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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.▼
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===Garbage collectors===
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! 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)''
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| 7u4 - 8 || rowspan="2" | Serial, Parallel,
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| 9 - 10 || rowspan="
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| 11 || Serial, Parallel,
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| 12 - 13 || Serial, Parallel,
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| 14 || Serial, Parallel, G1, ''Epsilon (E)'', ''ZGC (E)'', ''Shenandoah (E)''
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| 24 || Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, ''GenShen (E)''
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| 25 || Serial, Parallel, G1, ''Epsilon (E)'', Shenandoah, GenZGC, GenShen
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| colspan="3" | <small> ''(E)'' = ''experimental''</small>
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