jhat requires heap dumps in binary format. This is documented in the troubleshooting guide and on the man page. If a user tries to run jhat on an ASCII format file, they will see: % jhat java.hprof.txt Reading from java.hprof.txt... java.io.IOException: Version string not recognized at byte 18 at com.sun.tools.hat.internal.parser.HprofReader.readVersionHeader(HprofReader.java:369) at com.sun.tools.hat.internal.parser.HprofReader.read(HprofReader.java:161) at com.sun.tools.hat.internal.parser.Reader.readFile(Reader.java:79) at com.sun.tools.hat.Main.main(Main.java:143) jhat should print a user-understandable message. Maybe something like: This is an ASCII format JAVA PROFILE 1.0.1 file. jhat requires binary format heap dump files.
|