I'm unable to open a heap dump using the standalone eclipse memory analyzer, or visualVM. I've tried two different hprof files. VisualVM just hangs at loading heap dump, and eclipse memory analyzer gives me the below error.

```
Error opening heap dump 'java_pid15751.hprof'. Check the error log for further details.
Error opening heap dump 'java_pid15751.hprof'. Check the error log for further     details.
Not a HPROF heap dump (java.io.IOException)
Not a HPROF heap dump

```

I'm using windows 7 32 bit. The application server is on jboss 7.1.1 with the java version below.
OpenJDK Runtime Environment (IcedTea6 1.10.6) (rhel-1.43.1.10.6.el6\_2-x86\_64)
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)