JRockit JVM vs HotSpot JVM

Question

If anyone can give me a summary of the advantages and disadvantages of the two JVMs, as they all depend on the standard JVM specification.

Answer 1

JRockit was originally developed by Appeal and BEA Systems before acquiring Oracle to run server software. ¹ It was supposed to be optimized for large applications requiring lengthy tasks, a large amount of memory and a scalable environment, promoting optimization for these scenarios even further than Sun HotSpot JVM in server mode (see also: Real differences between the "java server" and "java -client", ).

Ever since Sun Microsystems acquired Oracle Oracle has announced

In fact, as mentioned in the same blog,; and some of the JRockit functions are gradually being added to HotSpot ().

Read more:

^{1 As partially pulled out of March 3, 2012 at 1.50PM EST.}

Answer 2

There is no JRockit version for java 7. The loaded JDK for Java 7 and Java 8 is Java HotSpot. I can confirm this to download Java 7 and Java 8 jdk for oracle. Link for Java 7

Here is the version confirmation for java -version for JDK 1.7
Java (TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot (TM) 64-bit server VM (build 24.80-b11, mixed mode)

JRockit and HotSpot were merged, and JDK 7 contains the first release of this converged JVM (see Henrik's Java 7 blog)

Answer 3

JRockit used to be considered the best, although I'm not sure that this has always been proven sequentially. Oracle is currently integrating JRockit and HotSpot.