What is the best way to verify default heap size in Java
Hi All,
What is the best way to verify default heap size in Java ? does it vary over JVM to JVM . I was reading this article http://javarevisited.blogspot.sg/2011/05/java-heap-space-memory-size-jvm.html , and it says default size is 128 MB but When I run following code :
public static void main(String args[]) {
int MB = 1024*1024;
System.out.println(Runtime.getRuntime().totalMemory()/MB);
It print "870" i.e. 870 MB.
I am bit confused, what is the best way to verify default heap size in any JVM ?
Edited by: 938864 on Jun 5, 2012 11:16 PM
938864 wrote:
Hi Kayaman,
Sorry but I don't agree with you on verification part, Why not I can verify it ? to me default means value when I don't specify -Xms and -Xmx and by the way I was testing that program on 32 bit JRE 1.6 on Windows. I am also curious significant difference between 128MB and 870MB I saw, do you see anything obviously wrong ?That spec is outdated. Since Java 6 update 18 (Sun/Oracle implementation) the default maximum heap space is calculated based on total memory availability, but never more than 1GB on 32 bits JVMs / client VMs. On a 64 bits server VM the default can go as high as 32gb.
The best way to verify ANYTHING is to address multiple sources of information and especially those produced by the source, not some page you find on the big bad internet. Even wikipedia is a whole lot better than any random internet site IMO. That's common sense, I can't believe you put much thought into it that you have to ask in a forum.
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What is the best way to implement default values stored in a DB table?
[JHeadstart 10.1.3 build 78]
[JDeveloper 10.1.3 SU4]
We are struggling on how to best implement default values that are stored in a DB table. What we have is a database table with (CODE_TYPE, TABLE_NAME, COLUMN_NAME, DEFAULT_VALUE) as columns. This way the application administrator can administer default values himself/herself. Now we need to find the best way to set these table supplied default values in new rows. Globally we are aware of two ways:
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FROM v_default_values
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ToineSteven,
Thanks for the reply. Unfortunately whatever we try, we cannot get it to work. We started looking at the second option (since we do need default values also in table lay-out new rows). We created a DefaultValues ViewObject, added it to the Application Module, added an EL expressiona to the Default Display Value property (replacing your ending ")" with a "}" offcourse ;-)), ran the JAG so that a page definition was generated for DefaultValues and we managed to get it prepared when loading for example the Organisation's jspx page. However no default value appears in a new row (not in Form, not in Table layout).
I then created a quick application on top of the HR schema, added a DefaultValues ViewObject using one calculated attribute (set Salary fixed to 1000), added the EL expression to the Salary Default Display Value property in the Employees Group, made sure the DefaultValuesPageDef is prepared by adding it to the parameter section and I see it getting prepared. I also see a managed Bean is created in the Employees-bean.xml.
In the Embedded OC4J log we see:
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2006-08-02 16:01:01.825 WARNING [ADFc] Warning: No Method onCreateEmployees and no actionBinding CreateEmployees found.
Is it this warning we should be worried about? Since no default value is created.
The managed bean (Employees-beans.xml) looks like:
<?xml version="1.0" encoding="windows-1252"?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
<faces-config xmlns="http://java.sun.com/JSF/Configuration">
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<managed-bean-name>CreateEmployeesDefaultValues</managed-bean-name>
<managed-bean-class>oracle.jheadstart.controller.jsf.bean.DefaultValuesBean</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>iteratorBinding</property-name>
<value>#{bindings.EmployeesIterator}</value>
</managed-property>
<managed-property>
<property-name>defaultValues</property-name>
<map-entries>
<map-entry>
<key>Salary</key>
<value>#{data.DefaultValuesPageDef.DefaultValuesIterator.currentRow.Salary}</value>
</map-entry>
</map-entries>
</managed-property>
<managed-property>
<property-name>actionResult</property-name>
<value>CreateEmployees</value>
</managed-property>
</managed-bean>
<managed-bean>
<managed-bean-name>searchEmployees</managed-bean-name>
<managed-bean-class>oracle.jheadstart.controller.jsf.bean.JhsSearchBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>bindings</property-name>
<value>#{data.EmployeesPageDef}</value>
</managed-property>
<managed-property>
<property-name>searchBinding</property-name>
<value>#{data.EmployeesPageDef.advancedSearchEmployees}</value>
</managed-property>
<managed-property>
<property-name>searchAttribute</property-name>
<value>EmployeeId</value>
</managed-property>
<managed-property>
<property-name>dataCollection</property-name>
<value>EmployeesView1</value>
</managed-property>
<managed-property>
<property-name>autoquery</property-name>
<value>true</value>
</managed-property>
</managed-bean>
<managed-bean>
<managed-bean-name>EmployeesCollectionModel</managed-bean-name>
<managed-bean-class>oracle.jheadstart.controller.jsf.bean.JhsCollectionModel</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
<managed-property>
<property-name>jhsPageLifecycle</property-name>
<value>#{jhsPageLifecycle}</value>
</managed-property>
<managed-property>
<property-name>bindings</property-name>
<value>#{bindings}</value>
</managed-property>
<managed-property>
<property-name>rangeBinding</property-name>
<value>#{bindings.EmployeesTable}</value>
</managed-property>
<managed-property>
<property-name>defaultValues</property-name>
<value>#{CreateEmployeesDefaultValues.defaultValues}</value>
</managed-property>
</managed-bean>
</faces-config>
This is the DefaultValues.xml:
<?xml version='1.0' encoding='windows-1252' ?>
<!DOCTYPE ViewObject SYSTEM "jbo_03_01.dtd">
<ViewObject
Name="DefaultValues"
BindingStyle="OracleName"
CustomQuery="true"
ComponentClass="hr.model.DefaultValuesImpl"
UseGlueCode="false" >
<DesignTime>
<Attr Name="_version" Value="10.1.3.36.73" />
<Attr Name="_codeGenFlag2" Value="Access|Coll|VarAccess" />
</DesignTime>
<ViewAttribute
Name="Salary"
IsUpdateable="false"
IsPersistent="false"
Precision="255"
Type="java.lang.String"
ColumnType="VARCHAR2"
AliasName="SALARY"
Expression="1000"
SQLType="VARCHAR" >
</ViewAttribute>
</ViewObject>
The PageDef for Defaultvalues is like:
<?xml version="1.0" encoding="UTF-8" ?>
<pageDefinition xmlns="http://xmlns.oracle.com/adfm/uimodel"
version="10.1.3.36.73" id="DefaultValuesPageDef"
Package="hr.view.pagedefs" EnableTokenValidation="false">
<parameters/>
<executables>
<iterator id="DefaultValuesIterator"
Binds="AppModuleDataControl.DefaultValues1"
DataControl="AppModuleDataControl" RangeSize="10"/>
</executables>
<bindings>
<attributeValues id="DefaultValuesSalary"
IterBinding="DefaultValuesIterator">
<AttrNames>
<Item Value="Salary"/>
</AttrNames>
</attributeValues>
<table id="DefaultValuesTable" IterBinding="DefaultValuesIterator">
<AttrNames>
<Item Value="Salary"/>
</AttrNames>
</table>
<action id="FirstDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="12"/>
<action id="PreviousDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="11"/>
<action id="NextDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="10"/>
<action id="LastDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="13"/>
<methodAction RequiresUpdateModel="true" Action="999"
id="advancedSearchDefaultValues"
IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl"
InstanceName="AppModuleDataControl.dataProvider"
MethodName="advancedSearch"
ReturnName="AppModuleDataControl.methodResults.AppModuleDataControl_dataProvider_advancedSearch_result"
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<NamedData NDName="viewObjectUsage"
NDValue="#{searchDefaultValues.dataCollection}"
NDType="java.lang.String"/>
<NamedData NDName="arguments" NDValue="#{searchDefaultValues.arguments}"
NDType="java.util.ArrayList"/>
<NamedData NDName="allConditionsMet"
NDValue="#{searchDefaultValues.allConditionsMet}"
NDType="java.lang.Boolean"/>
</methodAction>
<action id="setCurrentRowWithKeyDefaultValues"
IterBinding="DefaultValuesIterator"
InstanceName="AppModuleDataControl.DefaultValues1"
DataControl="AppModuleDataControl" RequiresUpdateModel="false"
Action="96">
<NamedData NDName="rowKeyStr" NDValue="#{row.rowKeyStr}"
NDType="java.lang.String"/>
</action>
<action id="CreateDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="40"/>
<action id="DeleteDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="false"
Action="30"/>
<action id="Commit" RequiresUpdateModel="true" Action="100"
DataControl="AppModuleDataControl"/>
<action id="Rollback" RequiresUpdateModel="false" Action="101"
DataControl="AppModuleDataControl"/>
</bindings>
</pageDefinition>
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Toine -
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http://www.intel.com/design/flash/nand/mainstream/index.htm
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JQ
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5. Avoid malware. Malware is malicious software that circulates on the Internet. This kind of attack on OS X was once so rare that it was hardly a concern, but malware is now increasingly common, and increasingly dangerous.
There is some built-in protection against downloading malware, but you can’t rely on it — the attackers are always at least one day ahead of the defense. You can’t rely on third-party protection either. What you can rely on is common-sense awareness — not paranoia, which only makes you more vulnerable.
Never install software from an untrustworthy or unknown source. If in doubt, do some research. Any website that prompts you to install a “codec” or “plugin” that comes from the same site, or an unknown site, is untrustworthy. Software with a corporate brand, such as Adobe Flash Player, must come directly from the developer's website. No intermediary is acceptable, and don’t trust links unless you know how to parse them. Any file that is automatically downloaded from the web, without your having requested it, should go straight into the Trash. A web page that tells you that your computer has a “virus,” or that anything else is wrong with it, is a scam.
In OS X 10.7.5 or later, downloaded applications and Installer packages that have not been digitally signed by a developer registered with Apple are blocked from loading by default. The block can be overridden, but think carefully before you do so.
Because of recurring security issues in Java, it’s best to disable it in your web browsers, if it’s installed. Few websites have Java content nowadays, so you won’t be missing much. This action is mandatory if you’re running any version of OS X older than 10.6.8 with the latest Java update. Note: Java has nothing to do with JavaScript, despite the similar names. Don't install Java unless you're sure you need it. Most people don't.
6. Don't fill up your boot volume. A common mistake is adding more and more large files to your home folder until you start to get warnings that you're out of space, which may be followed in short order by a boot failure. This is more prone to happen on the newer Macs that come with an internal SSD instead of the traditional hard drive. The drive can be very nearly full before you become aware of the problem.
While it's not true that you should or must keep any particular percentage of space free, you should monitor your storage use and make sure you're not in immediate danger of using it up. According to Apple documentation, you need at least 9 GB of free space on the startup volume for normal operation.
If storage space is running low, use a tool such as OmniDiskSweeper to explore the volume and find out what's taking up the most space. Move seldom-used large files to secondary storage.
7. Relax, don’t do it. Besides the above, no routine maintenance is necessary or beneficial for the vast majority of users; specifically not “cleaning caches,” “zapping the PRAM,” "resetting the SMC," “rebuilding the directory,” "defragmenting the drive," “running periodic scripts,” “dumping logs,” "deleting temp files," “scanning for viruses,” "purging memory," "checking for bad blocks," "testing the hardware," or “repairing permissions.” Such measures are either completely pointless or are useful only for solving problems, not for prevention.
To use a Mac effectively, you have to free yourself from the Windows mindset that every computer needs regular downtime maintenance such as "defragging" and "registry cleaning." Those concepts do not apply to the Mac platform. A computing device is not something you should have to think about very much. It should be an almost transparent medium through which you communicate, work, and play. If you want a machine that is always whining for your attention like a neurotic dog, use a PC.
The very height of futility is running an expensive third-party application called “Disk Warrior” when nothing is wrong, or even when something is wrong and you have backups, which you must have. Disk Warrior is a data-salvage tool, not a maintenance tool, and you will never need it if your backups are adequate. Don’t waste money on it or anything like it. -
What is the best way to transfer my music library from my windows pc to my new macbook air?
what is the best way to transfer my large iTunes library from my windows pc to my new macbook air? Not all purchased, many from CDs I owned
Moving a library: Quick answer if you use iTunes' default preferences settings: Copy the entire iTunes folder (and in doing so all its sub-folders and files) intact to the other drive. Hold down the option (alt) key (shift on Windows) and open iTunes. At the prompt to create or choose a library choose the copied iTunes folder.
If this is to a new computer and you put the copied iTunes folder in the default location of Macintosh HD > Users > *User Name* > Music then you don't even need to start with the option key held down, iTunes will automatically look for it there. (Make sure there isn't anything already in the iTunes folder there that you want to keep since you will be replacing it with the one you are moving.)
Windows users see tip at: https://discussions.apple.com/message/18879381#18879381
Consider moving everything from your Windows PC to your Mac in a single move, including your iTunes library: About Windows Migration Assistant - http://support.apple.com/kb/ht4796 - Learn about how to use Windows Migration Assistant to migrate your files from a Windows PC to a Mac. -
What is the best way to protect my macbook pro? should I install mackeeper? Thank you :)
what is the best way to protect my macbook pro? should I install mackeeper? Thank you
MacKeeper is malware that charges a fee. Do not install it under any circumstances.
Keep your software up-to-date with Software Update.
Don't click on links in emails, retype the URLs to be sure you know where it is sending you.
Don't download a "codec" or program to view content on a website from the same site -- standard viewers should come from the codec developer's site, not the content site.
Don't fall for requests from your bank or PayPal to verify your information -- they don't do it that way.
Download Flash only from:
http://get.adobe.com/flashplayer/
You did NOT win any contests you did not enter, and you are not the 10,000th vistitor to any site. -
What is the best way to record a video(not big) for free on a mac w/isight?
What is the best way to record a video(not big) for free on a mac w/isight? I need to just make a short (less than 5 minute, no special effects) video, but I can't figure out any programs that will make this possible for me.
Thanks.Hi Carolyn,
you can use iMovie to record a video for free on a Mac with iSight.
1. Open iMovie HD
2. Choose “Create a new project”
3. Name the project for example “iSight Movie” (first field). In the second field, let the default location “Sequences”, in the third one, video format, choose “iSight”. Push “Create”
4. iMovie window opens, next to the scissors, choose the camera (Camera mode), then iSight. Now you appear on the screen, right?
5. Press “Record with iSight” in the main picture window.
6. Press the same button to stop. Your new clip appears now in the clip panel at the right.
7. You are done!
iMac G5 PPC 2,1 Ghz Mac OS X (10.4.8) -
What is the best way to deal with memory leak issue in sql server 2008 R2
What is the best way to deal with memory leak issue in sql server 2008 R2.
What is the best way to deal with memory leak issue in sql server 2008 R2.
I have heard of memory leak in OS that too because of some external application or rouge drivers SQL server 2008 R2 if patched to latest SP and CU ( may be if required) does not leaks memory.
Are you in opinion that since SQL is taking lot of memory and then not releasing it is a memory leak.If so this is not a memory leak but default behavior .You need to set proper value for max server memory in sp_configure to limit buffer pool usage.However
sql can take more memory from outside buffer pool if linked server ,CLR,extended stored procs XML are heavily utilized
Any specific issue you are facing
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers -
What is the best way to share the High Res images ...
What is the best way to share the High Res images on my Nokia Lumia 1020? My Android friends really want to see the original ~12MB images taken with Nokia Pro Camera?
-Paul
Solved!
Go to Solution.if you have the att device, then use your att locker.
ANYONE can sign up for the att locker here:
https://locker.att.net/app/#welcome
even if you do not have ATT service, you should sign up NOW.
There is an application that is pre-installed to allow for the 1020 to upload the full resolution files to the AT&T locker.
AND, because they are launching the 1020, they are giving a free upgrade to the account to the 50GB box instead of the 5GB.
they are doing this for a limited time only, I have created a couple of accounts.
after you create your account, it will have to be verified. after you check your email and verify the box, log back in and you will see it is only a 5gb account.
click on "my Account/upgrade" and choose the 50GB and you should see it say FREE under the cost.
then you can upload the full res pictures and share them that way.
otherwise, if you are within reach, try Bluetooth transfer. -
What is the best way to replay a slide?
What is the best way to replay a slide? The 'Rewind' button in the default player skins restarts the course from the begining. Is there a way to set a custom button to replay a slide without restarting the course?
Do you want it on each slide? Are you on CP7 or 6? Create a shape button: you can do it either on the master slide, or on the first slide timed for the rest of the project. Be sure to put it on top if it could be covered by other projects. Create this advanced (or shared action on CP7 if you want to reuse in future projects):
Lilybiri
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