jhat(1) Troubleshooting Tools jhat(1) (NAME) jhat - . (SYNOPSIS) jhat [ options ] heap-dump-file options . . heap-dump-file . # : myfile.hprof#3. (DESCRIPTION) jhat . jhat . jhat MyClass Object Query Language (OQL) . OQL SQL . OQL OQL jhat . OQL http://localhost:7000/oqlhelp . : o jmap -dump . jmap(1) . o jconsole HotSpotDiagnosticMXBean . jconsole(1) HotSpotDiagnosticMXBean http://docs.oracle.com/javase/8/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticMXBean.html . o OutOfMemoryError -XX:+HeapDumpOnOutOfMemoryError (JVM). o hprof. HPROF: A Heap/CPU Profiling Tool http://docs.oracle.com/javase/8/docs/technotes/samples/hprof.html . (OPTIONS) -stack false|true . false . true . -refs false|true . true . ( ) . -port port-number HTTP jhat . 7000 . -exclude exclude-file . java.lang.String.value o java.lang.String.value . -baseline exclude-file (baseline) . . . . -debug int . 0 . . -version . -h . -help . -Jflag flag jhat . -J-Xmx512m . (SEE ALSO) o jmap(1) o jconsole(1) o HPROF: A Heap/CPU Profiling Tool http://docs.oracle.com/javase/8/docs/technotes/samples/hprof.html JDK 8 21 November 2013 jhat(1)