JsonPath 在多个线程中返回错误的值

Question

我做了下面的示例代码来检查 JsonPath 版本 2.9.0 线程安全与否，我意识到它不安全。 这是 JsonPath 的问题还是有什么办法解决它？或者有什么替代解决方案？请帮忙

@Test
  public void testJsonPath() throws IOException {

    String jsonString = "{\"test\":1,\"person\":{\"name\":\"John\",\"age\":50}}";
    String jsonString2 ="{\"test\":1,\"person\":{\"name\":\"Babara\",\"age\":48}}";
    Thread thread1 = new Thread(createRunnable(jsonString));
    Thread thread2 = new Thread(createRunnable(jsonString2));
    thread1.start();
    thread2.start();
    try {
      thread1.join();
      thread2.join();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
  }

  private Runnable createRunnable(String json) {
    return () -> {
      int count = 10;
      try {
        while (count > 0) {
          count--;
          Thread.sleep(1000);
          String value = JsonPath.read(json, "concat($.person.name, $.person.age)");
          if (value.equals("John48") || value.equals("Babara50")) {
            System.out.println("Wrong value returned: " + value);
          }
          System.out.printf("Thread-[%d], Value: [%s]%n", Thread.currentThread().getId(), value);

        }
      } catch (Exception e) {
        e.printStackTrace();
      }
    };
  }

结果显示JsonPath返回错误值，如：Babara50，John48

Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [**Babara50**]
Thread-[31], Value: [**John48**]
Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [**Babara50**]
Thread-[30], Value: [John50]
Thread-[31], Value: [**John48**]
Thread-[31], Value: [**John48**]
Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [John50]
Thread-[31], Value: [Babara48]
Thread-[30], Value: [John50]

Answer 1

jayway

JsonPath 实现使用在调用

JsonPath.read

时维护的缓存。

您可以通过设置一个永远找不到任何东西的虚拟缓存来禁用缓存：

CacheProvider.setCache(new Cache() {
            @Override
            public JsonPath get(String key) {
                return null;
            }

            @Override
            public void put(String key, JsonPath value) {

            }
        });