OutOfMemoryError: Java heap space, with lots of heap space left

Hello. I've been seeing my web app (running on Linux) start to throw OutOfMemoryError(s) after a few days of running time. The following is the output of jstat -gc every 10 seconds. From the last 8 lines or so, it seems that the eden space is full, but both survivor spaces and the old gen space have plenty of room - it's like garbage collection has stopped, and no memory is getting freed in eden - hence the OutOfMemory errors.
Am I misinterpreting the log output? What could be going on?
thanks.
      Timestamp       S0C         S1C       S0U         S1U         EC           EU             OC         OU         PC         PU         YGC     YGCT       FGC    FGCT      GCT
       593233.4    232960.0   232960.0      0.0         69388.3     233088.0     231023.7     1398144.0   342477.6     49728.0 49379.2 42476     3326.366 9972    7617.863 10944.229
       593243.4    232960.0   232960.0     1968.6       0.0         233088.0     212192.0     1398144.0   343210.3     49728.0 49383.0 42477     3326.375 9972    7617.863 10944.238
       593253.4    232960.0   232960.0      0.0         0.0         233088.0     170145.7     1398144.0   356161.9      49728.0 49408.7 42478     3326.400 9973    7618.741 10945.141
       593263.5    232960.0   232960.0     15776.2      0.0         233088.0     110039.1     1398144.0   356161.9    49728.0 49414.7 42479     3326.427 9973    7618.741 10945.168
       593273.4    232960.0   232960.0      0.0          15136.0     233088.0     50067.5      1398144.0   358475.4     49728.0 49416.4 42480     3326.455 9973    7618.741 10945.196
       593283.4    232960.0   232960.0     15392.0       0.0         233088.0     36674.5      1398144.0   360344.5    49728.0 49416.4 42481     3326.482   9973    7618.741 10945.223
       593293.5    232960.0   232960.0     15392.0       0.0         233088.0     141464.3     1398144.0   360344.5    49728.0 49416.4 42481     3326.482 9973    7618.741 10945.223
       593303.5    232960.0   232960.0      0.0          21440.0    233088.0     84732.7      1398144.0   361733.4    49728.0 49416.4 42482     3326.515   9973    7618.741 10945.256
       593313.5    217472.0   225216.0      0.0          0.0         233088.0     175326.7     1398144.0   366982.4    49792.0 49429.0 42483     3326.527 9974    7619.606 10946.134
       593323.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593333.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593343.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593353.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593363.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593373.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134
       593383.5    217472.0   225216.0      0.0          0.0         233088.0     233080.9     1398144.0   366982.4    49792.0 49429.3 42483     3326.527 9974    7619.606 10946.134

Which java-version are you using - and if its an old one does the problem also happen with the latest jdk5 or 6 update releases.
There have been some bugs which stop the collector for some time but allow allocation, which have been fixed now.
lg Clemens

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My frien google tells me that you use
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Peak Usage: init = 196608(192K) used = 27556992(26911K) committed = 27885568(27232K) max = 33554432(32768K)
PS Eden Space
Type:Heap memory
Usage:init = 22478848(21952K) used = 26278816(25662K) committed = 50069504(48896K) max = 54722560(53440K)
Peak Usage: init = 22478848(21952K) used = 57802752(56448K) committed = 57802752(56448K) max = 58589184(57216K)
Collection Usage:init = 22478848(21952K) used = 0(0K) committed = 50069504(48896K) max = 54722560(53440K)
PS Survivor Space
Type: Heap memory
Usage: init = 3670016(3584K) used = 1082080(1056K) committed = 2424832(2368K) max = 2424832(2368K)
Peak Usage: init = 3670016(3584K) used = 19857256(19391K) committed = 19857408(19392K) max = 19857408(19392K)
Collection Usage: init = 3670016(3584K) used = 1082080(1056K) committed = 2424832(2368K) max = 2424832(2368K)
PS Old Gen
Type: Heap memory
Usage: init = 238616576(233024K) used = 85108712(83113K) committed = 344064000(336000K) max = 477233152(466048K)
Peak Usage: init = 238616576(233024K) used = 477233152(466048K) committed = 477233152(466048K) max = 477233152(466048K)
Collection Usage: init = 238616576(233024K) used = 85108712(83113K) committed = 344064000(336000K) max = 477233152(466048K)
PS Perm Gen
Type: Non-heap memory
Usage: init = 16777216(16384K) used = 71289808(69618K) committed = 71434240(69760K) max = 134217728(131072K)
Peak Usage: init = 16777216(16384K) used = 71289808(69618K) committed = 71696384(70016K) max = 134217728(131072K)
Collection Usage: init = 16777216(16384K) used = 71177496(69509K) committed = 71434240(69760K) max = 134217728(131072K)
And this is runtime prarameter:
-Xrs -server -XX:MaxPermSize=128m -Xms256m -Djava.security.policy=$ORACLE_HOME/j2ee/home/config/java2.policy -Djava.awt.headless=true -Dhttp.webdir.enable=false
Any one can help me?
Rgds.

Think about what happens in your program. If your program loads lots of data into memory of the AS (=heap) and you have lots of users, then you can get errors like this. The obvious solution is to start raising the heapsize, but you cannot do that anymore, since you're out of physical memory.
So with the information I have seen so far, in this case you either have to buy more memory, get less users or refactor your program.

1) OutOfMemoryError: Java heap space 2) Could not create the JVM

Hi guys!
I'm having a lot of memory problems with the java virtual machine and I really need to fix them as soon as I can :(
I was running an heavy application on Eclipse and at the end it stopped saying:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space so I tried to enlarge the memory heap space in various ways... editing eclipse.ini (but I cannot go over a certain quantity), trying to change some parameters as:
-vmargs -XX:MaxPermSize=<memory size>or to launch a jar of my application using :
Java jar Xms1024M Xmx3000M jarnameAnd now the error I got is:
Error occurred during initialization of VM
Could not reserve enough space for object heap
Could not create the Java virtual machine.I just don't know what to do!
I'm using a workstation but I don't have it right now in front of me... it should be a 4 core xeon-64bit having 8 giga of ram, under windows vista.
do you have any suggestions?
many many thanks!
lou

loucat wrote:
I don't know if it requires 3GB, I just know the default memory is not enough... I have to load an index (a Lucene-based one) made up of almost 4 GB of images... I cannot change anything of the code about it :(
Should I have to install a new java version downloading it from this page?
http://www.java.com/en/download/faq/java_win64bit.xml
I would download the 64 bit version from this page:
[http://java.sun.com/javase/downloads/widget/jdk6.jsp]
.. but you should probable be able to find it on java.com as well.

XMLReader : java.lang.OutOfMemoryError: Java heap space

I'm using a XMLReader object to Parse XML files. About 20000 XML documents need to be parsed, so the parse(...) method is called about 20000 times in a loop.
The XML string to be parsed are all about 2500 bytes long. Java 1.5 is used.
import java.io.StringReader;
import org.xml.sax.XMLReader;
private final XMLReader parser;
private StringReader stringReader;
public void myParseMethod(final String xml) {
try {
stringReader = new StringReader(xml);
parser.parse(new InputSource(stringReader));
stringReader.close();
} catch (final SAXParseException e) {
} catch (final SAXException e) {
} catch (final IOException e) {
Calling the method myParseMethod(final String xml) goes well till about 2000 times. Then the following exception is thrown:
java.lang.OutOfMemoryError: Java heap space
at java.io.BufferedWriter.<init>(Unknown Source)
at java.io.BufferedWriter.<init>(Unknown Source)
at java.io.PrintWriter.<init>(Unknown Source)
at java.io.PrintWriter.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.util.DefaultErrorHandler.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaLoader.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.validation.xs.InsulatedSchemaValidator.<init>(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.validation.xs.SchemaImpl.newXNIValidator(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.validation.XercesSchema._newValidatorHandler(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.validation.XercesSchema.newValidatorHandler(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.JAXPConfiguration.configurePipeline(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
Many thanks for help,
Frank
Edited by: 863908 on Jun 6, 2011 8:09 AM
Edited by: 863908 on Jun 6, 2011 8:11 AM

Badly written code? Look into the Xerces API and you'll find out that I'm using the XML parser the normal way.Not at all. Those APIs deal with any stream. You have gone to a whole lot of extra and unnecessary trouble and expense to read the entire file, probably accumulate it into a StringBuffer, convert that to a String, and create a StringReader around it. Or else you have read the entire file into a char[] array and created a String directly from that. This strategy creates not one but two copies of the entire file in memory, and also wastes time. The normal way is to wrap an InputSource around a FileReader or InputStreamReader, probably with a BufferedReader in between. End of all that pointless and badly written code, end of the two copies of the file in memory, end of the wasting of time, and end of your memory problems too.
Full stop.

"java.lang.OutOfMemoryError: Java heap space" while trying to read Excel.

Hi Experts,
Here is my query. I'm trying to upload excel data into database table. This excel contains more than 20000 records. I'm storing this data in a vector after reading it & passing this vector as a parameter to another method(not mentioned in the below code) which writes into the database. The code works for records <4000, but fails to read beyond that & throws exception as below.
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Java heap space
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:433)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:355)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
javax.servlet.ServletException: Java heap space
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:841)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:774)
     org.apache.jsp.readexcelsap_jsp._jspService(readexcelsap_jsp.java:365)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.OutOfMemoryError: Java heap space
Below is the code for reference. Kindly Help me in getting this heap space error rectified or suggest me alternate ways.
I tried increasing Heap space as googled but in vain.
<%!
private Vector readExcelSheet(String uploadedFilePath, int sheetNo) throws IOException
     Vector allRowInfo = null;
        try
            HSSFSheet sheet= getWorkSheet(uploadedFilePath,sheetNo);
            //System.out.println(uploadedFilePath);
            //System.out.println(sheetNo);
            //System.out.println("--Sheet--"+sheet);
            //System.out.println("--Sheet--"+sheet.getLastRowNum());
            if(sheet!=null)
            allRowInfo = new Vector();
            for(int i=0;i<=sheet.getLastRowNum();i++)
                HSSFRow row= sheet.getRow(i);
                Vector eachRowInfo = new Vector();
                for(short j=0;j<row.getLastCellNum();j++)
                    eachRowInfo.add(getCellContents(row.getCell(j)));
                    //System.out.println("--"+row.getCell(j));
                allRowInfo.add(eachRowInfo);
            else
                 allRowInfo = null;
            //return allRowInfo;
        catch (FileNotFoundException ex)
             System.out.println("-- Error in reading--getWorkSheet -- 1--"+ex);
             allRowInfo = null;
        catch (IOException ex)
             System.out.println("-- Error in reading--getWorkSheet-- 2 --"+ex);
             allRowInfo = null;
        catch (IndexOutOfBoundsException ex)
             System.out.println("-- Error in reading--getWorkSheet-- 2 --"+ex);
             allRowInfo = null;
        catch (NullPointerException ex)
             System.out.println("-- Error in reading--getWorkSheet --"+ex);
             allRowInfo = null;
        catch(Exception e)
            System.out.println(e.getMessage());
            e.printStackTrace();
             allRowInfo = null;
        return allRowInfo;
%>
<%!
private HSSFSheet getWorkSheet(String uploadedFilePath, int sheetNo) throws IOException
        HSSFSheet sheet = null;
        try
            FileInputStream inputStream=new FileInputStream(uploadedFilePath);
            POIFSFileSystem poisFile=new POIFSFileSystem(inputStream);
            HSSFWorkbook workBook= new HSSFWorkbook(poisFile);
            sheet = workBook.getSheetAt(sheetNo);
        catch (FileNotFoundException ex)
             System.out.println("-- Error in reading--getWorkSheet --"+ex);
             sheet = null;
        catch (IOException ex)
             System.out.println("-- Error in reading--getWorkSheet --"+ex);
             sheet = null;
        catch (IndexOutOfBoundsException ex)
             System.out.println("-- Error in reading--getWorkSheet --"+ex);
             sheet = null;
        catch (NullPointerException ex)
             System.out.println("-- Error in reading--getWorkSheet --"+ex);
             sheet = null;
        catch(Exception e)
            System.out.println(e.getMessage());
            e.printStackTrace();
            sheet = null;
         return sheet;
%>
<%!
public String getCellContents(HSSFCell cell)
        String cellValue="";
        String cellValue1="";
        if(cell!=null)
             int cellType= cell.getCellType();
            if(cellType==HSSFCell.CELL_TYPE_NUMERIC)
                cellValue=(float)cell.getNumericCellValue()+"";
            if(cellType==HSSFCell.CELL_TYPE_STRING)
                 cellValue1=cell.getStringCellValue();
                 StringBuffer sb = new StringBuffer();
                 for(int i = 0; i < cellValue1.length(); i++)
                        sb.append(cellValue1.charAt(i));
                     if(cellValue1.charAt(i)=='\'')
                          sb.append('\'');
                 cellValue = sb.toString();
       return cellValue;
%>
<html>
<body>
<%
     String file_Name="Myexcel.xls";
     String path = "D://Test Upload//"+file_Name;
     Vector list = readExcelSheet(path,0);
</html>
</body>Regards
Venky
Edited by: Venky_86 on Jun 17, 2009 6:05 AM

HOW did you increase the heap space? As that is the only solution you have in this case really.
It is a known fact that POI can use up a lot of memory for big spreadsheets. If at all possible, I would try to switch to plain text comma separated files / tab delimited files. If you cannot do that, I would try to put a size restriction on the sheets that your application will process to get rid of the heap space risk. A sheet can contain 20000 records, or four sheets can contain 5000 records; in both cases you process the exact same data, but at only 25% of the total memory usage.

One app service getting "java.lang.OutOfMemoryError: Java heap space"

We are running a commercial app on WebLogic 9.2. Two physical servers with 5 application processes running on each in a single cluster. on the server in question, we have 5.5 gigs of free ram at the moment and still getting the message below.
We have 10 app servers and one is getting this message. the full text of it is:
####<Apr 13, 2011 10:58:12 AM CDT> <Warning> <DeploymentService> <lxwbwapa> <workbpr2_node_1a> <[ACTIVE] ExecuteThread: '6' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1302710292663> <BEA-290064> <Deployment service servlet encountered an Exception while handling the deployment service message for request id "-1" from server "Admin_pr2_a". Exception is: "java.lang.OutOfMemoryError: Java heap space
".>
I dug back through the logs and found it started a couple of weeks ago. I have been able to log into this app server without issue.
Something else I have noticed is that the total heap size for all the app services have shrunk from the initial value of 1.5G - they have all dropped down into the 500 meg range. Is this normal? Why has this one not increased the size of the heap if it is running out of memory?
I could restart the service for this app server but I would not know the cause and since it is a production server where I am not recieving complaints, I am hesitant to go through the res tape to do a re-start.
Any information or past experience with this type issue is greatly appreciated.
Thanks,
W

Hello,
You might want to post this in the weblogic forum: WebLogic Server - General
as they might be able to explain how WebLogic uses or releases resources.
Regards,
Chris

OutOfMemoryError: Java heap space, with lots of heap space left

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