Increasing heap space in Eclipse java lang OutOfMemoryError

Question

try          CompareRecord record   new CompareRecord        Connection conn   new CompareRecord   getConection  eliteddaprd   eliteddaprd   192 168 14 104   1521        ResultSet res   null       if  conn    null           Statement stmt   conn createStatement            res   stmt executeQuery  select rowindx ADDRLINE1 from dedupinitial order by rowindx               Map lt Integer String gt  adddressMap   new LinkedHashMap lt Integer  String gt         if  res    null           System out println  result set is not null             while res next                 adddressMap put res getInt 1  res getString 2                         System out println  address Map size           gt    adddressMap size         Iterator it   adddressMap entrySet   iterator        int count   0      int min   0       while  it hasNext             Map Entry pairs    Map Entry it next            Pattern p   Pattern compile      s              Integer outerkey    Integer pairs getKey            String outerValue    String pairs getValue              System out println  outer Value        gt    outerValue            String   outerresult   p split outerValue           Map Entry pairs2   null          count            List lt Integer gt  dupList   new ArrayList lt Integer gt              Iterator innerit   adddressMap entrySet   iterator            boolean first   true           while  innerit hasNext                   System out println  count value     gt    count               int totmatch   0              if first                   if count    adddressMap size                         break                                    for int i 0 i lt  count i                         pairs2    Map Entry innerit next                                      first    false                            else                  pairs2    Map Entry innerit next                              Integer innterKey    Integer pairs2 getKey                String innerValue    String pairs2 getValue                  System out println  innrer value   innerValue               String   innerresult   p split innerValue                for int j 0 j lt outerresult length j                     for int k 0 k lt innerresult length k                         if outerresult j  equalsIgnoreCase innerresult k                               System out println outerresult j    Match With   innerresult k                            totmatch                            break                                                                     min   Math min outerresult length  innerresult length               if min    0  amp  amp    totmatch 100  min   gt  50                      System out println  maching inner key           gt    innterKey                   dupList add innterKey                                     System out println  Duplilcate List Sisze                     gt    dupList size         outerkey              System out println  End            gt    new Date       catch  Exception e        e printStackTrace        Here ResultSet have processed around 500000 records  but it will give me error like   Exception in thread  main  java lang OutOfMemoryError  Java heap space     at java util HashMap resize HashMap java 508      at java util LinkedHashMap addEntry LinkedHashMap java 406      at java util HashMap put HashMap java 431      at spite CompareRecord main CompareRecord java 91    I know this error comes because of VM memory  but don t know how to increase it in Eclipse   What do I do if I have to process even more than 500 000 records

User · Answer

I am not pro in Java but your problem can be solved by "blockingqueue" if you use it wisely.

Try to retrieve a chunk of records first, process them, and iterate the process until you complete your processing. This may help you to get rid of the OutOfMemory Exceptions.

User · Answer

What to do if i have to processed even more that 500000 records     There are a few ways  to increase the java heap size for your app where a few have suggested already  Your app need to remove the elements from your adddressMap as your app add new element into it and so you won t encounter oom if there are more records coming in  Look for producer-consumer if you are interested

User · Answer

Sometimes the exception will not stop after you increase the memory in eclipse ini file  then try below option  Go to Window    Preferences    MyEclipse    Java Enterprise Project    Web Project    Deployment Tab Under -  Under Library Deployment Policies  UnCheck -  Jars from User Libraries

User · Answer

To increase the Heap size in eclipse change the eclipse ini file   refer to   http   wiki eclipse org FAQ How do I increase the heap size available to Eclipse 3F

User · Answer

In Eclipse goto Run- Run Configuration find the Name of the class you have been running  select it  click the Target tab then in  Additional Emulator Command Line Options  add   -Xms512M -Xmx1524M  then click apply

User · Answer

In Run- Run Configuration find the Name of the class you have been running  select it  click the Arguments tab then add   -Xms512M -Xmx1524M  to the VM Arguments section

User · Answer

In the Eclipse download folder make the entries in the eclipse ini file    --launcher XXMaxPermSize 512M -vmargs -Dosgi requiredJavaVersion 1 5 -Xms512m -Xmx1024m   or what ever values you want

User · Answer

Go to  Window -  Preferences -  General -  C C   -  Code analysis  and disable  Syntax and Semantics Errors -  Abstract class cannot be instantiated

User · Answer

You can increase the size of the memory through the use of commandline arguments    See this link   eclipse -vmargs -Xmx1024m  Edit  Also see see this excellent question

User · Answer

Please make sure your code is fine  I too got stuck in this problem once and tried the solution accepted here but in vain  So I wrote my code again  Apparently I was using a custom array list and adding the values from an array  I tried changing the ArrayList to accept the primitive values only and it worked

User · Answer

In eclipse ini file  make below entries  -Xms512m  -Xmx2048m  -XX MaxPermSize 1024m

User · Answer

See http   blog headius com 2009 01 my-favorite-hotspot-jvm-flags html  -Xms and -Xmx set the minimum and maximum sizes for the heap  Touted as a feature  Hotspot puts a cap on heap size to prevent it from blowing out your system  So once you figure out the max memory your app needs  you cap it to keep rogue code from impacting other apps  Use these flags like -Xmx512M  where the M stands for MB  If you don t include it  you re specifying bytes  Several flags use this format  You can also get a minor startup perf boost by setting minimum higher  since it doesn t have to grow the heap right away   -XX MaxPermSize    M sets the maximum  permanent generation  size  Hotspot is unusual in that several types of data get stored in the  permanent generation   a separate area of the heap that is only rarely  or never  garbage-collected  The list of perm-gen hosted data is a little fuzzy  but it generally contains things like class metadata  bytecode  interned strings  and so on  and this certainly varies across Hotspot versions   Because this generation is rarely or never collected  you may need to increase its size  or turn on perm-gen sweeping with a couple other flags   In JRuby especially we generate a lot of adapter bytecode  which usually demands more perm gen space

User · Answer

You may want to close open projects in your Project Explorer  You can do this by right-clicking an open project  and selecting  Close Project     This is what worked for me after I noticed that I had to periodically increase the heap size in my directory eclipse eclipse ini   Hope this helps  Peace

User · Answer

The accepted solution of modifying a Run Configuration wasn t ideal for me as I have a few different run configurations and could easily forget to do this when adding further ones in future  Also I wanted the setting to apply whenever running anything  e g  when running JUnit tests by right-clicking and selecting  Run As  -   JUnit Test    The above can be achieved by modifying the JRE JDK settings instead -   Go to Window -  Preferences  Select Java -  Installed JREs Select your default JRE  which could be a JDK  and click on  Edit     Change the  Default VM arguments  value as required  e g  -Xms512m -Xmx4G -XX MaxPermSize 256M

User · Answer

How to give your program more memory when running from Eclipse  Go to Run   Run Configurations  Select the run configuration for your program  Click on the tab  Arguments   In the  Program arguments  area  add a -Xmx argument  for example -Xmx2048m to give your program a max  of 2048 MB  2 GB  memory   How to prevent this memory problem  Re-write your program in such a way that it does not need to store so much data in memory  I haven t looked at your code in detail  but it looks like you re storing a lot of data in a HashMap  more than fits in memory when you have a lot of records

[java] Increasing heap space in Eclipse: (java.lang.OutOfMemoryError)

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