About java : Insufficient-memory-to-run-Java-Runtime-environment-to-continue

I have a system with 4 GB of RAM with Windows OS. I installed VMWare to set up Ubuntu Virtual machine with 2GB RAM. In Ubuntu, I opened Eclipse and started coding and Eclipse started closing again and again and I started getting the following error:

 There is insufficient memory for the Java Runtime Environment to continue.     Native memory allocation (mmap) failed to map 28311552 bytes for     committing reserved memory.
Possible reasons:
 The system is out of physical RAM or swap space
   In 32 bit mode, the process size limit was hit
 Possible solutions:
   Reduce memory load on the system
   Increase physical memory or swap space
   Check if swap backing store is full
   Use 64 bit Java on a 64 bit OS
   Decrease Java heap size (-Xmx/-Xms)
   Decrease number of Java threads
   Decrease Java thread stack sizes (-Xss)
   Set larger code cache with -XX:ReservedCodeCacheSize=
 This output file may be truncated or incomplete.

  Out of Memory Error (os_linux.cpp:2640), pid=4608, tid=0x6dc6eb40

 JRE version: Java(TM) SE Runtime Environment (8.0_161-b12) (build 1.8.0_161-b12)
 Java VM: Java HotSpot(TM) Client VM (25.161-b12 mixed mode linux-x86 )
 Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again


---------------  T H R E A D  ---------------

Current thread (0x099ab400):  VMThread [stack: 0x6dbee000,0x6dc6f000] [id=4629]

Stack: [0x6dbee000,0x6dc6f000],  sp=0x6dc6d240,  free space=508k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x5bffaf]  VMError::report_and_die()+0x16f
V  [libjvm.so+0x20e115]  report_vm_out_of_memory(char const*, int, unsigned int, VMErrorType, char const*)+0x55
V  [libjvm.so+0x4a2686]  os::Linux::commit_memory_impl(char*, unsigned int, bool)+0xe6
V  [libjvm.so+0x4a2afd]  os::pd_commit_memory_or_exit(char*, unsigned int, unsigned int, bool, char const*)+0x2d
V  [libjvm.so+0x49c660]  os::commit_memory_or_exit(char*, unsigned int, unsigned int, bool, char const*)+0x30
V  [libjvm.so+0x2741ad]  G1PageBasedVirtualSpace::commit_internal(unsigned int, unsigned int)+0x9d
V  [libjvm.so+0x27440c]  G1PageBasedVirtualSpace::commit(unsigned int, unsigned int)+0xfc
V  [libjvm.so+0x276a68]  G1RegionsLargerThanCommitSizeMapper::commit_regions(unsigned int, unsigned int)+0x28
V  [libjvm.so+0x2bc2ba]  HeapRegionManager::commit_regions(unsigned int, unsigned int)+0x5a
V  [libjvm.so+0x2bd343]  HeapRegionManager::make_regions_available(unsigned int, unsigned int)+0x23
V  [libjvm.so+0x2bd851]  HeapRegionManager::expand_by(unsigned int)+0xa1
V  [libjvm.so+0x250a7c]  G1CollectedHeap::expand(unsigned int)+0x11c
V  [libjvm.so+0x25b3fa]  G1CollectedHeap::do_collection_pause_at_safepoint(double)+0xd5a
V  [libjvm.so+0x5cbafe]  VM_G1IncCollectionPause::doit()+0x6e
V  [libjvm.so+0x5caad7]  VM_Operation::evaluate()+0x47
V  [libjvm.so+0x5c8ba3]  VMThread::evaluate_operation(VM_Operation*)+0xb3
V  [libjvm.so+0x5c8f40]  VMThread::loop()+0x1b0
V  [libjvm.so+0x5c93a5]  VMThread::run()+0x85
V  [libjvm.so+0x4a5219]  java_start(Thread*)+0x119
C  [libpthread.so.0+0x6295]  start_thread+0xe5

VM_Operation (0xbfbfede0): G1IncCollectionPause, mode: safepoint, requested by thread 0x0988f800

--------------  P R O C E S S  ---------------

The Java virtual machine process runs out of memory.

There are several possibilities what you could do. In my view, the following possibilities are the most promising if you want to keep the current restrictions for the process:

• Decrease Java heap size (-Xmx/-Xms):
  In eclipse.ini there is probably a line like -Xmx1024m that you could replace with for example -Xmx640m. Try out which maximum heap space is still sufficient for your needs. Make sure -Xms is not greater than -Xmx.
• If and only if you have a 64-bit system, you can use Eclipse 64-bit and Eclipse OpenJ9 instead of Eclipse 32-bit and the Java HotSpot 32-bit VM you are currently using. By default, OpenJ9 is more efficient in terms of memory consumption and can also be further tuned in this respect.

The possibility Use 64 bit Java on a 64 bit OS seems to be given improperly here, because a 64-bit Java VM can address more memory, but is less memory efficient than the equivalent 32-bit VM.

You have too little memory available to eclipse. Best is to upgrade your system with more ram.

Unless you have good reason not to then use eclipse directly under windows without using virtual box. If you must use Ubuntu consider using a 32-bit version of Ubuntu and Java and eclipse, or install Ubuntu next to windows so you can boot into it and have all your memory.