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https://issues.apache.org/jira/browse/NETBEANS-4618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17163193#comment-17163193
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Jaroslav Tulach commented on NETBEANS-4618:
-------------------------------------------
The root cause of the exception is the {{TagBounds[] tagBounds = new
TagBounds[0xff];}} array which assumes that each segment appears there only
one. When multiple heap dump segments (id {{0x1C}}) are present, the
{{tagBound.start}} is set to beginning of the first segment, but the
{{tagBound.end}} is set to the end of the last segment. The {{readDumpTag}}
code then tries to process everything from start to end and gets confused by
other, non-heap data in between. In the particular case of
[^multiheapsegment.hprof] a definition of {{STACK_FRAME}} is treated as
{{ROOT_NATIVE_STACK}} and then an exception is thrown.
> 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
> Priority: Major
> 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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