How to Detect Memory Leaks in Java: Causes, Types, & Tools

A memory leak in Java occurs when an application unintentionally retains references to objects no longer needed, preventing the garbage collector from freeing up memory and potentially causing system performance degradation or an 'OutOfMemoryError'. Common causes include excessive session objects, unbounded caches, and improper use of static fields or unclosed resources. The improper implementation of methods like equals() and hashCode() can also lead to memory leaks, especially when working with collections like HashSet and HashMap. Detecting memory leaks involves using tools like memory profilers, enabling verbose garbage collection, and analyzing heap dumps. Effective management of Java errors can be achieved with tools like Rollbar, which automates error monitoring and triaging, thus easing the process of fixing errors.