Java and Eclipse Plugin Development: UseCompressedOops flag with java
Compressed oops is supported and enabled by default in Java SE 6u23 and later. In Java SE 7, use of compressed oops is the default for 64-bit JVM processes when -Xmx isn't specified and for values of -Xmx less than 32 gigabytes. For JDK 6 before the 6u23 release, use the -XX:+UseCompressedOops flag with the java command to enable the feature.
In summary:
Java version <6u23 - use command to set it.
Java version >=6u23 - by default enabled.
JDK7 - if -xmx not specified or -xmx <32GB => configured bydefault
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