test1Application.java

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package com.sky.test1;
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import com.sky.test1.controller.Test1Controller;
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import org.apache.commons.exec.CommandLine;
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import org.apache.commons.exec.DefaultExecutor;
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import org.apache.commons.exec.ExecuteException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.boot.builder.SpringApplicationBuilder;
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import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
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import javax.annotation.PostConstruct;
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStreamReader;
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/*
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* Application to invoke python script from Java
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* */
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@SpringBootApplication
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public class Test1Application extends SpringBootServletInitializer {
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private static final Logger logger = LoggerFactory.getLogger(Test1Controller.class);
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private static Process p = null;
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public static void main(String[] args) {
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SpringApplication.run(Test1Application.class, args);
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}
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@Override
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protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
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return builder.sources(Test1Application.class);
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}
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/*@PostConstruct
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public void init() throws IOException {
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logger.info("Test1Application - Inside Post Construct");
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System.out.println("Inside post construct \n Application started, now invoking python script");
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logger.info("Test1Application - Application started, now invoking python script.......");
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if(p == null) {
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ClassLoader classLoader = getClass().getClassLoader();
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File file = new File(classLoader.getResource("api.py").getFile());
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String fileName = file.getAbsolutePath();
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logger.info("Test1Application - "+fileName);
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String[] cmd = {
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"/bin/bash",
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"-c",
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"python3 "+ fileName
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};
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p = Runtime.getRuntime().exec(cmd);
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//p.waitFor();
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}
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else
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logger.info("TestApplication Python process already running...");
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logger.info("Test1Application - After invoking python script.......\n Exiting Post Construct");
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}*/
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/*@PostConstruct
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public void init() throws IOException, InterruptedException {
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logger.info("Test1Application - Inside Post Construct");
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System.out.println("Inside post construct \n Application started, now invoking python script");
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logger.info("Test1Application - Application started, now invoking python script.......");
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if(p == null) {
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ClassLoader classLoader = getClass().getClassLoader();
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*//*File file = new File(classLoader.getResource("api.py").getFile());
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String fileName = file.getAbsolutePath();
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logger.info("Test1Application - "+fileName);*//*
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File file2 = new File(classLoader.getResource("perm.sh").getFile());
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File parentDir = file2.getParentFile();
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System.out.println(parentDir);
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String initFileName = file2.getAbsolutePath();
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logger.info("Test1Application - "+initFileName);
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String[] cmd = {
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"/bin/bash",
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"-c",
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"cd "+parentDir,
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"./ "+initFileName
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};
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//String cmd = "python3 "+initFileName;
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p = Runtime.getRuntime().exec(cmd);
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p.waitFor();
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String line;
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BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
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while ((line = input.readLine()) != null) {
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System.out.println(line);
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}
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input.close();
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}
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else
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logger.info("TestApplication Python process already running...");
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logger.info("Test1Application - After invoking python script.......\n Exiting Post Construct");
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}*/
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/*@PostConstruct
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public void init() throws IOException, InterruptedException {
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logger.info("Test1Application - Inside Post Construct");
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System.out.println("Inside post construct \n Application started, now invoking python script");
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logger.info("Test1Application - Application started, now invoking python script.......");
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if(p == null) {
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ClassLoader classLoader = getClass().getClassLoader();
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*//*File file = new File(classLoader.getResource("api.py").getFile());
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String fileName = file.getAbsolutePath();
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logger.info("Test1Application - "+fileName);*//*
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File file2 = new File(classLoader.getResource("api.py").getFile());
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File parentDir = file2.getParentFile();
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System.out.println(parentDir);
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String initFileName = file2.getAbsolutePath();
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logger.info("Test1Application - "+initFileName);
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ProcessBuilder processBuilder = new ProcessBuilder();
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//processBuilder.command("bash", "-c", "ls /Users/sky/");
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processBuilder.command("bash", "-c", "python3 "+initFileName);
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try {
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Process process = processBuilder.start();
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StringBuilder output = new StringBuilder();
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BufferedReader reader = new BufferedReader(
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new InputStreamReader(process.getInputStream()));
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String line;
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while ((line = reader.readLine()) != null) {
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output.append(line + "\n");
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}
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int exitVal = process.waitFor();
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if (exitVal == 0) {
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System.out.println("Success!");
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System.out.println(output);
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System.exit(0);
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} else {
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System.out.println("abnormal......");
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}
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} catch (IOException e) {
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e.printStackTrace();
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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else
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logger.info("TestApplication Python process already running...");
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logger.info("Test1Application - After invoking python script.......\n Exiting Post Construct");
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}*/
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@PostConstruct
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public void init() {
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logger.info("Test1Application - Inside Post Construct");
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System.out.println("Inside post construct \n Application started, now invoking python script");
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logger.info("Test1Application - Application started, now invoking python script.......");
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if(p == null) {
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ClassLoader classLoader = getClass().getClassLoader();
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/*File file = new File(classLoader.getResource("api.py").getFile());
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String fileName = file.getAbsolutePath();
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logger.info("Test1Application - "+fileName);*/
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File file2 = new File(classLoader.getResource("perm.sh").getFile());
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File parentDir = file2.getParentFile();
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System.out.println(parentDir);
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String initFileName = file2.getAbsolutePath();
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logger.info("Test1Application - "+initFileName);
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String sCommandString = "sh "+initFileName;
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CommandLine oCmdLine = CommandLine.parse(sCommandString);
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DefaultExecutor oDefaultExecutor = new DefaultExecutor();
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oDefaultExecutor.setExitValue(0);
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Thread commandLineThread = new Thread(() -> {
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try {
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int iExitValue = oDefaultExecutor.execute(oCmdLine);
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System.out.println("-------" + iExitValue);
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} catch (ExecuteException e) {
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System.err.println("Execution failed.");
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e.printStackTrace();
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} catch (IOException e) {
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System.err.println("permission denied.");
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e.printStackTrace();
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}
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});
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commandLineThread.setDaemon(true);
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commandLineThread.start();
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}
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else
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logger.info("TestApplication Python process already running...");
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logger.info("Test1Application - After invoking python script.......\n Exiting Post Construct");
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}
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}

‎src/main/java/com/sky/test1/controller/Test1Controller.java

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package com.sky.test1.controller;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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@RequestMapping("/")
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public class Test1Controller {
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private static final Logger logger = LoggerFactory.getLogger(Test1Controller.class);
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@GetMapping("/hello")
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public String helloWorld() {
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System.out.println("hello invoked");
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logger.info("Test1Controller - hello invoked");
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return "Hello World";
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}
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}

‎src/main/resources/.DS_Store

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‎src/main/resources/api.py

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from flask import Flask
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app = Flask(__name__)
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@app.route("/")
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def hello():
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print("inside python hello")
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return "Python Api is running..."
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app.run()
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‎src/main/resources/application.properties

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logging.file=${catalina.home}logs/application.log

‎src/main/resources/helloApi-0.0.1-SNAPSHOT.jar

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‎src/main/resources/nohup.out

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* Serving Flask app "api" (lazy loading)
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* Environment: production
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WARNING: This is a development server. Do not use it in a production deployment.
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Use a production WSGI server instead.
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* Debug mode: off
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Traceback (most recent call last):
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File "/Users/sky/Desktop/tomcat/apache-tomcat-8.5.49/webapps/test1-0.0.1-SNAPSHOT/WEB-INF/classes/api.py", line 12, in <module>
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app.run()
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/flask/app.py", line 990, in run
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run_simple(host, port, self, **options)
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/werkzeug/serving.py", line 1010, in run_simple
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inner()
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/werkzeug/serving.py", line 954, in inner
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srv = make_server(
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/werkzeug/serving.py", line 805, in make_server
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return ThreadedWSGIServer(
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/werkzeug/serving.py", line 699, in __init__
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HTTPServer.__init__(self, server_address, handler)
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/socketserver.py", line 452, in __init__
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self.server_bind()
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/http/server.py", line 137, in server_bind
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socketserver.TCPServer.server_bind(self)
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File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/socketserver.py", line 466, in server_bind
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self.socket.bind(self.server_address)
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OSError: [Errno 48] Address already in use

‎src/main/resources/perm.sh

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#!/bin/sh
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echo "perm start"
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java -Dserver.port=8888 -jar /Users/sky/Desktop/tomcat/apache-tomcat-8.5.49/webapps/test1-0.0.1-SNAPSHOT/WEB-INF/classes/helloApi-0.0.1-SNAPSHOT.jar
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chmod 777 /Users/sky/Desktop/tomcat/apache-tomcat-8.5.49/webapps/test1-0.0.1-SNAPSHOT/WEB-INF/classes/pyStart.py
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nohup python3 /Users/sky/Desktop/tomcat/apache-tomcat-8.5.49/webapps/test1-0.0.1-SNAPSHOT/WEB-INF/classes/api.py
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echo "perm end"

‎src/main/resources/pyStart.py

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import subprocess
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import os
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from datetime import datetime
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import logging
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import shlex
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# Create and configure logger
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logging.basicConfig(filename="pythonExecution.log",
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format='%(asctime)s %(message)s',
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filemode='w')
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# Creating an object
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logger = logging.getLogger()
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# Setting the threshold of logger to DEBUG
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logger.setLevel(logging.INFO)
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logger.info("Inside init.....")
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logger.info(datetime.now())
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os.chmod("/Users/sky/Desktop/java_code/test1/target/classes/perm.sh", 0o775)
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subprocess.call(shlex.split('sh perm.sh'))
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#subprocess.call('./run_cmd.sh')
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logger.info("End of init script")

‎src/main/resources/pythonExecution.log

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2019-12-04 23:18:14,127 Inside init.....
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2019-12-04 23:18:14,127 2019-12-04 23:18:14.127521
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2019-12-04 23:18:14,423 End of init script

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