Java thread dump: BLOCKED thread without “waiting to lock …”

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Apparently the situation where we observed these kinds of blocked threads were related to heavy memory consumption and therefore massive garbage collection.

This question Java blocking issue: Why would JVM block threads in many different classes/methods? describes a similar situation, so I believe these threads were simply blocked by the garbage collector.

(Anyway, after solving the memory issue this problem with the blocking threads was gone.)

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