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