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Fri, Aug 05, 2022 5:01 pm

Running java from an Eclipse installation from the command line

For an introductory Java class I am taking, I installed the Eclipse integrated development environment (IDE) on a Microsoft Windows 10 system. In addition to compiling and running Java programs through the IDE, though, I wanted to compile Java programs using the Java compiler, javac.exe, and run them using java.exe from Windows' command-line interface (CLI). The installation process for Eclipse installed the javac.exe and java.exe executables in a user directory with a long directory path to those executables. Note: you should install the Eclipse IDE from the account which you wish to use to compile and run java programs. The location wasn't added to the path environment variable, so if you try to run the programs from a command prompt, you will see the following, unless you specify the full path name where the executable files are located.

'java' is not recognized as an internal or external command,
operable program or batch file.

'javac' is not recognized as an internal or external command,
operable program or batch file.


I didn't want to have to copy and paste the full path on the command line or type it in every time I wanted to use the two executables from the command line. To avoid that problem you can add the directory path to the path environment variable through a set path= command or create another environment variable, e.g., JAVA_HOME that points to the directory where the two files are located, though both methods apply only to a particular command line instance. I.e., if you close a command prompt window where you've set one of the variables to include the location where Eclipse installed java.exe and javac.exe then open another command prompt window, you will have to set the environment variable again in the new instance. An alternative way to make a permanent path change from a command prompt interface is to use the Windows setx command, though I would not recommend it, since if your path variable already has a path that is more than 1,024 characters long, setx can truncate the path to 1,024 characters, so that you not only don't get the additional directory added to the path, but you may lose some of the path setting you had prior to issuing the command. If you want to make a permanent change, see responses to the "Overcoming the 1024 character limit with setx" posting at the site.

[More Info ]

[/languages/java/eclipse] permanent link

Mon, Jul 11, 2022 9:08 pm

Enabling Wake on LAN (WoL) on a Dell PC with a Realtek PCIe GBE NIC

Computers that support the Wake-on-LAN (WoL or WOL) standard can be awoken from a sleep state by sending a "magic packet" to their network card from another system. For an Ethernet card, the packet is an Ethernet frame that is sent to all systems on the local area network (LAN). The packet contains 6 bytes of the hexadecimal value FF followed by 16 repetitions of the 48-bit media access control (MAC) address of the system to be awakened from a sleep state. I tried unsuccessfully on Friday to remotely "wake" a Dell PC from another PC by connecting to the other PC on the same LAN and then sending a magic packet to the sleeping computer using the Wake-on-LAN program from—I no longer see a download link for the free software for Windows systems on the developer's website, but you can download it from a snapshot of the site taken by the Wayback Machine on December 19, 2007 at Wake-on-LAN where you can also find the utility MCGETMAC.EXE that will allow you to obtain the MAC address for a network interface card (NIC) on another computer, or you can download WakeMeOnLan, another free program for Windows systems created by Nir Sofer. After the user powered on her Dell computer this morning and left the office, I connected to her system remotely to verify that the system is configured to respond to a magic packet to wake it when it is sleeping.

[ More Info ]

[/network/wol] permanent link

Fri, Jun 24, 2022 10:22 pm

Raising a number to a power in Microsoft Excel

There are two ways to use exponentiation, i.e., to raise a number to a power in the Microsoft Excel spreadsheet program. You can use the POWER(number, exponent) function, e.g., to raise 2 to the power 3, you could put =POWER(2,3) in a cell which would yield the value 8. Or you can use the exponent operator, the caret character, i.e., ^ (shift-6 on a Windows keyboard). E.g., to calculate 2 raised to the power 3 you could put =2^3 in a cell which produces the value 8.

[/software/office/excel] permanent link

Thu, Jun 23, 2022 9:46 pm

Maximum memory for an HP 3047h Motherboard

A family member said a Windows 10 system she is using for gaming is running slowly and inquired about adding additional memory to the system. I didn't know the model of the motherboard in the system nor the maximum amount of memory it could accomodate. Rather than opening up the desktop system, I checked on the manufacturer and model of the motherboard from a command-line interface (CLI) with a Windows Management Instrumentation Command-line (WMIC) command and found it was a Hewlett-Packard (HP) 3047h motherboard.

Microsoft Windows [Version 10.0.19043.1766]
(c) Microsoft Corporation. All rights reserved.

C:\Users\Colleen>wmic baseboard get product,manufacturer,model,serialnumber,version
Manufacturer     Model  Product  SerialNumber  Version
Hewlett-Packard         3047h    MXL11925F3


I also saw 3047h listed as the "baseboard product" ("baseboard" is another name used for "motherboard") when I typed System Information in the Windows "Type here to search" field and selcted that application.

[ More Info ]

[/pc/hardware/motherboard/3047h] permanent link

Wed, Jun 22, 2022 9:49 pm

Excluding a file or directory from monitoring and scanning by Acronis Cyber Protect Home

Because Acronis® Cyber Protect Home Office, which is backup, cloning, and antivirus software for Windows and macOS systems, was prompting a user as to whether Java should be allowed to run on a Microsoft Windows system on which it was needed, I wanted to exclude the Java.exe program from monitoring. The process to exclude a program from monitoring and scanning by that application is as follows:
  1. Start Acronis Cyber Protect Home Office. When prompted "Do you want to allow this app to make changes to your device?" to allow CyberProtectHomeOfficeLauncher.exe by the verified publisher Acronis International GmbH to run, choose "Yes."
  2. Select Protection, if it is not already displayed.

    Acronis Cyber Protect - Protection

  3. Click on Protection Exclusions then click on Add exclusion and choose either Add file or Add folder depending on whether you wish to exclude either an individual file or an entire directory from being scanned and possibly flagged.

    Acronis Cyber Protect - Protection Exclusions

  4. When you select an option, e.g., Add file, you can browse to the relevant locaton and select what you wish to exclude from monitoring and scanning activities.

    Acronis Cyber 
Protect - Java Excluded

  5. Click on Save to have the application keep the changes you've made.

[/software/backup/acronis] permanent link

Tue, Apr 05, 2022 6:05 pm

Let's Encrypt Problem binding to port 80: Could not bind to IPv4 or IPv6

A couple of users notified me that they were receiving warning messages regarding the security certificate on their email server when they were checking email with Microsoft Outlook. I checked the expiration date on the security certificate for the email server with the OpenSSL command openssl s_client -connect (the system is using Dovecot, which is an open-source IMAP/POP3 software program providing users with the ability to download their email). Dovecot listens on TCP port 995 for POP3S secure email connections for downloading email. I could see the certificae was expired and I issued the quit command when I saw the "OK Dovecot ready" prompt. The email security certificate on the system is provided by Let's Encrypt, so I then tried renewing the certificate from the root account with the letsencrypt renew command, but was unsuccessful. I found the solution was to stop the Apache web server software running on the system, thanks to a post by JuergenAuer at Renewing certificate getting error: Problem binding to port 80: Could not bind to IPv4 or IPv6. After I stopped the web server software, I was able to reissue the letsencrypt command to renew the certificate without the "Problem binding to port 80" error message. I then restarted the Apache web server software and Dovecot.

[ More Info ]

[/security/encryption/openssl] permanent link

Tue, Mar 29, 2022 9:42 pm

Close Microsoft News and Interests Popup

On a Microsoft Windows 10 system, unless the News and Interests feature has been disabled, you will see an area at the bottom right of the screen in the notifications area, aka status area, of the taskbar displaying information about the weather, such as the local temperature where you live.

You can click on that area to view the titles of news articles deemed of interest to you. When you click on it, you will see something similar to what is displayed in the image below.

Popup - News and Interests

If you click outside of the area, the area that pops up with the news articles will normally go away, but sometimes it will remain and won't go away if you click elswhere, hit Escape, click on the refresh icon in the area, etc. There is an option to disable the News and Interests display, which you can get to by right-clicking on the area where the temperature is displayed. But if you do that when the popup display for News and Interests is stuck on the screen then you can't see the options area to disable it because it is behind the area where the News and Interests appear and is thus inaccessible. In such cases, I've found that changing the display settings and then reverting the settings to what they were resolves the problem. You can get rid of the News and Windows popup display by the following steps:

  1. You can hit the Windows key (the one with the Windows symbol on it, which may be on the left side of your keyboard between the Ctrl and Alt keys, to display the desktop. Or, alternatively, you could manually minimize all open windows.
  2. Right-click on an open area somewhere on the desktop and select Display Settings. If the Display Settings window isn't fully visible when you do so, drag that window into a position where you can see the settings.
  3. Change the display resolution.
  4. When asked whether you wish to keep the new resolution or revert to the prior resolution, choose Revert.

The News and Interests display should then disappear. You should be able to click on it again, though, if you want to see the latest news headlines, but have it go away when you click elsewhere.

[ More Info ]

[/os/windows/win10] permanent link

Fri, Feb 04, 2022 3:27 pm

Evernote - Clipper has encountered an error

Recently, when I've tried to save a webpage to Evernote in the Brave web browser, I frequently see the message "Clipper has encountered an error" with "Unknown error occurred. UNK."

Clipper unknown error

I have been able to save the page by disabling and then re-enabling the Evernote extension in the browser. In the Brave Browser, you can do so by closing the error message window, then clicking on the icon of 3 short horizontal bars at the upper, left-hand side of the Brave window which will display a menu of options. Select "extensions" and then click on the red slider button at the bottom, right-hand side of the Evernote Web Clipper extension to turn it off (it will go from red to gray).

Evernote Web Clipper

Then click on it again to re-enable the extension. You can then close the Brave extensions tab (brave://extensions). You will then need to refresh the page. After I've disabled and re-enabled the extension when I've seen the error message, I've then been able to click on the icon for Evernote near the browser's address bar and save webpages to Evernote.

[/network/web/browser/brave/evernote] permanent link

Sat, Jan 22, 2022 10:37 pm

AMD FX-6350 Six-Core Processor and Windows 11

When I went to Settings then Update & Security on a computer running Microsoft Windows 10 to update it to Windows 11, I saw the message "This PC doesn't currently meet the minimum system requirements to run Windows 11" and "Get the details and see if there are things you can do in the PC Health Check app." So I clicked on the " Get PC Health Check" link and downloaded and installed the application. When I ran the program, it reported "This PC doesn't currently meet Windows 11 system requirements" and provided details as to why that assessment was made. The system has adequate memory, disk space, and a 3.9 GHz processor (the minimum processor speed required is 1 GHz) with 3 cores (2 or more are required), but there was a warning that "This PC must support Secure Boot" and "TPM 2.0 must be supported and enabled on this PC." Secure Boot is a Unified Extensible Firmware Interface (UEFI)" specification. The system is configured for UEFI booting but, even if it wasn't, the October 11, 2021 article How to Install Windows 11 on Legacy BIOS without Secure Boot or TPM 2.0 by Parth Sawhney provides a workaround for systems booting from Basic Input/Output System (BIOS), which UEFI replaced.

PC Health Check - Requirements not met

But the indication that the AMD FX™-6350 Six-Core Processor was not supported seemed a showstopper. I also checked the June 29, 2021 List of Intel and AMD Processors NOT Supported by Windows 11 by Shivam Malani and found the FX-6350 processor is also listed there. The author of that article notes “there’s an endless list of processors that Windows 11 doesn’t support. Even systems capable of flawlessly running high-end games aren’t eligible for Windows 11 due to the limited hardware support” and states that if a system is more than four years old that it is very less likely to be among systems that can be upgraded to Windows 11. A list of Advanced Micro Devices (AMD) processors supported in Windows 11 can be found in the December 2, 2021 article Windows 11 supported AMD processors on the Microsoft Docs website.

You can obtain brief details on a system's processor through Windows Management Instrumentation Command-line (WMIC) at a command prompt inteface.

C:\>wmic cpu list brief /format:list

Caption=AMD64 Family 21 Model 2 Stepping 0
Name=AMD FX(tm)-6350 Six-Core Processor
SocketDesignation=CPU 1


You can check the full details on a processor from a command-line interface (CLI) with wmic cpu list /format:list.

[/os/windows/win11] permanent link

Mon, Jan 17, 2022 10:09 pm

Western Digital My Book disk drive P/N WDBBGB0080HBK-NA Adapter

I found a Western Digital 8 TB My Book external USB disk drive with part number WDBBGB0080HBK-NA in a box with a number of other disk drives, but the box did not contain the power adapter for that drive. The back of the drive has "12V" next to the place where the power adapter connects to the drive but no indication of the amps needed. You can find a listing of the specs for power adapters needed for various disk drives at Western Digital's Power Adapters for WD Products webpage. That page shows that the My Book drives with the following part numbers use AC adapters that are 12 volts, 1.5 amps, and 18 watts.


Note: you can find an explanation of the format Western Digital uses for their model numbers in the PDF file downloadable from Western Digital at Model Numbers - Branded Products or here. For older drives, Western Digital also provides a Retired Model and Order Number Formats for WD Products document that is also available here.

In this case, the "0080H" indicates the drive is a 3.5" drive with a capacity of 8TB.

I didn't have a power adapter from another Western Digital drive handy that met the required specifications for volts, amps, and watts. I could order a needed adapter online—the WD 18-watt power adapter is model number WDPS037RNN while the 36-watt version is model WDPS039RNN—from Amazon and receive the adapter in just a few days, but I needed to check on whether that particular drive held a needed backup immediately. I had a Seagate Backup Plus 5 TB USB 3.0 Desktop Drive available with an ADS-18E-12N power adapter which lists an output of 12V and 1.5A on the adapter, so I figured I could use that drive, since though that adapter doesn't list the wattage, the formula to calculate watts if the amperage and voltage are known is amps x volts = watts and 12 x 1.5 = 18 (Obtain Watts from Amps and Volts provides an online converter). So I was able to use the Shenzhen Honor Electronic Co. ADS-18E-12N adapter from the Seagate drive on the Western Digital drive. Unfortunately, though it held a backup for the system for which I needed to recover files, that backup did not contain the needed files.


  1. Specs of the WD Essential Power Adapter
    By Dan Ketchum

[/hardware/power/adapters/wdc] permanent link

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