Unable to create an instance of the Java Virtual Machine error

At times we get an error message “Unable to create an instance of the Java Virtual Machine” while opening JDeveloper.

OR

"Error occurred during initialization of VM

Could not reserve enough space for object heap"

 We can resolve this problem by increasing the virtual memory space for Jdeveloper. Follow below steps:
(This error was seen most of the times in 32 bit OS)

1. Find for file jdev.conf which is usually in the path <Jded_Root_Folder>/ jdevbinjdevbin
2. Search for a line with text “AddVMOption” and add this text “AddVMOption       -Xmx256M” below that line

After the change