Jaroslav Tulach created NETBEANS-4618:
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Summary: HeapFactory cannot process multi heap segment files
Key: NETBEANS-4618
URL: https://issues.apache.org/jira/browse/NETBEANS-4618
Project: NetBeans
Issue Type: Bug
Components: profiler - Base
Affects Versions: 12.0, 12.0.1
Reporter: Jaroslav Tulach
Attachments: multiheapsegment.hprof, singleheapsegment.hprof
I am trying to generate {{.hprof}} file according to the [Java Profile
1.0.2|http://hg.openjdk.java.net/jdk6/jdk6/jdk/raw-file/tip/src/share/demo/jvmti/hprof/manual.html#mozTocId848088]
specification. I believe I am fully following the specification (which allows
multiple heap segments), but NetBeans Profiler library chokes up on my file and
yields following exception:
{code:java}
java.lang.IllegalArgumentException: Invalid dump tag 0 at position 1415
at
org.netbeans.lib.profiler.heap.HprofHeap.readDumpTag(HprofHeap.java:1138)
at
org.netbeans.lib.profiler.heap.HprofHeap.fillHeapTagBounds(HprofHeap.java:1215)
at org.netbeans.lib.profiler.heap.HprofHeap.<init>(HprofHeap.java:140)
at
org.netbeans.lib.profiler.heap.HeapFactory.createHeap(HeapFactory.java:80)
at
org.netbeans.lib.profiler.heap.HeapFactory.createHeap(HeapFactory.java:49)
{code}
I am able to generate the file with a single heap segment (see
[^singleheapsegment.hprof]) as well as multiple heap segments (see
[^multiheapsegment.hprof]). The first one can be opened by NetBeans 12.x, the
latter cannot.
In my usecase I'd like to generate the file incrementally while my application
is running. As such it is essential to flush the heap segments multiple times,
otherwise I may run out of memory. It would be fantastic if the NetBeans heap
profiler library could be enhanced to work with multiheapsegment files properly.
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