Ekiras

Points To Remember You cannot destroy or terminate the current process not even forcefully. You can destroy a process by using the methods destroy() or forcefully using destroyForcibly() . Read More Java 9 Feature List all processes running on the OS Get the information of the current process Start a new Process and get its Process Id How to get Process Information from Process Id Destroy a running process Destroy a Process There are two methods in interface ProcessHandle that can be used to destroy a process. destroy() - to destroy a process noramally destroyForcibly() - to destroy a process forcefully. However the process may not be terminatted instantly since operating system access controls may prevent the process from being killed thus resulting in case where isAlive() method may return true for a brief period after destroyForcibly() is called. In the example below we will first create a process and then kill it forcefully. import java.io.IOException; import java.lang.Pro...

Points to Remember You need to run this code with Java 1.9 ProcessHandle.of(Long processId) method will return an object of Optional<ProcessHandle> . Optional is a class introduced in java 8 which is a container object which may or may not contain a non-null value . It has methods boolean isPresent() which returns true if a value is present else returns false. T get() method returns the object if present or else throws NoSuchElementException . Read More Java 9 Feature List all processes running on the OS Get the information of the current process Start a new Process and get its Process Id How to get Process Information from Process Id Destroy a running process Get Process Information from Process Id If we have the process id of a process, then we can get the information about the process as shown in the following code. import java.io.IOException; import java.lang.ProcessHandle; import java.lang.Process; /** * @author ekiras */ public class DestroyProcess { publ...

Points to Remember This post used Java 1.9 since ProcessHandle was introduced in Java 1.9. Read More Java 9 Feature List all processes running on the OS Get the information of the current process Start a new Process and get its Process Id How to get Process Information from Process Id Destroy a running process Get the Current Process Information. In this example we will try to get information about the current process. For this we will use the m import java.io.IOException; /** * @author ekiras */ public class StartProcess { public static void main (String[] args) { try { Process process = startProcess( "tail -F /dev/null" ); printProcessInfo(process.toHandle()); } catch (IOException e) { e.printStackTrace(); } } public static void printProcessInfo (ProcessHandle processHandle) { System.out.println( "---Process Info---" ); System.out.println( " Process Id :...

Points to Remember Java 9 introduced the new Process Api in java.lang package. ProcessHandle interface can be used to perform operations with processes like start, destroy, list processes. Read More Get the information of the current process Create a new process and then terminate it Terminating the current process Destroy a process forcefully Get children of a process Get the Current Process Information. In this example we will try to get information about the current process. For this we will use the method ProcessHandle.current() method, this will return the object ProcessHandle which can be used to get the information of the process. import java.io.IOException; import java.lang.ProcessHandle; /** * @author ekiras */ public class CurrentProcess { public static void main (String[] args) throws IOException { currentProcessInfo(); } public static void currentProcessInfo () { System.out.println( "Current Process : " ); ...

Points to Remember Java 9 introduced the new Process Api in java.lang package. ProcessHandle interface can be used to perform operations with processes like start, destroy, list processes. Read More Java 9 Feature List all processes running on the OS Get the information of the current process Start a new Process and get its Process Id How to get Process Information from Process Id Destroy a running process List all Processes running on the OS. To get all the processes running on the OS you can use the static method allProcesses() of the ProcessHandle , this will return a Stream<ProcessHandle> stream of process handles which can be used to get information about each process. The below example shows how we can list all the running processes. import java.lang.ProcessHandle; import java.util.stream.Stream; /** * @author ekiras */ public class ListAllProcesses { public static void main (String[] args) { allProcesses(); } public static void allPr...

Introduction to Java 9 Process Api The New Java 9 Processes API will help provide Identifies the processess Control of Native processes Monitoring of processes List Children of processess Start a new Process Destroy a running process Access to the process input,output and error streams. On Exit Handle when a process is destroyed or completed. Testing Process API operations In this post java program we are testing the following operations List all processess running in the OS. Print the information of the current process. Create a new process and then terminate it. Do some action when the process is destroyed or completed. Try to terminate the current process. Destroy a process forcefully Get children of a process. List all Processess ProcessHandle.allProcesses() is a static method in ProcessHandle interface that returns Stream<ProcessHandle> object. We will iterate this stream to print the information of all the processess running. package com.ekiras.java9.processapi; import ...

What is a Module in Java 9 ? Java Modules are a part of Project Jigsaw . A module is a named, self-describing collection of code and data . Its code is organized as a set of packages containing types, i.e., Java classes and interfaces; its data includes resources and other kinds of static information. What are the Type of Modules in Java 9 ? There are two types of Java Modules Java Standard Modules , they start with string java. Java Non-Standard Modules , they start with string jdk. Creating a Custom Module. We can make the following types of modules Module that is independent of all other modules. Module that requires other modules as dependencies. Module that exports itself for use by other packages. Module that imports some modules and exports some packages for other modules to use. Note When we are exporting the packages in modules, only the publically expoted modules are available to use by other modules.(We will get to this later in the post.) A simple module that does not impo...

How to create a jar file. We can make a jar file with a single class using the following commands Here can be replaced by the name of the jar file you want. 1. Create a jar file with single file jar --create --file=<FileName> <file-1> 2. Create a jar file with multiple files jar --create --file=<FileName> <file-1> <file-2> 3. Create a jar file with all files in a directory jar --create --file="<FileName> -C /path/to/dir/ ." Here -C specifies the directory and . specifies that it need to include all the files in te directory. Some of the shorthands for the above commands Option Shorthand --create -c --file -f --module-path -p --verbose -v --list -t --extract -x How to extract a jar file jar -xf <FileName> How to list the contents of a jar file jar -tf <FileName>