Increasing Heap Space in Eclipse: (Java.Lang.Outofmemoryerror)

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

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

Eclipse Exception with java.lang.OutOfMemoryError: Java heap space

You are asking for space for about 750MB, but your program starts with a maximum allowed of 256,

Take a look at this

Just add -Xmx2048M (for 2048 MB, you can change that number) in the list of VM arguments in the corresponding run configuration.

java.lang.OutOfMemoryError: Java heap space in Eclipse, regardless of the settings

The eclipse.ini settings are only used for the Eclipse application.

When you Run a Java application from Eclipse you need to go to 'Run > Run Configurations'. Find your application in the Java application list. On the 'Arguments' tab enter your memory settings in the 'VM arguments' section.

How to deal with java.lang.OutOfMemoryError: Java heap space error?

Ultimately you always have a finite max of heap to use no matter what platform you are running on. In Windows 32 bit this is around 2GB (not specifically heap but total amount of memory per process). It just happens that Java chooses to make the default smaller (presumably so that the programmer can't create programs that have runaway memory allocation without running into this problem and having to examine exactly what they are doing).

So this given there are several approaches you could take to either determine what amount of memory you need or to reduce the amount of memory you are using. One common mistake with garbage collected languages such as Java or C# is to keep around references to objects that you no longer are using, or allocating many objects when you could reuse them instead. As long as objects have a reference to them they will continue to use heap space as the garbage collector will not delete them.

In this case you can use a Java memory profiler to determine what methods in your program are allocating large number of objects and then determine if there is a way to make sure they are no longer referenced, or to not allocate them in the first place. One option which I have used in the past is "JMP" http://www.khelekore.org/jmp/.

If you determine that you are allocating these objects for a reason and you need to keep around references (depending on what you are doing this might be the case), you will just need to increase the max heap size when you start the program. However, once you do the memory profiling and understand how your objects are getting allocated you should have a better idea about how much memory you need.

In general if you can't guarantee that your program will run in some finite amount of memory (perhaps depending on input size) you will always run into this problem. Only after exhausting all of this will you need to look into caching objects out to disk etc. At this point you should have a very good reason to say "I need Xgb of memory" for something and you can't work around it by improving your algorithms or memory allocation patterns. Generally this will only usually be the case for algorithms operating on large datasets (like a database or some scientific analysis program) and then techniques like caching and memory mapped IO become useful.

How to increase application heap size in Eclipse?

In the run configuration you want to customize (just click on it) open the tab Arguments and add -Xmx2048min the VM arguments section.
You might want to set the -Xms as well (small heap size).

eclipse java 1.8 java.lang.outofmemoryerror: java heap space

I fixed the problem that I try to removed the related source that causing this problem and got another error message:
java.lang.StackOverflowError at org.eclipse.jdt.internal.compiler.lookup.ParameterizedTypeBinding.mentionsAny(ParameterizedTypeBinding.java:915)

Than I got the answer from below question:
Eclipse Luna StackOverflow exception at Build Time

The problem is the eclipse Luna version 4.4.0 or below compiled with Java 1.8 may cause this problem. But the problem should be fixed in Luna 4.4.1.

I change to use oxygen 3 RC3(v4.7) and it is fine.

Exception in thread main java.lang.OutOfMemoryError: Java heap space in eclipse

in your java file you have to use double[] array. I think you are not declaring the proper size for the array

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