Java heap space

Java heap space is a part of a computer's memory where Java objects are stored. As Java is an object-oriented programming language, all data is stored in the form of objects, which are dynamically allocated on the heap. The heap space is used to store these objects, and the size of the heap can be configured when the JVM (Java Virtual Machine) is started. The default size of the heap varies depending on the JVM implementation, but it is usually around 256MB to 512MB. If the heap space is not large enough to store all the objects created by a Java program, the JVM will throw a java.lang.OutOfMemoryError, which indicates that the heap space is exhausted. To avoid this error, you can increase the heap size using JVM arguments or optimize your Java code to reduce memory usage.