Clear memory in my web application

HI,
In my web application I need to keep the memory as much minimum as possible. among the 2 gb memory when all the componnets of my application are running it takes 300 MB. Is there anyway that I could flush out the unused memory from the jvm.
Garbage colllector will take care of that but I have some other requirement where I need more memory hence I would to flush the unused memory periodically
Thanks,
R.Ramesh.

GC will worry about it. Don't worry about it yourself.
If you run out of memory, then the GC has really already done its work. Trust it. There is simply nothing more to free. So either your code is simply eating/leaking memory or you really need to supply more memory.

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How to capture memory usage for web application

In OATS openscripts, how to capture memory usage for web application? Does it have the exisitng java method that we can call to get the memory data (e.g. peak bytes, private bytes) consumed by web application?

JProbe

Memory Leak in web application created using j2ee

Hi,
Our company has one web application, provided by "X" vendor. this application has many JSPs and many TLDs used. The basic behaviour of the apoplication is to connect to the database (Oracle) get the information and show it to the user.
We deployed this web application in Tomcat 5.0.25 in the windows environment. One thing we observed here is, when we login to the application the tomcat5.exe process increses its memory. and when we logout, it does not come down to the original position. similar things happen when we search for some of the data using there provided searches.
We have some code developed which uses httpclient to login to this web application (created for performace testing). This code initially logs in 50 users which goes fine, then logs in 100 users which also goes fine but after this 100 users we ran the code for 50 users agian but this time it threw OutOfmemory exception:Java heap space error.
we are observing the memory in the Task Manager in windows.
Can anyone tell me what could be the cause of this? is it the web application causing problem or is tomcat caching some pages into the memory and is not releasing them?

Hi,
Few questions!
1> Have you tweaked your jvm?
2> What are the values given for Xms and Xmx?
3> What is the size of XX:MaxPermGen?
4> How much RAM is available on the system where you have deployed your app?
5> Are you using pre-complied JSPs for faster response?
6> Which JDK are you using?
7> Have you tried using latest version of Tomcat?
8> If these doesnt help, use any profiler to find the leak. <JProfiler, JVMTI, YourKit profiler etc>
I hope answering these questions would help you :)
njoy!

Java Memory Monitoring in Web Application

Hi All,
Request you to please review the below mentioned suggestion and provide inputs:
Over the years, I have been involved in some projects involving web development in J2ee. JAVA memory usage is an issue that is common amongst all.
Following are some of the questions that come across to a developer regarding the JAVA memory:
Memory Usage Statistics.
Trending of Memory statistics.
Memory Leak.
Performance optimization in case memory leaks occur.
When it comes to answering the above, the most common suggestion is to enable heap dumps and analyze it using a heap analyzer tool. However, there are times and projects where these options are not approved off and developer is always asked to review code again and again. This is again a frustrating option for someone who has just joined a maintenance project and reading through code is not a feasible option. It has happened to me and I did the following to solve some of my problems and eventually all.
Instead of analyzing heap dumps, I decided to do the following:
Add a request filter to my J2EE application.
Add following log statements in the filter:
URL fired.
Runtime.getRuntime().freeMemory()
Runtime.getRuntime().totalMemory()
Runtime.getRuntime().maxMemory()
Gather data from daily app usage and build some trending statistics.
Not only were we able to decide an optimum memory setting for our server, we were able to detect leaks as well. However, i agree detecting leaks wasn't as simple as it's with other tools considering the debugging effort that's involved.It is not a conventional approach but come sin handy when projects don't want to involve costs and maintain equilibrium at production systems as well.

Hi,
Few questions!
1> Have you tweaked your jvm?
2> What are the values given for Xms and Xmx?
3> What is the size of XX:MaxPermGen?
4> How much RAM is available on the system where you have deployed your app?
5> Are you using pre-complied JSPs for faster response?
6> Which JDK are you using?
7> Have you tried using latest version of Tomcat?
8> If these doesnt help, use any profiler to find the leak. <JProfiler, JVMTI, YourKit profiler etc>
I hope answering these questions would help you :)
njoy!

Unable to clear memory in C++ Managed application

I have written a win32 project and it internally calls C# forms(using /clr) to do few tasks.
Once the task is completed, the form is closed. But the problem is what ever memory is allocated after loading C# form is not getting cleaned up. I tried GC.Collect() in C# code to force the cleanup, but of no use.
Can anyone help me in resolving the issue?
C# code:public void close()
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
C++ code:
frm = gcnew libry::Form1();
frm->ShowDialog();
frm->close();
delete frm;
frm = nullptr;
- Shiva.

The memory allocated with gcnew in C++/CLR or with new in C# does not have to be freed programmatically, since it is managed by the system. If you need an explicit management, then also call
WaitForFullGCComplete before WaitForPendingFinalizers.
Memory leaks can be caused by incorrect management of native resources, such as allocations with
new or malloc in C++, which are not freed in the finaliser, which is a special member defined with “!”:
https://msdn.microsoft.com/en-us/library/ms177197(v=vs.100).aspx.
False leaks can be caused by missing using statements in C# or missing calls of
Dispose().
Do you really need to call Collect explicitly and do you have some suspicious native resources?

Difference Between Web application design and Report Designer

Hi,
I have searched in the forum as well i Google it but still i am not clear the difference between Web application Designer and report Designer , why especially we go for WAD ? and what is not possible in Report designer which we can do in WAD Please some one explain me that would be great helpful to me. i am having lot of confusion in this issue.
thanks,
Gal

Hi,
The Report designer is completely for formating of your query and results. Here you have the flexibility to design your query(one/more) results in your own way.
The WAD is for displaying various web items at one short for a single/multiple query. And here you have the flexibility to do the XML coding on the web items, but not as much you have the flexibility on Report Designer.
But, Report designer will have more performance issues than WAD. So, generally it helps when you need extreme formating of your reports.
Hope this clears your doubt.
Regards,
Srinivas.

Not able to clear session of web application running inside wpf browser control

Hi,
I have used below code to clear session of web application running inside wpf browser control .
[DllImport("wininet.dll", SetLastError = true)]
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);
InternetSetOption(IntPtr.Zero, INTERNET_OPTION_END_BROWSER_SESSION, IntPtr.Zero, 0);
This code is working in Windows 8 but it is not working in windows 7 and windows 8.1.
I want to know why it is not working and how to make it work in windows 7 and windows 8.1
Please help.
Thanks & Regards,
Pritesh

Hi,
I have used below code to clear session of web application running inside wpf browser control .
[DllImport("wininet.dll", SetLastError = true)]
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);
InternetSetOption(IntPtr.Zero, INTERNET_OPTION_END_BROWSER_SESSION, IntPtr.Zero, 0);
This code is working in Windows 8 but it is not working in windows 7 and windows 8.1.
I want to know why it is not working and how to make it work in windows 7 and windows 8.1
Please help.
Thanks & Regards,
Pritesh

Memory Monitor API for web application

Hello All,
Does any one knows any API for monitoring memory of a certain web application ??
Thanks in advance

Are there any other ways to monitor jvm state besides JMX? I wonder if there is a specific API to monitor jvm's memory. JMX is the specific API used to create software that monitors the memory in the JRE.
If you want to monitor memory of an application, and don't feel like writing a program to monitor memory, you can use the JConsole application that comes with the Java JDK.

Need information about Pricing details of deploying the web application in Amazon EC2 cloud and deploying procedure clearly

Can anybody give in detail explanation about deploying the asp.net web application into Amazon Cloud, which is using SQL Server as a database. I want the pricing information about the Amazon Cloud.
Before that this web application is used in Intranet environment.
Regards,
Hanife

"explanation about deploying the asp.net web application into Amazon Cloud,"
You'll need to contact Amazon tech support for that information.
"I want the pricing information about the Amazon Cloud."
Again, only Amazon can give you definitive pricing information. Start here:
http://aws.amazon.com/
Thanks for understanding.

Create a new web application, how shall I update the file server.xml

Hi,
I will create a new web application, i.e named newApp. Then I create a file structure as follows:
- <server-root>/newApp
- <server-root>/newApp/WEB-INF
- <server-root>/newApp/WEB-INF/classes
Then I must tell the server that I have created a new web application. Then I must update my file server.xml, How shall I do this and where in the file shall I type in the new information?
I use windows XP Pro, and Tomcat 4.1.27.
My server.xml file looks like below:



<Server port="8005" shutdown="SHUTDOWN" debug="0">


<Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"
debug="0"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
debug="0"/>

<GlobalNamingResources>

<Environment name="simpleValue" type="java.lang.Integer" value="30"/>

<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved">
</Resource>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>


<Service name="Tomcat-Standalone">


<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8080" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="100" debug="0" connectionTimeout="20000"
useURIValidationHack="false" disableUploadTimeout="true" />




<Connector className="org.apache.coyote.tomcat4.CoyoteConnector"
port="8009" minProcessors="5" maxProcessors="75"
enableLookups="true" redirectPort="8443"
acceptCount="10" debug="0" connectionTimeout="0"
useURIValidationHack="false"
protocolHandlerClassName="org.apache.jk.server.JkCoyoteHandler"/>












<Engine name="Standalone" defaultHost="localhost" debug="0">



<Logger className="org.apache.catalina.logger.FileLogger"
prefix="catalina_log." suffix=".txt"
timestamp="true"/>


<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
debug="0" resourceName="UserDatabase"/>







<Host name="localhost" debug="0" appBase="webapps"
unpackWARs="true" autoDeploy="true">





<Logger className="org.apache.catalina.logger.FileLogger"
directory="logs" prefix="localhost_log." suffix=".txt"
timestamp="true"/>

<DefaultContext reloadable="true"/>

<Context path="" docBase="ROOT" debug="0"/>

<Context path="/examples" docBase="examples" debug="0"
reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_examples_log." suffix=".txt"
timestamp="true"/>
<Ejb name="ejb/EmplRecord" type="Entity"
home="com.wombat.empl.EmployeeRecordHome"
remote="com.wombat.empl.EmployeeRecord"/>




<Environment name="maxExemptions" type="java.lang.Integer"
value="15"/>
<Parameter name="context.param.name" value="context.param.value"
override="false"/>
<Resource name="jdbc/EmployeeAppDb" auth="SERVLET"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/EmployeeAppDb">
<parameter><name>username</name><value>sa</value></parameter>
<parameter><name>password</name><value></value></parameter>
<parameter><name>driverClassName</name>
<value>org.hsql.jdbcDriver</value></parameter>
<parameter><name>url</name>
<value>jdbc:HypersonicSQL:database</value></parameter>
</ResourceParams>
<Resource name="mail/Session" auth="Container"
type="javax.mail.Session"/>
<ResourceParams name="mail/Session">
<parameter>
<name>mail.smtp.host</name>
<value>localhost</value>
</parameter>
</ResourceParams>
<ResourceLink name="linkToGlobalResource"
global="simpleValue"
type="java.lang.Integer"/>
</Context>
</Host>
</Engine>
</Service>
</Server>

To use servlets u have indeed to update your web.xml...Well I'm not sure this is relevant to your case anyway.
You have to add a <servlet> element to this file.
Something like this:
<servlet>
<servlet-name>blabla</servlet-name>
<servlet-class>blablapackage.Blablaclass</servlet-class>
<init-param>...</init-param>
</servlet>
Now this may not solve your problem. Make sure you refer to your servlets using their full qualified names.btw, just to be sure, what is your definition of "servlet"? (i mean: any java class or only javax.servlet.Servlet)

One Search service application for multiple web applications in a single server

We are planning to host 17 Web applications in a single Server. Do I need to create search service application for each web application or I need to create one Search service application , create a Content source for each web
application and create a Result source for filtering. Which is the best approach. And which approach takes more RAM memory.
In my application I am using Search web part, "Recently Changed Items", "Popular Items" web parts. when I created only one one Search Service application for all web applications and using Result sources ,
I am not getting the results. What could be the problem.

Hi,
One SSA is ok, but you should think about access rights. If the access is clear cut between all the web apps you should be ok with one SSA. Multiple result sources limiting on content source also works, but could easily be bypassed.
Multiple SSA's will eat up RAM/CPU like a mother :)
As for popular etc.. it could be due to how those sources are set up, but haven't investigated or tested this much.
Thanks,
Mikael
Search Enthusiast - SharePoint MVP/MCT/MCPD - If you find an answer useful, please up-vote it.
http://techmikael.blogspot.com/
Author of Working with FAST Search Server 2010 for SharePoint

"heap limit" - or the death of a perfectly sound web application ;-)

hi everyone,
i am running a web app on tomcat 6. There is this specfic feature in the web application where i need to parse data from a csv file and programatically place data in an excel file.
i am using these api's :
jexcelapi
ostermillerutil
here is the code
// Parsing CSV file
          CSVParser p = new CSVParser(in);
          p.setCommentStart("#;!");
          p.setEscapes("nrtf", "\n\r\t\f");
          String[] line = null;
          Label label = null;
          WritableSheet sheet = writeWorkbook.createSheet("Data", 0);
          int rowCount = 0;
          try {
               while ((line = p.getLine()) != null) {
                    for (int column=0; column < line.length; column++) {
                         try {
                              label = new Label(column,rowCount, line[column]);
                              sheet.addCell(label);
                         } catch (RowsExceededException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                         } catch (WriteException e) {
                              // TODO Auto-generated catch block
                              e.printStackTrace();
                    rowCount++;
          catch (IOException e) {
                    e.printStackTrace();
          }the problem is a quite outOfMemory error cause in the while loop.
Its clear that the amout of data (aprox. 26000 rows of data - about 100megs of data) is the problem. My question is any of you can see anything i could optimize the loop with so that the app wont burst ;-)
yours,
Jazz

the problem is a quite outOfMemory error cause in the
while loop.
Its clear that the amout of data (aprox. 26000 rows
of data - about 100megs of data) is the problem. I have a great problem understanding why you need to process 100megs of data in a web application since you are unlikely to be shipping the 100megs to the client for display. I can only see some sense to it if your web application is offering a conversion service but even then you will still have an upload of 100megs followed by a download of 100megs. If you are offering a conversion service then because of the memory requirement you will probably be limited to just one client at a time anyway.
Not what you would call a sound scalable solution to a problem.

N8 I have insufficient memory by pressing web icon...

n8 I have insufficient memory by pressing web icon. no other application is running! is there any way to help me?
Solved!
Go to Solution.

Clear the Browser Cache and try..
--------------------------------------------------------------------------------------------------------------------------------------------------------------If you find this helpful, pl. hit the White Star in Green Box...

Why it take so long to start the SAP Web Application Server?

As I read from the doc that starting the SAP Web Application Server will take from 25 to 40 minutes, I don't believe. But as I try it on my machine, it does take really so long. Isn't it a wonder?
I am used to work with Tomcat, JBoss, BEA etc. None of them will take so long.

Hi Chen,
In a WAS I assume that it has dual stack (ABAP + JAVA)
For the startup of a ABAP Stack it generally takes about 2 minutes or so.
And for the WAS JAVA STACK should take around 8 to 15 minutes depending on the application, services and hardware sizing.
The reason for the long time required for a WAS Java Stackis:
JAVA Stack depends on three diffrent components: a) dispatcher(java) b)SDM c) Server0 process.
Now before the execution of all these the first thing what happens is the initializastion of jcontrol which inturn initiates the java bootstrap process.
At this moment of time the JVM environment takes some time for the loading and memory management. Once the JVM is loaded successfully then only the three compnents (SDM, dispatcher and server0) are initiated to run.
The SDM and dispatcher do started up with a couple of services and hence require not toomuch of time.
But the main component i.e Server0 process consumes a lot of time to startup at it requires many of the Java stack services to start before it reaches running state.
Again the port configuration for HTTP for SDM , dispatcher , server0 and java process also takes place.
So this was an overview for the Time required for a WAS Stack to come up in operational condition.
Apart from this , seeing specifically to your scenario, wherein it takes 25 - 40 minutes could be an issue with the Hardaware sizing of the Server and the Sofware compnents / tools loaded. We might need to analyze it in more detail to get a clear picture.
I hope this helps you!
Regards,
Prem

Capture an image using the web camera from a web application

Hi All,
Could anyone please share the steps what have to be followed for capture an image using the web camera from a web application.
I have a similar requirement like this,
1) Detect the Webcam on the users machine from the web application.(To be more clear when the user clicks on 'Add Photo' tool from the web application)
2) When the user confirms to save, save the Image in users machine at some temporary location with some unique file name.
3) Upload the Image to the server from the temporary location.
Please share the details like, what can be used and how it can be used etc...
Thanks,
Suman

1) Detect the Webcam on the users machine from the web application.(To be more clear when the user clicks on 'Add Photo' tool from the web application)There's not really any good way to do this with JMF. You'd have to somehow create a JMF web-start application that will install the native JMF binaries, and then kick off the capture device scanning code from the application, and then scan through the list of devices found to get the MediaLocator of the web cam.
2) When the user confirms to save, save the Image in users machine at some temporary location with some unique file name.You'd probably be displaying a "preview" window and then you'd just want to capture the image. There are a handful of ways you could capture the image, but it really depends on your situation.
3) Upload the Image to the server from the temporary location.You can find out how to do this on google.
All things told, this application is probably more suited to be a FMJ (Freedom for Media in Java) application than a JMF application. JMF relies on native code to capture from the web cams, whereas FMJ does not.
Alternately, you might want to look into Adobe Flex for this particular application.

Clear memory in my web application

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