➟ Purpose
The main purpose of this article is to understand the root cause behind different kind of error messages we generally face while our day to day coding life. Here, I am going to clear some important and most seen error messages.
➟ Class Hierarchy for Error
➟ Some Examples
➤ java.lang.OutOfMemoryError: GC Overhead limit exceeded
• It does not indicate that heap space memory is 100% full, but it's very small.
• If more than 98% of the total time is spent in garbage collection and less than 2% of the heap is recovered, then this kind of error is thrown.
• This feature is designed to prevent applications from running for an extended period of time while making little or no progress because the heap is too small.
• It can be disable using
➤ java.lang.OutOfMemoryError: Requested array size exceeds VM limit
• The application (or APIs used by that application) attempted to allocate an array that is larger than the heap size.
• For example, if an application attempts to allocate an array of 512 MB but the maximum heap size is 256 MB.
➤ java.lang.OutOfMemoryError: Java heap space
• Heap space memory is 100% full or it is less than required for allocating to new object.
• This error does not necessarily always imply a memory leak, but it can be.
• The problem can be as simple as a configuration issue, where the specified heap size (or the default size, if it is not specified) is insufficient for the application.
➤ java.lang.OutOfMemoryError: PermGen space
• It indicates the perm gen memory (subpart of heap) is full.
• It indicates it's not able to store more class or method metadata.
• It will be no more thrown while using JDK 8.
➤ java.lang.OutOfMemoryError: Metaspace
• It indicates the native memory (referred to here as metaspace) is full.
• It indicates it's not able to store more class or method metadata.
• It can be thrown while using JDK 8.
➤ java.lang.StackOverflowError
• It indicates the perm gen memory (subpart of heap) is full.
• It indicates it's not able to store more class or method metadata.
The main purpose of this article is to understand the root cause behind different kind of error messages we generally face while our day to day coding life. Here, I am going to clear some important and most seen error messages.
➟ Class Hierarchy for Error
➤ java.lang.OutOfMemoryError: GC Overhead limit exceeded
• It does not indicate that heap space memory is 100% full, but it's very small.
• If more than 98% of the total time is spent in garbage collection and less than 2% of the heap is recovered, then this kind of error is thrown.
• This feature is designed to prevent applications from running for an extended period of time while making little or no progress because the heap is too small.
• It can be disable using
-XX:-UseGCOverheadLimit ➤ java.lang.OutOfMemoryError: Requested array size exceeds VM limit
• The application (or APIs used by that application) attempted to allocate an array that is larger than the heap size.
• For example, if an application attempts to allocate an array of 512 MB but the maximum heap size is 256 MB.
➤ java.lang.OutOfMemoryError: Java heap space
• Heap space memory is 100% full or it is less than required for allocating to new object.
• This error does not necessarily always imply a memory leak, but it can be.
• The problem can be as simple as a configuration issue, where the specified heap size (or the default size, if it is not specified) is insufficient for the application.
➤ java.lang.OutOfMemoryError: PermGen space
• It indicates the perm gen memory (subpart of heap) is full.
• It indicates it's not able to store more class or method metadata.
• It will be no more thrown while using JDK 8.
➤ java.lang.OutOfMemoryError: Metaspace
• It indicates the native memory (referred to here as metaspace) is full.
• It indicates it's not able to store more class or method metadata.
• It can be thrown while using JDK 8.
➤ java.lang.StackOverflowError
• It indicates the perm gen memory (subpart of heap) is full.
• It indicates it's not able to store more class or method metadata.
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