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Explore IBM Java 7

34 points by javinpaul 14y ago

fiatmoney 14y ago
My impression is that aside from platform support, the major difference between the Oracle and IBM JVMs is their garbage collector. Is there someplace that has a definitive comparison (as opposed to just a rough description of each one's techniques)?
mtgx 14y ago
I'm not familiar with this. Did IBM fork Java when Oracle bought Sun? If so why isn't Oracle going after IBM for "losing them billions of dollars", like when they went after Google?
- cluda01 14y ago
  HP also has their own implementation I believe
- jpeterson 14y ago
  No, the IBM JVM has been around for ages.
- jebblue 14y ago
  I think IBM has licensed Java for years and built their version in compliance with that license.
- Spooky23 14y ago
  IBM licensed it so they could optimize Java for Z, i-Series (aka AS/400), p-Series (AIX) and WebSphere. A decade ago, it performed much better than Sun Java in many respects. There used to be licensing restrictions as well -- I think on x86 it was theoretically only free to run on IBM hardware or with other IBM software (ie. WebSphere, DB2, Tivoli, etc).
- rabbitfang 14y ago
  "Did IBM fork Java when Oracle bought Sun? If so why isn't Oracle going after IBM" IBM has had their own JDK implementation for more than 15 years. April 6th 1997 is about as close a date as I can find: http://www.os2ezine.com/v2n7/javarev.htm http://www.os2ezine.com/v2n7/javarev.htm (that's version 1.0.2, so it's probably even earlier). IBM have a license and produced a fully compatible implementation. Before Oracle bought BEA (who bought JRockit) there was also another independent commercial JDK implementation in addition to the IBM and Sun/Oracle ones.
- nessus42 14y ago
  If so why isn't Oracle going after IBM for "losing them billions of dollars", like when they went after Google? It's my understanding that Sun had a number of patents specifically for using Java on mobile devices that don't apply to non-mobile devices.
skorgu 14y ago
IBM also has a realtime jvm, metronome (aka "websphere realtime"): http://www.youtube.com/watch?v=jid4WaILPBk http://www.youtube.com/watch?v=jid4WaILPBk
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34 points by javinpaul 14y ago

My impression is that aside from platform support, the major difference between the Oracle and IBM JVMs is their garbage collector. Is there someplace that has a definitive comparison (as opposed to just a rough description of each one's techniques)?

mtgx 14y ago

I'm not familiar with this. Did IBM fork Java when Oracle bought Sun? If so why isn't Oracle going after IBM for "losing them billions of dollars", like when they went after Google?

cluda01 14y ago
HP also has their own implementation I believe
jpeterson 14y ago
No, the IBM JVM has been around for ages.
jebblue 14y ago
I think IBM has licensed Java for years and built their version in compliance with that license.
Spooky23 14y ago
IBM licensed it so they could optimize Java for Z, i-Series (aka AS/400), p-Series (AIX) and WebSphere. A decade ago, it performed much better than Sun Java in many respects. There used to be licensing restrictions as well -- I think on x86 it was theoretically only free to run on IBM hardware or with other IBM software (ie. WebSphere, DB2, Tivoli, etc).
rabbitfang 14y ago
"Did IBM fork Java when Oracle bought Sun? If so why isn't Oracle going after IBM" IBM has had their own JDK implementation for more than 15 years. April 6th 1997 is about as close a date as I can find: http://www.os2ezine.com/v2n7/javarev.htm http://www.os2ezine.com/v2n7/javarev.htm (that's version 1.0.2, so it's probably even earlier). IBM have a license and produced a fully compatible implementation. Before Oracle bought BEA (who bought JRockit) there was also another independent commercial JDK implementation in addition to the IBM and Sun/Oracle ones.
nessus42 14y ago
If so why isn't Oracle going after IBM for "losing them billions of dollars", like when they went after Google? It's my understanding that Sun had a number of patents specifically for using Java on mobile devices that don't apply to non-mobile devices.

skorgu 14y ago

IBM also has a realtime jvm, metronome (aka "websphere realtime"): http://www.youtube.com/watch?v=jid4WaILPBk http://www.youtube.com/watch?v=jid4WaILPBk

deleted 14y ago

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