Java virtual machine: Difference between revisions

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| bits = [[32-bit computing|32-bit]]

| introduced = 1994

| version = {{wikidata|property|preferred|references|edit|Q251|P348|P548=Q2804309}}

| version = 20.0.1<ref name="latest-stable-JDK20">{{cite web|author=yan|date=2023-06-24|url=https://www.oracle.com/java/technologies/javase/20u-relnotes.html|title=JDK 20 Release Notes |website=[[Oracle Corporation]]|access-date=2023-06-24|archive-date=2021-07-09|archive-url=https://web.archive.org/web/20210709182235/https://hg.openjdk.java.net/jdk-updates/jdk15u/rev/1055f2102e6e|url-status=live}}</ref>

| design =

| type = [[Stack machine|Stack]] and [[Load–store architecture|register–register]]

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{{Blockquote|[[Sun Microsystems|We]] intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Oracle provides tests that verify the proper operation of implementations of the Java Virtual Machine.}}

The most commonly used Java virtual machine is Oracle's [[HotSpot (virtual machine)|HotSpot]].

One of Oracle's JVMs is named HotSpot; the other, inherited from [[BEA Systems]], is [[JRockit]]. Oracle owns the Java trademark and may allow its use to certify implementation suites as fully compatible with Oracle's specification.

One of Oracle's JVMs is named HotSpot; the other, inherited from [[BEA Systems]], is [[JRockit]]. Oracle owns the Java trademark and may allow its use to certify implementation suites as fully compatible with Oracle's specification.

===Garbage collectors===

{{main|Garbage collection (computer science)#Java}}

{| class="wikitable"

|+ Java versions and their Garbage Collectors

|-

! Version !! Default GC !! Available GCs

|-

| 6u14 || rowspan="2" | Serial /<br />Parallel ([[Multiprocessor system architecture|MP]]) || Serial, Parallel, [[Concurrent mark sweep collector|CMS]], ''[[Garbage-first collector|G1]] (E)''

|-

| 7u4 - 8 || rowspan="2" | Serial, Parallel, CMS, G1

|-

| 9 - 10 || rowspan="9" | G1

|-

| 11 || Serial, Parallel, CMS, G1, ''Epsilon (E)'', ''ZGC (E)''

|-

| 12 - 13 || Serial, Parallel, CMS, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''

|-

| 14 || Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''

|-

| 15 - 20 || Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah

|-

| 21 - 22 || Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, ''GenZGC (E)''

|-

| 23 || Serial, Parallel, G1, ''Epsilon (E)'', ZGC, Shenandoah, GenZGC (default ZGC)

|-

| 24 || Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShen (E)''

|-

| 25 || Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, GenShen

|-

| colspan="3" | <small> ''(E)'' = ''experimental''</small>

|}

===Class loader===