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