How To Increase PermGenSpace Of Eclipse ?

If you see java.lang.OutOfMemoryError: PermGen space errors, you need to increase the permanent generation space available to Eclipse.
PermGen is the permanent generation of objects in the VM (Class names, internalized strings, objects that will never get garbage-collected). An easy, if somewhat memory-hungry fix is to enlarge the maximum space for these objects by adding,

“-XX:MaxPermSize=128M”

as an argument to the JVM when starting Eclipse. The recommended way to do this is via your eclipse.ini file.
Alternatively, you can invoke the Eclipse executable with command-line arguments directly, as in

“eclipse [normal arguments] -vmargs -XX:PermSize=64M -XX:MaxPermSize=128M [more VM args]”

Note: The arguments after -vmargs are directly passed to the VM. Run java -X for the list of options your VM accepts. Options starting with -X are implementation-specific and may not be applicable to all JVMs (although they do work with the Sun/Oracle JVMs).

Eclipse and Sun VMs on Windows


Eclipse 3.3 and above supports an argument to the launcher: --launcher.XXMaxPermSize. On Windows, Eclipse ships with the following lines in the eclipse.ini file:
    
          “--launcher.XXMaxPermSize=256m”

With the above arguments, if the VM being used is a Sun VM and there is not already a -XX:MaxPermSize= VM argument, then the launcher will automatically add -XX:MaxPermSize=256m to the list of VM arguments being used. The Eclipse launcher is only capable of identifying Sun VMs on Windows.
The option --launcher.XXMaxPermSize is something that the launcher reads (not the JVM); it tells the launcher to automatically size the JVM's perm gen if it (the launcher) detects a Sun JVM that supports that option. This alleviates the need to put it under -vmargs (where non-Sun JVM's could fail because they don't understand that option).

Note: Eclipse 3.6 and below on Windows has a bug with Oracle/Sun JDK 1.6.0_21 (July 2010) where the launcher cannot detect an Oracle/Sun VM, and therefore does not use the correct PermGen size. If you are using either of this version, add the -XX flag to the eclipse.ini as described above.

Note: Eclipse 3.3.1 has a bug where the launcher cannot detect a Sun VM, and therefore does not use the correct PermGen size. It seems this may have been a known bug on Mac OS X for 3.3.0 as well. If you are using either of these platform combinations, add the -XX flag to the eclipse.ini as described above.

Popular posts from this blog

Resolve OutOfMemoryError With ExcelExport : Export Excel Utility with Apache POI Stream API (SXSSF)

                                 Whenever we try to export excel of huge data (for ex: around 200000-300000 records), most of the time we end up with OutOfMemoryError:JavaHeapSpace. And also consuming more time to process or export that much of data. Main reason to this kind of problem is that, the prior version of Apache POI (prior to 3.8) will not provide proper solution for this kind of situations and also we have other issues with the API designed with those versions. Even I had faced issues of not supporting more than 65000 rows of data during exporting excel with prior versions of POI. But with the version 3.8 and higher they come with solutions for all these problems. To resolve Memory issue and performance issue of Excel Export they have utilized stream API to design their API to support huge data export and performance issues. With stream API we can flush only few rows of data into the Memory and reamining we can flush to the hard memory (permanent Memory). In this examp
Read more

How To Resolve "Java compiler level does not match the version of the installed Java project facet." Issue in Eclipse, STS tool or Eclipse Based Tools

Image
                  I have faced this issue during the Java 7 upgrade from Java 6 into one of our application. You will face this issue suppose if your application or project built on lower versions of Java (in my case it is Java 1.6) and you are trying to upgrade it to the Higher versions of Java (in My case it is Java 1.7), then Eclipse will throw this error in the tool. You will face this error even after changing the compiler version from build path. To fix this issue Follow the Below Mentioned Steps. 1.  Open the ' Markers ' Tab at the bottom of the eclipse or STS tool beside the ' Properties ' Tab. (as shown in the below figure) 2. Right Click on the Error as mentioned in the below figure. in The context menu click on the ' Quick Fix ' item as shown below in the figure. 3. Select the correct Java Project Facet from the ' Quick Fix ' Window. and click on the ' Finish ' Button. 4.  After Clicking on '
Read more

Some Important Facts About Core Java

There are 4 important OOPS concepts in Java : Inheritance, Abstraction, Encapsulation and Polymorphism. There are two types of variables in Java : Primitive types and Object Types The default value of Boolean is false (the same applies for the Wrapper class too). Marker interface is the one which doesn't contains any methods , it is like empty interface. You cannot override the 'main' method of the Java, even-though if you try to do so it will not give any exception, program compiles and executes fine. The reason is : 'main' method is of type static . Static methods are class level methods. Even-though it looks like method overriding, it is not overriding. These are two different method with respect to the corresponding class. You can Overload the 'main' method of Java, it is valid in Java. You can have only one 'Public' class and any number of non-public classes in any java source file. Inheritance is an example for IS-A relationship. C
Read more