1 The jhat tool has been removed. jhat hprof file parser/validator
   2 are needed for tests. The old packages for jhat were moved here:
   3 com.sun.tools.hat.internal.model -> jdk.test.lib.hprof.model
   4 com.sun.tools.hat.internal.parser -> jdk.test.lib.hprof.parser
   5 com.sun.tools.hat.internal.util -> jdk.test.lib.hprof.util
   6  
   7 jhat was added in JDK 6 and its original implementation was from 
   8 java.net HAT project [1]. jhat is an experimental, unsupported tool. 
   9 There hasn't been much update to jhat tool in the JDK. In addition, 
  10 there are several better heap dump visualizer/analyzer emerged since 
  11 JDK 5/6 serviceability support.
  12 
  13 [1] https://java.net/projects/hat