The Java virtual machine is responsible for memory allocation and garbage collection, along with interpretation of byte code to machine code.
The Java runtime environment (JRE) is mandatory to be installed on your computer for certain applications to work properly. The main component of JRE is the Java virtual machine (JVM), which helps run Java applications. A java file, on compilation, produces a ‘.class’ file instead of an executable file. This class file contains Java byte code, which the JVM interprets into machine-readable instructions. JVM is platform-independent, since it provides a machine interface that does not depend on the underlying operating system and hardware architecture.
There may be times that you may get error messages while launching JVM, in situations such as booting the computer, playing games like Minecraft, or opening certain Java-based applications. Here, we have compiled a few solutions that may help you fix Java virtual machine launcher errors on Windows XP, Windows 7, and Windows 8.
This error message is commonly encountered while trying to start Java-based games, such as Minecraft.
➦Open the control panel.
➦Go to system.
➦Go to advanced systems properties.
➦Click ‘environment variables’.
➦In system variables, click ‘new’.
➦Put new variable name: _JAVA_OPTIONS
➦Put new variable value: -Xmx512M
-Xmx/s is the configuration parameter that controls the amount of memory Java uses.
Xmx is the maximum heap memory size that can be allocated.
Xms is the minimum heap memory size that can be allocated.
Error Message #2: Error opening registry key.
This error may be encountered while working with Java in command prompt.
➦Go to Windows\system32 folder.
➦Delete the Java executable files, including java.exe, javaw.exe, and javaws.exe.
Error Message #3: Java Virtual Machine Launcher could not find the main class: program will now exit
➦Click ‘start’ in the main menu.
➦In the search box that appears, type ‘mrt’ and press enter. A windows utility called ‘Microsoft malicious software removal tool’ will get launched.
➦Click ‘next’ and choose ‘full scan’.
➦Reboot your computer after you’ve finished scanning.
➦Click ‘start’ and launch the system configuration utility by typing ‘msconfig’ in the search field.
➦Click the ‘startup’ tab and remove the check mark next to ‘WJView.exe’ and ‘javaw.exe’.
➦Reboot when prompted.
This error may be encountered while trying to open an application.
➦Click ‘start’ and go to ‘default programs’.
➦Select ‘Associate a file type or protocol with a program’.
➦Click on the extension (.jar) to view the program that opens it by default.
➦Click ‘change program’ and select the default program ‘JAVA virtual machine launcher’.
➦Click ‘close’ and check whether the issue is resolved.
➦If not, try uninstalling and reinstalling Java.
➦If the problem still persists, check with the technical support of the application which gives you the error.
If you are still not sure about all this, it would be advisable to hire the services of a qualified computer technician to sort out the problem.