1. What Is A Java Command Line Tool
2. Java Code

How to Run a.Jar Java File. This wikiHow teaches you how to open and run executable JAR files on a Windows or Mac computer. JAR (Java Archive) files contain data to be used with the Java program. You may need to update Java. To do so: Open the Apple menu. Click System Preferences. Jun 16, 2017  Remove the “Java” folder; Empty the Trash on the Mac as usual; Java will be removed completely this way. The Finder based approach is the easier and safer way to uninstall Java from a Mac, though Mac users can also remove Java and JRE via the command line as well. JDK (Java Development Kit), which includes JRE plus the development tools (such as compiler and debugger), is need for writing (developing) as well as running Java programs. In other words, JRE is a subset of JDK. I keep getting the message 'To use the 'java' command-line tool you need to install a JDK. Now, to the best of my knowledge, Java isn't on my MacBook Pro (from May 2015). I ported from another computer that had had Java removed although just how I no longer remember.

1. Lab1: Installing and Running Java Programs Description. This lab has two parts. First, you will step through the process of installing the software necessary to write, compile, and run Java programs.
2. So, you downloaded the Java JRE and now something needs the JDK. You obviously want the JRE for some reason so in trying to find the request for the JDK. With the JDK message prompt showing use the command I mentioned above in a terminal window.

I've installed JRE 1.8 on MacOS X 10.10 from the official Oracle site. The file I've installed was jre-8u66-macosx-x64.dmg. To my surprise, the java command says I need JDK for it to work.

Is there a way to execute a jar from the command line on Mac without JDK? If not, what options for running Java code are there (other than browser applets)?

EDIT: when invoking java -v from the command line, I get the following output:

No Java runtime present, requesting install.

and an alert window, which says:

To use the 'java' command-line tool you need to install a JDK.

One more data point: the folder /Library/Java/JavaVirtualMachines is empty. Instead, there's stuff under /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home. It even has a command-line java under /bin/. Running it with -version gives:

I wonder if I can somehow leverage that one for CLI.

Seva AlekseyevSeva Alekseyev

3 Answers

In the case a re-install does not fix the problem, you could set $JAVA_HOME to the location java is installed:

export JAVA_HOME=/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

After that, java -v should work, but you'll have to do it for every new terminal window, or add it to .bash_profile or other file depending on the shell you use.

cellocello

Yes, Full Java functionality on the command line requires the SDK.

The SDK provides a Java install that includes OS-specific libs that are not included for the applet runner.I suppose some subset of Java apps and applets might run ok from the command line, but the applet plugin provides different services.

This has annoyed me for years, since now and again I need a Java environment, but most of the time would prefer to have no trace of it on my system. Even when I do have the browser plugin installed, it's usually disabled.

TarynTaryn

When you get this message and you already have the JDK installed or no JDK installed, it is often the case that the application you are using requires a previous version of the SDK.

From this page on Java.com: Webex productivity tool for mac download.

This is most commonly because an application requires the legacy Java 6 provided by Apple. For the solution to this issue, see http://support.apple.com/kb/DL1572.

It redirects to a page on Apple's site to download and install the previous version.

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We can find mac address (physical address) of a computer using the command ‘getmac‘. This can be used to get mac address for remote computers also. Below are few examples on how to use this command. It works on XP, Vista, Windows 7, Server 2003 and Server 2008 operating systems.

Get mac addresses from CMD

Just run the command getmac to get the mac addresses. Find an example below.

This command does not show mac addresses for the network connections which are disabled. You can run ncpa.cpl and check which NICs are disabled. Further, I have received comments that this command does not help identify the mac address for a specific device. For example, if I need to get the mac address for my WiFi card, output of getmac command is not helpful. We can use ipconfig command to deal with this.

Get mac address of a remote computer

What Is A Java Command Line Tool

We can retrieve the mac addressses for a remote computer using nbtstat command.
Example:

Alternatively, We can run the below command to retrieve the mac addresses of a remote computer.

remote_computer : Full name of the remote computer or IP address
username and password are of the account on the remote computer.

Note: If the Compare Documents option is not available, the document might be protected. Tool for comparing 2 php files for mac. To unprotect a protected document, on the Tools menu, click Unprotect Document.

Example:

If you do not want to specify the password, you can skip /p parameter. You will be prompted to enter the password and the command execution will take place after that.

Errors:

Using getmac command we can retrieve the mac addresses of the machines running windows OS only. If you try this for a Linux machine you would get the error “The RPC server is unavailable.”

If you provide incorrect password, the command would fail with the error message “Logon failure: unknown user name or bad password.”

Java Code

Also Read:
Windows CMD commands reference