The best replacement for sun jdk is openjdk.

The best alternatives to sun jdk are rated as following:
★★★★★  openjdk
★★★★  ibm jdk
★★  jrockit

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Speaking about sun jdk, one probably shouldn't forget about websphere.

Other search terms related to sun jdk and their ratings are:
★★★★★ websphere
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Google Trends

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sun jdk
openjdk
ibm jdk