There are 2 different behaviors:
x86 and x64:
java -XX:+UseAES -XX:UseSSE=2 -XX:+PrintFlagsFinal -version| grep UseAES
     bool UseAES := true {product}
     bool UseAESIntrinsics = false {product}
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b69)

Intrinsics usage is supported only if SSE version is >2 and UseAES flag is true

sparc:
java -XX:UseVIS=0 -XX:+UseAES -XX:+PrintFlagsFinal -version | grep UseAES
Java HotSpot(TM) 64-Bit Server VM warning: SPARC AES intrinsics require VIS3 instruction support. Intrinsics will be disabled.
     bool UseAES := false {product}
     bool UseAESIntrinsics = false {product}
java version "1.9.0-ea"
Java(TM) SE Runtime Environment (build 1.9.0-ea-b69)
Intrinsics usage is supported only if VIS version is >2 but useAES flag is false without clear reason

Some code from cpu/sparc/vm/vm_version_sparc.cpp:
 if (has_aes()) {
    if (UseVIS > 2) { // AES intrinsics use MOVxTOd/MOVdTOx which are VIS3
      if (FLAG_IS_DEFAULT(UseAES)) {
        FLAG_SET_DEFAULT(UseAES, true);
      }
      if (FLAG_IS_DEFAULT(UseAESIntrinsics)) {
        FLAG_SET_DEFAULT(UseAESIntrinsics, true);
      }
      // we disable both the AES flags if either of them is disabled on the command line
      if (!UseAES || !UseAESIntrinsics) {
        FLAG_SET_DEFAULT(UseAES, false);
        FLAG_SET_DEFAULT(UseAESIntrinsics, false);
      }
    } else {
        if (UseAES || UseAESIntrinsics) {
          warning("SPARC AES intrinsics require VIS3 instruction support. Intrinsics will be disabled.");
          if (UseAES) {
            FLAG_SET_DEFAULT(UseAES, false);
          }
          if (UseAESIntrinsics) {
            FLAG_SET_DEFAULT(UseAESIntrinsics, false);
          }
        }
    }
Else block here must be reworked to disable useAESIntrinsics, not useAES