JDI:如何在HashMap上迭代

Question

我通过JDI获得com.sun.jdi.ObjectReference是java.util.HashMap类型，然后得到文件值"entrySet“，为什么它总是为null？如何使用java调试api在HashMap keyValues上迭代？

public static void displayVariables(LocatableEvent event) throws IncompatibleThreadStateException, AbsentInformationException {
        StackFrame stackFrame = event.thread().frame(0);
        for (LocalVariable visibleVariable : stackFrame.visibleVariables()) {
            Value value = stackFrame.getValue(visibleVariable);
            if(value instanceof ObjectReference){
                ObjectReference objectReference = (ObjectReference) value;//is type java.util.HashMap
                Field entrySet = objectReference.referenceType().fieldByName("entrySet");// is java.util.HashMap.entrySet
                Value entrySetValue = objectReference.getValue(entrySet);// is null
                System.out.println(entrySet);

            }
        }
    }

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Answer 1

for (T key : hashMap.keySet()) {
    V value = hashMap.get(key);
    // rest of your code here
} // Can you get to where you need to go from here?

假设hashMap是HashMap。

Answer 2

mapConfig.forEach((k, v) -> {

});