这是Java8 Collectors.toMap（）中的错误吗？ VALUE上引发的“重复键”不是键，也不是重复键

时间：2018-11-29 17:51:10

标签： java collections

MCVE

最小，完整，可验证的示例：

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.junit.Assert;
import org.junit.Test;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class VmWareDATest {

    protected static Map<String, String> map(List<Map<String, Object>> rs) {
        return rs.stream().collect(
            Collectors.toMap(row -> {
                String vm = (String) row.get("VM");
                return vm;
            }, row -> {
                String ip = (String) row.get("IP_Address");
                return ip;
            }));
    }

    @Test
    public void test() throws JsonParseException, JsonMappingException, IOException {

        String json = "[{\"VM\":\"b3450b8b\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"c13186c6\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"7b0f8649\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"fbdaa605\",\"IP_Address\":\"38e2b78e\"},{\"VM\":\"77f33ea3\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"dbadd6af\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"5e974088\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"3a741969\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"81c8feaa\",\"IP_Address\":\"2659f080\"},{\"VM\":\"ab90ac49\",\"IP_Address\":\"3a30babf\"},{\"VM\":\"234517c0\",\"IP_Address\":\"0942c9cf\"},{\"VM\":\"3f3c147d\",\"IP_Address\":\"572bb581\"},{\"VM\":\"9a274668\",\"IP_Address\":\"f500bdf7\"},{\"VM\":\"20ab2d90\",\"IP_Address\":\"141ebc5e\"},{\"VM\":\"3e7f77a7\",\"IP_Address\":\"8b8e121f\"},{\"VM\":\"81b04527\",\"IP_Address\":\"331d78ad\"},{\"VM\":\"8cc3aa96\",\"IP_Address\":\"a93d959c\"},{\"VM\":\"9acb2e94\",\"IP_Address\":\"3aa12ee4\"},{\"VM\":\"34e573c8\",\"IP_Address\":\"48ac5a5d\"},{\"VM\":\"6c829b6b\",\"IP_Address\":\"ded08923\"},{\"VM\":\"f09950f7\",\"IP_Address\":\"8167af24\"},{\"VM\":\"bca20fe8\",\"IP_Address\":\"852bd153\"},{\"VM\":\"3892de0a\",\"IP_Address\":\"7b585a39\"},{\"VM\":\"9f4c6167\",\"IP_Address\":\"6ff214de\"},{\"VM\":\"8f1bb042\",\"IP_Address\":\"53861c95\"},{\"VM\":\"ff14ba42\",\"IP_Address\":\"2f3aace4\"},{\"VM\":\"30a9175a\",\"IP_Address\":\"73191ccb\"},{\"VM\":\"def78807\",\"IP_Address\":\"8615a0d3\"},{\"VM\":\"12dca667\",\"IP_Address\":\"18e25345\"},{\"VM\":\"d6aef3db\",\"IP_Address\":\"1f83c563\"},{\"VM\":\"394b3c97\",\"IP_Address\":\"18ae1753\"},{\"VM\":\"1be8724e\",\"IP_Address\":\"35fd5d78\"},{\"VM\":\"9a1ee5e0\",\"IP_Address\":\"d77825fa\"},{\"VM\":\"f23eb99a\",\"IP_Address\":\"4846d1b2\"},{\"VM\":\"1e3959ff\",\"IP_Address\":\"f8245174\"},{\"VM\":\"c554fb8d\",\"IP_Address\":\"bfec0612\"},{\"VM\":\"0919ed8c\",\"IP_Address\":\"6244d931\"},{\"VM\":\"0460e31c\",\"IP_Address\":\"d7888f20\"},{\"VM\":\"231e50e4\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"ab8dc5fc\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"662918b2\",\"IP_Address\":\"34105491\"},{\"VM\":\"662918b2\",\"IP_Address\":\"da4376d0\"},{\"VM\":\"c834b346\",\"IP_Address\":\"ea478b03\"},{\"VM\":\"c834b346\",\"IP_Address\":\"e4006000\"},{\"VM\":\"29b7dad5\",\"IP_Address\":\"0feb5efc\"},{\"VM\":\"054d0913\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"a7b09acc\",\"IP_Address\":\"e00c33fe\"},{\"VM\":\"4345aa66\",\"IP_Address\":\"53cf6df3\"},{\"VM\":\"cbc285e3\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"f0b33ea1\",\"IP_Address\":\"70ef09f1\"},{\"VM\":\"93eac97e\",\"IP_Address\":\"bd42cbc2\"},{\"VM\":\"a63ccdca\",\"IP_Address\":\"ff11b407\"},{\"VM\":\"c3ae892a\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"947532ba\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"947532ba\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"947532ba\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"947532ba\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"947532ba\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"067217ce\",\"IP_Address\":\"730b6cad\"},{\"VM\":\"c45391dd\",\"IP_Address\":\"f4688fc5\"},{\"VM\":\"59f2af8b\",\"IP_Address\":\"26da747a\"},{\"VM\":\"2ecee04e\",\"IP_Address\":\"c4e942eb\"},{\"VM\":\"7d2003e7\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"8ea9835a\",\"IP_Address\":\"1eb2af24\"},{\"VM\":\"2b0ed228\",\"IP_Address\":\"3411ec52\"},{\"VM\":\"3ec690d7\",\"IP_Address\":\"0d24537b\"},{\"VM\":\"86d9a891\",\"IP_Address\":\"25c74a62\"},{\"VM\":\"fa0061b1\",\"IP_Address\":\"2b47d220\"},{\"VM\":\"424e0f9a\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"3e111984\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"0565c9ce\",\"IP_Address\":\"6316d8af\"},{\"VM\":\"b569fad1\",\"IP_Address\":\"062e5d70\"},{\"VM\":\"53e869cb\",\"IP_Address\":\"da72fff0\"},{\"VM\":\"3a54a26a\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"bf2fb723\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"56443b93\",\"IP_Address\":\"0a18ae50\"},{\"VM\":\"ac679691\",\"IP_Address\":\"bfa18c40\"},{\"VM\":\"b95a4f9a\",\"IP_Address\":\"3e76c661\"},{\"VM\":\"8e090e8b\",\"IP_Address\":\"b2a20625\"},{\"VM\":\"78621fe9\",\"IP_Address\":\"01c17a59\"},{\"VM\":\"b3957559\",\"IP_Address\":\"8e7f9a98\"},{\"VM\":\"e3c90214\",\"IP_Address\":\"4cbe7221\"},{\"VM\":\"f23ef948\",\"IP_Address\":\"8bf16c74\"},{\"VM\":\"d323103d\",\"IP_Address\":\"a71b5a9d\"},{\"VM\":\"15935332\",\"IP_Address\":\"9ee759a0\"},{\"VM\":\"57acb572\",\"IP_Address\":\"9e5f2a55\"},{\"VM\":\"aa572542\",\"IP_Address\":\"ed7fc986\"},{\"VM\":\"6f7656c9\",\"IP_Address\":\"5c615a7e\"},{\"VM\":\"60f73bfc\",\"IP_Address\":\"8bffe0d3\"},{\"VM\":\"9137a080\",\"IP_Address\":\"847873b7\"},{\"VM\":\"9b16202c\",\"IP_Address\":\"ab3d3c7a\"},{\"VM\":\"549f20c7\",\"IP_Address\":\"2350c036\"},{\"VM\":\"b21359ce\",\"IP_Address\":\"5eaf9389\"},{\"VM\":\"b2961065\",\"IP_Address\":\"e911cd61\"},{\"VM\":\"8f5381f0\",\"IP_Address\":\"c1b0d2ed\"},{\"VM\":\"e0dbfc44\",\"IP_Address\":\"e73ab276\"},{\"VM\":\"4bf88df7\",\"IP_Address\":\"82c8c32d\"},{\"VM\":\"728f9f74\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"7243420e\",\"IP_Address\":\"b6940789\"},{\"VM\":\"443e5f3c\",\"IP_Address\":\"878ffb6b\"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},{\"VM\":\"1cd1ab7c\",\"IP_Address\":\"65f04541\"},{\"VM\":\"d30bcb2f\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"7af27d93\",\"IP_Address\":\"379473f1\"},{\"VM\":\"6271e3c5\",\"IP_Address\":\"ff682eb4\"},{\"VM\":\"0fd8b355\",\"IP_Address\":\"94521920\"},{\"VM\":\"f66165b2\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"631707c9\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"4dc7d36d\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"138d3a9e\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"6c278906\",\"IP_Address\":\"690e45b7\"},{\"VM\":\"0bf4375e\",\"IP_Address\":\"622f7b6d\"},{\"VM\":\"9044b3b4\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"8e6b1740\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"8f7bd54e\",\"IP_Address\":\"8eb77c58\"},{\"VM\":\"5d23705d\",\"IP_Address\":\"13a9bf66\"},{\"VM\":\"ffe23512\",\"IP_Address\":\"e58f1c86\"},{\"VM\":\"23671f65\",\"IP_Address\":\"a8280e36\"},{\"VM\":\"8ec8a596\",\"IP_Address\":\"d4beff10\"},{\"VM\":\"162cb4c2\",\"IP_Address\":\"7d2284db\"},{\"VM\":\"674236b7\",\"IP_Address\":\"a12ea648\"},{\"VM\":\"ea430f9d\",\"IP_Address\":\"3b621684\"},{\"VM\":\"9e82384e\",\"IP_Address\":\"4d0c77a9\"},{\"VM\":\"dfef47ae\",\"IP_Address\":\"466091a6\"},{\"VM\":\"13f4cc2e\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"7ec4a547\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"fb8e8af2\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"7866cb8c\",\"IP_Address\":\"63a4eb4d\"},{\"VM\":\"e4733a66\",\"IP_Address\":\"ab1c58c4\"},{\"VM\":\"14608c59\",\"IP_Address\":\"943a160d\"},{\"VM\":\"94eebafc\",\"IP_Address\":\"f2773eac\"},{\"VM\":\"ea7c0078\",\"IP_Address\":\"b21f8665\"},{\"VM\":\"e1fbe76a\",\"IP_Address\":\"c6bf3067\"},{\"VM\":\"2dc0271e\",\"IP_Address\":\"6f6f71e4\"},{\"VM\":\"1770412d\",\"IP_Address\":\"7f95b86b\"},{\"VM\":\"e4b80f93\",\"IP_Address\":\"36ccbdc7\"},{\"VM\":\"344287fb\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"29ca5f06\",\"IP_Address\":\"c3dc5f2d\"},{\"VM\":\"192e1deb\",\"IP_Address\":\"e6df9ceb\"},{\"VM\":\"b663f902\",\"IP_Address\":\"8e6d92d5\"},{\"VM\":\"7b98bbcf\",\"IP_Address\":\"c8c6dc23\"},{\"VM\":\"d19cd928\",\"IP_Address\":\"5e218904\"},{\"VM\":\"375412d8\",\"IP_Address\":\"9ace79e0\"},{\"VM\":\"08fcffd2\",\"IP_Address\":\"5852c862\"},{\"VM\":\"b69702d4\",\"IP_Address\":\"b9a48aae\"},{\"VM\":\"31ce4787\",\"IP_Address\":\"aefc67dd\"},{\"VM\":\"337bac8c\",\"IP_Address\":\"f9ccb183\"},{\"VM\":\"c2faa7e5\",\"IP_Address\":\"ff59747f\"},{\"VM\":\"4887582c\",\"IP_Address\":\"93942212\"},{\"VM\":\"2f87e8f8\",\"IP_Address\":\"81c7ba5c\"},{\"VM\":\"36d3e825\",\"IP_Address\":\"5a3693d8\"},{\"VM\":\"d3372f5b\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"4acac31f\",\"IP_Address\":\"d435ca3d\"},{\"VM\":\"4acac31f\",\"IP_Address\":\"c42f1111\"},{\"VM\":\"bf4a4885\",\"IP_Address\":\"7ff1307e\"},{\"VM\":\"79324e02\",\"IP_Address\":\"1d36a351\"},{\"VM\":\"24cae19f\",\"IP_Address\":\"48eb3d27\"},{\"VM\":\"74b5a16c\",\"IP_Address\":\"f8b167a5\"},{\"VM\":\"e26f7f4d\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"b426ef14\",\"IP_Address\":\"55625f8b\"},{\"VM\":\"299dc386\",\"IP_Address\":\"2060b924\"},{\"VM\":\"c68b81ca\",\"IP_Address\":\"b9f55bd7\"},{\"VM\":\"cbfef506\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"187c7214\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"9e624f78\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"f0441aaf\",\"IP_Address\":\"50d8b4a9\"},{\"VM\":\"710caffd\",\"IP_Address\":\"6e8dbe73\"},{\"VM\":\"63b2aaa1\",\"IP_Address\":\"2fb4a04a\"},{\"VM\":\"557e4656\",\"IP_Address\":\"695e8898\"},{\"VM\":\"9f2de80a\",\"IP_Address\":\"dbb225a8\"},{\"VM\":\"46553fb8\",\"IP_Address\":\"985171d5\"},{\"VM\":\"b5fb8857\",\"IP_Address\":\"e524b743\"},{\"VM\":\"18b9ed3e\",\"IP_Address\":\"997f5d91\"},{\"VM\":\"bfa06344\",\"IP_Address\":\"886409eb\"},{\"VM\":\"3cc53d94\",\"IP_Address\":\"d2496105\"},{\"VM\":\"57b3960c\",\"IP_Address\":\"19992ec6\"},{\"VM\":\"f9e0ef14\",\"IP_Address\":\"b7b85d58\"},{\"VM\":\"6607ce65\",\"IP_Address\":\"a7a43e4b\"},{\"VM\":\"a29144de\",\"IP_Address\":\"8d902600\"},{\"VM\":\"a2fb6bfc\",\"IP_Address\":\"d2acb3c7\"},{\"VM\":\"8638af0f\",\"IP_Address\":\"aba9e3f7\"},{\"VM\":\"3eaee27c\",\"IP_Address\":\"4fae8c66\"},{\"VM\":\"393bb7bf\",\"IP_Address\":\"3b85781e\"},{\"VM\":\"c0a94dbb\",\"IP_Address\":\"094e2b94\"},{\"VM\":\"3ae9bc4a\",\"IP_Address\":\"c4954810\"},{\"VM\":\"892b6387\",\"IP_Address\":\"11377e7f\"},{\"VM\":\"8b1cb09d\",\"IP_Address\":\"5531cd4d\"},{\"VM\":\"08620d1f\",\"IP_Address\":\"b5abe922\"},{\"VM\":\"2f577691\",\"IP_Address\":\"635ce442\"},{\"VM\":\"41e2272d\",\"IP_Address\":\"1371da01\"},{\"VM\":\"36b4fa6a\",\"IP_Address\":\"638865c9\"},{\"VM\":\"428159f7\",\"IP_Address\":\"812b9d8c\"},{\"VM\":\"a7979965\",\"IP_Address\":\"f0573dbc\"},{\"VM\":\"6c88d795\",\"IP_Address\":\"29772660\"},{\"VM\":\"741c8e79\",\"IP_Address\":\"f0023d08\"},{\"VM\":\"06adfe73\",\"IP_Address\":\"0a62cb71\"},{\"VM\":\"c5adc5e9\",\"IP_Address\":\"1ea0d463\"},{\"VM\":\"44898b77\",\"IP_Address\":\"0f8bd31a\"},{\"VM\":\"9ac66987\",\"IP_Address\":\"402e2ea1\"},{\"VM\":\"fbcc2673\",\"IP_Address\":\"cd4020ed\"},{\"VM\":\"0bbff5b2\",\"IP_Address\":\"5c4b99a9\"},{\"VM\":\"e2e0d58c\",\"IP_Address\":\"83a402e3\"},{\"VM\":\"d3e416e7\",\"IP_Address\":\"580115ab\"},{\"VM\":\"d55a056a\",\"IP_Address\":\"fbb71162\"},{\"VM\":\"59ca1483\",\"IP_Address\":\"c16a5a15\"}]";

        ObjectMapper objectMapper = new ObjectMapper();
        List<Map<String,Object>> readValue = objectMapper.readValue(json, new TypeReference<List<Map<String, Object>>>(){});

        Map<String, String> map = map(readValue);

        Assert.assertTrue(map.containsKey("b3450b8b"));
        Assert.assertTrue(map.containsValue("50d8b4a9"));
    }

}

输出：

java.lang.IllegalStateException: Duplicate key 34105491
    at java.util.stream.Collectors.lambda$throwingMerger$0(Unknown Source)
    at java.util.HashMap.merge(Unknown Source)
    at java.util.stream.Collectors.lambda$toMap$58(Unknown Source)
    at java.util.stream.ReduceOps$3ReducingSink.accept(Unknown Source)
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
    at java.util.stream.AbstractPipeline.copyInto(Unknown Source)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
    at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(Unknown Source)
    at java.util.stream.AbstractPipeline.evaluate(Unknown Source)
    at java.util.stream.ReferencePipeline.collect(Unknown Source)
    at com.stackoverflow.mcve.dao.VmWareDATest.map(VmWareDATest.java:19)
    at com.stackoverflow.mcve.dao.VmWareDATest.test(VmWareDATest.java:37)

为什么会这样？

请注意两个重要事实：

  1. 值34105491不是键
  2. 值34105491不是重复的

为什么将其标记为重复密钥？！

预期产量

测试应该通过。

0 个答案:

没有答案
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