I find required objects in visualvm
v1.3.8:
filter(heap.objects("java.lang.String"), "/hibernate\\.ejb\\.naming/(it.toString())")
they shown as:
java.lang.String#32669 - hibernate.ejb.naming_strategy_delegator
java.lang.String#34021 - hibernate.ejb.naming_strategy
java.lang.String#39522 - hibernate.ejb.naming_strategy_delegator
How can I refer to individual object from result set in OQL syntax? My attempts fail:
select heap.findObject("java.lang.String#34021")
select heap.findObject("#34021")
select heap.findObject("34021")
I may use trick with objectid(...)
:
map(filter(heap.objects("java.lang.String"),
"/hibernate\\.ejb\\.naming/.test(it.toString())"),
"{id: objectid(it), ref: it}")
and then reuse id with heap.findObject(4077522088)
like syntax.
UPDATE 2022 Seems VisualVM enumerates each type separately and consistently so iteration of heap.objects("...", false)
should lead to the right object:
function objectnum(clazz, num) {
if (typeof clazz !== 'string') { return undefined; }
if (Math.floor(num) !== num) {
var split = clazz.split("#");
if (split.length != 2) { return undefined; }
clazz = split[0];
num = parseInt(split[1]);
}
if (num < 1) { return undefined; }
var iter = heap.objects(clazz, false);
var i = 0;
while (iter.hasMoreElements()) {
i += 1;
var next = iter.nextElement();
if (num === i) { return next; }
}
return null;
}
// Usage:
objectnum("byte[]#123");
objectnum("char[]", 456);
objectnum("java.lang.String#789");