Hands-On High Performance with Spring 5

Common reasons for memory leaks

The following are the most common reasons for memory leaks:

• Open streams: While working on streams and readers, we often forget to close the streams, which eventually results in the memory leak. There are two types of leaks that result from unclosed streams—low-level resource leak and memory leak. Low-level resource leak includes OS-level resources, such as file descriptor and open connection. As JVM consumes memory to track these resources, it leads to memory leak. To avoid leaks, use the finally block to close the stream or use the autoclose feature of Java 8.
• Open connections: We often forget to close opened HTTP, database, or FTP connections, which results in the memory leak. Similar to closing streams, ...