How to increase java virtual machine.. i am using Ocj4 server

How to increase memory size java virtual machine.. i am using Ocj4 server
Edited by: java_net on Aug 29, 2008 4:09 PM

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How does JVM (Java Virtual Machine) relate to XI?

Can somebody describe to me exactly what JVM (Java Virtual Machine) is and how it is related/associated to XI? Responses are appreciated, thanks in advance!

HI,
A Java Virtual Machine (JVM), is a virtual machine that interprets and executes Java bytecode. This code is most often generated by Java language compilers, although the JVM can also be targeted by compilers of other languages. JVMs may be developed by other companies as long as they adhere to the JVM standard published by Sun.
The JVM is a crucial component of the Java Platform. Because JVMs are available for many hardware and software platforms, Java can be both middleware and a platform in its own right - hence the expression "Write once, run anywhere." The use of the same bytecode for all platforms allows Java to be described as "Compile once, run anywhere", as opposed to "Write once, compile anywhere", which describes cross-platform compiled languages.
Starting with J2SE 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924[1]. As of 2006, changes to specification to support changes proposed to the class file format (JSR 202[2]) are being done as a maintenance release of JSR 924. The specification for the JVM is published in book form[3], known as "blue book". The preface states:
We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Sun provides tests which verify the proper operation of implementations of the Java Virtual Machine.
Sun's JVM is called HotSpot. Clean-room Java implementations include Kaffe and IBM's. Sun retains control over the Java trademark, which it uses to certify implementation suites as fully compatible with Sun's specification
we have two caches JAVA,ABAP.
i mean all objects which will execute in JAVA Cache those need the JVM.
Regards
Chilla

Could Not Create Java Virtual Machine when lauching PS3 Meadis server

I suddenly get the following error message when trying to launch the PS3 Media Server, " COULD NOT CREATE JAVA VIRTUAL MACHINE". I have tried uninstalling and installing both Java and the PS3 Media Server. Nothing seems to work. Any ideas or advice?

You changed something on your machine. Might help to remember what.
But to start with you first figure out if java itself is working. If it is then it is problem with the application and not java.

How to import a virtual machine to a Hyper-V server by programme on Windows server 2012 ?

Hi
As we know, Hyper-V of Windows server 2012 can support importing a VM without exporting it first manually now.
So I try to code a programme to do it.
I use the method "ExportVirtualSystemEx" of "Msvm_VirtualSystemManagementService". referenced by
http://msdn.microsoft.com/en-us/library/dd379583(v=vs.85).aspx
But the error said that "You can import a virtual machine only if you used Hyper-V to create and export it."
Since we can import an unexported virtual machine in Hyper-V of windows server 2012 manually, so is there any API to support to do it by programme ?

Hi vincent
Thanks for your infomation. It is really useful for us.
I 'd like to know How to adjust path ?
When I use command 'import-vm' to import VM, I got the error "import-vm : Unable to import virtual machine due to configuration errors. Please use Compare-VM to repair the virtual machine."
I try to fix this error referenced by
http://technet.microsoft.com/en-us/library/hh848612.aspx
I ran the commands as bellow :
$report = compare-vm -path 'J:\HyperV\VM2008R2_1\Virtual Machines\6D2B5BF6-0BC0-4B1C-86BA-5A28DAB3DFCF.xml'
$report.Incompatibilities | fl
and got the information:
Message : Virtual Hard Disk file not found.
MessageId : 40010
Source : Microsoft.HyperV.PowerShell.HardDiskDrive
Message : Could not find Ethernet switch 'Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #54 - Virtual
Switch'.
MessageId : 33012
Source : Microsoft.HyperV.PowerShell.VMNetworkAdapter
Message : Virtual Hard Disk file not found.
MessageId : 40010
Source : Microsoft.HyperV.PowerShell.HardDiskDrive
Message : Virtual Hard Disk file not found.
MessageId : 40010
Source : Microsoft.HyperV.PowerShell.HardDiskDrive
Message : Could not find Ethernet switch 'Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #54 - Virtual
Switch'.
MessageId : 33012
Source : Microsoft.HyperV.PowerShell.VMNetworkAdapter
Message : Virtual Hard Disk file not found.
MessageId : 40010
Source : Microsoft.HyperV.PowerShell.HardDiskDrive
Message : Virtual Hard Disk file not found.
MessageId : 40010
Source : Microsoft.HyperV.PowerShell.HardDiskDrive
Message : Could not find Ethernet switch 'Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #54 - Virtual
Switch'.
MessageId : 33012
Source : Microsoft.HyperV.PowerShell.VMNetworkAdapter
Message : Could not find Ethernet switch 'Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #54 - Virtual
Switch'.
MessageId : 33012
Source : Microsoft.HyperV.PowerShell.VMNetworkAdapter
But this web page don't mentioned how to fix the "Virtual Hard Disk file not found" error.
and I don't want to fix the VMNetworkAdapter issue by disconnect it.
So could you told me how to modify the virtual hard disk file path and VMNetworkAdapter to make sure that I can import the virtual machine successfully?

Virtual Machine( VM WARE) using Windows Server 2008 R2- how to install a software from host to guest.

Dear All,
Can you Please tell how to install a software SQL Server 2012 from the Host to my Guest OS Windows Server 2008R2 in my Virtual Machine? I am using VMPlayer and have already created a VM using the Windows Server 2008R2.
I just need help in installing another software (SQLServer2012) from my laptop(guest computer) to my host VM. I also have the files downloaded into my C drive of my laptop(hostcomputer) for the SQL Server 2012. But I am lost as to where to click to install
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I know I put into Windows Server 2012 forum but I thin the procedure should be similar.
Thank-you

there are few options,
you can copy the files from your host to virtual machine
you can create a iso file and mount it to vm
you can share the source files and access as a share
Darshana Jayathilake

Unrecognized option: -server Could not create the Java virtual machine.

Hi
I'm running JBoss 4.0 with JDK 1.5.0_12 (or could use 1.2.1 or 1.4.2) but when I try run.bat I get the following error
Unrecognized option: -server Could not create the Java virtual machine.
IfI try removing -server I get a different message
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/jboss/Main (Unsupported major.minor version 48.0)
Hope you can help. Really need to get this going ASAP
Thanks
Geri

Hi all,
Thanks for responding.
This is what I get when I did the following:
$java -version
java version "1.2.2"
Solaris VM (build Solaris_JDK_1.2.2_06, native threads, sunwjit)
$which java
/usr/bin/java
The java version was definitely not what I expected as I had installed the Java(TM) 2 Runtime Environment 1.3.1 and no Java hotspot was found even though I had already installed it. Maybe it because I did not install them correctly.
How do I get rid of the older version and replace it with a newer one?
I noticed that in later versions of J2SE, Hotspot VM was said to have been incorporated in it. But there are no guides on how to get Hotspot up and running, it will be great if anyone of you can guide me on this or point me to a site that can help me.
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Unrecognized option -a could not create Java Virtual Machine..?

while using "java -classpath <axis jar files> -a <mywsdlfile>
i got the error message as 'Unrecognized option -a could not create Java Virtual Machine"
plz help me how to get rid of this?? i've successfully installed axis1.4 & tomcat6.

Sorry, I thought that you meant to pass "-a" to the java tool and not the WSDL2JAVA tool. "-a" is definitely a valid option for WSDL2Java.
But your error indicates that it is indeed trying to pass "-a" as an option to java, which is why the error is "unable to create Java Virtual Machine".
Try using the long format for the "-a" option which is "--async". (http://ws.apache.org/axis2/tools/1_0/CodegenToolReference.html).
"java classpath pathToJAR/Filename org.apache.axis.wsdl.WSDL2Java --async pathToWsdl/WsdlFilename"
Edited by: javaguy on Sep 2, 2009 11:46 PM

How can I know the version of Application Server Java Virtual Machine

How can I know the version of Application Server Java Virtual Machine?
Thanks a lot.

Thats easy. Your jdk/jre are located in the App Server home directory. Just run the java command under the jdk directory with the "-version" switch and it will provide you with detailed information about your VM.
For example if you're doing it at command prompt it will be something like
java -versionI hope this will be useful to you.
Regards,
Wasif

How do I enable Java Virtual Machine (JVM)? I upgraded yesterday and somehow it became disabled.

I upgraded to newest version yesterday and when I went to a government site today, it tells me I have no access until I enable Java Virtual Machine (JVM). How do I do this??? (I did access this site by using Internet Explorer - but I much prefer Firefox)

If you updated from a Firefox version prior to Firefox 3.6, the version of Java that you have installed is not being recognized. Firefox 3.6 and later requires Java 1.6.0.10 or higher; you have Java 1.6.0.05
'''''Other Issues''''': ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~
'''Update Java''': your ver. 1.6.0.~~red:05~~; current ver. 1.6.0.20 (important security update 04-15-2010)
(~~red:Firefox 3.6 and above requires Java 1.6.0.10 or higher~~; see: http://support.mozilla.com/en-US/kb/Java-related+issues#Java_does_not_work_in_Firefox_3_6 )
''(Windows users: Do the manual update; very easy.)''
~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/
See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]'''
Do the update with Firefox closed.
'''NOTE:''' Java version 1.6.0.21 has been released. It is mainly an update for developers of Java applications and most users do not need to be concerned about downloading version 1.6.0.21. '''''At this time''''', the update option in existing installations of Java 1.6.0.20 are not updating to version 1.6.0.21; '''''at this time''''', it must be manually downloaded and installed. According to the Java release notes:
''"'''Bug Fixes'''''
''Java SE 6 Update 21 does not contain any additional fixes for security vulnerabilities to its previous release, Java SE 6 Update 20. Users who have Java SE 6 Update 20 have the latest security fixes and do not need to upgrade to this release to be current on security fixes."'' Source: http://java.sun.com/javase/6/webnotes/6u21.html

Could not find a valid Java virtual machine to load

On a fresh copy of CFMX8, when I run updater 7, it responds
'Could not find a valid Java virtual machine to load'.
This is being installed on a Win2K3 server and this is on a
'freshly minted' POC box solely for the purpose of
installing/testing CFMX8 to determine how it compares to our
CFMX6.1 environment.
You will notice that it is NOT being installed in the default
directory:
JRun Version Information
Vendor Macromedia
Product Name JRun 4.0
Build Number 108487
Version Full Version
License Type Trial License
Serial Number JRD400-69341-58259-30688
JRun 3.x Serial Number
Restricted to Single IP No
Installation Root D:\ISG\software\jrun4
Expiration Date Mar 29, 2008
Evaluation Days Remaining 29
JDK path (JAVA_HOME): D:/ISG/software/jrun4/jre
I do find it curious that I can run the Updater 6, and it
seems to behave properly (it finds the VM). I ran it just as a
test, then wiped everything to start over from scratch. For some
reason do I need to direct Updater 7 to the installation that I did
not have to do in Updater 6?
Thank you in advance for your assistance - Jacques

tried executing the following cmd, below is the following error:
<<command i executed>>
C:\Program Files\Java\jre1.5.0_09\bin>java -classpath "C:\Program Files\Java\jre1.5.0_09\lib\javaws.jar" com.sun.javaws.Main https://<IPddr>:8443/sample.jnlp
Can you pls let me know how it can be resolved?Umm.. I am not sure, but I will start with
a question. Why not do it this way?C:\Program Files\Java\jre1.5.0_09\bin>javaws https://<IPddr>:8443/sample.jnlp

The crash happened outside the java virtual machine in native code

Hi,
I have a biometric device with which I am given some C++ dlls. I am trying to call methods inside these using java (jna). I am loading the dll "zkemsdk.dll+" as follows:
zkemkeeper INSTANCE1 = (zkemkeeper)Native.loadLibrary("zkemsdk", zkemkeeper.class);//zkemsdk is the dll, I am loading the dll here.
Then, I am calling the function:
zkemkeeper.INSTANCE1.Z_Connect_NETEX("ip address",4370);//Z_Connect_NETEX is a function inside zkemsdk.dll
This returns me true or false based on whether am connected to the biometric device or not.Thus I am able to invoke this method without issues. But for other methods inside the dll, run time exception is thrown in console:
Can someone help me resolve this issue. ??? Following is the content of the log file generated.
# A fatal error has been detected by the Java Runtime Environment:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0351fe3b, pid=1664, tid=3832
# JRE version: 6.0_20-b02
# Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode, sharing windows-x86 )
# Problematic frame:
# C [zkemsdk.dll+0xfe3b]
# If you would like to submit a bug report, please visit:
# http://www.java.net/external?url=http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
--------------- T H R E A D ---------------
Current thread (0x003a9000): JavaThread "main" [_thread_in_native, id=3832, stack(0x008c0000,0x00910000)]
siginfo: ExceptionCode=0xc0000005, reading address 0x00000106
Registers:
EAX=0x0090f7c4, EBX=0x00000001, ECX=0x00000000, EDX=0x00000001
ESP=0x0090f7b4, EBP=0x0090f848, ESI=0x00000096, EDI=0x003a9000
EIP=0x0351fe3b, EFLAGS=0x00010216
Top of Stack: (sp=0x0090f7b4)
0x0090f7b4: 00000000 0090f930 000003fc 00000103
0x0090f7c4: 0090f800 6d9532d0 373e92a0 00912ec5
0x0090f7d4: 00000401 0090f7d8 369860d1 0090f800
0x0090f7e4: 37390050 00000000 37390f90 00000000
0x0090f7f4: 0090f800 0090f930 003a9000 0090f830
0x0090f804: 10008fd8 0090f840 0090f930 00000008
0x0090f814: 0090f88c 0090fa28 0090f8f4 0090f848
0x0090f824: eb53f637 0351ffdc 00000096 00000003
Instructions: (pc=0x0351fe3b)
0x0351fe2b: 0f 53 50 8d 44 24 18 50 e8 58 7c 00 00 83 c4 0c
0x0351fe3b: 8b 4e 70 51 8b 0e 83 c3 04 53 6a 64 8d 54 24 18
Stack: [0x008c0000,0x00910000], sp=0x0090f7b4, free space=13d0090f2e8k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [zkemsdk.dll+0xfe3b]
C [jna5972695927945545932.tmp+0x9182]
C [jna5972695927945545932.tmp+0x2161]
C [jna5972695927945545932.tmp+0x2849]
j com.sun.jna.Function.invokeInt(I[Ljava/lang/Object;)I+0
j com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;+90
j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+194
j com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+344
j $Proxy0.Z_Beep(J)Z+19
j com.rfarrays.bhabs.fingerPrint.main([Ljava/lang/String;)V+84
v ~StubRoutines::call_stub
V [jvm.dll+0xf049c]
V [jvm.dll+0x17fcf1]
V [jvm.dll+0xf051d]
V [jvm.dll+0xf9bc5]
V [jvm.dll+0x10181d]
C [javaw.exe+0x2155]
C [javaw.exe+0x8614]
C [kernel32.dll+0xb729]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j com.sun.jna.Function.invokeInt(I[Ljava/lang/Object;)I+0
j com.sun.jna.Function.invoke([Ljava/lang/Object;Ljava/lang/Class;)Ljava/lang/Object;+90
j com.sun.jna.Function.invoke(Ljava/lang/Class;[Ljava/lang/Object;Ljava/util/Map;)Ljava/lang/Object;+194
j com.sun.jna.Library$Handler.invoke(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Object;+344
j $Proxy0.Z_Beep(J)Z+19
j com.rfarrays.bhabs.fingerPrint.main([Ljava/lang/String;)V+84
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x02b10c00 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=1976, stack(0x02dc0000,0x02e10000)]
0x02b0a400 JavaThread "CompilerThread0" daemon [_thread_blocked, id=1280, stack(0x02d70000,0x02dc0000)]
0x02b08c00 JavaThread "Attach Listener" daemon [_thread_blocked, id=1984, stack(0x02d20000,0x02d70000)]
0x02b07800 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2160, stack(0x02cd0000,0x02d20000)]
0x02b02400 JavaThread "Finalizer" daemon [_thread_blocked, id=2052, stack(0x02c80000,0x02cd0000)]
0x02afd800 JavaThread "Reference Handler" daemon [_thread_blocked, id=752, stack(0x02c30000,0x02c80000)]
=>0x003a9000 JavaThread "main" [_thread_in_native, id=3832, stack(0x008c0000,0x00910000)]
Other Threads:
0x02afc400 VMThread [stack: 0x02be0000,0x02c30000] [id=1504]
0x02b1b800 WatcherThread [stack: 0x02e10000,0x02e60000] [id=1980]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 4928K, used 2455K [0x22970000, 0x22ec0000, 0x27ec0000)
eden space 4416K, 55% used [0x22970000, 0x22bd5db0, 0x22dc0000)
from space 512K, 0% used [0x22dc0000, 0x22dc0000, 0x22e40000)
to space 512K, 0% used [0x22e40000, 0x22e40000, 0x22ec0000)
tenured generation total 10944K, used 0K [0x27ec0000, 0x28970000, 0x32970000)
the space 10944K, 0% used [0x27ec0000, 0x27ec0000, 0x27ec0200, 0x28970000)
compacting perm gen total 12288K, used 343K [0x32970000, 0x33570000, 0x36970000)
the space 12288K, 2% used [0x32970000, 0x329c5f20, 0x329c6000, 0x33570000)
ro space 10240K, 51% used [0x36970000, 0x36e9ae00, 0x36e9ae00, 0x37370000)
rw space 12288K, 54% used [0x37370000, 0x37a072d8, 0x37a07400, 0x37f70000)
Dynamic libraries:
0x00400000 - 0x00424000 C:\Program Files\Java\jre6\bin\javaw.exe
0x7c900000 - 0x7c9b2000 C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c8f6000 C:\WINDOWS\system32\kernel32.dll
0x77dd0000 - 0x77e6b000 C:\WINDOWS\system32\ADVAPI32.dll
0x77e70000 - 0x77f03000 C:\WINDOWS\system32\RPCRT4.dll
0x77fe0000 - 0x77ff1000 C:\WINDOWS\system32\Secur32.dll
0x7e410000 - 0x7e4a1000 C:\WINDOWS\system32\USER32.dll
0x77f10000 - 0x77f59000 C:\WINDOWS\system32\GDI32.dll
0x76390000 - 0x763ad000 C:\WINDOWS\system32\IMM32.DLL
0x7c340000 - 0x7c396000 C:\Program Files\Java\jre6\bin\msvcr71.dll
0x6d800000 - 0x6da97000 C:\Program Files\Java\jre6\bin\client\jvm.dll
0x76b40000 - 0x76b6d000 C:\WINDOWS\system32\WINMM.dll
0x6d7b0000 - 0x6d7bc000 C:\Program Files\Java\jre6\bin\verify.dll
0x6d330000 - 0x6d34f000 C:\Program Files\Java\jre6\bin\java.dll
0x6d290000 - 0x6d298000 C:\Program Files\Java\jre6\bin\hpi.dll
0x76bf0000 - 0x76bfb000 C:\WINDOWS\system32\PSAPI.DLL
0x6d7f0000 - 0x6d7ff000 C:\Program Files\Java\jre6\bin\zip.dll
0x68000000 - 0x68036000 C:\WINDOWS\system32\rsaenh.dll
0x77c10000 - 0x77c68000 C:\WINDOWS\system32\msvcrt.dll
0x769c0000 - 0x76a74000 C:\WINDOWS\system32\USERENV.dll
0x5b860000 - 0x5b8b5000 C:\WINDOWS\system32\netapi32.dll
0x6d610000 - 0x6d623000 C:\Program Files\Java\jre6\bin\net.dll
0x71ab0000 - 0x71ac7000 C:\WINDOWS\system32\WS2_32.dll
0x71aa0000 - 0x71aa8000 C:\WINDOWS\system32\WS2HELP.dll
0x71a50000 - 0x71a8f000 C:\WINDOWS\System32\mswsock.dll
0x76f20000 - 0x76f47000 C:\WINDOWS\system32\DNSAPI.dll
0x76d60000 - 0x76d79000 C:\WINDOWS\system32\iphlpapi.dll
0x76fb0000 - 0x76fb8000 C:\WINDOWS\System32\winrnr.dll
0x76f60000 - 0x76f8c000 C:\WINDOWS\system32\WLDAP32.dll
0x76fc0000 - 0x76fc6000 C:\WINDOWS\system32\rasadhlp.dll
0x10000000 - 0x10052000 C:\Documents and Settings\bkonwar\Local Settings\Temp\jna5972695927945545932.tmp
0x03510000 - 0x03546000 C:\WINDOWS\system32\zkemsdk.dll
0x03560000 - 0x03574000 C:\WINDOWS\system32\commpro.dll
0x662b0000 - 0x66308000 C:\WINDOWS\system32\hnetcfg.dll
0x71a90000 - 0x71a98000 C:\WINDOWS\System32\wshtcpip.dll
VM Arguments:
jvm_args: -Dfile.encoding=Cp1252
java_command: com.xyz.bhabs.fingerPrint
Launcher Type: SUN_STANDARD
Environment Variables:
PATH=C:/Program Files/Java/jre6/bin/client;C:/Program Files/Java/jre6/bin;C:/Program Files/Java/jre6/lib/i386;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;;C:\Program Files\Java\jre1.6.0_07\bin;C:\Program Files\Android\android-sdk-windows\tools;C:\Program Files\TortoiseSVN\bin
USERNAME=BKonwar
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 6 Model 15 Stepping 13, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 3
CPU:total 2 (2 cores per cpu, 1 threads per core) family 6 model 15 stepping 13, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3
Memory: 4k page, physical 2085780k(1286036k free), swap 4024188k(3249652k free)
vm_info: Java HotSpot(TM) Client VM (16.3-b01) for windows-x86 JRE (1.6.0_20-b02), built on Apr 12 2010 13:52:23 by "java_re" with MS VC++ 7.1 (VS2003)
time: Wed May 25 10:02:24 2011
elapsed time: 21 seconds
Regards,
Bhabs
Edited by: 861222 on May 25, 2011 12:19 AM

861222 wrote:
# A fatal error has been detected by the Java Runtime Environment:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0351fe3b, pid=1664, tid=3832Not much to tell here. This line here looks suspiciously like a null-pointer error happening in the native code. It is impossible to say how, where and why. Go back to your code and start debugging I'd say, see where invalid data can be passed to the native code.

"Java Virtual Machine not loaded"

I get this message every time I boot up. It just started recently. Anyone know how to fix that? Everything seems to run okay, but that annoying box pops up every time.
"Java Virtual Machine not loaded"
Thanks in advance.
kar

To state the obvious:
1 - Install JAVA
2 - Java is installed: change your PATH vaialbe to point to the folder with JAVA.EXE in it.
3 - check to be sure your CLASSPATH variable is correct -- this will not give you the error you describe, but it will make other things very anoying.
4 - If everything in 1-3 look good, then uninstall, delete any remaining JAVA folders and reboot (cold boot), and then re-install JAVA and pay attention to any errors that may be generated (It sounds like something messed up your install before).

There is no java virtual machine in Mountain Lion?

I try to access a .jar file typing "java -jar <file name> in Terminal, but I received the following message:
"Could not create the Java virtual machine"
Some help, please.

OK, David, thank you very much. The default version is Java 6, but Java 7 appears as the version to be used with Safari and Firefox (but not with Chrome, as this one is 32 bit based).
One can see that version 7 is installed in the System Preferences, as shown in the window.
How do I know if I have Java installed on my Mac?
Mac OS X 10.6 and below: Apple's Java comes pre-installed with your Mac OS.
Mac OS X 10.7 (Lion) and above: Java is not pre-installed with Mac OS X versions 10.7 and above. To get the latest Java 7 from Oracle, you will need Mac OS X 10.7.3 and above.
If you have Java 7, you will see a Java icon under System Preferences.
Java versions 6 and below are listed in the Java Preferences.app located in the Applications > Utilities folder on your Mac.

Unable to create an instance of the Java Virtual Machine

I hope someone can help me to encounter this problem. Well, I have read the instruction over and over on how to setup SQL Developer.
The version i have installed Oracle Database 11g Express Edition and downloaded sqldeveloper-4.0.0.13.80-no-jre and the jdk version 1.7.0_45. Problem is when setup oracle sql developer, pop-up screen highlight on
Unable to create an instance of the Java Virtual Machine
Located at path : C:\Program Files/Java/jdk1.7.0_45\jre\bin\client\jvm.dlll.
I have select the path earlier stage and direct to the C:\Program Files/Java/jdk1.7.0_45 ONLY FOLDER. It turns out to this error.
At the cmd screen error message as below :
Error occurred during initialization of VM
Could Not reserve enough space for object heap
Anyone do give me advise on how to solve this issue. Thank's alot.

What I did was:
Use
Windows Explorer to browse to C:\Users\user\AppData\Roaming\sqldeveloper\1.0.0.0.0Open
product.conf with wordpad
Go
to the bottom of the file
Uncomment
the 32 bit entry and change it to:Add32VMOption -Xmx512m

Saving files and future Java Virtual Machine updates questions

So I've made A program that keeps a list of Ingredients and Recipes for my dads small business. This program is currently on 3 computers my dads, the secretaries, and mine. I made it so it saved and loaded from a shared folder in the network where all the computers has access. The secretary and my dads computer saved and loaded the program fine with changes from one to the other, but mine wouldn't. If I save what information I put on my computer the other computers could no longer load the save file. If i saved something on the secretary or dads computer then my computer would not be able to load the file.
well i solved this problem by re downloading Java virtual machine on my computer.
this brings me to my question:
Will future virtual machine updates make it so the program can't read old .dat files (I've been using ObjectInputStreams and ObjectOutputStreams to save and load)
Sorry for the long story before the question I just wanted to state how I came to the question.

Yes, absolutely. That is one of the problems with using serialization to save data. Fortunately the serialization tutorial mentions it and explains some strategies for minimizing the problem. So have a look at that tutorial.

How to increase java virtual machine.. i am using Ocj4 server

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